{"transactions":[{"id":3039317,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":4,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":5,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":6,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":7,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, par value $0.00001","published_at":"2020-09-03T16:17:39.000Z","date":"2020-09-01","kind":"other","acquired":false,"shares":68817,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Viex Opportunities Fund, LP - Series One"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents a distribution of shares of the Issuer from Series One to a limited partner of Series One."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Securities of the Issuer beneficially owned directly by Series One. VIEX GP, as the general partner of Series One, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One. VIEX Capital, as the investment manager of Series One, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One."}],"balance_after":1465781,"source":{"system":"sec-edgar","filing":"0001580808-20-000091","document":"wf-form4_159916424208980.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000158080820000091/wf-form4_159916424208980.xml","form_type":"4"}},{"id":3067515,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":4,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":5,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":6,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":7,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, par value $0.00001","published_at":"2020-08-05T16:12:48.000Z","date":"2020-08-03","kind":"other","acquired":false,"shares":123762,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Viex Opportunities Fund, LP - Series One"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Represents a distribution of shares of the Issuer from Series One to a limited partner of Series One for no consideration."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Mr. Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Securities of the Issuer beneficially owned directly by Series One. VIEX GP, as the general partner of Series One, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One. VIEX Capital, as the investment manager of Series One, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":1534598,"source":{"system":"sec-edgar","filing":"0001580808-20-000087","document":"wf-form4_159665835222629.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000158080820000087/wf-form4_159665835222629.xml","form_type":"4"}},{"id":3344471,"issuer":{"id":4987,"kind":"organization","name":"QUANTUM CORP /DE/","symbol":"QMCO"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"See Explanation of Responses"}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":4,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":5,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":6,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":7,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}}],"security":"Common Stock, par value $0.001","published_at":"2019-12-13T01:04:30.000Z","date":"2019-12-10","kind":"sale","acquired":false,"shares":252469,"price":5.775,"value":1458008.475,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund III, LP"},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"security","element":"securityTitle","label":"F2","text":"As of the close of business on December 10, 2019, the Reporting Persons ceased to be holders of an aggregate of 10% or more of Quantum Corporation's (the \"Issuer\") outstanding shares of Common Stock. Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"Securities of the Issuer beneficially owned directly by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III."}],"balance_after":2336364,"source":{"system":"sec-edgar","filing":"0000921895-19-002984","document":"form410114016_12122019.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/709283/000092189519002984/form410114016_12122019.xml","form_type":"4"}},{"id":3344470,"issuer":{"id":4987,"kind":"organization","name":"QUANTUM CORP /DE/","symbol":"QMCO"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"See Explanation of Responses"}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":4,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":5,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":6,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":7,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}}],"security":"Common Stock, par value $0.001","published_at":"2019-12-13T01:04:30.000Z","date":"2019-12-10","kind":"sale","acquired":false,"shares":17227,"price":5.775,"value":99485.925,"ownership":{"direct":false,"nature":"By Viex Opportunities Fund, LP - Series Two"},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"security","element":"securityTitle","label":"F2","text":"As of the close of business on December 10, 2019, the Reporting Persons ceased to be holders of an aggregate of 10% or more of Quantum Corporation's (the \"Issuer\") outstanding shares of Common Stock. Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Securities of the Issuer beneficially owned directly by Series Two. VIEX GP, as the general partner of Series Two, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two. VIEX Capital, as the investment manager of Series Two, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two."}],"balance_after":159421,"source":{"system":"sec-edgar","filing":"0000921895-19-002984","document":"form410114016_12122019.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/709283/000092189519002984/form410114016_12122019.xml","form_type":"4"}},{"id":3344469,"issuer":{"id":4987,"kind":"organization","name":"QUANTUM CORP /DE/","symbol":"QMCO"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"See Explanation of Responses"}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":4,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":5,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":6,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":7,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}}],"security":"Common Stock, par value $0.001","published_at":"2019-12-13T01:04:30.000Z","date":"2019-12-10","kind":"sale","acquired":false,"shares":90304,"price":5.775,"value":521505.6,"ownership":{"direct":false,"nature":"By Viex Opportunities Fund, LP - Series One"},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"security","element":"securityTitle","label":"F2","text":"As of the close of business on December 10, 2019, the Reporting Persons ceased to be holders of an aggregate of 10% or more of Quantum Corporation's (the \"Issuer\") outstanding shares of Common Stock. Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Securities of the Issuer beneficially owned directly by Series One. VIEX GP, as the general partner of Series One, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One. VIEX Capital, as the investment manager of Series One, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One."}],"balance_after":835679,"source":{"system":"sec-edgar","filing":"0000921895-19-002984","document":"form410114016_12122019.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/709283/000092189519002984/form410114016_12122019.xml","form_type":"4"}},{"id":3368337,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Call Option (Right to Buy)","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-15","kind":"other","acquired":false,"shares":1509,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Viex Opportunities Fund, LP - Series Two"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F9","text":"Shares of Common Stock of the Issuer beneficially owned directly by Series Two or options sold by Series Two. The transaction reported herein represents the exercise on November 15, 2019 of 1,509 call option contracts sold by Series Two, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by Series Two. VIEX GP, as the general partner of Series Two, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by Series Two. VIEX Capital, as the investment manager of Series Two, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by Series Two. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by Series Two."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F12","text":"These options were exercisable when exercised."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Securities of the Issuer beneficially owned directly by Series Two. VIEX GP, as the general partner of Series Two, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two. VIEX Capital, as the investment manager of Series Two, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two."}],"balance_after":0,"derivative":{"exercise_price":2.5,"expiration_date":"2019-11-15","underlying":"Common Stock, par value $0.00001","underlying_shares":150900},"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":16,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3368336,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Call Option (Right to Buy)","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-15","kind":"other","acquired":false,"shares":58,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund III, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"Shares of Common Stock of the Issuer beneficially owned directly by VSO III or options sold by VSO III. The transactions reported herein represent the exercises on November 15, 2019 of (i) 2,105 call option contracts sold by VSO III, and (ii) 58 call option contracts sold by VSO III, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F12","text":"These options were exercisable when exercised."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"Securities of the Issuer beneficially owned directly by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III."}],"balance_after":0,"derivative":{"exercise_price":5,"expiration_date":"2019-11-15","underlying":"Common Stock, par value $0.00001","underlying_shares":5800},"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":15,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3368335,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Call Option (Right to Buy)","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-15","kind":"other","acquired":false,"shares":2105,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund III, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"Shares of Common Stock of the Issuer beneficially owned directly by VSO III or options sold by VSO III. The transactions reported herein represent the exercises on November 15, 2019 of (i) 2,105 call option contracts sold by VSO III, and (ii) 58 call option contracts sold by VSO III, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F12","text":"These options were exercisable when exercised."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"Securities of the Issuer beneficially owned directly by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III."}],"balance_after":0,"derivative":{"exercise_price":2.5,"expiration_date":"2019-11-15","underlying":"Common Stock, par value $0.00001","underlying_shares":210500},"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3368334,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Call Option (Right to Buy)","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-15","kind":"other","acquired":false,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F6","text":"Shares of Common Stock of the Issuer beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises on November 15, 2019 of (i) 1,500 call option contracts sold by VSO II, and (ii) 59 call option contracts sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F12","text":"These options were exercisable when exercised."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":0,"derivative":{"exercise_price":2.5,"expiration_date":"2019-11-15","underlying":"Common Stock, par value $0.00001","underlying_shares":150000},"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3368333,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Call Option (Right to Buy)","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-15","kind":"other","acquired":false,"shares":59,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F6","text":"Shares of Common Stock of the Issuer beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises on November 15, 2019 of (i) 1,500 call option contracts sold by VSO II, and (ii) 59 call option contracts sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F12","text":"These options were exercisable when exercised."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":0,"derivative":{"exercise_price":5,"expiration_date":"2019-11-15","underlying":"Common Stock, par value $0.00001","underlying_shares":5900},"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3368332,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Put Option (Obligation to Buy)","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-15","kind":"other","acquired":false,"shares":1328,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"Shares of Common Stock of the Issuer beneficially owned directly by VSO II or options sold by VSO II. The transaction reported herein represent the exercise of 1,328 put option contracts on November 15, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F12","text":"These options were exercisable when exercised."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":0,"derivative":{"exercise_price":7.5,"expiration_date":"2019-11-15","underlying":"Common Stock, par value $0.00001","underlying_shares":132800},"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3368331,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Put Option (Obligation to Buy)","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-14","kind":"other","acquired":false,"shares":672,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares of Common Stock of A10 Networks, Inc. (the \"Issuer\") beneficially owned directly by VSO II or options sold by VSO II. The transaction reported herein represent the exercise of 672 put option contracts on November 14, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F12","text":"These options were exercisable when exercised."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":1328,"derivative":{"exercise_price":7.5,"expiration_date":"2019-11-15","underlying":"Common Stock, par value $0.00001","underlying_shares":67200},"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3368330,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.00001","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-15","kind":"other","acquired":true,"shares":150900,"price":2.5,"value":377250.0,"ownership":{"direct":false,"nature":"By Viex Opportunities Fund, LP - Series Two"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F9","text":"Shares of Common Stock of the Issuer beneficially owned directly by Series Two or options sold by Series Two. The transaction reported herein represents the exercise on November 15, 2019 of 1,509 call option contracts sold by Series Two, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by Series Two. VIEX GP, as the general partner of Series Two, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by Series Two. VIEX Capital, as the investment manager of Series Two, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by Series Two. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by Series Two."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Securities of the Issuer beneficially owned directly by Series Two. VIEX GP, as the general partner of Series Two, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two. VIEX Capital, as the investment manager of Series Two, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two."}],"balance_after":482877,"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3368329,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.00001","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-15","kind":"other","acquired":true,"shares":210500,"price":2.5,"value":526250.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund III, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"Shares of Common Stock of the Issuer beneficially owned directly by VSO III or options sold by VSO III. The transactions reported herein represent the exercises on November 15, 2019 of (i) 2,105 call option contracts sold by VSO III, and (ii) 58 call option contracts sold by VSO III, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"Securities of the Issuer beneficially owned directly by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III."}],"balance_after":487416,"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3368328,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.0000","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-15","kind":"other","acquired":true,"shares":5800,"price":5,"value":29000.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund III, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"Shares of Common Stock of the Issuer beneficially owned directly by VSO III or options sold by VSO III. The transactions reported herein represent the exercises on November 15, 2019 of (i) 2,105 call option contracts sold by VSO III, and (ii) 58 call option contracts sold by VSO III, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."}],"balance_after":276916,"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3368327,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.00001","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-15","kind":"other","acquired":true,"shares":150000,"price":2.5,"value":375000.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F6","text":"Shares of Common Stock of the Issuer beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises on November 15, 2019 of (i) 1,500 call option contracts sold by VSO II, and (ii) 59 call option contracts sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":5255022,"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3368326,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.00001","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-15","kind":"other","acquired":true,"shares":5900,"price":5,"value":29500.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F6","text":"Shares of Common Stock of the Issuer beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises on November 15, 2019 of (i) 1,500 call option contracts sold by VSO II, and (ii) 59 call option contracts sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":5105022,"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3368325,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.00001","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-15","kind":"other","acquired":true,"shares":132800,"price":7.5,"value":996000.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"Shares of Common Stock of the Issuer beneficially owned directly by VSO II or options sold by VSO II. The transaction reported herein represent the exercise of 1,328 put option contracts on November 15, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":5099122,"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3368324,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.00001","published_at":"2019-11-18T16:27:25.000Z","date":"2019-11-14","kind":"other","acquired":true,"shares":67200,"price":7.5,"value":504000.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares of Common Stock of A10 Networks, Inc. (the \"Issuer\") beneficially owned directly by VSO II or options sold by VSO II. The transaction reported herein represent the exercise of 672 put option contracts on November 14, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":4966322,"source":{"system":"sec-edgar","filing":"0001209191-19-056945","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119056945/doc4.xml","form_type":"4"}},{"id":3434584,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Put Option (Obligation to Buy)","published_at":"2019-08-19T17:31:25.000Z","date":"2019-08-16","kind":"other","acquired":false,"shares":1117,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F9","text":"Put options expired on August 16, 2019."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F9","text":"Put options expired on August 16, 2019."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":0,"derivative":{"exercise_price":5,"expiration_date":"2019-08-16","underlying":"Common Stock, par value $0.00001","underlying_shares":111700},"source":{"system":"sec-edgar","filing":"0001209191-19-046654","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119046654/doc4.xml","form_type":"4"}},{"id":3434583,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Put Option (Obligation to Buy)","published_at":"2019-08-19T17:31:25.000Z","date":"2019-08-16","kind":"other","acquired":false,"shares":11048,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares of Common Stock of A10 Networks, Inc. (the \"Issuer\") beneficially owned directly by VSO II or options sold by VSO II. The transaction reported herein represent the exercise of 11,048 put option contracts on August 16, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"These options are currently exercisable."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":0,"derivative":{"exercise_price":7.5,"expiration_date":"2019-08-16","underlying":"Common Stock, par value $0.00001","underlying_shares":1104800},"source":{"system":"sec-edgar","filing":"0001209191-19-046654","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119046654/doc4.xml","form_type":"4"}},{"id":3434582,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.00001","published_at":"2019-08-19T17:31:25.000Z","date":"2019-08-16","kind":"other","acquired":true,"shares":1104800,"price":7.5,"value":8286000.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares of Common Stock of A10 Networks, Inc. (the \"Issuer\") beneficially owned directly by VSO II or options sold by VSO II. The transaction reported herein represent the exercise of 11,048 put option contracts on August 16, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":4899122,"source":{"system":"sec-edgar","filing":"0001209191-19-046654","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119046654/doc4.xml","form_type":"4"}},{"id":3436214,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Put Option (Obligation to Buy)","published_at":"2019-08-16T18:10:11.000Z","date":"2019-08-15","kind":"other","acquired":false,"shares":2179,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares of Common Stock of A10 Networks, Inc. (the \"Issuer\") beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises of (i) 452 put option contracts on August 14, 2019 and (ii) 2,179 put option contracts on August 15, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"These options are currently exercisable."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":11048,"derivative":{"exercise_price":7.5,"expiration_date":"2019-08-16","underlying":"Common Stock, par value $0.00001","underlying_shares":217900},"source":{"system":"sec-edgar","filing":"0001209191-19-046403","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119046403/doc4.xml","form_type":"4"}},{"id":3436213,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Put Option (Obligation to Buy)","published_at":"2019-08-16T18:10:11.000Z","date":"2019-08-14","kind":"other","acquired":false,"shares":452,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares of Common Stock of A10 Networks, Inc. (the \"Issuer\") beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises of (i) 452 put option contracts on August 14, 2019 and (ii) 2,179 put option contracts on August 15, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"These options are currently exercisable."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":13227,"derivative":{"exercise_price":7.5,"expiration_date":"2019-08-16","underlying":"Common Stock, par value $0.00001","underlying_shares":45200},"source":{"system":"sec-edgar","filing":"0001209191-19-046403","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119046403/doc4.xml","form_type":"4"}},{"id":3436212,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.00001","published_at":"2019-08-16T18:10:11.000Z","date":"2019-08-15","kind":"other","acquired":true,"shares":217900,"price":7.5,"value":1634250.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares of Common Stock of A10 Networks, Inc. (the \"Issuer\") beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises of (i) 452 put option contracts on August 14, 2019 and (ii) 2,179 put option contracts on August 15, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":3794322,"source":{"system":"sec-edgar","filing":"0001209191-19-046403","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119046403/doc4.xml","form_type":"4"}},{"id":3436211,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":4,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":5,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":6,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":7,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.00001","published_at":"2019-08-16T18:10:11.000Z","date":"2019-08-14","kind":"other","acquired":true,"shares":45200,"price":7.5,"value":339000.0,"ownership":{"direct":false,"nature":"By Viex Special Opportunities Fund II, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares of Common Stock of A10 Networks, Inc. (the \"Issuer\") beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises of (i) 452 put option contracts on August 14, 2019 and (ii) 2,179 put option contracts on August 15, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose."}],"balance_after":3576422,"source":{"system":"sec-edgar","filing":"0001209191-19-046403","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000120919119046403/doc4.xml","form_type":"4"}},{"id":3453272,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP - Series Two","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":132857,"kind":"organization","name":"VIEX Special Opportunities Fund II, LP","position":4,"cik":"0001619127","reported_name":"VIEX Special Opportunities Fund II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":5,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":6,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":141446,"kind":"organization","name":"VIEX Special Opportunities GP II, LLC","position":7,"cik":"0001658891","reported_name":"VIEX Special Opportunities GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":8,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":9,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Explanation of Responses"}}],"security":"Common Stock, par value $0.00001","published_at":"2019-07-30T17:02:35.000Z","date":"2019-07-26","kind":"grant","acquired":true,"shares":30120,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Each share is represented by a restricted stock unit, which vests in three equal annual installments on the anniversary of the grant date of 07/26/2019, provided that the Reporting Person continues to serve through each vesting date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F1","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP (\"VSO II\"), Viex Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP II, LLC (\"VSO GP II\"), Viex Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."}],"balance_after":30120,"source":{"system":"sec-edgar","filing":"0000921895-19-002071","document":"form410114025_07302019.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1658891/000092189519002071/form410114025_07302019.xml","form_type":"4"}},{"id":4145302,"issuer":{"id":4987,"kind":"organization","name":"QUANTUM CORP /DE/","symbol":"QMCO"},"owners":[{"id":10128,"kind":"person","name":"Singer Eric","position":1,"cik":"0001443284","reported_name":"Singer Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":122529,"kind":"organization","name":"VIEX Opportunities Fund, LP Series One","position":2,"cik":"0001606750","reported_name":"VIEX Opportunities Fund, LP Series One","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":126253,"kind":"organization","name":"VIEX Opportunities Fund, LP - Series Two","position":3,"cik":"0001659404","reported_name":"VIEX Opportunities Fund, LP Series Two","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":133883,"kind":"organization","name":"VIEX Special Opportunities Fund III, LP","position":4,"cik":"0001619126","reported_name":"VIEX Special Opportunities Fund III, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146803,"kind":"organization","name":"VIEX Special Opportunities GP III, LLC","position":5,"cik":"0001676049","reported_name":"VIEX Special Opportunities GP III, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":122530,"kind":"organization","name":"VIEX GP, LLC","position":6,"cik":"0001654852","reported_name":"VIEX GP, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":107329,"kind":"organization","name":"VIEX Capital Advisors, LLC","position":7,"cik":"0001619125","reported_name":"VIEX Capital Advisors, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-12-04T21:18:49.000Z","date":"2017-12-01","kind":"grant","acquired":true,"shares":16681,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One (\"Series One\"), a series of VIEX Opportunities Fund, LP (\"VIEX Opportunities\"), a series limited partnership, VIEX Opportunities Fund, LP - Series Two (\"Series Two\"), a series of VIEX Opportunities, VIEX Special Opportunities Fund III, LP (\"VSO III\"), VIEX GP, LLC (\"VIEX GP\"), VIEX Special Opportunities GP III, LLC (\"VSO GP III\"), VIEX Capital Advisors, LLC (\"VIEX Capital\"), and Eric Singer (collectively, the \"Reporting Persons\")."},{"field":"security","element":"securityTitle","label":"F2","text":"The Reporting Persons are filing this report because each of the Reporting Persons is a member of a Section 13(d) group, disclosed in a Schedule 13D filed on behalf of the Reporting Persons, as it may be amended, which beneficially owns in the aggregate more than 10% of the Issuer's outstanding shares of Common Stock. Each Reporting Person disclaims beneficial ownership of the shares of Common Stock reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such shares of Common Stock for purposes of Section 16 or for any other purpose."},{"field":"shares","element":"transactionShares","label":"F3","text":"Restricted stock units will fully vest on the earlier to occur of: i) the date of Quantum Corporation's next Annual Stockholder Meeting; and ii) September 1, 2018."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Reflects a 1-for-8 reverse stock split of the Issuer's common stock effected on April 18, 2017."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Mr. Singer, as the managing member of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the (i) 925,983 Shares owned by Series One, (ii) 176,648 Shares owned by Series Two and (iii) 2,588,833 owned by VSO III."}],"balance_after":16681,"source":{"system":"sec-edgar","filing":"0001209191-17-063533","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/709283/000120919117063533/doc4.xml","form_type":"4"}}]}