{"transactions":[{"id":1967186,"issuer":{"id":94837,"kind":"organization","name":"EngageSmart, Inc.","symbol":"ESMT"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115876,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-A, L.P.","position":2,"cik":"0001514386","reported_name":"Summit Partners Growth Equity Fund VIII-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115877,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-B, L.P.","position":3,"cik":"0001514388","reported_name":"Summit Partners Growth Equity Fund VIII-B, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115878,"kind":"organization","name":"Summit Partners Entrepreneur Advisors Fund I, L.P.","position":4,"cik":"0001604887","reported_name":"Summit Partners Entrepreneur Advisors Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":5,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":6,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90500,"kind":"organization","name":"SUMMIT MASTER COMPANY, LLC","position":7,"cik":"0001627278","reported_name":"SUMMIT MASTER COMPANY, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":46439,"kind":"person","name":"CHUNG PETER Y","position":8,"cik":"0001239366","reported_name":"CHUNG PETER Y","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115881,"kind":"person","name":"COLLINS SCOTT C","position":9,"cik":"0001255670","reported_name":"COLLINS SCOTT C","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, par value $0.001 per share","published_at":"2023-03-07T22:00:18.000Z","date":"2023-03-07","kind":"sale","acquired":false,"shares":252727,"price":18.1925,"value":4597735.9475,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents (i) 181,406 shares of Common Stock sold by Summit Partners Growth Equity Fund VIII-A, L.P., (ii) 66,271 shares of Common Stock sold by Summit Partners Growth Equity Fund VIII-B, L.P., (iii) 1,203 shares of Common Stock sold by Summit Partners Entrepreneur Advisors Fund I, L.P., (iv) 3,473 shares of Common Stock sold by Summit Investors I, LLC and (v) 374 shares of Common Stock sold by Summit Investors I (UK), L.P. The reported sales were effected pursuant to a full exercise by the underwriters of a greenshoe option of the previously reported underwritten public offering that closed on March 3, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This amount represents a public offering price of $19.00 per share of Common Stock of EngageSmart, Inc. (the \"Company\"), less an underwriting discount of $0.8075 per share for shares sold in an underwritten public offering."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Consists of (i) 17,948,333 shares of Common Stock held by Summit Partners Growth Equity Fund VIII-A, L.P., (ii) 6,556,911 shares of Common Stock held by Summit Partners Growth Equity Fund VIII-B, L.P.,(iii) 119,071 shares of Common Stock held by Summit Partners Entrepreneur Advisors Fund I, L.P., (iv) 343,615 shares of Common Stock held by Summit Investors I, LLC and (v) 37,043 shares of Common Stock held by Summit Investors I (UK), L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Summit Partners, L.P. is the managing member of Summit Partners GE VIII, LLC, which is the general partner of Summit Partners GE VIII, L.P., which is the general partner of each of Summit Partners Growth Equity Fund VIII-A, L.P. and Summit Partners Growth Equity Fund VIII-B, L.P. Summit Master Company, LLC is the (A) sole managing member of Summit Partners Entrepreneur Advisors GP, LLC, which is the general partner of Summit Partners Entrepreneur Advisors Fund I, L.P., and (B) the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC and the general partner of Summit Investors I (UK), L.P. Summit Master Company, LLC, as the sole managing member of Summit Partners Entrepreneur Advisors GP, LLC and"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"(Continued from footnote 4), has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. Investment decisions for Summit Partners, L.P. are made by its two-person Investment Committee, which is currently composed of Scott Collins and Peter Y. Chung. Summit Partners L.P., Scott Collins and Peter Y. Chung each have voting and dispositive authority over the shares held by each of these entities and therefore beneficially owns such shares. Each of the entities affiliated with Summit Partners, L.P. that are mentioned herein and each of Mr. Collins and Mr. Chung disclaims beneficial ownership of the shares of common stock, in each case, except to the extent of it or his pecuniary interest therein."}],"balance_after":25004973,"source":{"system":"sec-edgar","filing":"0000899243-23-007378","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000089924323007378/doc4.xml","form_type":"4"}},{"id":1976778,"issuer":{"id":94837,"kind":"organization","name":"EngageSmart, Inc.","symbol":"ESMT"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115876,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-A, L.P.","position":2,"cik":"0001514386","reported_name":"Summit Partners Growth Equity Fund VIII-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115877,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-B, L.P.","position":3,"cik":"0001514388","reported_name":"Summit Partners Growth Equity Fund VIII-B, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115878,"kind":"organization","name":"Summit Partners Entrepreneur Advisors Fund I, L.P.","position":4,"cik":"0001604887","reported_name":"Summit Partners Entrepreneur Advisors Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":5,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":6,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90500,"kind":"organization","name":"SUMMIT MASTER COMPANY, LLC","position":7,"cik":"0001627278","reported_name":"SUMMIT MASTER COMPANY, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":46439,"kind":"person","name":"CHUNG PETER Y","position":8,"cik":"0001239366","reported_name":"CHUNG PETER Y","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115881,"kind":"person","name":"COLLINS SCOTT C","position":9,"cik":"0001255670","reported_name":"COLLINS SCOTT C","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, par value $0.001 per share","published_at":"2023-03-03T22:26:56.000Z","date":"2023-03-03","kind":"sale","acquired":false,"shares":1669052,"price":18.1925,"value":30364228.51,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents (i) 1,198,029 shares of Common Stock sold by Summit Partners Growth Equity Fund VIII-A, L.P., (ii) 437,666 shares of Common Stock sold by Summit Partners Growth Equity Fund VIII-B, L.P., (iii) 7,948 shares of Common Stock sold by Summit Partners Entrepreneur Advisors Fund I, L.P., (iv) 22,936 shares of Common Stock sold by Summit Investors I, LLC and (v) 2,473 shares of Common Stock sold by Summit Investors I (UK), L.P."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This amount represents a public offering price of $19.00 per share of Common Stock of EngageSmart, Inc. (the \"Company\"), less an underwriting discount of $0.8075 per share for shares sold in an underwritten public offering."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Consists of (i) 18,129,739 shares of Common Stock held by Summit Partners Growth Equity Fund VIII-A, L.P., (ii) 6,623,182 shares of Common Stock held by Summit Partners Growth Equity Fund VIII-B, L.P.,(iii) 120,274 shares of Common Stock held by Summit Partners Entrepreneur Advisors Fund I, L.P., (iv) 347,088 shares of Common Stock held by Summit Investors I, LLC and (v) 37,417 shares of Common Stock held by Summit Investors I (UK), L.P. This amount includes the underwriters' option to purchase up to an additional 252,727 shares of common stock within 30 days of February 28, 2023."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Summit Partners, L.P. is the managing member of Summit Partners GE VIII, LLC, which is the general partner of Summit Partners GE VIII, L.P., which is the general partner of each of Summit Partners Growth Equity Fund VIII-A, L.P. and Summit Partners Growth Equity Fund VIII-B, L.P. Summit Master Company, LLC is the (A) sole managing member of Summit Partners Entrepreneur Advisors GP, LLC, which is the general partner of Summit Partners Entrepreneur Advisors Fund I, L.P., and (B) the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC and the general partner of Summit Investors I (UK), L.P. Summit Master Company, LLC, as the sole managing member of Summit Partners Entrepreneur Advisors GP, LLC and the managing member of Summit Investors Management, LLC,"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"(Continued from footnote 4), has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. Investment decisions for Summit Partners, L.P. are made by its two-person Investment Committee, which is currently composed of Scott Collins and Peter Y. Chung. Summit Partners L.P., Scott Collins and Peter Y. Chung each have voting and dispositive authority over the shares held by each of these entities and therefore beneficially owns such shares. Each of the entities affiliated with Summit Partners, L.P. that are mentioned herein and each of Mr. Collins and Mr. Chung disclaims beneficial ownership of the shares of common stock, in each case, except to the extent of it or his pecuniary interest therein."}],"balance_after":25257700,"source":{"system":"sec-edgar","filing":"0000899243-23-007034","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000089924323007034/doc4.xml","form_type":"4"}},{"id":2162712,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":123921,"kind":"person","name":"SUMMIT PARTNERS GE VIII, L.P.","position":2,"cik":"0001593029","reported_name":"SUMMIT PARTNERS GE VIII, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":123922,"kind":"person","name":"Summit Partners GE VIII, LLC","position":3,"cik":"0001593948","reported_name":"Summit Partners GE VIII, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":4,"cik":"0001507545","reported_name":"Summit Investors Management, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager of GP of 10% Owner"}},{"id":115876,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-A, L.P.","position":5,"cik":"0001514386","reported_name":"Summit Partners Growth Equity Fund VIII-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115877,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-B, L.P.","position":6,"cik":"0001514388","reported_name":"Summit Partners Growth Equity Fund VIII-B, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":7,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":8,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90500,"kind":"organization","name":"SUMMIT MASTER COMPANY, LLC","position":9,"cik":"0001627278","reported_name":"SUMMIT MASTER COMPANY, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager of Manager of 10% owne"}},{"id":123923,"kind":"person","name":"MANNION MARTIN J","position":10,"cik":"0001018067","reported_name":"MANNION MARTIN J","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager of GP of 10% owner"}}],"security":"Common Stock","published_at":"2022-09-09T20:31:24.000Z","date":"2022-09-08","kind":"disposition_to_issuer","acquired":false,"shares":3500000,"price":12.75,"value":44625000.0,"ownership":{"direct":false,"nature":"See Remarks"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 2,551,588 shares sold by Summit Partners Growth Equity Fund VIII-A, L.P., 932,181 shares sold by Summit Partners Growth Equity Fund VIII-B, L.P., 14,919 shares sold by Summit Investors I, LLC, and 1,312 shares sold by Summit Investors I (UK), L.P."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The reported securities are held as follows: 3,811,230 shares in the name of Summit Partners Growth Equity Fund VIII-A, L.P.; 1,392,372 shares in the name of Summit Partners Growth Equity Fund VIII-B, L.P.; 22,283 shares in the name of Summit Investors I, LLC; 1,961 shares in the name of Summit Investors I (UK), L.P.; 160,360 shares and restricted stock units in the name of Mr. Chung, which are held for the benefit of Summit Partners, L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners GE VIII, LLC, which is the general partner of Summit Partners GE VIII, L.P., which is the general partner of each of Summit Partners Growth Equity Fund VIII-A, L.P. and Summit Partners Growth Equity Fund VIII-B, L.P. Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC and the general partner of Summit Investors I (UK), L.P. Summit Partners GE VIII, LLC, as the general partner of Summit Partners GE VIII, L.P., and Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC has each delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its Investment Committee responsible for voting and investment decisions with respect to the Company.  Summit Partners, L.P., through a two-person Investment Committee, responsible for voting and investment decisions with respect to the Issuer, currently composed of Martin J. Mannion and Peter Y. Chung, has voting and dispositive authority over the shares and restricted stock units reported herein and therefore may be deemed to beneficially own such shares. Each of the Summit entities, Mr. Mannion and Mr. Chung each disclaim beneficial ownership of the shares of common stock and the restricted stock units, except to the extent of their respective pecuniary interest therein."}],"balance_after":5388206,"source":{"system":"sec-edgar","filing":"0001415889-22-009499","document":"form4-09092022_010914.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000141588922009499/form4-09092022_010914.xml","form_type":"4"}},{"id":2220591,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":123921,"kind":"person","name":"SUMMIT PARTNERS GE VIII, L.P.","position":2,"cik":"0001593029","reported_name":"SUMMIT PARTNERS GE VIII, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":123922,"kind":"person","name":"Summit Partners GE VIII, LLC","position":3,"cik":"0001593948","reported_name":"Summit Partners GE VIII, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":4,"cik":"0001507545","reported_name":"Summit Investors Management, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager of GP of 10% Owner"}},{"id":115876,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-A, L.P.","position":5,"cik":"0001514386","reported_name":"Summit Partners Growth Equity Fund VIII-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115877,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-B, L.P.","position":6,"cik":"0001514388","reported_name":"Summit Partners Growth Equity Fund VIII-B, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":7,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":8,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90500,"kind":"organization","name":"SUMMIT MASTER COMPANY, LLC","position":9,"cik":"0001627278","reported_name":"SUMMIT MASTER COMPANY, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager of Manager of 10% owne"}},{"id":123923,"kind":"person","name":"MANNION MARTIN J","position":10,"cik":"0001018067","reported_name":"MANNION MARTIN J","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager of GP of 10% owner"}}],"security":"Common Stock","published_at":"2022-06-28T12:22:54.000Z","date":"2022-06-24","kind":"grant","acquired":true,"shares":10316,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Remarks"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units granted to Mr. Chung as part of the director compensation program. The restricted stock units will vest on June 24, 2023, and will settle solely by delivery of an equal number of shares of Common Stock provided that Mr. Chung remains in continuous service with the Issuer through the vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Common Stock is held as follows: 6,362,818 shares in the name of Summit Partners Growth Equity Fund VIII-A, L.P.; 2,324,553 shares in the name of Summit Partners Growth Equity Fund VIII-B, L.P.; 37,202 shares in the name of Summit Investors I, LLC; 3,273 shares in the name of Summit Investors I (UK), L.P.; 160,360 shares and restricted stock units in the name of Mr. Chung, which are held for the benefit of Summit Partners, L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners GE VIII, LLC, which is the general partner of Summit Partners GE VIII, L.P., which is the general partner of each of Summit Partners Growth Equity Fund VIII-A, L.P. and Summit Partners Growth Equity Fund VIII-B, L.P. Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC and the general partner of Summit Investors I (UK), L.P. Summit Partners GE VIII, LLC, as the general partner of Summit Partners GE VIII, L.P., and Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC has each delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its Investment Committee responsible for voting and investment decisions with respect to the Company.  Summit Partners, L.P., through a two-person Investment Committee, responsible for voting and investment decisions with respect to the Issuer, currently composed of Martin J. Mannion and Peter Y. Chung, has voting and dispositive authority over the shares and restricted stock units reported herein and therefore may be deemed to beneficially own such shares. Each of the Summit entities, Mr. Mannion and Mr. Chung each disclaim beneficial ownership of the shares of common stock and the restricted stock units, except to the extent of their respective pecuniary interest therein."}],"balance_after":8888206,"source":{"system":"sec-edgar","filing":"0001415889-22-007005","document":"form4-06282022_050645.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000141588922007005/form4-06282022_050645.xml","form_type":"4"}},{"id":2478126,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager of GP of 10% owner"}},{"id":123921,"kind":"person","name":"SUMMIT PARTNERS GE VIII, L.P.","position":2,"cik":"0001593029","reported_name":"SUMMIT PARTNERS GE VIII, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":123922,"kind":"person","name":"Summit Partners GE VIII, LLC","position":3,"cik":"0001593948","reported_name":"Summit Partners GE VIII, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":4,"cik":"0001507545","reported_name":"Summit Investors Management, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager and GP of 10% Owner"}},{"id":115876,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-A, L.P.","position":5,"cik":"0001514386","reported_name":"Summit Partners Growth Equity Fund VIII-A, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115877,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-B, L.P.","position":6,"cik":"0001514388","reported_name":"Summit Partners Growth Equity Fund VIII-B, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":7,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":8,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":123923,"kind":"person","name":"MANNION MARTIN J","position":9,"cik":"0001018067","reported_name":"MANNION MARTIN J","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2021-12-10T11:05:25.000Z","date":"2021-12-07","kind":"sale","acquired":false,"shares":700000,"price":15.05,"value":10535000.0,"ownership":{"direct":false,"nature":"See Footnotes."},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The Common Stock sold as follows: 510,318 shares in the name of Summit Partners Growth Equity Fund VIII-A, L.P.; 186,436 shares in the name of Summit Partners Growth Equity Fund VIII-B, L.P.; 2,984 shares in the name of Summit Investors I, LLC; 262 shares in the name of Summit Investors I (UK), L.P."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Common Stock held as follows: 6,362,818 shares in the name of Summit Partners Growth Equity Fund VIII-A, L.P.; 2,324,553 shares in the name of Summit Partners Growth Equity Fund VIII-B, L.P.; 37,202 shares in the name of Summit Investors I, LLC; 3,273 shares in the name of Summit Investors I (UK), L.P.; 150,044 shares (including shares underlying RSUs) in the name of Mr. Chung, which are held for the benefit of Summit Partners, L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners GE VIII, LLC, which is the general partner of Summit Partners GE VIII, L.P., which is the general partner of each of Summit Partners Growth Equity Fund VIII-A, L.P. and Summit Partners Growth Equity Fund VIII-B, L.P.   Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC and the general partner of Summit Investors I (UK), L.P. Summit Partners GE VIII, LLC, as the general partner of Summit Partners GE VIII, L.P., and Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC has each delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its Investment Committee responsible for voting and investment decisions with respect to the Company."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Summit Partners, L.P., through a two-person Investment Committee responsible for voting and investment decisions with respect to the Company, currently composed of Martin J. Mannion and Mr. Chung, has voting and dispositive authority over the shares of Common Stock held by each of the entities described in the foregoing footnotes (2) and (3) and therefore may be deemed to beneficially own such shares. In addition, Mr. Chung is a member of Summit Master Company, LLC. Each of the Summit entities, Mr. Mannion and Mr. Chung disclaims beneficial ownership of the shares of Common Stock (including shares underlying RSUs) reported herein, except to the extent of their pecuniary interest therein."}],"balance_after":8877890,"source":{"system":"sec-edgar","filing":"0001179110-21-010804","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000117911021010804/edgar.xml","form_type":"4"}},{"id":2733626,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of GP of 10% owner"}},{"id":123922,"kind":"person","name":"Summit Partners GE VIII, LLC","position":2,"cik":"0001593948","reported_name":"Summit Partners GE VIII, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":123921,"kind":"person","name":"SUMMIT PARTNERS GE VIII, L.P.","position":3,"cik":"0001593029","reported_name":"SUMMIT PARTNERS GE VIII, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":115876,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-A, L.P.","position":4,"cik":"0001514386","reported_name":"Summit Partners Growth Equity Fund VIII-A, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115877,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-B, L.P.","position":5,"cik":"0001514388","reported_name":"Summit Partners Growth Equity Fund VIII-B, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90500,"kind":"organization","name":"SUMMIT MASTER COMPANY, LLC","position":6,"cik":"0001627278","reported_name":"SUMMIT MASTER COMPANY, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager of Manager of 10% owne"}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":7,"cik":"0001507545","reported_name":"Summit Investors Management, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager and GP of 10% Owner"}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":8,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":9,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":123923,"kind":"person","name":"MANNION MARTIN J","position":10,"cik":"0001018067","reported_name":"MANNION MARTIN J","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2021-05-03T21:29:03.000Z","date":"2021-04-29","kind":"grant","acquired":true,"shares":16949,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnotes."},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") of the Company granted to Mr. Chung as part of the Company's director compensation program. Each share is represented by a RSU. The RSUs will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's next Annual Meeting, subject to the Reporting Person's continued service as of such date. Mr. Chung holds any RSUs for the benefit of Summit Partners, L.P., which he has empowered to determine when the underlying shares of Common Stock will be sold and which is entitled to the proceeds of any such sales."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Common Stock is held as follows: 6,873,136 shares in the name of Summit Partners Growth Equity Fund VIII-A, L.P.; 2,510,989 shares in the name of Summit Partners Growth Equity Fund VIII-B, L.P.; 40,186 shares in the name of Summit Investors I, LLC; 3,535 shares in the name of Summit Investors I (UK), L.P.; 150,044 shares (including shares underlying RSUs) in the name of Mr. Chung, which are held for the benefit of Summit Partners, L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners GE VIII, LLC, which is the general partner of Summit Partners GE VIII, L.P., which is the general partner of each of Summit Partners Growth Equity Fund VIII-A, L.P. and Summit Partners Growth Equity Fund VIII-B, L.P.   Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC and the general partner of Summit Investors I (UK), L.P. Summit Partners GE VIII, LLC, as the general partner of Summit Partners GE VIII, L.P., and Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC has each delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its Investment Committee responsible for voting and investment decisions with respect to the Company."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Summit Partners, L.P., through a two-person Investment Committee responsible for voting and investment decisions with respect to the Company, currently composed of Martin J. Mannion and Mr. Chung, has voting and dispositive authority over the shares of Common Stock held by each of the entities described in the foregoing footnotes (2) and (3) and therefore may be deemed to beneficially own such shares. In addition, Mr. Chung is a member of Summit Master Company, LLC. Each of the Summit entities, Mr. Mannion and Mr. Chung disclaims beneficial ownership of the shares of Common Stock (including shares underlying RSUs) reported herein, except to the extent of their pecuniary interest therein."}],"balance_after":9577890,"source":{"system":"sec-edgar","filing":"0001179110-21-004801","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000117911021004801/edgar.xml","form_type":"4"}},{"id":3132851,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of GP of 10% owner"}},{"id":115876,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-A, L.P.","position":2,"cik":"0001514386","reported_name":"Summit Partners Growth Equity Fund VIII-A, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115877,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-B, L.P.","position":3,"cik":"0001514388","reported_name":"Summit Partners Growth Equity Fund VIII-B, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":123921,"kind":"person","name":"SUMMIT PARTNERS GE VIII, L.P.","position":4,"cik":"0001593029","reported_name":"SUMMIT PARTNERS GE VIII, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":123922,"kind":"person","name":"Summit Partners GE VIII, LLC","position":5,"cik":"0001593948","reported_name":"Summit Partners GE VIII, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":6,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":7,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":8,"cik":"0001507545","reported_name":"Summit Investors Management, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager and GP of 10% Owner"}},{"id":90500,"kind":"organization","name":"SUMMIT MASTER COMPANY, LLC","position":9,"cik":"0001627278","reported_name":"SUMMIT MASTER COMPANY, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager of Manager of 10% owne"}},{"id":123923,"kind":"person","name":"MANNION MARTIN J","position":10,"cik":"0001018067","reported_name":"MANNION MARTIN J","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-05-28T20:29:24.000Z","date":"2020-05-27","kind":"grant","acquired":true,"shares":21865,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnotes."},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") of the Issuer granted to Mr. Chung as part of the Issuer's director compensation program. The RSUs will settle solely by delivery of an equal number of shares of the Issuer's common stock, par value $0.00001 per share (\"Common Stock\") on the earlier of the first anniversary of the grant date or the date of the 2021 annual meeting of stockholders of the Issuer, subject to the Reporting Person's continued service on the Issuer's board of directors as of such date. Mr. Chung holds any RSUs for the benefit of Summit Partners, L.P., which he has empowered to determine when the underlying shares of Common Stock will be sold and which is entitled to the proceeds of any such sales."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Common Stock is held as follows: 6,873,136 shares in the name of Summit Partners Growth Equity Fund VIII-A, L.P.; 2,510,989 shares in the name of Summit Partners Growth Equity Fund VIII-B, L.P.; 40,186 shares in the name of Summit Investors I, LLC; 3,535 shares in the name of Summit Investors I (UK), L.P.; 133,095 shares (including shares underlying RSUs) in the name of Mr. Chung, which are held for the benefit of Summit Partners, L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners GE VIII, LLC, which is the general partner of Summit Partners GE VIII, L.P., which is the general partner of each of Summit Partners Growth Equity Fund VIII-A, L.P. and Summit Partners Growth Equity Fund VIII-B, L.P.  Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC and the general partner of Summit Investors I (UK), L.P. Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its Investment Committee responsible for voting and investment decisions with respect to the Issuer."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Summit Partners, L.P., through a two-person Investment Committee responsible for voting and investment decisions with respect to the Issuer, currently composed of Martin J. Mannion and Mr. Chung, has voting and dispositive authority over the shares of Common Stock held by each of the entities described in the foregoing footnotes (2) and (3) and therefore may be deemed to beneficially own such shares. In addition, Mr. Chung is a member of Summit Master Company, LLC. Each of the Summit entities, Mr. Mannion and Mr. Chung disclaims beneficial ownership of the shares of Common Stock (including shares underlying RSUs) reported herein, except to the extent of their pecuniary interest therein."}],"balance_after":9560941,"source":{"system":"sec-edgar","filing":"0001179110-20-006675","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000117911020006675/edgar.xml","form_type":"4"}},{"id":3350307,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of GP of 10% owner"}},{"id":123921,"kind":"person","name":"SUMMIT PARTNERS GE VIII, L.P.","position":2,"cik":"0001593029","reported_name":"SUMMIT PARTNERS GE VIII, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":123922,"kind":"person","name":"Summit Partners GE VIII, LLC","position":3,"cik":"0001593948","reported_name":"Summit Partners GE VIII, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":115876,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-A, L.P.","position":4,"cik":"0001514386","reported_name":"Summit Partners Growth Equity Fund VIII-A, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115877,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-B, L.P.","position":5,"cik":"0001514388","reported_name":"Summit Partners Growth Equity Fund VIII-B, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":6,"cik":"0001507545","reported_name":"Summit Investors Management, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager and GP of 10% Owner"}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":7,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":8,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":123923,"kind":"person","name":"MANNION MARTIN J","position":9,"cik":"0001018067","reported_name":"MANNION MARTIN J","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90500,"kind":"organization","name":"SUMMIT MASTER COMPANY, LLC","position":10,"cik":"0001627278","reported_name":"SUMMIT MASTER COMPANY, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager of Manager of 10% owne"}}],"security":"Common Stock","published_at":"2019-12-06T21:03:09.000Z","date":"2019-12-04","kind":"grant","acquired":true,"shares":23547,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnotes."},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units granted to Mr. Chung as part of the director compensation program. The restricted stock units will settle solely by delivery of an equal number of shares of Common Stock on the earlier of the first anniversary of the grant date or the date of the Issuer's next Annual Meeting, subject to the Reporting Person's continued service on the board of directors as of such date. Mr. Chung holds any restricted stock units for the benefit of Summit Partners, L.P., which he has empowered to determine when the underlying shares will be sold and which is entitled to the proceeds of any such sales."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Common Stock is held as follows: 6,873,136 shares in the name of Summit Partners Growth Equity Fund VIII-A, L.P.; 2,510,989 shares in the name of Summit Partners Growth Equity Fund VIII-B, L.P.; 40,186 shares in the name of Summit Investors I, LLC; 3,535 shares in the name of Summit Investors I (UK), L.P.; 111,230 shares and restricted stock units in the name of Peter Y. Chung, which are held for the benefit of Summit Partners, L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners GE VIII, LLC, which is the general partner of Summit Partners GE VIII, L.P., which is the general partner of each of Summit Partners Growth Equity Fund VIII-A, L.P. and Summit Partners Growth Equity Fund VIII-B, L.P.  Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC and the general partner of Summit Investors I (UK), L.P. Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its Investment Committee responsible for voting and investment decisions with respect to the Issuer."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Summit Partners, L.P., through a two-person Investment Committee responsible for voting and investment decisions with respect to the Issuer, currently composed of Martin J. Mannion and Peter Y. Chung, has voting and dispositive authority over the shares held by each of these entities and therefore may be deemed to beneficially own such shares. In addition, Mr. Chung is a member of Summit Master Company, LLC. Each of the Summit entities mentioned herein, Summit Partners, L.P., Summit Master Company, LLC, Mr. Mannion and Mr. Chung disclaims beneficial ownership of the shares of Common Stock and the restricted stock units, except to the extent of their pecuniary interest therein."}],"balance_after":9539076,"source":{"system":"sec-edgar","filing":"0001179110-19-012507","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000117911019012507/edgar.xml","form_type":"4"}},{"id":3770043,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of GP of 10% owner"}},{"id":90500,"kind":"organization","name":"SUMMIT MASTER COMPANY, LLC","position":2,"cik":"0001627278","reported_name":"SUMMIT MASTER COMPANY, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager of Manager of 10% owne"}},{"id":123921,"kind":"person","name":"SUMMIT PARTNERS GE VIII, L.P.","position":3,"cik":"0001593029","reported_name":"SUMMIT PARTNERS GE VIII, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":123922,"kind":"person","name":"Summit Partners GE VIII, LLC","position":4,"cik":"0001593948","reported_name":"Summit Partners GE VIII, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":115876,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-A, L.P.","position":5,"cik":"0001514386","reported_name":"Summit Partners Growth Equity Fund VIII-A, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115877,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-B, L.P.","position":6,"cik":"0001514388","reported_name":"Summit Partners Growth Equity Fund VIII-B, L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":7,"cik":"0001507545","reported_name":"Summit Investors Management, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager and GP of 10% Owner"}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":8,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":9,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":123923,"kind":"person","name":"MANNION MARTIN J","position":10,"cik":"0001018067","reported_name":"MANNION MARTIN J","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2018-11-09T21:22:48.000Z","date":"2018-11-07","kind":"grant","acquired":true,"shares":23112,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnotes."},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units granted to Mr. Chung as part of the director compensation program. The restricted stock units will settle solely by delivery of an equal number of shares of Common Stock on the earlier of the first anniversary of the grant date or the date of the Issuer's next Annual Meeting, subject to the Reporting Person's continued service on the board of directors as of such date. Mr. Chung holds any restricted stock units for the benefit of Summit Partners, L.P., which he has empowered to determine when the underlying shares will be sold and which is entitled to the proceeds of any such sales."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Common Stock is held as follows: 6,873,136 shares in the name of Summit Partners Growth Equity Fund VIII-A, L.P.; 2,510,989 shares in the name of Summit Partners Growth Equity Fund VIII-B, L.P.; 40,186 shares in the name of Summit Investors I, LLC; 3,535 shares in the name of Summit Investors I (UK), L.P.; 87,683 shares and restricted stock units in the name of Peter Y. Chung, which are held for the benefit of Summit Partners, L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners GE VIII, LLC, which is the general partner of Summit Partners GE VIII, L.P., which is the general partner of each of Summit Partners Growth Equity Fund VIII-A, L.P. and Summit Partners Growth Equity Fund VIII-B, L.P.  Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC and the general partner of Summit Investors I (UK), L.P. Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its Investment Committee responsible for voting and investment decisions with respect to the Issuer."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Summit Partners, L.P., through a two-person Investment Committee responsible for voting and investment decisions with respect to the Issuer, currently composed of Martin J. Mannion and Peter Y. Chung, has voting and dispositive authority over the shares held by each of these entities and therefore may be deemed to beneficially own such shares. In addition, Mr. Chung is a member of Summit Master Company, LLC. Each of the Summit entities mentioned herein, Summit Partners, L.P., Summit Master Company, LLC, Mr. Mannion and Mr. Chung disclaims beneficial ownership of the shares of Common Stock and the restricted stock units, except to the extent of their pecuniary interest therein."}],"balance_after":9515529,"source":{"system":"sec-edgar","filing":"0001179110-18-012729","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000117911018012729/edgar.xml","form_type":"4"}},{"id":3954118,"issuer":{"id":95402,"kind":"organization","name":"Casa Systems Inc","symbol":"CASA"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of GP of 10% owner"}},{"id":90500,"kind":"organization","name":"SUMMIT MASTER COMPANY, LLC","position":2,"cik":"0001627278","reported_name":"SUMMIT MASTER COMPANY, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of Manager of 10% owne"}},{"id":167193,"kind":"organization","name":"Summit Partners PE VII, L.P.","position":3,"cik":"0001486418","reported_name":"Summit Partners PE VII, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"GP of 10% owner."}},{"id":167194,"kind":"organization","name":"Summit Partners PE VII, LLC","position":4,"cik":"0001486419","reported_name":"Summit Partners PE VII, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"GP of GP of 10% owner"}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":5,"cik":"0001507545","reported_name":"Summit Investors Management, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager and GP of 10% Owner"}},{"id":167195,"kind":"organization","name":"Summit Partners Private Equity Fund VII-A, L.P.","position":6,"cik":"0001486421","reported_name":"Summit Partners Private Equity Fund VII-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":167196,"kind":"organization","name":"Summit Partners Private Equity Fund VII B L P","position":7,"cik":"0001385242","reported_name":"Summit Partners Private Equity Fund VII B L P","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":8,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":9,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2018-04-30T20:07:34.000Z","date":"2018-04-30","kind":"sale","acquired":false,"shares":4717520,"price":25,"value":117938000.0,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Consists of 2,940,250 shares of common stock sold by Summit Partners Private Equity Fund VII-A, L.P., 1,765,961 shares of common stock sold by Summit Partners Private Equity Fund VII-B, L.P., 10,037 shares of common stock sold by Summit Investors I, LLC and 1,272 shares of common stock sold by Summit Investors I (UK), L.P."},{"field":"shares","element":"transactionShares","label":"F2","text":"Of the shares sold by the reporting persons mentioned in footnote (1), the sale of 250,000 shares is matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, with the purchase of 250,000 shares on December 19, 2017 at $13.0 per share. The reporting persons mentioned in footnote (1) have paid to the issuer an aggregate of $2,721,875.00, representing the full amount of the profit realized in connection with the short-swing transaction, less transaction costs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Consists of 21,268,476 shares of common stock held by Summit Partners Private Equity Fund VII-A, L.P., 12,774,194 shares of common stock held by Summit Partners Private Equity Fund VII-B, L.P., 72,605 shares of common stock issued held by Summit Investors I, LLC and 9,205 shares of common stock held by Summit Investors I (UK), L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Summit Partners, L.P. is the managing member of Summit Partners PE VII, LLC, which is the general partner of Summit Partners PE VII, L.P., which is the general partner of each of Summit Partners Private Equity Fund VII-A, L.P. and Summit Partners Private Equity Fund VII-B, L.P. Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC, and the general partner of Summit Investors I (UK), L.P. Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC, has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its investment committee responsible for voting and investment decisions with respect to the Issuer."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Summit Partners, L.P., through a three-person investment committee responsible for voting and investment decisions with respect to the Issuer, currently comprised of Peter Y. Chung, Bruce R. Evans and Martin J. Mannion, has voting and dispositive power over the shares held by each of these entities and therefore may be deemed to beneficially own such shares. Each of the Summit entities and persons mentioned in this footnote disclaims beneficial ownership of the shares, except for those shares held of record by such entity, and except to the extent of their pecuniary interest therein."}],"balance_after":34124480,"source":{"system":"sec-edgar","filing":"0001179110-18-005948","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000117911018005948/edgar.xml","form_type":"4"}},{"id":4127446,"issuer":{"id":95402,"kind":"organization","name":"Casa Systems Inc","symbol":"CASA"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of GP of 10% owner"}},{"id":90500,"kind":"organization","name":"SUMMIT MASTER COMPANY, LLC","position":2,"cik":"0001627278","reported_name":"SUMMIT MASTER COMPANY, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of Manager of 10% owne"}},{"id":167193,"kind":"organization","name":"Summit Partners PE VII, L.P.","position":3,"cik":"0001486418","reported_name":"Summit Partners PE VII, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"GP of 10% owner."}},{"id":167194,"kind":"organization","name":"Summit Partners PE VII, LLC","position":4,"cik":"0001486419","reported_name":"Summit Partners PE VII, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"GP of GP of 10% owner"}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":5,"cik":"0001507545","reported_name":"Summit Investors Management, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager and GP of 10% Owner"}},{"id":167195,"kind":"organization","name":"Summit Partners Private Equity Fund VII-A, L.P.","position":6,"cik":"0001486421","reported_name":"Summit Partners Private Equity Fund VII-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":167196,"kind":"organization","name":"Summit Partners Private Equity Fund VII B L P","position":7,"cik":"0001385242","reported_name":"Summit Partners Private Equity Fund VII B L P","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":8,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":9,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series C Convertible Preferred Stock","published_at":"2017-12-19T21:02:26.000Z","date":"2017-12-19","kind":"exercise","acquired":true,"shares":3859200,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The Series C Convertible Preferred Stock automatically converted into common stock of Casa Systems, Inc. (the \"Issuer\") on a ten-for-one basis upon the closing of the Issuer's initial public offering. The Series C Convertible Preferred Stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The Series C Convertible Preferred Stock automatically converted into common stock of Casa Systems, Inc. (the \"Issuer\") on a ten-for-one basis upon the closing of the Issuer's initial public offering. The Series C Convertible Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Series C Convertible Preferred Stock automatically converted into common stock of Casa Systems, Inc. (the \"Issuer\") on a ten-for-one basis upon the closing of the Issuer's initial public offering. The Series C Convertible Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Series C Convertible Preferred Stock automatically converted into common stock of Casa Systems, Inc. (the \"Issuer\") on a ten-for-one basis upon the closing of the Issuer's initial public offering. The Series C Convertible Preferred Stock had no expiration date."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F2","text":"Consists of 24,052,910 shares of common stock issued upon the conversion of Series C Convertible Preferred Stock held by Summit Partners Private Equity Fund VII-A, L.P., 14,446,570 shares of common stock issued upon the conversion of Series C Convertible Preferred Stock held by Summit Partners Private Equity Fund VII-B, L.P., 82,110 shares of common stock issued upon the conversion of Series C Convertible Preferred Stock held by Summit Investors I, LLC and 10,410 shares of common stock issued upon the conversion of Series C Convertible Preferred Stock held by Summit Investors I (UK), L.P."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners PE VII, LLC, which is the general partner of Summit Partners PE VII, L.P., which is the general partner of each of Summit Partners Private Equity Fund VII-A, L.P. and Summit Partners Private Equity Fund VII-B, L.P. Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC, and the general partner of Summit Investors I (UK), L.P. Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC, has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its investment committee responsible for voting and investment decisions with respect to the Issuer."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F4","text":"Summit Partners, L.P., through a three-person investment committee responsible for voting and investment decisions with respect to the Issuer, currently comprised of Peter Y. Chung, Bruce R. Evans and Martin J. Mannion, has voting and dispositive power over the shares held by each of these entities and therefore may be deemed to beneficially own such shares. Each of the Summit entities and persons mentioned in this footnote disclaims beneficial ownership of the shares, except for those shares held of record by such entity, and except to the extent of their pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":38592000},"source":{"system":"sec-edgar","filing":"0001179110-17-015609","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/830588/000117911017015609/edgar.xml","form_type":"4"}},{"id":4127445,"issuer":{"id":95402,"kind":"organization","name":"Casa Systems Inc","symbol":"CASA"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of GP of 10% owner"}},{"id":90500,"kind":"organization","name":"SUMMIT MASTER COMPANY, LLC","position":2,"cik":"0001627278","reported_name":"SUMMIT MASTER COMPANY, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of Manager of 10% owne"}},{"id":167193,"kind":"organization","name":"Summit Partners PE VII, L.P.","position":3,"cik":"0001486418","reported_name":"Summit Partners PE VII, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"GP of 10% owner."}},{"id":167194,"kind":"organization","name":"Summit Partners PE VII, LLC","position":4,"cik":"0001486419","reported_name":"Summit Partners PE VII, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"GP of GP of 10% owner"}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":5,"cik":"0001507545","reported_name":"Summit Investors Management, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager and GP of 10% Owner"}},{"id":167195,"kind":"organization","name":"Summit Partners Private Equity Fund VII-A, L.P.","position":6,"cik":"0001486421","reported_name":"Summit Partners Private Equity Fund VII-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":167196,"kind":"organization","name":"Summit Partners Private Equity Fund VII B L P","position":7,"cik":"0001385242","reported_name":"Summit Partners Private Equity Fund VII B L P","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":8,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":9,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-12-19T21:02:26.000Z","date":"2017-12-19","kind":"purchase","acquired":true,"shares":250000,"price":13,"value":3250000.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"Consists of 155,816 shares of common stock purchased by Summit Partners Private Equity Fund VII-A, L.P., 93,585 shares of common stock purchased by Summit Partners Private Equity Fund VII-B, L.P., 532 shares of common stock issued purchased by Summit Investors I, LLC and 67 shares of common stock purchased by Summit Investors I (UK), L.P."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F6","text":"Consists of 24,208,726 shares of common stock held by Summit Partners Private Equity Fund VII-A, L.P., 14,540,155 shares of common stock held by Summit Partners Private Equity Fund VII-B, L.P., 82,642 shares of common stock issued held by Summit Investors I, LLC and 10,477 shares of common stock held by Summit Investors I (UK), L.P."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners PE VII, LLC, which is the general partner of Summit Partners PE VII, L.P., which is the general partner of each of Summit Partners Private Equity Fund VII-A, L.P. and Summit Partners Private Equity Fund VII-B, L.P. Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC, and the general partner of Summit Investors I (UK), L.P. Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC, has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its investment committee responsible for voting and investment decisions with respect to the Issuer."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F4","text":"Summit Partners, L.P., through a three-person investment committee responsible for voting and investment decisions with respect to the Issuer, currently comprised of Peter Y. Chung, Bruce R. Evans and Martin J. Mannion, has voting and dispositive power over the shares held by each of these entities and therefore may be deemed to beneficially own such shares. Each of the Summit entities and persons mentioned in this footnote disclaims beneficial ownership of the shares, except for those shares held of record by such entity, and except to the extent of their pecuniary interest therein."}],"balance_after":38842000,"source":{"system":"sec-edgar","filing":"0001179110-17-015609","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/830588/000117911017015609/edgar.xml","form_type":"4"}},{"id":4127444,"issuer":{"id":95402,"kind":"organization","name":"Casa Systems Inc","symbol":"CASA"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of GP of 10% owner"}},{"id":90500,"kind":"organization","name":"SUMMIT MASTER COMPANY, LLC","position":2,"cik":"0001627278","reported_name":"SUMMIT MASTER COMPANY, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of Manager of 10% owne"}},{"id":167193,"kind":"organization","name":"Summit Partners PE VII, L.P.","position":3,"cik":"0001486418","reported_name":"Summit Partners PE VII, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"GP of 10% owner."}},{"id":167194,"kind":"organization","name":"Summit Partners PE VII, LLC","position":4,"cik":"0001486419","reported_name":"Summit Partners PE VII, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"GP of GP of 10% owner"}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":5,"cik":"0001507545","reported_name":"Summit Investors Management, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager and GP of 10% Owner"}},{"id":167195,"kind":"organization","name":"Summit Partners Private Equity Fund VII-A, L.P.","position":6,"cik":"0001486421","reported_name":"Summit Partners Private Equity Fund VII-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":167196,"kind":"organization","name":"Summit Partners Private Equity Fund VII B L P","position":7,"cik":"0001385242","reported_name":"Summit Partners Private Equity Fund VII B L P","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":8,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":9,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-12-19T21:02:26.000Z","date":"2017-12-19","kind":"exercise","acquired":true,"shares":38592000,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The Series C Convertible Preferred Stock automatically converted into common stock of Casa Systems, Inc. (the \"Issuer\") on a ten-for-one basis upon the closing of the Issuer's initial public offering. The Series C Convertible Preferred Stock had no expiration date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Consists of 24,052,910 shares of common stock issued upon the conversion of Series C Convertible Preferred Stock held by Summit Partners Private Equity Fund VII-A, L.P., 14,446,570 shares of common stock issued upon the conversion of Series C Convertible Preferred Stock held by Summit Partners Private Equity Fund VII-B, L.P., 82,110 shares of common stock issued upon the conversion of Series C Convertible Preferred Stock held by Summit Investors I, LLC and 10,410 shares of common stock issued upon the conversion of Series C Convertible Preferred Stock held by Summit Investors I (UK), L.P."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners PE VII, LLC, which is the general partner of Summit Partners PE VII, L.P., which is the general partner of each of Summit Partners Private Equity Fund VII-A, L.P. and Summit Partners Private Equity Fund VII-B, L.P. Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC, and the general partner of Summit Investors I (UK), L.P. Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC, has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its investment committee responsible for voting and investment decisions with respect to the Issuer."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F4","text":"Summit Partners, L.P., through a three-person investment committee responsible for voting and investment decisions with respect to the Issuer, currently comprised of Peter Y. Chung, Bruce R. Evans and Martin J. Mannion, has voting and dispositive power over the shares held by each of these entities and therefore may be deemed to beneficially own such shares. Each of the Summit entities and persons mentioned in this footnote disclaims beneficial ownership of the shares, except for those shares held of record by such entity, and except to the extent of their pecuniary interest therein."}],"balance_after":38592000,"source":{"system":"sec-edgar","filing":"0001179110-17-015609","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000117911017015609/edgar.xml","form_type":"4"}},{"id":4296986,"issuer":{"id":4574,"kind":"organization","name":"A10 Networks, Inc.","symbol":"ATEN"},"owners":[{"id":23867,"kind":"organization","name":"SUMMIT PARTNERS L P","position":1,"cik":"0000830588","reported_name":"SUMMIT PARTNERS L P","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of GP of 10% owner"}},{"id":90500,"kind":"organization","name":"SUMMIT MASTER COMPANY, LLC","position":2,"cik":"0001627278","reported_name":"SUMMIT MASTER COMPANY, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager of Manager of 10% owne"}},{"id":123921,"kind":"person","name":"SUMMIT PARTNERS GE VIII, L.P.","position":3,"cik":"0001593029","reported_name":"SUMMIT PARTNERS GE VIII, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":123922,"kind":"person","name":"Summit Partners GE VIII, LLC","position":4,"cik":"0001593948","reported_name":"Summit Partners GE VIII, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":115876,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-A, L.P.","position":5,"cik":"0001514386","reported_name":"Summit Partners Growth Equity Fund VIII-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115877,"kind":"organization","name":"Summit Partners Growth Equity Fund VIII-B, L.P.","position":6,"cik":"0001514388","reported_name":"Summit Partners Growth Equity Fund VIII-B, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115879,"kind":"organization","name":"Summit Investors I, LLC","position":7,"cik":"0001435565","reported_name":"Summit Investors I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":115880,"kind":"organization","name":"Summit Investors I (UK), L.P.","position":8,"cik":"0001494616","reported_name":"Summit Investors I (UK), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":9,"cik":"0001507545","reported_name":"Summit Investors Management, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Manager and GP of 10% Owner"}},{"id":123923,"kind":"person","name":"MANNION MARTIN J","position":10,"cik":"0001018067","reported_name":"MANNION MARTIN J","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-06-02T20:09:02.000Z","date":"2017-05-31","kind":"grant","acquired":true,"shares":18359,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnotes."},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units granted to Mr. Chung as part of the director compensation program. The restricted stock units will settle solely by delivery of an equal number of shares of Common Stock on the first anniversary of the grant date, subject to the Reporting Person's continued service on the board of directors as of such date. Mr. Chung holds any restricted stock units for the benefit of Summit Partners, L.P., which he has empowered to determine when the underlying shares will be sold and which is entitled to the proceeds of any such sales."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Common Stock is held as follows: 6,873,136 shares in the name of Summit Partners Growth Equity Fund VIII-A, L.P.; 2,510,989 shares in the name of Summit Partners Growth Equity Fund VIII-B, L.P.; 40,186 shares in the name of Summit Investors I, LLC; 3,535 shares in the name of Summit Investors I (UK), L.P.; 64,571 shares and restricted stock units in the name of Peter Y. Chung, which are held for the benefit of Summit Partners, L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners GE VIII, LLC, which is the general partner of Summit Partners GE VIII, L.P., which is the general partner of each of Summit Partners Growth Equity Fund VIII-A, L.P. and Summit Partners Growth Equity Fund VIII-B, L.P.  Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC and the general partner of Summit Investors I (UK), L.P. Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its Investment Committee responsible for voting and investment decisions with respect to the Issuer."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Summit Partners, L.P., through a two-person Investment Committee responsible for voting and investment decisions with respect to the Issuer, currently composed of Martin J. Mannion and Peter Y. Chung, has voting and dispositive authority over the shares held by each of these entities and therefore may be deemed to beneficially own such shares. In addition, Mr. Chung is a member of Summit Master Company, LLC. Each of the Summit entities mentioned herein, Summit Partners, L.P., Summit Master Company, LLC, Mr. Mannion and Mr. Chung disclaims beneficial ownership of the shares of Common Stock and the restricted stock units, except to the extent of their pecuniary interest therein."}],"balance_after":9492417,"source":{"system":"sec-edgar","filing":"0001179110-17-008431","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000117911017008431/edgar.xml","form_type":"4"}}]}