{"transactions":[{"id":1499680,"issuer":{"id":3936,"kind":"organization","name":"LifeStance Health Group, Inc.","symbol":"LFST"},"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":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 GP of 10% owner"}},{"id":90501,"kind":"organization","name":"SUMMIT PARTNERS ENTREPRENEUR ADVISORS GP II, LLC","position":3,"cik":"0001846778","reported_name":"SUMMIT PARTNERS ENTREPRENEUR ADVISORS GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":90502,"kind":"organization","name":"SUMMIT PARTNERS GE IX, L.P.","position":4,"cik":"0001846731","reported_name":"SUMMIT PARTNERS GE IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":90503,"kind":"organization","name":"SUMMIT PARTNERS GE IX, LLC","position":5,"cik":"0001846688","reported_name":"SUMMIT PARTNERS GE IX, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":6,"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"}}],"security":"Common Stock","published_at":"2024-05-29T20:59:28.000Z","date":"2024-05-24","kind":"sale","planned":false,"acquired":false,"shares":3802345,"price":5.89,"value":22395812.05,"ownership":{"direct":false,"nature":"See Footnotes."},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 2,328,399 shares sold by Summit Partners Growth Equity Fund IX-A, L.P., 1,453,820 shares sold by Summit Partners Growth Equity Fund IX-B, L.P., 16,253 shares sold by Summit Investors GE IX/VC IV, LLC, 2,173 shares sold by Summit Partners Entrepreneur Advisors Fund II, L.P., and 1,700 shares sold by Summit Investors GE IX/VC IV (UK), L.P."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 25,677,643 shares held by Summit Partners Growth Equity Fund IX-A, L.P., 16,032,765 shares held by Summit Partners Growth Equity Fund IX-B, L.P., 179,239 shares held by Summit Investors GE IX/VC IV, LLC, 23,961 shares held by Summit Partners Entrepreneur Advisors Fund II, L.P., and 18,750 shares held by Summit Investors GE IX/VC IV (UK), L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners GE IX, LLC, which is general partner of Summit Partners GE IX, LP, which is the general partner of Summit Partners Growth Equity Fund IX-A, L.P. and Summit Partners Growth Equity Fund IX-B, L.P. Summit Master Company, LLC is (i) the sole member of Summit Partners Entrepreneur Advisors GP II, LLC, which is the general partner of Summit Partners Entrepreneur Advisors Fund II, L.P. and (ii) the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors GE IX/VC IV, LLC, and the general partner of Summit Investors GE IX/VC IV (UK), L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Summit Master Company, LLC, as the sole member of Summit Partners Entrepreneur Advisors GP II, LLC and 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 LifeStance Health Group, Inc. Summit Partners, L.P., through a three-person investment committee, currently composed of Peter Y. Chung, Mark A. deLaar and Craig D. Frances, has voting and dispositive authority over the shares held by each of these entities and therefore beneficially owns such shares. Each of the Summit Funds, Mr. Chung, Mr. deLaar and Dr. Frances disclaim beneficial ownership of the shares, except, in each case, to the extent of such person's or entity's pecuniary interest therein."}],"balance_after":41932358,"source":{"system":"sec-edgar","filing":"0000950170-24-066046","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000095017024066046/ownership.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":2652709,"issuer":{"id":3936,"kind":"organization","name":"LifeStance Health Group, Inc.","symbol":"LFST"},"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":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":90501,"kind":"organization","name":"SUMMIT PARTNERS ENTREPRENEUR ADVISORS GP II, LLC","position":3,"cik":"0001846778","reported_name":"SUMMIT PARTNERS ENTREPRENEUR ADVISORS GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":90502,"kind":"organization","name":"SUMMIT PARTNERS GE IX, L.P.","position":4,"cik":"0001846731","reported_name":"SUMMIT PARTNERS GE IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":90503,"kind":"organization","name":"SUMMIT PARTNERS GE IX, LLC","position":5,"cik":"0001846688","reported_name":"SUMMIT PARTNERS GE IX, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":6,"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"}}],"security":"Common Stock","published_at":"2021-06-29T21:19:34.000Z","date":"2021-06-25","kind":"sale","acquired":false,"shares":1140704,"price":17.01,"value":19403375.04,"ownership":{"direct":false,"nature":"See Footnotes."},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 698,520 shares sold by Summit Partners Growth Equity Fund IX-A, L.P., 436,146 shares sold by Summit Partners Growth Equity Fund IX-B, L.P., 4,876 shares sold by Summit Investors GE IX/VC IV, LLC, 652 shares sold by Summit Partners Entrepreneur Advisors Fund II, L.P., and 510 shares sold by Summit Investors GE IX/VC IV (UK), L.P."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 28,006,042 shares held by Summit Partners Growth Equity Fund IX-A, L.P., 17,486,585 shares held by Summit Partners Growth Equity Fund IX-B, L.P., 195,492 shares held by Summit Investors GE IX/VC IV, LLC, 26,134 shares held by Summit Partners Entrepreneur Advisors Fund II, L.P., and 20,450 shares held by Summit Investors GE IX/VC IV (UK), L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners GE IX, LLC, which is general partner of Summit Partners GE IX, LP, which is the general partner of Summit Partners Growth Equity Fund IX-A, L.P. and Summit Partners Growth Equity Fund IX-B, L.P. Summit Master Company, LLC is (i) the sole member of Summit Partners Entrepreneur Advisors GP II, LLC, which is the general partner of Summit Partners Entrepreneur Advisors Fund II, L.P. and (ii) the general partner of Summit Partners L.P., which is the manager of Summit Investors Management, LLC, which is the manager of Summit Investors GE IX/VC IV, LLC, and the general partner of Summit Investors GE IX/VC IV (UK), L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Summit Master Company, LLC, as the sole member of Summit Partners Entrepreneur Advisors GP II, LLC and 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 LifeStance Health Group, Inc. Summit Partners, L.P., through a three-person investment committee, currently composed of Peter Y. Chung, Mark A. deLaar and Craig D. Frances, has voting and dispositive authority over the shares held by each of these entities and therefore beneficially owns such shares. Each of the Summit Funds, Mr. Chung, Mr. deLaar and Dr. Frances disclaim disclaims beneficial ownership of the shares, except, in each case, to the extent of such person's or entity's pecuniary interest therein."}],"balance_after":45734703,"source":{"system":"sec-edgar","filing":"0001179110-21-007117","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000117911021007117/edgar.xml","form_type":"4"}},{"id":2667190,"issuer":{"id":3936,"kind":"organization","name":"LifeStance Health Group, Inc.","symbol":"LFST"},"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":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":90501,"kind":"organization","name":"SUMMIT PARTNERS ENTREPRENEUR ADVISORS GP II, LLC","position":3,"cik":"0001846778","reported_name":"SUMMIT PARTNERS ENTREPRENEUR ADVISORS GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":90502,"kind":"organization","name":"SUMMIT PARTNERS GE IX, L.P.","position":4,"cik":"0001846731","reported_name":"SUMMIT PARTNERS GE IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":90503,"kind":"organization","name":"SUMMIT PARTNERS GE IX, LLC","position":5,"cik":"0001846688","reported_name":"SUMMIT PARTNERS GE IX, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"GP of 10% owner"}},{"id":90504,"kind":"organization","name":"Summit Investors Management, LLC","position":6,"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"}}],"security":"Common Stock","published_at":"2021-06-16T20:50:25.000Z","date":"2021-06-14","kind":"sale","acquired":false,"shares":1368844,"price":17.01,"value":23284036.44,"ownership":{"direct":false,"nature":"See Footnotes."},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 838,224 shares sold by Summit Partners Growth Equity Fund IX-A, L.P., 523,375 shares sold by Summit Partners Growth Equity Fund IX-B, L.P., 5,851 shares sold by Summit Investors GE IX/VC IV, LLC, 782 shares sold by Summit Partners Entrepreneur Advisors Fund II, L.P., and 612 shares sold by Summit Investors GE IX/VC IV (UK), L.P."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 28,704,562 shares held by Summit Partners Growth Equity Fund IX-A, L.P., 17,922,731shares held by Summit Partners Growth Equity Fund IX-B, L.P., 200,368 shares held by Summit Investors GE IX/VC IV, LLC, 26,786 shares held by Summit Partners Entrepreneur Advisors Fund II, L.P., and 20,960 shares held by Summit Investors GE IX/VC IV (UK), L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Summit Partners, L.P. is the managing member of Summit Partners GE IX, LLC, which is general partner of Summit Partners GE IX, LP, which is the general partner of Summit Partners Growth Equity Fund IX-A, L.P. and Summit Partners Growth Equity Fund IX-B, L.P. Summit Master Company, LLC is (i) the sole member of Summit Partners Entrepreneur Advisors GP II, LLC, which is the general partner of Summit Partners Entrepreneur Advisors Fund II, L.P. and (ii) the general partner of Summit Partners L.P., which is the manager of Summit Investors Management, LLC, which is the manager of Summit Investors GE IX/VC IV, LLC, and the general partner of Summit Investors GE IX/VC IV (UK), L.P."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Summit Master Company, LLC, as the sole member of Summit Partners Entrepreneur Advisors GP II, LLC and 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 LifeStance Health Group, Inc. Summit Partners, L.P., through a three-person investment committee, currently composed of Peter Y. Chung, Mark A. deLaar and Craig D. Frances, has voting and dispositive authority over the shares held by each of these entities and therefore beneficially owns such shares. Each of the Summit Funds, Mr. Chung, Mr. deLaar and Dr. Frances disclaim disclaims beneficial ownership of the shares, except, in each case, to the extent of such person's or entity's pecuniary interest therein."}],"balance_after":46875407,"source":{"system":"sec-edgar","filing":"0001179110-21-006788","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/830588/000117911021006788/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"}}]}