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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"}}]}