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(\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 5,098,435 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,088,564 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,062,019 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 8,403 shares of the Issuer's common stock, and SP holds 340,860 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":10598281,"source":{"system":"sec-edgar","filing":"0000919574-21-001876","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957421001876/ownership.xml","form_type":"4"}},{"id":2946632,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":2,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":3,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":4,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":5,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":6,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":7,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":8,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":9,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":10,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-12-14T18:10:06.000Z","date":"2020-12-10","kind":"sale","acquired":false,"shares":18529,"price":75,"value":1389675.0,"ownership":{"direct":true},"footnotes":[{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F4","text":"Represents shares held directly by Berkshire Investors IV LLC. Berkshire Investors IV LLC may be deemed to be, but does not admit to being, a member of a group holding over 10% of the outstanding common stock of the Issuer for purposes of Section 13(d)(3) of the Act."}],"balance_after":116313,"source":{"system":"sec-edgar","filing":"0000919574-20-007512","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420007512/ownership.xml","form_type":"4"}},{"id":2946631,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":2,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":3,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":4,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":5,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":6,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":7,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":8,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":9,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":10,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-12-14T18:10:06.000Z","date":"2020-12-10","kind":"sale","acquired":false,"shares":22598,"price":75,"value":1694850.0,"ownership":{"direct":true},"footnotes":[{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"Represents shares held directly by Berkshire Investors III LLC. Berkshire Investors III LLC may be deemed to be, but does not admit to being, a member of a group holding over 10% of the outstanding common stock of the Issuer for purposes of Section 13(d)(3) of the Act."}],"balance_after":120759,"source":{"system":"sec-edgar","filing":"0000919574-20-007512","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420007512/ownership.xml","form_type":"4"}},{"id":2946630,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":2,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":3,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":4,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":5,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":6,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":7,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":8,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":9,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":10,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-12-14T18:10:06.000Z","date":"2020-12-10","kind":"sale","acquired":false,"shares":1628873,"price":75,"value":122165475.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 5,098,435 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,088,564 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,062,018 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 8,403 shares of the Issuer's common stock, and SP holds 340,860 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":10598280,"source":{"system":"sec-edgar","filing":"0000919574-20-007512","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420007512/ownership.xml","form_type":"4"}},{"id":2975226,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-11-18T17:43:14.000Z","date":"2020-11-18","kind":"sale","acquired":false,"shares":55736,"price":64.1941,"value":3577922.3576,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions within the range of $64.0000 to $64.5200. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,123 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,083 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,344,977 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 9,230 shares of the Issuer's common stock, and SP holds 393,740 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12227153,"source":{"system":"sec-edgar","filing":"0000919574-20-007248","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420007248/ownership.xml","form_type":"4"}},{"id":2975225,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-11-18T17:43:14.000Z","date":"2020-11-17","kind":"sale","acquired":false,"shares":50000,"price":64.1355,"value":3206775.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions within the range of $64.0000 to $64.2550. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,123 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,083 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,344,977 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 9,230 shares of the Issuer's common stock, and SP holds 393,740 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12282889,"source":{"system":"sec-edgar","filing":"0000919574-20-007248","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420007248/ownership.xml","form_type":"4"}},{"id":2975224,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-11-18T17:43:14.000Z","date":"2020-11-16","kind":"sale","acquired":false,"shares":65000,"price":65.5508,"value":4260802.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions within the range of $65.0570 to $65.8500. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,123 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,083 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,344,977 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 9,230 shares of the Issuer's common stock, and SP holds 393,740 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12332889,"source":{"system":"sec-edgar","filing":"0000919574-20-007248","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420007248/ownership.xml","form_type":"4"}},{"id":2975223,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-11-18T17:43:14.000Z","date":"2020-11-16","kind":"sale","acquired":false,"shares":25000,"price":64.4996,"value":1612490.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions within the range of $64.0570 to $65.0569. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,123 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,083 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,344,977 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 9,230 shares of the Issuer's common stock, and SP holds 393,740 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12397889,"source":{"system":"sec-edgar","filing":"0000919574-20-007248","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420007248/ownership.xml","form_type":"4"}},{"id":2981374,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-11-13T19:42:19.000Z","date":"2020-11-13","kind":"sale","acquired":false,"shares":18820,"price":64.1464,"value":1207235.248,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions within the range of $64.0470 to $64.2600. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,123 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,083 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,344,977 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 9,846 shares of the Issuer's common stock, and SP holds 607,680 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12422889,"source":{"system":"sec-edgar","filing":"0000919574-20-007016","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420007016/ownership.xml","form_type":"4"}},{"id":2981373,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-11-13T19:42:19.000Z","date":"2020-11-12","kind":"sale","acquired":false,"shares":800,"price":64,"value":51200.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,123 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,083 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,344,977 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 9,846 shares of the Issuer's common stock, and SP holds 607,680 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12441709,"source":{"system":"sec-edgar","filing":"0000919574-20-007016","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420007016/ownership.xml","form_type":"4"}},{"id":2981372,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-11-13T19:42:19.000Z","date":"2020-11-11","kind":"sale","acquired":false,"shares":43800,"price":65.3803,"value":2863657.14,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions within the range of $65.3200 to $65.5300. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,123 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,083 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,344,977 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 9,846 shares of the Issuer's common stock, and SP holds 607,680 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12442509,"source":{"system":"sec-edgar","filing":"0000919574-20-007016","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420007016/ownership.xml","form_type":"4"}},{"id":2981371,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-11-13T19:42:19.000Z","date":"2020-11-11","kind":"sale","acquired":false,"shares":76200,"price":64.9251,"value":4947292.62,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions within the range of $64.3200 to $65.3199. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,123 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,083 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,344,977 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 9,846 shares of the Issuer's common stock, and SP holds 607,680 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12486309,"source":{"system":"sec-edgar","filing":"0000919574-20-007016","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420007016/ownership.xml","form_type":"4"}},{"id":3110577,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-06-15T10:37:44.000Z","date":"2020-06-11","kind":"purchase","acquired":true,"shares":1,"price":43.71,"value":43.71,"ownership":{"direct":true},"footnotes":[{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F4","text":"Represents shares held directly by Berkshire Investors IV LLC. Berkshire Investors IV LLC may be deemed to be, but does not admit to being, a member of a group holding over 10% of the outstanding common stock of the Issuer for purposes of Section 13(d)(3) of the Act."}],"balance_after":134842,"source":{"system":"sec-edgar","filing":"0000919574-20-004114","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420004114/ownership.xml","form_type":"4"}},{"id":3110576,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-06-15T10:37:44.000Z","date":"2020-06-11","kind":"purchase","acquired":true,"shares":1,"price":43.71,"value":43.71,"ownership":{"direct":true},"footnotes":[{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"Represents shares held directly by Berkshire Investors III LLC. Berkshire Investors III LLC may be deemed to be, but does not admit to being, a member of a group holding over 10% of the outstanding common stock of the Issuer for purposes of Section 13(d)(3) of the Act."}],"balance_after":143357,"source":{"system":"sec-edgar","filing":"0000919574-20-004114","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420004114/ownership.xml","form_type":"4"}},{"id":3110575,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-06-15T10:37:44.000Z","date":"2020-06-11","kind":"purchase","acquired":true,"shares":48,"price":43.71,"value":2098.08,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,123 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,083 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,344,977 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 10,192 shares of the Issuer's common stock, and SP holds 728,134 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12562509,"source":{"system":"sec-edgar","filing":"0000919574-20-004114","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957420004114/ownership.xml","form_type":"4"}},{"id":3396672,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-10-07T19:05:23.000Z","date":"2019-10-04","kind":"purchase","acquired":true,"shares":9373,"price":32.9718,"value":309044.6814,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"The purchase reported on this Form 4 was effective pursuant to a Rule 10b5-1 trading plan adopted by SF and SARF on September 13, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions within the range of $32.8100 to $33.0000. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,089 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,069 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,344,977 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 10,192 shares of the Issuer's common stock, and SP holds 728,134 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12562461,"source":{"system":"sec-edgar","filing":"0000919574-19-006273","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957419006273/ownership.xml","form_type":"4"}},{"id":3396671,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-10-07T19:05:23.000Z","date":"2019-10-04","kind":"purchase","acquired":true,"shares":2237,"price":32.4116,"value":72504.7492,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"The purchase reported on this Form 4 was effective pursuant to a Rule 10b5-1 trading plan adopted by SF and SARF on September 13, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions within the range of $31.8100 to $32.8099. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,089 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,069 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,344,977 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 10,192 shares of the Issuer's common stock, and SP holds 728,134 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12553088,"source":{"system":"sec-edgar","filing":"0000919574-19-006273","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957419006273/ownership.xml","form_type":"4"}},{"id":3396670,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-10-07T19:05:23.000Z","date":"2019-10-03","kind":"purchase","acquired":true,"shares":85400,"price":31.4379,"value":2684796.66,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"The purchase reported on this Form 4 was effective pursuant to a Rule 10b5-1 trading plan adopted by SF and SARF on September 13, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions within the range of $31.2300 to $31.7200. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,089 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,069 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,344,977 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 10,192 shares of the Issuer's common stock, and SP holds 728,134 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12550851,"source":{"system":"sec-edgar","filing":"0000919574-19-006273","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957419006273/ownership.xml","form_type":"4"}},{"id":3398590,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-10-03T17:15:26.000Z","date":"2019-10-02","kind":"purchase","acquired":true,"shares":140458,"price":31.5723,"value":4434582.1134,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"The purchase reported on this Form 4 was effective pursuant to a Rule 10b5-1 trading plan adopted by SF and SARF on September 13, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions within the range of $31.3800 to $31.9700. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,089 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,069 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,248,261 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 9,898 shares of the Issuer's common stock, and SP holds 728,134 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12465451,"source":{"system":"sec-edgar","filing":"0000919574-19-006205","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957419006205/ownership.xml","form_type":"4"}},{"id":3398589,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-10-03T17:15:26.000Z","date":"2019-10-01","kind":"purchase","acquired":true,"shares":1300,"price":32.9815,"value":42875.95,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"The purchase reported on this Form 4 was effective pursuant to a Rule 10b5-1 trading plan adopted by SF and SARF on September 13, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions within the range of $32.9700 to $32.9900. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,089 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,069 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,248,261 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 9,898 shares of the Issuer's common stock, and SP holds 728,134 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":12324993,"source":{"system":"sec-edgar","filing":"0000919574-19-006205","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957419006205/ownership.xml","form_type":"4"}},{"id":3398588,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-10-03T17:15:26.000Z","date":"2019-10-01","kind":"purchase","acquired":true,"shares":88115,"price":32.2652,"value":2843048.098,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"The purchase reported on this Form 4 was effective pursuant to a Rule 10b5-1 trading plan adopted by SF and SARF on September 13, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions within the range of $31.9700 to $32.9699. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 6,015,089 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 2,464,069 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. 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Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). 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(f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,019,087 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 9,199 shares of the Issuer's common stock and SP holds 728,134 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":6719944,"source":{"system":"sec-edgar","filing":"0000919574-17-005768","document":"pwms8717-4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957417005768/pwms8717-4.xml","form_type":"4"}},{"id":4241346,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-08-07T20:03:50.000Z","date":"2017-08-03","kind":"purchase","acquired":true,"shares":17645,"price":19.1927,"value":338655.1915,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions within the range of $18.9000 to $19.8500. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F4","text":"Represents shares held directly by Berkshire Investors IV LLC. Berkshire Investors IV LLC may be deemed to be, but does not admit to being, a member of a group holding over 10% of the outstanding common stock of the Issuer for purposes of Section 13(d)(3) of the Act."}],"balance_after":51476,"source":{"system":"sec-edgar","filing":"0000919574-17-005768","document":"pwms8717-4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957417005768/pwms8717-4.xml","form_type":"4"}},{"id":4241345,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-08-07T20:03:50.000Z","date":"2017-08-03","kind":"purchase","acquired":true,"shares":17188,"price":19.1927,"value":329884.1276,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions within the range of $18.9000 to $19.8500. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"Represents shares held directly by Berkshire Investors III LLC. Berkshire Investors III LLC may be deemed to be, but does not admit to being, a member of a group holding over 10% of the outstanding common stock of the Issuer for purposes of Section 13(d)(3) of the Act."}],"balance_after":54041,"source":{"system":"sec-edgar","filing":"0000919574-17-005768","document":"pwms8717-4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957417005768/pwms8717-4.xml","form_type":"4"}},{"id":4241344,"issuer":{"id":2328,"kind":"organization","name":"ADVANCED DRAINAGE SYSTEMS, INC.","symbol":"WMS"},"owners":[{"id":79479,"kind":"person","name":"Berkshire Partners Holdings LLC","position":1,"cik":"0001597786","reported_name":"Berkshire Partners Holdings LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79480,"kind":"person","name":"BPSP, L.P.","position":2,"cik":"0001597787","reported_name":"BPSP, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79473,"kind":"person","name":"Berkshire Partners LLC","position":3,"cik":"0001312988","reported_name":"Berkshire Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118010,"kind":"organization","name":"Stockbridge Partners LLC","position":4,"cik":"0001505183","reported_name":"Stockbridge Partners LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132296,"kind":"organization","name":"Berkshire Fund IX, L.P.","position":5,"cik":"0001658315","reported_name":"Berkshire Fund IX, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132297,"kind":"organization","name":"Berkshire Fund IX-A, L.P.","position":6,"cik":"0001658319","reported_name":"Berkshire Fund IX-A, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132298,"kind":"organization","name":"Stockbridge Fund, L.P.","position":7,"cik":"0001501625","reported_name":"Stockbridge Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":132299,"kind":"organization","name":"Stockbridge Absolute Return Fund, L.P.","position":8,"cik":"0001505182","reported_name":"Stockbridge Absolute Return Fund, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79476,"kind":"person","name":"Berkshire Investors III LLC","position":9,"cik":"0001505184","reported_name":"Berkshire Investors III LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":79477,"kind":"person","name":"Berkshire Investors IV LLC","position":10,"cik":"0001505185","reported_name":"Berkshire Investors IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-08-07T20:03:50.000Z","date":"2017-08-03","kind":"purchase","acquired":true,"shares":1157258,"price":19.1927,"value":22210905.6166,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions within the range of $18.9000 to $19.8500. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC (\"BPH\"), BPSP, L.P. (\"BPSP\"), Stockbridge Partners LLC (\"SP\") and Berkshire Partners LLC (\"BP\"). Berkshire Fund IX, L.P. (\"BF IX\") holds 3,614,444 shares of the Issuer's common stock, and Berkshire Fund IX-A, L.P. (\"BF IX-A\") holds 1,480,649 shares of the Issuer's common stock. Ninth Berkshire Associates LLC (\"9BA\") is the general partner of BF IX and BF IX-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) (\"SF\") holds 3,019,087 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. (\"SARF\") holds 9,199 shares of the Issuer's common stock and SP holds 728,134 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC (\"SA\") is the general partner of SF and SARF."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF IX and BF IX-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 9BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the \"Act\"). Each of BPH, BPSP, BP, SP, 9BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein."}],"balance_after":6654056,"source":{"system":"sec-edgar","filing":"0000919574-17-005768","document":"pwms8717-4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1658315/000091957417005768/pwms8717-4.xml","form_type":"4"}}]}