{"transactions":[{"id":1039520,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":75303,"kind":"person","name":"Moskowitz Paul G","position":1,"cik":"0001997404","reported_name":"Moskowitz Paul G","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, par value $0.01 per share","published_at":"2025-09-16T16:30:10.000Z","date":"2025-09-12","kind":"other","planned":false,"acquired":false,"shares":516371,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"On September 12, 2025, Derby Investor distributed 397,013 shares of Common Stock and Derby SPV Investor distributed 119,358 shares of Common Stock to one or more of their respective members or partners in connection with certain charitable gifts made by such members or partners or their direct or indirect owners. Such shares of Common Stock are subject to lock-up agreements that, subject to certain exceptions, restrict the sale of such shares until November 11, 2025 except with the prior written consent of J.P. Morgan Securities LLC."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"On September 12, 2025, Derby Investor distributed 397,013 shares of Common Stock and Derby SPV Investor distributed 119,358 shares of Common Stock to one or more of their respective members or partners in connection with certain charitable gifts made by such members or partners or their direct or indirect owners. Such shares of Common Stock are subject to lock-up agreements that, subject to certain exceptions, restrict the sale of such shares until November 11, 2025 except with the prior written consent of J.P. Morgan Securities LLC."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares held by BCPE Derby Investor, LP (\"Derby Investor\") and BCPE Derby (DE) SPV, LP (\"Derby SPV Investor\"). Bain Capital Investors, LLC (\"BCI\") is the manager of Bain Capital Partners XI, L.P. (\"Partners XI\"), which is the general partner of Bain Capital Fund XI, L.P. (\"Fund XI\"). Fund XI is the (i) sole member of BCPE Derby GP, LLC (\"Derby GP\"), which is the general partner of Derby Investor and (ii) sole member of BCPE Derby (DE) SPV, LLC (\"Derby SPV GP\" and, together with BCI, Partners XI, Fund XI, Derby GP, Derby Investor and Derby SPV Investor, the \"Bain Capital Entities\"), which is the general partner of Derby SPV Investor."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from footnote 1) Paul G Moskowitz, a member of the board of directors of Waystar Holding Corp. (the \"Issuer\"), is a Partner of BCI. By virtue of the relationships described in this footnote, Mr. Moskowitz may be deemed to share voting and dispositive power with respect to the shares of the Issuer's common stock, par value $0.01 per share (the \"Common Stock\"), held by the Bain Capital Entities. Mr. Moskowitz disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein."}],"balance_after":13243539,"source":{"system":"sec-edgar","filing":"0000950130-25-000135","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1997404/000095013025000135/ownership.xml","form_type":"4"}},{"id":1039519,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":75303,"kind":"person","name":"Moskowitz Paul G","position":1,"cik":"0001997404","reported_name":"Moskowitz Paul G","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, par value $0.01 per share","published_at":"2025-09-16T16:30:10.000Z","date":"2025-09-12","kind":"sale","planned":false,"acquired":false,"shares":4295139,"price":39.21,"value":168412400.19,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"Pursuant to a registered public offering that closed on September 12, 2025, 298,303 shares of Common Stock were sold by Derby Investor and 3,996,836 shares of Common Stock were sold by Derby SPV Investor at a price of $39.21 (net of underwriting discount)."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Pursuant to a registered public offering that closed on September 12, 2025, 298,303 shares of Common Stock were sold by Derby Investor and 3,996,836 shares of Common Stock were sold by Derby SPV Investor at a price of $39.21 (net of underwriting discount)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares held by BCPE Derby Investor, LP (\"Derby Investor\") and BCPE Derby (DE) SPV, LP (\"Derby SPV Investor\"). Bain Capital Investors, LLC (\"BCI\") is the manager of Bain Capital Partners XI, L.P. (\"Partners XI\"), which is the general partner of Bain Capital Fund XI, L.P. (\"Fund XI\"). Fund XI is the (i) sole member of BCPE Derby GP, LLC (\"Derby GP\"), which is the general partner of Derby Investor and (ii) sole member of BCPE Derby (DE) SPV, LLC (\"Derby SPV GP\" and, together with BCI, Partners XI, Fund XI, Derby GP, Derby Investor and Derby SPV Investor, the \"Bain Capital Entities\"), which is the general partner of Derby SPV Investor."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from footnote 1) Paul G Moskowitz, a member of the board of directors of Waystar Holding Corp. (the \"Issuer\"), is a Partner of BCI. By virtue of the relationships described in this footnote, Mr. Moskowitz may be deemed to share voting and dispositive power with respect to the shares of the Issuer's common stock, par value $0.01 per share (the \"Common Stock\"), held by the Bain Capital Entities. Mr. Moskowitz disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein."}],"balance_after":13759910,"source":{"system":"sec-edgar","filing":"0000950130-25-000135","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1997404/000095013025000135/ownership.xml","form_type":"4"}},{"id":1140692,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":75303,"kind":"person","name":"Moskowitz Paul G","position":1,"cik":"0001997404","reported_name":"Moskowitz Paul G","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, par value $0.01 per share","published_at":"2025-05-20T20:03:05.000Z","date":"2025-05-20","kind":"sale","planned":false,"acquired":false,"shares":451837,"price":37.39,"value":16894185.43,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"In connection with the exercise of the underwriters' option to purchase additional shares of Common Stock in a registered public offering that closed on May 20, 2025, 65,295 shares of Common Stock were sold by Derby Investor and 386,542 shares of Common Stock were sold by Derby SPV Investor at a price of $37.3937 (net of underwriting discount)."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"In connection with the exercise of the underwriters' option to purchase additional shares of Common Stock in a registered public offering that closed on May 20, 2025, 65,295 shares of Common Stock were sold by Derby Investor and 386,542 shares of Common Stock were sold by Derby SPV Investor at a price of $37.3937 (net of underwriting discount)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares held by BCPE Derby Investor, LP (\"Derby Investor\") and BCPE Derby (DE) SPV, LP (\"Derby SPV Investor\"). Bain Capital Investors, LLC (\"BCI\") is the manager of Bain Capital Partners XI, L.P. (\"Partners XI\"), which is the general partner of Bain Capital Fund XI, L.P. (\"Fund XI\"). Fund XI is the (i) sole member of BCPE Derby GP, LLC (\"Derby GP\"), which is the general partner of Derby Investor and (ii) sole member of BCPE Derby (DE) SPV, LLC (\"Derby SPV GP\" and, together with BCI, Partners XI, Fund XI, Derby GP, Derby Investor and Derby SPV Investor, the \"Bain Capital Entities\"), which is the general partner of Derby SPV Investor."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from footnote 1) Paul G Moskowitz, a member of the board of directors of Waystar Holding Corp. (the \"Issuer\"), is a Partner of BCI. By virtue of the relationships described in this footnote, Mr. Moskowitz may be deemed to share voting and dispositive power with respect to the shares of the Issuer's common stock, par value $0.01 per share (the \"Common Stock\"), held by the Bain Capital Entities. Mr. Moskowitz disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein."}],"balance_after":18055049,"source":{"system":"sec-edgar","filing":"0000950170-25-075495","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1997404/000095017025075495/ownership.xml","form_type":"4"}},{"id":1140691,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":75303,"kind":"person","name":"Moskowitz Paul G","position":1,"cik":"0001997404","reported_name":"Moskowitz Paul G","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, par value $0.01 per share","published_at":"2025-05-20T20:03:05.000Z","date":"2025-05-16","kind":"other","planned":false,"acquired":false,"shares":235397,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"On May 16, 2025, Derby Investor distributed 235,397 shares of Common Stock to one or more of its members or partners in connection with certain charitable gifts made by such members or partners or their direct or indirect owners."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"On May 16, 2025, Derby Investor distributed 235,397 shares of Common Stock to one or more of its members or partners in connection with certain charitable gifts made by such members or partners or their direct or indirect owners."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares held by BCPE Derby Investor, LP (\"Derby Investor\") and BCPE Derby (DE) SPV, LP (\"Derby SPV Investor\"). Bain Capital Investors, LLC (\"BCI\") is the manager of Bain Capital Partners XI, L.P. (\"Partners XI\"), which is the general partner of Bain Capital Fund XI, L.P. (\"Fund XI\"). Fund XI is the (i) sole member of BCPE Derby GP, LLC (\"Derby GP\"), which is the general partner of Derby Investor and (ii) sole member of BCPE Derby (DE) SPV, LLC (\"Derby SPV GP\" and, together with BCI, Partners XI, Fund XI, Derby GP, Derby Investor and Derby SPV Investor, the \"Bain Capital Entities\"), which is the general partner of Derby SPV Investor."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from footnote 1) Paul G Moskowitz, a member of the board of directors of Waystar Holding Corp. (the \"Issuer\"), is a Partner of BCI. By virtue of the relationships described in this footnote, Mr. Moskowitz may be deemed to share voting and dispositive power with respect to the shares of the Issuer's common stock, par value $0.01 per share (the \"Common Stock\"), held by the Bain Capital Entities. Mr. Moskowitz disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein."}],"balance_after":18506886,"source":{"system":"sec-edgar","filing":"0000950170-25-075495","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1997404/000095017025075495/ownership.xml","form_type":"4"}},{"id":1140690,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":75303,"kind":"person","name":"Moskowitz Paul G","position":1,"cik":"0001997404","reported_name":"Moskowitz Paul G","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, par value $0.01 per share","published_at":"2025-05-20T20:03:05.000Z","date":"2025-05-16","kind":"sale","planned":false,"acquired":false,"shares":3012253,"price":37.39,"value":112628139.67,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"Pursuant to a registered public offering that closed on May 16, 2025, 233,925 shares of Common Stock were sold by Derby Investor and 2,778,328 shares of Common Stock were sold by Derby SPV Investor at a price of $37.3937 (net of underwriting discount)."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Pursuant to a registered public offering that closed on May 16, 2025, 233,925 shares of Common Stock were sold by Derby Investor and 2,778,328 shares of Common Stock were sold by Derby SPV Investor at a price of $37.3937 (net of underwriting discount)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares held by BCPE Derby Investor, LP (\"Derby Investor\") and BCPE Derby (DE) SPV, LP (\"Derby SPV Investor\"). Bain Capital Investors, LLC (\"BCI\") is the manager of Bain Capital Partners XI, L.P. (\"Partners XI\"), which is the general partner of Bain Capital Fund XI, L.P. (\"Fund XI\"). Fund XI is the (i) sole member of BCPE Derby GP, LLC (\"Derby GP\"), which is the general partner of Derby Investor and (ii) sole member of BCPE Derby (DE) SPV, LLC (\"Derby SPV GP\" and, together with BCI, Partners XI, Fund XI, Derby GP, Derby Investor and Derby SPV Investor, the \"Bain Capital Entities\"), which is the general partner of Derby SPV Investor."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from footnote 1) Paul G Moskowitz, a member of the board of directors of Waystar Holding Corp. (the \"Issuer\"), is a Partner of BCI. By virtue of the relationships described in this footnote, Mr. Moskowitz may be deemed to share voting and dispositive power with respect to the shares of the Issuer's common stock, par value $0.01 per share (the \"Common Stock\"), held by the Bain Capital Entities. Mr. Moskowitz disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein."}],"balance_after":18742283,"source":{"system":"sec-edgar","filing":"0000950170-25-075495","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1997404/000095017025075495/ownership.xml","form_type":"4"}},{"id":1243603,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":75303,"kind":"person","name":"Moskowitz Paul G","position":1,"cik":"0001997404","reported_name":"Moskowitz Paul G","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, par value $0.01 per share","published_at":"2025-02-26T20:00:52.000Z","date":"2025-02-24","kind":"other","planned":false,"acquired":false,"shares":573192,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"On February 24, 2025, Derby Investor distributed 347,013 shares of Common Stock and Derby SPV Investor distributed 226,179 shares of Common Stock to one or more of their respective members or partners in connection with certain charitable gifts made by such members or partners or their direct or indirect owners."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"On February 24, 2025, Derby Investor distributed 347,013 shares of Common Stock and Derby SPV Investor distributed 226,179 shares of Common Stock to one or more of their respective members or partners in connection with certain charitable gifts made by such members or partners or their direct or indirect owners."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares held by BCPE Derby Investor, LP (\"Derby Investor\") and BCPE Derby (DE) SPV, LP (\"Derby SPV Investor\"). Bain Capital Investors, LLC (\"BCI\") is the manager of Bain Capital Partners XI, L.P. (\"Partners XI\"), which is the general partner of Bain Capital Fund XI, L.P. (\"Fund XI\"). Fund XI is the (i) sole member of BCPE Derby GP, LLC (\"Derby GP\"), which is the general partner of Derby Investor and (ii) sole member of BCPE Derby (DE) SPV, LLC (\"Derby SPV GP\"), which is the general partner of Derby SPV Investor and, together with BCI, Partners XI, Fund XI, Derby GP, Derby Investor and Derby SPV GP, the \"Bain Capital Entities\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from footnote 1) Paul G Moskowitz, a member of the board of directors of Waystar Holding Corp. (the \"Issuer\"), is a Partner of BCI. By virtue of the relationships described in this footnote, Mr. Moskowitz may be deemed to share voting and dispositive power with respect to the shares of the Issuer's common stock, par value $0.01 per share (the \"Common Stock\"), held by the Bain Capital Entities. Mr. Moskowitz disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein."}],"balance_after":21754536,"source":{"system":"sec-edgar","filing":"0000950170-25-028175","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1997404/000095017025028175/ownership.xml","form_type":"4"}},{"id":1243602,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":75303,"kind":"person","name":"Moskowitz Paul G","position":1,"cik":"0001997404","reported_name":"Moskowitz Paul G","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, par value $0.01 per share","published_at":"2025-02-26T20:00:52.000Z","date":"2025-02-24","kind":"sale","planned":false,"acquired":false,"shares":5652689,"price":38.6,"value":218193795.4,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"Pursuant to a registered public offering that closed on February 24, 2025, 552,696 shares of Common Stock were sold by Derby Investor and 5,099,993 shares of Common Stock were sold by Derby SPV Investor at a price of $38.60 (net of underwriting discount)."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Pursuant to a registered public offering that closed on February 24, 2025, 552,696 shares of Common Stock were sold by Derby Investor and 5,099,993 shares of Common Stock were sold by Derby SPV Investor at a price of $38.60 (net of underwriting discount)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Represents shares held by BCPE Derby Investor, LP (\"Derby Investor\") and BCPE Derby (DE) SPV, LP (\"Derby SPV Investor\"). Bain Capital Investors, LLC (\"BCI\") is the manager of Bain Capital Partners XI, L.P. (\"Partners XI\"), which is the general partner of Bain Capital Fund XI, L.P. (\"Fund XI\"). Fund XI is the (i) sole member of BCPE Derby GP, LLC (\"Derby GP\"), which is the general partner of Derby Investor and (ii) sole member of BCPE Derby (DE) SPV, LLC (\"Derby SPV GP\"), which is the general partner of Derby SPV Investor and, together with BCI, Partners XI, Fund XI, Derby GP, Derby Investor and Derby SPV GP, the \"Bain Capital Entities\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"(Continued from footnote 1) Paul G Moskowitz, a member of the board of directors of Waystar Holding Corp. (the \"Issuer\"), is a Partner of BCI. By virtue of the relationships described in this footnote, Mr. Moskowitz may be deemed to share voting and dispositive power with respect to the shares of the Issuer's common stock, par value $0.01 per share (the \"Common Stock\"), held by the Bain Capital Entities. Mr. Moskowitz disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein."}],"balance_after":22327728,"source":{"system":"sec-edgar","filing":"0000950170-25-028175","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1997404/000095017025028175/ownership.xml","form_type":"4"}}]}