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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":"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 BCPE Derby Investor, LP (\"Derby Investor\") and (ii) sole member of BCPE Derby (DE) SPV, LLC (\"Derby SPV GP\"), which is the general partner of BCPE Derby (DE) SPV, LP (\"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) As a result, the Bain Capital Entities 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 Derby Investor and Derby SPV Investor. The Bain Capital Entities disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein."}],"balance_after":13243539,"source":{"system":"sec-edgar","filing":"0001193125-25-205034","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1040508/000119312525205034/ownership.xml","form_type":"4"}},{"id":1040000,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":52008,"kind":"organization","name":"Bain Capital Investors LLC","position":1,"cik":"0001040508","reported_name":"BAIN CAPITAL INVESTORS LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75354,"kind":"organization","name":"BCPE Derby Investor, LP","position":2,"cik":"0002025342","reported_name":"BCPE Derby Investor, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75355,"kind":"organization","name":"BCPE Derby GP, LLC","position":3,"cik":"0002025234","reported_name":"BCPE Derby GP, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75356,"kind":"organization","name":"Bain Capital Fund XI, L.P.","position":4,"cik":"0001568889","reported_name":"Bain Capital Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75357,"kind":"organization","name":"Bain Capital Partners XI, L.P.","position":5,"cik":"0001851748","reported_name":"Bain Capital Partners XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75358,"kind":"organization","name":"BCPE Derby (DE) SPV, LP","position":6,"cik":"0002048434","reported_name":"BCPE Derby (DE) SPV, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75359,"kind":"organization","name":"BCPE Derby (DE) SPV (GP), LLC","position":7,"cik":"0002048242","reported_name":"BCPE Derby (DE) SPV (GP), LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, par value $0.01 per share","published_at":"2025-09-16T20:30:08.000Z","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":"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 BCPE Derby Investor, LP (\"Derby Investor\") and (ii) sole member of BCPE Derby (DE) SPV, LLC (\"Derby SPV GP\"), which is the general partner of BCPE Derby (DE) SPV, LP (\"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) As a result, the Bain Capital Entities 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 Derby Investor and Derby SPV Investor. The Bain Capital Entities disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein."}],"balance_after":13759910,"source":{"system":"sec-edgar","filing":"0001193125-25-205034","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1040508/000119312525205034/ownership.xml","form_type":"4"}},{"id":1039517,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":75302,"kind":"organization","name":"Derby LuxCo S.a r.l.","position":1,"cik":"0001998443","reported_name":"Derby LuxCo S.a r.l.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":72284,"kind":"organization","name":"EQT Fund Management S.a r.l.","position":2,"cik":"0001834239","reported_name":"EQT Fund Management S.a r.l.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-09-16T20:30:06.000Z","date":"2025-09-12","kind":"sale","planned":false,"acquired":false,"shares":7766088,"price":39.21,"value":304508310.48,"ownership":{"direct":false,"nature":"Held directly by Derby LuxCo"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This amount represents the $39.21 sale price per share of Common Stock, par value $0.01 per share, in a secondary offering, which closed on September 12, 2025."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Consists of shares of common stock held directly by Derby LuxCo S.a r.l. (\"Derby LuxCo\"). Several investment vehicles collectively make up the fund known as \"EQT VIII.\" EQT VIII owns 100% of the membership interests in Derby LuxCo. EQT Fund Management S.a r.l. (\"EFMS\") has exclusive responsibility for the management and control of the business and affairs of investment vehicles which constitute the majority of the total commitments to EQT VIII. EFMS is overseen by a board of not less than three individuals that acts by majority approval."}],"balance_after":24879437,"source":{"system":"sec-edgar","filing":"0001193125-25-205033","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000119312525205033/ownership.xml","form_type":"4"}}],"next_cursor":"2025-09-16T20:30:06.000000Z,1039517"}