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The number of shares withheld was determined based on the actual sale price of shares sold on June 9, 2026 pursuant to a sell-to-cover transaction."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes unvested RSUs."}],"balance_after":252077,"source":{"system":"sec-edgar","filing":"0001998251-26-000004","document":"wk-form4_1781038775.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000199825126000004/wk-form4_1781038775.xml","form_type":"4"}},{"id":849044,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":40125,"kind":"person","name":"Miller Melissa F. (Missy)","position":1,"cik":"0001998251","reported_name":"Miller Melissa F. 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Each RSU represents a contingent right to receive one share of common stock, $0.01 par value per share (the \"Common Stock\") upon settlement."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes unvested RSUs."}],"balance_after":254964,"source":{"system":"sec-edgar","filing":"0001998251-26-000002","document":"wk-form4_1773269097.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000199825126000002/wk-form4_1773269097.xml","form_type":"4"}},{"id":987345,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":40125,"kind":"person","name":"Miller Melissa F. (Missy)","position":1,"cik":"0001998251","reported_name":"Miller Melissa F. 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(Missy)","position":1,"cik":"0001998251","reported_name":"Miller Melissa F. 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(Missy)","position":1,"cik":"0001998251","reported_name":"Miller Melissa F. (Missy)","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Marketing Officer"}}],"security":"Common Stock","published_at":"2025-08-28T21:02:51.000Z","date":"2025-08-26","kind":"sale","planned":true,"acquired":false,"shares":3400,"price":37.0095,"value":125832.3,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares of common stock, par value $0.01 per share (\"Common Stock\") of Waystar Holding Corp. (the \"Issuer\") were sold in multiple transactions ranging from $37.00 to $37.03, inclusive. 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 of Common Stock sold at each separate price in the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on November 20, 2024 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes unvested RSUs."}],"balance_after":193261,"source":{"system":"sec-edgar","filing":"0001998251-25-000006","document":"wk-form4_1756414968.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000199825125000006/wk-form4_1756414968.xml","form_type":"4"}},{"id":1053758,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":40125,"kind":"person","name":"Miller Melissa F. (Missy)","position":1,"cik":"0001998251","reported_name":"Miller Melissa F. 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In addition, the total number of shares beneficially owned following the reported transaction reflects a correction to prior filings to account for an earlier misclassification of an option exercise. The ending balance reported herein is accurate and reflects the Reporting Person's current holdings."}],"balance_after":193261,"source":{"system":"sec-edgar","filing":"0001998251-25-000006","document":"wk-form4_1756414968.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000199825125000006/wk-form4_1756414968.xml","form_type":"4"}},{"id":1053756,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":40125,"kind":"person","name":"Miller Melissa F. (Missy)","position":1,"cik":"0001998251","reported_name":"Miller Melissa F. 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This amendment adds the previously unreported option exercise transaction and restates the sell of shares reported in the Original Form 4 in a single combined row, consistent with other filings for the Reporting Owner. No other changes have been made to the Original Form 4."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Options granted August 17, 2020 of which 50% of the option vests in five substantially equal annual installments commencing on August 17, 2021 and the remaining 50% of the option vests upon achievement of certain specified performance-based vesting criteria."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on November 20, 2024 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c)."}],"balance_after":35550,"derivative":{"exercise_price":18.19,"expiration_date":"2030-08-17","underlying":"Common Stock","underlying_shares":3400},"source":{"system":"sec-edgar","filing":"0001998251-25-000004","document":"wk-form4a_1756414855.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000199825125000004/wk-form4a_1756414855.xml","form_type":"4/A","original_submission_date":"2025-05-16"}},{"id":1053755,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":40125,"kind":"person","name":"Miller Melissa F. 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This amendment adds the previously unreported option exercise transaction and restates the sell of shares reported in the Original Form 4 in a single combined row, consistent with other filings for the Reporting Owner. No other changes have been made to the Original Form 4."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares of common stock, par value $0.01 per share (\"Common Stock\") of Waystar Holding Corp. (the \"Issuer\") were sold in multiple transactions ranging from $38.89 to $40.06, inclusive. 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 of Common Stock sold at each separate price in the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on November 20, 2024 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes unvested RSUs."}],"balance_after":201956,"source":{"system":"sec-edgar","filing":"0001998251-25-000004","document":"wk-form4a_1756414855.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000199825125000004/wk-form4a_1756414855.xml","form_type":"4/A","original_submission_date":"2025-05-16"}},{"id":1053754,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":40125,"kind":"person","name":"Miller Melissa F. 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This amendment adds the previously unreported option exercise transaction and restates the sell of shares reported in the Original Form 4 in a single combined row, consistent with other filings for the Reporting Owner. No other changes have been made to the Original Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on November 20, 2024 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes unvested RSUs."}],"balance_after":205356,"source":{"system":"sec-edgar","filing":"0001998251-25-000004","document":"wk-form4a_1756414855.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000199825125000004/wk-form4a_1756414855.xml","form_type":"4/A","original_submission_date":"2025-05-16"}},{"id":1113773,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":40125,"kind":"person","name":"Miller Melissa F. 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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 of Common Stock sold at each separate price in the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on November 20, 2024 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes unvested RSU's."}],"balance_after":192484,"source":{"system":"sec-edgar","filing":"0001104659-25-058881","document":"tm2517879-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000110465925058881/tm2517879-2_4seq1.xml","form_type":"4"}},{"id":1145712,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":40125,"kind":"person","name":"Miller Melissa F. 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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 of Common Stock sold at each separate price in the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on November 20, 2024 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes unvested RSUs."}],"balance_after":198656,"source":{"system":"sec-edgar","filing":"0001104659-25-049882","document":"tm2515316-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000110465925049882/tm2515316-1_4seq1.xml","form_type":"4"}},{"id":1180199,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":40125,"kind":"person","name":"Miller Melissa F. 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Each RSU represents a contingent right to receive one share of common stock, $0.01 par value per share (the \"Common Stock\") upon settlement."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes unvested RSUs."}],"balance_after":201956,"source":{"system":"sec-edgar","filing":"0001104659-25-031491","document":"tm2511308d4_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000110465925031491/tm2511308d4_4seq1.xml","form_type":"4"}},{"id":1246834,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":40125,"kind":"person","name":"Miller Melissa F. (Missy)","position":1,"cik":"0001998251","reported_name":"Miller Melissa F. 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