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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 $40.13 to $41.07, 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":"F1","text":"These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on November 22, 2024 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c)."}],"balance_after":764131,"source":{"system":"sec-edgar","filing":"0001104659-25-058576","document":"tm2517745-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000110465925058576/tm2517745-1_4seq1.xml","form_type":"4"}},{"id":1115266,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":1421,"kind":"person","name":"Hawkins Matthew J.","position":1,"cik":"0001998256","reported_name":"Hawkins Matthew J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-06-11T20:58:25.000Z","date":"2025-06-10","kind":"exercise","planned":true,"acquired":true,"shares":46667,"price":4.14,"value":193201.38,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on November 22, 2024 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c)."}],"balance_after":810798,"source":{"system":"sec-edgar","filing":"0001104659-25-058576","document":"tm2517745-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000110465925058576/tm2517745-1_4seq1.xml","form_type":"4"}},{"id":1119986,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":1421,"kind":"person","name":"Hawkins Matthew J.","position":1,"cik":"0001998256","reported_name":"Hawkins Matthew J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Stock Options (right to buy)","published_at":"2025-06-06T20:01:07.000Z","date":"2025-06-05","kind":"exercise","planned":false,"acquired":false,"shares":59836,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"These options are currently vested."}],"balance_after":1272881,"derivative":{"exercise_price":4.14,"expiration_date":"2027-11-01","underlying":"Common Stock","underlying_shares":59836},"source":{"system":"sec-edgar","filing":"0001104659-25-057293","document":"tm2517351-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000110465925057293/tm2517351-1_4seq1.xml","form_type":"4"}},{"id":1119985,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":1421,"kind":"person","name":"Hawkins Matthew J.","position":1,"cik":"0001998256","reported_name":"Hawkins Matthew J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-06-06T20:01:07.000Z","date":"2025-06-05","kind":"sale","planned":false,"acquired":false,"shares":59836,"price":40.1763,"value":2403989.0868,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","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 $40.10 to $40.43, 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 pursuant to broker sales conducted in accordance with Rule 144 under the Securities Act of 1933, as amended."}],"balance_after":764131,"source":{"system":"sec-edgar","filing":"0001104659-25-057293","document":"tm2517351-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000110465925057293/tm2517351-1_4seq1.xml","form_type":"4"}},{"id":1119984,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding 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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 22, 2024 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c)."}],"balance_after":500500,"source":{"system":"sec-edgar","filing":"0001104659-25-023981","document":"tm259049-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000110465925023981/tm259049-2_4seq1.xml","form_type":"4"}},{"id":1205935,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":1421,"kind":"person","name":"Hawkins Matthew J.","position":1,"cik":"0001998256","reported_name":"Hawkins Matthew J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-03-14T20:30:11.000Z","date":"2025-03-13","kind":"exercise","planned":true,"acquired":true,"shares":46665,"price":4.14,"value":193193.1,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on November 22, 2024 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c)."}],"balance_after":546665,"source":{"system":"sec-edgar","filing":"0001104659-25-023981","document":"tm259049-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000110465925023981/tm259049-2_4seq1.xml","form_type":"4"}},{"id":1482320,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":1421,"kind":"person","name":"Hawkins Matthew J.","position":1,"cik":"0001998256","reported_name":"Hawkins Matthew J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Stock Options (right to buy)","published_at":"2024-06-12T20:30:12.000Z","date":"2024-06-06","kind":"grant","planned":false,"acquired":true,"shares":1250000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"On June 6, 2024 reporting person was granted options to purchase shares of Common Stock which vest in five substantially equal annual installments commencing on June 6, 2025. Such securities were originally included on the Form 3 filed by the reporting person on June 7, 2024."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"On June 6, 2024 reporting person was granted options to purchase shares of Common Stock which vest in five substantially equal annual installments commencing on June 6, 2025. Such securities were originally included on the Form 3 filed by the reporting person on June 7, 2024."}],"balance_after":1250000,"derivative":{"exercise_price":21.5,"expiration_date":"2034-06-06","underlying":"Common Stock","underlying_shares":1250000},"source":{"system":"sec-edgar","filing":"0001104659-24-070865","document":"tm2416795-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000110465924070865/tm2416795-1_4seq1.xml","form_type":"4"}},{"id":1482319,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":1421,"kind":"person","name":"Hawkins Matthew J.","position":1,"cik":"0001998256","reported_name":"Hawkins Matthew J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Stock Options (right to buy)","published_at":"2024-06-12T20:30:12.000Z","date":"2024-05-01","kind":"grant","planned":false,"acquired":true,"shares":145200,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"On May 1, 2024 reporting person was granted options to purchase shares of Common Stock which vest in three substantially equal annual installments commencing on May 1, 2025. Such securities were originally included on the Form 3 filed by the reporting person on June 7, 2024. Reflects the 0.605-for-1 reverse stock split which became effective on May 15, 2024."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"On May 1, 2024 reporting person was granted options to purchase shares of Common Stock which vest in three substantially equal annual installments commencing on May 1, 2025. Such securities were originally included on the Form 3 filed by the reporting person on June 7, 2024. Reflects the 0.605-for-1 reverse stock split which became effective on May 15, 2024."}],"balance_after":145200,"derivative":{"exercise_price":37.2,"expiration_date":"2034-05-01","underlying":"Common Stock","underlying_shares":145200},"source":{"system":"sec-edgar","filing":"0001104659-24-070865","document":"tm2416795-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000110465924070865/tm2416795-1_4seq1.xml","form_type":"4"}},{"id":1482318,"issuer":{"id":1420,"kind":"organization","name":"Waystar Holding Corp.","symbol":"WAY"},"owners":[{"id":1421,"kind":"person","name":"Hawkins Matthew J.","position":1,"cik":"0001998256","reported_name":"Hawkins Matthew J.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2024-06-12T20:30:12.000Z","date":"2024-06-10","kind":"grant","planned":false,"acquired":true,"shares":500000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Reflects a grant of restricted stock units (\"RSUs\") which vest in five substantially equal annual installments commencing on June 6, 2025. 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":500000,"source":{"system":"sec-edgar","filing":"0001104659-24-070865","document":"tm2416795-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1990354/000110465924070865/tm2416795-1_4seq1.xml","form_type":"4"}}]}