WAY

SEC source: 0001998256-26-000015 · wk-form4_1791403921.xml · derivative · entry 3

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,427,598

Underlying: Common Stock · 82,500 shares

Expires 2027-11-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: These options are currently vested.

SEC source: 0001998256-26-000015 · wk-form4_1791403921.xml · nonDerivative · entry 2

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,804,794

F3 · price: 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 $25.98 to $26.60, 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.

F1 · balance_after: Includes unvested RSUs.

F2 · balance_after: These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on March 13, 2026 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

SEC source: 0001998256-26-000015 · wk-form4_1791403921.xml · nonDerivative · entry 1

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,887,294

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes unvested RSUs.

F2 · balance_after: These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on March 13, 2026 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

SEC source: 0002091511-26-000004 · wk-form4_1791327022.xml · nonDerivative · entry 1

Chan William · CIK 0002091511 · Chief Product & AI Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,571,252

F1 · shares: The transaction represents shares of common stock withheld to pay taxes upon vesting of restricted stock units (RSUs) granted to the Reporting Person on October 2, 2025. The number of shares withheld was determined based on the actual sale price of shares sold on October 5, 2026 pursuant to a "sell-to-cover" transaction.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001998256-26-000013 · wk-form4_1788455712.xml · derivative · entry 4

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,510,098

Underlying: Common Stock · 82,500 shares

Expires 2027-11-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: These options are currently vested.

SEC source: 0001998256-26-000013 · wk-form4_1788455712.xml · nonDerivative · entry 3

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,804,794

F4 · price: 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 $25.51 to $26.51, 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.

F2 · balance_after: Includes unvested RSUs.

F3 · balance_after: These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on March 13, 2026 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

SEC source: 0001998256-26-000013 · wk-form4_1788455712.xml · nonDerivative · entry 2

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,887,294

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · balance_after: Includes unvested RSUs.

F3 · balance_after: These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on March 13, 2026 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

SEC source: 0001735839-26-000006 · wk-form4_1788455842.xml · nonDerivative · entry 1

PACKER GREGORY R · CIK 0001735839 · Chief Legal officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 418,255

F1 · shares: The transaction represents shares of common stock withheld to pay taxes upon vesting of restricted stock units (RSUs) granted to the Reporting Person on August 18, 2025. The number of shares withheld was determined based on the actual sale price of shares sold on September 1, 2026 pursuant to a "sell-to-cover" transaction. The vesting schedule for this RSU grant, as originally reported on the Reporting Person's prior Form 4, was modified by the Talent & Compensation Committee. The original vesting schedule provided for 40% vesting on the third anniversary of the Vesting Commencement Date and 60% vesting on the fourth anniversary of the Vesting Commencement Date. The modified vesting schedule provides for 25% vesting on September 1, 2026, and 25% vesting on each of the second, third, and fourth anniversaries of the Vesting Commencement Date.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001998332-26-000008 · wk-form4_1788455785.xml · nonDerivative · entry 1

Bridge T. Craig · CIK 0001998332 · Chief Transformation Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 833,234

F1 · shares: The transaction represents shares of common stock withheld to pay taxes upon vesting of restricted stock units (RSUs) granted to the Reporting Person on April 1, 2025. The number of shares withheld was determined based on the actual sale price of shares sold on September 1, 2026 pursuant to a "sell-to-cover" transaction. The vesting schedule for this RSU grant, as originally reported on the Reporting Person's prior Form 4, was modified by the Talent & Compensation Committee. The original vesting schedule provided for 40% vesting on the third anniversary of the Vesting Commencement Date and 60% vesting on the fourth anniversary of the Vesting Commencement Date. The modified vesting schedule provides for 25% vesting on September 1, 2026, and 25% vesting on each of the second, third, and fourth anniversaries of the Vesting Commencement Date.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001998256-26-000013 · wk-form4_1788455712.xml · nonDerivative · entry 1

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,804,794

F1 · shares: The transaction represents shares of common stock withheld to pay taxes upon vesting of restricted stock units (RSUs) granted to the Reporting Person on April 1, 2025. The number of shares withheld was determined based on the actual sale price of shares sold on September 1, 2026 pursuant to a "sell-to-cover" transaction. The vesting schedule for this RSU grant, as originally reported on the Reporting Person's prior Form 4, was modified by the Talent & Compensation Committee. The original vesting schedule provided for 40% vesting on the third anniversary of the Vesting Commencement Date and 60% vesting on the fourth anniversary of the Vesting Commencement Date. The modified vesting schedule provides for 25% vesting on September 1, 2026, and 25% vesting on each of the second, third, and fourth anniversaries of the Vesting Commencement Date.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0002150055-26-000004 · wk-form4_1788897453.xml · nonDerivative · entry 1

Khanna Amit · CIK 0002150055 · Chief Prod. & Tech. Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 390,625

F1 · shares: Reflects a grant of restricted stock units ("RSUs") awarded on August 17, 2026. Subject to the reporting person's continued service through the applicable vesting date, 6.25% of the RSUs vest quarterly during the first 12 months following the grant date, and 25% of the RSUs vest on each August 17 thereafter through August 17, 2030. Each RSU represents a contingent right to receive one share of common stock, par value $0.01 per share ("Common Stock"), upon settlement.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001998256-26-000011 · wk-form4_1786657258.xml · derivative · entry 6

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,315,837

Underlying: Common Stock · 60,038 shares

Expires 2027-11-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: These options are currently vested.

SEC source: 0001998256-26-000011 · wk-form4_1786657258.xml · nonDerivative · entry 4

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,835,081

F4 · price: 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 $25.00 to $25.05, 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.

F1 · balance_after: Includes unvested RSUs.

F2 · balance_after: These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on March 13, 2026 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

SEC source: 0001998256-26-000011 · wk-form4_1786657258.xml · nonDerivative · entry 3

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,895,119

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes unvested RSUs.

F2 · balance_after: These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on March 13, 2026 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

SEC source: 0001998256-26-000011 · wk-form4_1786657258.xml · derivative · entry 5

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,375,875

Underlying: Common Stock · 22,462 shares

Expires 2027-11-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: These options are currently vested.

SEC source: 0001998256-26-000011 · wk-form4_1786657258.xml · nonDerivative · entry 2

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,835,081

F3 · price: 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 $25.00 to $25.08, 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.

F1 · balance_after: Includes unvested RSUs.

F2 · balance_after: These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on March 13, 2026 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

SEC source: 0001998256-26-000011 · wk-form4_1786657258.xml · nonDerivative · entry 1

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,857,543

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes unvested RSUs.

F2 · balance_after: These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on March 13, 2026 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

SEC source: 0001735839-26-000004 · wk-form4_1785786264.xml · nonDerivative · entry 2

PACKER GREGORY R · CIK 0001735839 · Chief Legal officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 425,009

F3 · shares: Reflects a grant of restricted stock units ("RSUs") which vest over 2 years, with 12.5% vesting each quarter during year 1 and 50% vesting in year 2. Each RSU represents a contingent right to receive one share of common stock, $0.01 par value per share (the "Common Stock") upon settlement.

F1 · balance_after: Includes unvested RSUs.

SEC source: 0001998256-26-000009 · wk-form4_1785786205.xml · nonDerivative · entry 1

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,835,081

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest in three equal annual installments from the initial grant date. Each RSU represents a contingent right to receive one share of common stock, $0.01 par value per share (the "Common Stock") upon settlement.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001998332-26-000006 · wk-form4_1785786142.xml · nonDerivative · entry 1

Bridge T. Craig · CIK 0001998332 · Chief Transformation Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 864,026

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest over 2 years, with 12.5% vesting each quarter during year 1 and 50% vesting in year 2. Each RSU represents a contingent right to receive one share of common stock, $0.01 par value per share (the "Common Stock") upon settlement.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0002149159-26-000004 · wk-form4_1786372640.xml · nonDerivative · entry 1

Woods Todd Charles · CIK 0002149159 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 220,506

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest over 2 years, with 12.5% vesting each quarter during year 1 and 50% vesting in year 2. Each RSU represents a contingent right to receive one share of common stock, $0.01 par value per share (the "Common Stock") upon settlement.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001822516-26-000004 · wk-form4_1786732335.xml · nonDerivative · entry 1

Wegner Alpana · CIK 0001822516 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 162,112

F1 · shares: Reflects a grant of restricted stock units ("RSUs") awarded on July 24, 2026. Subject to the reporting person's continued service through the applicable vesting date, 6.25% of the RSUs vest quarterly during the first 12 months following the grant date, and 25% of the RSUs vest on each July 22 thereafter through July 22, 2030. Each RSU represents a contingent right to receive one share of common stock, par value $0.01 per share ("Common Stock"), upon settlement.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001998256-26-000007 · wk-form4_1784323257.xml · derivative · entry 6

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,398,337

Underlying: Common Stock · 36,901 shares

Expires 2027-11-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: These options are currently vested.

SEC source: 0001998256-26-000007 · wk-form4_1784323257.xml · nonDerivative · entry 4

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 926,816

F4 · price: 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 $23.00 to $23.27, 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.

F1 · balance_after: Includes unvested RSUs.

F2 · balance_after: These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on March 13, 2026 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

SEC source: 0001998256-26-000007 · wk-form4_1784323257.xml · nonDerivative · entry 3

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 963,717

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes unvested RSUs.

F2 · balance_after: These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on March 13, 2026 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

SEC source: 0001998256-26-000007 · wk-form4_1784323257.xml · derivative · entry 5

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,435,238

Underlying: Common Stock · 33,099 shares

Expires 2027-11-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: These options are currently vested.

SEC source: 0001998256-26-000007 · wk-form4_1784323257.xml · nonDerivative · entry 2

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 926,816

F3 · price: 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 $23.00 to $23.08, 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.

F1 · balance_after: Includes unvested RSUs.

F2 · balance_after: These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on March 13, 2026 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

SEC source: 0001998256-26-000007 · wk-form4_1784323257.xml · nonDerivative · entry 1

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 959,915

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes unvested RSUs.

F2 · balance_after: These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on March 13, 2026 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

SEC source: 0002020858-26-000004 · wk-form4_1781038791.xml · nonDerivative · entry 1

Wittman Kimberly S. · CIK 0002020858 · Chief People Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 270,233

F1 · balance_after: The transaction represents shares of common stock withheld to pay taxes upon vesting of Non-Qualified Stock Options granted to the Reporting Person on June 6, 2024. 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.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001998332-26-000004 · wk-form4_1781038786.xml · nonDerivative · entry 1

Bridge T. Craig · CIK 0001998332 · Chief Transformation Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 658,556

F1 · balance_after: The transaction represents shares of common stock withheld to pay taxes upon vesting of Non-Qualified Stock Options granted to the Reporting Person on June 6, 2024. 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.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001998256-26-000004 · wk-form4_1781038796.xml · nonDerivative · entry 1

Hawkins Matthew J. · CIK 0001998256 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 926,816

F1 · balance_after: The transaction represents shares of common stock withheld to pay taxes upon vesting of Non-Qualified Stock Options granted to the Reporting Person on June 6, 2024. 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.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001368470-26-000004 · wk-form4_1781038780.xml · nonDerivative · entry 1

Oreskovich Steven M · CIK 0001368470 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 424,200

F1 · balance_after: The transaction represents shares of common stock withheld to pay taxes upon vesting of Non-Qualified Stock Options granted to the Reporting Person on June 6, 2024. 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.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001998333-26-000004 · wk-form4_1781038770.xml · nonDerivative · entry 1

Schremser Christopher L. · CIK 0001998333 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 495,033

F1 · balance_after: The transaction represents shares of common stock withheld to pay taxes upon vesting of Non-Qualified Stock Options granted to the Reporting Person on June 6, 2024. 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.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001998251-26-000004 · wk-form4_1781038775.xml · nonDerivative · entry 1

Miller Melissa F. (Missy) · CIK 0001998251 · Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 252,077

F1 · balance_after: The transaction represents shares of common stock withheld to pay taxes upon vesting of Non-Qualified Stock Options granted to the Reporting Person on June 6, 2024. 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.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001257287-26-000005 · wk-form4a_1790354439.xml · nonDerivative · entry 1

DRISCOLL JOHN PATRICK · CIK 0001257287 · Director · Chairperson

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 101,203

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement. This amended Form 4 is being filed solely to correct the number of RSUs granted from 9,303 to 10,446.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001946262-26-000004 · wk-form4a_1790354273.xml · nonDerivative · entry 1

Gupta Aashima · CIK 0001946262 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,580

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement. This amended Form 4 is being filed solely to correct the number of RSUs granted from 9,303 to 10,446.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001843139-26-000005 · wk-form4a_1790354262.xml · nonDerivative · entry 1

Riefberg Vivian E. · CIK 0001843139 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,275

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement. This amended Form 4 is being filed solely to correct the number of RSUs granted from 9,303 to 10,446.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001928634-26-000004 · wk-form4a_1790354268.xml · nonDerivative · entry 1

DeMichiei Robert · CIK 0001928634 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,342

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement. This amended Form 4 is being filed solely to correct the number of RSUs granted from 9,303 to 10,446.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001577544-26-000012 · wk-form4a_1790354253.xml · nonDerivative · entry 1

Roman Michael F · CIK 0001577544 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,580

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement. This amended Form 4 is being filed solely to correct the number of RSUs granted from 9,303 to 10,446.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001557593-26-000010 · wk-form4a_1790354248.xml · nonDerivative · entry 1

Hung Priscilla · CIK 0001557593 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,275

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement. This amended Form 4 is being filed solely to correct the number of RSUs granted from 9,303 to 10,446.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001199930-26-000007 · wk-form4a_1790354258.xml · nonDerivative · entry 1

MILLER HEIDI · CIK 0001199930 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,060

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement. This amended Form 4 is being filed solely to correct the number of RSUs granted from 9,303 to 10,446.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001928634-26-000002 · wk-form4_1780525461.xml · nonDerivative · entry 1

DeMichiei Robert · CIK 0001928634 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,199

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001946262-26-000002 · wk-form4_1780525455.xml · nonDerivative · entry 1

Gupta Aashima · CIK 0001946262 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,437

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001577544-26-000008 · wk-form4_1780525449.xml · nonDerivative · entry 1

Roman Michael F · CIK 0001577544 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,437

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001843139-26-000003 · wk-form4_1780525443.xml · nonDerivative · entry 1

Riefberg Vivian E. · CIK 0001843139 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,132

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001557593-26-000005 · wk-form4_1780525432.xml · nonDerivative · entry 1

Hung Priscilla · CIK 0001557593 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,132

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001199930-26-000005 · wk-form4_1780525438.xml · nonDerivative · entry 1

MILLER HEIDI · CIK 0001199930 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,917

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001257287-26-000003 · wk-form4_1780525155.xml · nonDerivative · entry 1

DRISCOLL JOHN PATRICK · CIK 0001257287 · Director · Chairperson

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,060

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vest on the earlier of (i) June 1, 2027 and (ii) the first regularly scheduled annual meeting of the stockholders following the grant date. Each RSU represents a contingent right to receive one share of Common Stock upon settlement.

F2 · balance_after: Includes unvested RSUs.

SEC source: 0001735839-26-000004 · wk-form4_1785786264.xml · nonDerivative · entry 1

PACKER GREGORY R · CIK 0001735839 · Chief Legal officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 192,948

F1 · balance_after: Includes unvested RSUs.

F2 · balance_after: The transaction represents shares of common stock withheld to pay taxes upon vesting of restricted stock units granted to the Reporting Person on April 1, 2025. The number of shares withheld was determined based on the actual sale price of shares sold on April 7, 2026 pursuant to a sell-to-cover transaction.

SEC source: 0002091511-26-000002 · wk-form4_1773268873.xml · nonDerivative · entry 1

Chan William · CIK 0002091511 · Chief Product & AI Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,580,812

F1 · shares: Reflects a grant of restricted stock units ("RSUs") which vests in four equal annual installments from the initial grant date through March 1, 2030. Each RSU represents a contingent right to receive one share of common stock, $0.01 par value per share (the "Common Stock") upon settlement.

F2 · balance_after: Reflects restricted stock units ("RSUs") that were issued to the reporting person on October 2, 2025 in connection with the acquisition of Iodine Software Holdings, Inc. by Waystar Holding Corp. These shares are subject to a lock-up agreement that restricts transfer for a period of six months following the closing of the acquisition.

F3 · balance_after: Includes unvested RSUs.