144 0001998333 XXXXXXXX LIVE 0001990354 WAYSTAR HOLDING CORP 001-42125 1550 Digital Drive, #300 Lehi UT 84043 8444929782 CHRISTOPHER SCHREMSER Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

25869 1053385.68 173018999 06/10/2025 NASDAQ Common 06/10/2025 Exercise of Stock Options Issuer N 25869 06/10/2025 Cash N 10b5-1 Sales for CHRISTOPHER SCHREMSER

1550 Digital Drive, #300 Lehi UT 84043

Common 05/09/2025 8623 346352.28 10b5-1 Sales for CHRISTOPHER SCHREMSER

1550 Digital Drive, #300 Lehi UT 84043

Common 04/10/2025 8623 313546.08 The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale. 06/10/2025 12/06/2024 /s/ Christopher Schremser