X0609 4 2026-06-09 0 0001990354 Waystar Holding Corp. WAY 0001368470 Oreskovich Steven M false 1550 DIGITAL DRIVE, #300 LEHI UT 84043 0 1 0 0 Chief Financial Officer 0 Common Stock 2026-06-09 4 F 0 12583 19.23 D 424200 D 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. Includes unvested RSUs. /s/ Gregory R. Packer, as Attorney-in-Fact 2026-06-09