| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Schremser Christopher L. | Chief Technology Officer | 1550 DIGITAL DRIVE, #300, LEHI | /s/ Gregory R. Packer, as Attorney-in-Fact | 14 Oct 2025 | 0001998333 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | WAY | Common Stock | Options Exercise | $35,699 | +8,623 | +2% | $4.14 | 430,994 | 10 Oct 2025 | Direct | F1, F2 |
| transaction | WAY | Common Stock | Sale | $312,215 | -8,623 | -2% | $36.21 | 422,371 | 10 Oct 2025 | Direct | F1, F2, F3 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | WAY | Stock Options (right to buy) | Options Exercise | $0 | -8,623 | -9.1% | $0.000000 | 86,240 | 10 Oct 2025 | Common Stock | 8,623 | $4.14 | Direct | F4 |
| Id | Content |
|---|---|
| F1 | These transactions occurred automatically pursuant to a plan adopted by the Reporting Person on December 6, 2024 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). |
| F2 | Includes unvested RSUs. |
| F3 | 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 $35.66 to $37.22, 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. |
| F4 | These options are currently vested. |