| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Boyce Sarah | Director | C/O ATRIUM THERAPEUTICS, INC., 10578 SCIENCE CENTER DRIVE, SUITE 125, SAN DIEGO | /s/ Adam Grajewski, Attorney-in-Fact | 26 Feb 2026 | 0001629383 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| holding | Common Stock | 265,086 | 26 Feb 2026 | Direct |
Exhibit List - Exhibit 24.1 Power of Attorney