| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Russo Rene | PRESIDENT AND CEO, Director | 828 WINTER STREET, SUITE 300, WALTHAM | /s/ Kevin Brennan, Attorney-in-Fact | 18 Jun 2025 | 0001722066 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| holding | XLO | Common Stock | 244,883 | 01 Jan 2025 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | On January 3, 2025, the Reporting Person filed a Form 4 that inadvertently omitted a power of attorney. This amendment is being filed solely to add the power of attorney attached hereto as Exhibit 24.1. |