| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Bello Akintunde Olatokumbo | Director | 828 WINTER STREET, SUITE 300, WALTHAM | /s/ Elana Brockmann, Attorney-in-Fact | 12 Jun 2025 | 0002070709 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | XLO | Stock Option (right to buy) | Award | $0 | +62,000 | $0.000000 | 62,000 | 10 Jun 2025 | Common Stock | 62,000 | $0.7000 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | The option was granted on June 10, 2025 and will vest in three equal installments on June 10, 2026, June 10, 2027 and June 10, 2028, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date. |