| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Panacea Innovation Ltd | 10%+ Owner | C/O MAPLES CORPORATE SERVICES LIMITED,, UGLAND HOUSE, GRAND CAYMAN, CAYMAN ISLANDS | Panacea Innovation Limited By: /s/ James Huang, Founding Managing Partner | 19 Aug 2025 | 0002010692 |
| Huang James | Director, 10%+ Owner | C/O MAPLES CORPORATE SERVICES LIMITED,, UGLAND HOUSE, GRAND CAYMAN, CAYMAN ISLANDS | /s/ James Huang | 19 Aug 2025 | 0001573160 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | ATRA | Common Stock | Purchase | $670,422 | +55,000 | +4.07% | $12.19 | 1,405,000 | 15 Aug 2025 | See Footnotes | F1, F2, F3 |
| Id | Content |
|---|---|
| F1 | The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $11.83 to $12.44, inclusive. The Reporting Person undertake to provide to the Issuer, any securityholder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above. |
| F2 | Represents securities held by Panacea Venture Healthcare Fund II, L.P. |
| F3 | James Huang is the sole owner of Panacea Innovation Limited, which is the sole owner of Panacea Venture Healthcare Fund II GP Company, Ltd. ("Fund II GP") and Panacea Opportunity Fund I GP Company, Ltd. ("Opportunity Fund GP"), which are the general partners of Panacea Venture Healthcare Fund II, L.P. and Panacea Opportunity Fund I, L.P. As a result, each of the Reporting Persons may be deemed to share beneficial ownership of the securities held of record by Panacea Venture Healthcare Fund II, L.P. and Panacea Opportunity Fund I, L.P., but each disclaims such beneficial ownership. |