| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| BUZBY DAVID S | Director | 1400 POST OAK BOULEVARD, SUITE 560, HOUSTON | /s/ Saul R. Laureles, Attorney-in-Fact | 2025-07-08 | 0001244203 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | STEM | Common Stock, Par Value $0.0001 Per Share | Gift | $0 | -5.51K | -92.02% | $0.00 | 478 | Jul 3, 2025 | Direct | F1 |
| transaction | STEM | Common Stock, Par Value $0.0001 Per Share | Gift | $0 | +5.51K | +17.19% | $0.00 | 37.6K | Jul 3, 2025 | By the David S. Buzby Revocable Trust | F1, F2 |
| Id | Content |
|---|---|
| F1 | On July 3, 2025, the reporting person transferred 5,511 shares of common stock to the 2016 David S. Buzby Revocable Trust (of which the reporting person is sole trustee) for no consideration. |
| F2 | Held by the 2016 David S. Buzby Revocable Trust, of which the reporting person is sole trustee. |