| 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 | 06 Jun 2025 | 0001244203 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| holding | STEM | Common Stock, Par Value $0.0001 Per Share | 119,789 | 04 Jun 2025 | Direct | F1 | |||||
| holding | STEM | Common Stock, Par Value $0.0001 Per Share | 641,209 | 04 Jun 2025 | By the David S. Buzby Revocable Trust |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | STEM | Restricted Stock Unit | Award | $0 | +149,723 | $0.000000 | 149,723 | 04 Jun 2025 | Common Stock, Par Value 0.0001 Per Share | 149,723 | Direct | F2, F3 |
| Id | Content |
|---|---|
| F1 | The Reporting Person's holdings in Column 5 reflect an adjustment to correct a previous filing made on June 2, 2025, which incorrectly reported a vesting of 110,236 RSUs. These RSUs were previously forfeited by the Reporting Person. |
| F2 | Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock. |
| F3 | On June 4, 2025, the Reporting Person was granted 149,723 RSUs vesting 100% on August 7, 2026. |