| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| ANDERSON ERIK J | Director | C/O SOLID POWER, INC., 486 S. PIERCE AVE., SUITE E, LOUISVILLE | /s/ Erik J. Anderson | 08 Dec 2025 | 0001174968 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | SLDP | Common Stock | Sale | $156,072 | -30,000 | -16% | $5.20 | 157,617 | 04 Dec 2025 | By WestRiver Management, LLC | F1 |
| holding | SLDP | Common Stock | 260,370 | 04 Dec 2025 | Direct |
| Id | Content |
|---|---|
| F1 | The reporting person is the sole member and sole manager of WestRiver Management, LLC. |