| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| ZUIKER JOSEPH R. | EVP, Engineering & Operations | 333 THREE D SYSTEMS CIRCLE, ROCK HILL | Rebecca McClaflin, Attorney-in-Fact for Joseph R. Zuiker | 16 Dec 2025 | 0001957687 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | DDD | Common Stock | Tax liability | -$9.9K | -5.21K | -2.55% | $1.90 | 199K | 12 Dec 2025 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | Shares reported were withheld to satisfy tax withholding obligations with respect to the vesting of a grant of restricted stock originally made on December 12, 2022. |