| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| HULL CHARLES W | EVP & Chief Technology Officer | 333 THREE D SYSTEMS CIRCLE, ROCK HILL | Andrew WB Wright, Attorney-in-Fact for Charles W. Hull | 17 Mar 2026 | 0001105964 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | DDD | Common Stock | Award | +32,500 | +27% | $0.000000* | 154,150 | 01 Apr 2025 | Direct | F1, F2 | |
| holding | DDD | Common Stock | 331,955 | 01 Apr 2025 | By Trust | F3 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | DDD | Performance Based Restricted Stock Units | Award | +32,500 | $0.000000* | 32,500 | 01 Apr 2025 | Common Stock | 32,500 | Direct | F4 |
| Id | Content |
|---|---|
| F1 | Inadvertently filed late due to administrative error. |
| F2 | The Reporting Person has been awarded 32,500 shares of restricted stock under the Issuer's 2015 Incentive Plan. One-third of the total shares awarded vest on April 1, 2026, an additional one-third of the total shares awarded vest on April 1, 2027, and the remaining shares awarded vest on April 1, 2028, subject to continued employment. |
| F3 | By the Charles William Hull and Charlene Antoinette Hull 1992 Revocable Living Trust for which the Reporting Person serves as trustee. |
| F4 | Each performance share unit represents a contingent right to receive one share of the Issuer's common stock. The performance share units vest upon the Issuer's common stock achieving a specified price per share. |