| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Frederick Douglas J | COO, VP, SECRETARY, Director | 3925 N HASTINGS WAY, EAU CLAIRE | /s/ Ann Werner by Power of Attorney | 16 Mar 2026 | 0001477240 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | NPK | Common stock $1.00 par value | Tax liability | -36 | -0.39% | $131.58* | 9,106 | 16 Mar 2026 | Direct | ||
| holding | NPK | Common stock $1.00 par value | 1,681 | 16 Mar 2026 | 401(k) plan |