| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| MacKenzie John Roderick JR | VP-SALES | 3925 N HASTINGS WAY, EAU CLAIRE | /s/ Ann Werner by Power of Attorney | 16 Mar 2026 | 0001966688 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | NPK | Common stock $1.00 par value | Tax liability | -62 | -3.3% | $131.58* | 1,813 | 16 Mar 2026 | Direct | ||
| holding | NPK | Common stock $1.00 par value | 535 | 16 Mar 2026 | 401(k) plan |