| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Peuse David J | CFO & TREASURER | 3925 N HASTINGS WAY, EAU CLAIRE | /s/ Ann Werner by Power of Attorney | 18 Mar 2026 | 0001778495 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | NPK | Common stock $1.00 par value | Sale | $70,078 | -500 | -62% | $140.16 | 308 | 17 Mar 2026 | 401(k) plan | F1 |
| holding | NPK | Common stock $1.00 par value | 1,669 | 17 Mar 2026 | Direct |
| Id | Content |
|---|---|
| F1 | The stock being sold was acquired on various dates during the period 7/31/2000 through 3/31/2020 pursuant to the company match feature of the issuer's 401K and related dividends. |