Frederick Douglas J (CIK 1477240) reported 2 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-03-16). Recent activity: Sell NPK (36 shares), Buy NPK (386 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-16 | NATIONAL PRESTO INDUSTRIES INC (NPK) | COO, VP, SECRETARY | Sell | 36 | $4,737 |
| 2026-01-05 | NATIONAL PRESTO INDUSTRIES INC (NPK) | COO, VP, SECRETARY | Buy | 386 | $0 |
来源：SEC Form 4 申报文件 · 截至 2026-03-16