MINGE JOHN C (CIK 1724571) reported 3 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-05-21). Recent activity: Buy NPKI (8,558 shares), Buy NPKI (15,097 shares), Buy NPKI (10,000 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-21 | NPK International Inc. (NPKI) | Director | Buy | 8,558 | $0 |
| 2025-05-19 | NPK International Inc. (NPKI) | Director | Buy | 15,097 | $0 |
| 2025-03-06 | NPK International Inc. (NPKI) | Director | Buy | 10,000 | $53,800 |
Source: SEC Form 4 filings · as of 2026-05-21