Updated Jul 16, 2026 · Last SEC filing 2026-06-09
NPK International Inc. (NPKI) has filed 17 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-09. 3 Form 8-K material event filings were reported by NPKI in the last 90 days. 4 Form 144 notices of proposed sale were filed for NPKI stock. InsiderAlpha tracks every NPKI SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SIC classification | Services-Miscellaneous Equipment Rental & Leasing (SIC 7350) |
|---|---|
| SEC CIK | 0000071829 |
| Form 4 filings (90d) | 17 |
|---|---|
| Form 8-K filings (90d) | 3 |
| Form 144 notices (90d) | 4 |
| Latest Form 4 filing | 2026-06-09 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Briggs Lori | VP & President, Ind. Solutions | S — Open-market sale | 8.3K | $14.75 | $123K | SEC | |
| LANIGAN MATTHEW | President & CEO | S — Open-market sale | 167.4K | $14.43 | $2.42M | SEC | |
| Briggs Lori | VP & President, Ind. Solutions | S — Open-market sale | 10.4K | $14.58 | $152K | SEC | |
| Fruge Mary Celeste | VP, General Counsel | F — Tax withholding / forfeiture | 3.8K | $14.31 | $55K | SEC | |
| LANIGAN MATTHEW | President & CEO | F — Tax withholding / forfeiture | 39.4K | $14.31 | $564K | SEC | |
| Piontek Gregg | Senior Vice President and CFO | M — Option exercise | 40.4K | $0.00 | — | SEC | |
| Piontek Gregg | Senior Vice President and CFO | F — Tax withholding / forfeiture | 9.0K | $14.31 | $128K | SEC | |
| Briggs Lori | VP & President, Ind. Solutions | F — Tax withholding / forfeiture | 6.8K | $14.31 | $97K | SEC | |
| Briggs Lori | VP & President, Ind. Solutions | M — Option exercise | 24.3K | $0.00 | — | SEC | |
| LANIGAN MATTHEW | President & CEO | M — Option exercise | 100.2K | $0.00 | — | SEC | |
| Briggs Lori | VP & President, Ind. Solutions | F — Tax withholding / forfeiture | 5.4K | $14.31 | $77K | SEC | |
| Briggs Lori | VP & President, Ind. Solutions | F — Tax withholding / forfeiture | 9.6K | $14.31 | $137K | SEC | |
| LANIGAN MATTHEW | President & CEO | F — Tax withholding / forfeiture | 27.9K | $14.31 | $399K | SEC | |
| Piontek Gregg | Senior Vice President and CFO | F — Tax withholding / forfeiture | 11.2K | $14.31 | $161K | SEC | |
| LANIGAN MATTHEW | President & CEO | F — Tax withholding / forfeiture | 22.2K | $14.31 | $318K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for NPK International Inc. (NPKI). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Briggs Lori | 8 | $586K |
| LANIGAN MATTHEW | 7 | $3.70M |
| Piontek Gregg | 6 | $516K |
| Fruge Mary Celeste | 6 | $227K |
| Lewis Michael A | 2 | $31K |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in NPKI insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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