Gregg Piontek, Senior Vice President and CFO of NPK International Inc. ($NPKI), sold shares on the open market twice in the last 365 days for a total of $1.53 million. His most recent sale occurred on March 4, 2026. These sales rank 4,026th among 11,678 individual insiders, below the average sale amount of $8.6 million across about 6 transactions per insider. Piontek made no open market purchases during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| April 1, 2026 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | S | Common Stock | 35000 | $14.51 | 899,326.0000 | 111,669,000 | 3.75% | 0.03% |
| March 25, 2026 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | S | Common Stock | 15000 | $15.03 | 934,326.0000 | 111,669,000 | 1.58% | 0.01% |
| March 4, 2026 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | M | Non-Qualified Stock Option (right to buy) | 73590 | $0.00 | 0.0000 | 111,669,000 | 100.00% | 0.07% |
| March 4, 2026 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | S | Common Stock | 35000 | $14.02 | 949,326.0000 | 111,669,000 | 3.56% | 0.03% |
| March 4, 2026 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | S | Common Stock | 73590 | $14.10 | 984,326.0000 | 111,669,000 | 6.96% | 0.07% |
| March 4, 2026 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | M | Common Stock | 73590 | $4.32 | 1,057,916.0000 | 111,669,000 | 7.48% | 0.07% |
| June 1, 2025 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | M | Restricted Stock Units | 40379 | $0.00 | 40,379.0000 | 111,669,000 | 50.00% | 0.04% |
| June 1, 2025 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | M | Common Stock | 43790 | $0.00 | 986,026.0000 | 111,669,000 | 4.65% | 0.04% |
| June 1, 2025 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | F | Common Stock | 17231 | $8.09 | 968,795.0000 | 111,669,000 | 1.75% | 0.02% |
| June 1, 2025 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | F | Common Stock | 15889 | $8.09 | 952,906.0000 | 111,669,000 | 1.64% | 0.01% |
| June 1, 2025 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | F | Common Stock | 8959 | $8.09 | 943,947.0000 | 111,669,000 | 0.94% | 0.01% |
| June 1, 2025 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | M | Common Stock | 40379 | $0.00 | 984,326.0000 | 111,669,000 | 4.28% | 0.04% |
| June 1, 2025 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | M | Restricted Stock Units | 43790 | $0.00 | 80,758.0000 | 111,669,000 | 35.16% | 0.04% |
| May 14, 2025 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | A | Common Stock | 85706 | $0.00 | 942,236.0000 | 111,669,000 | 10.01% | 0.08% |
| June 1, 2024 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | M | Restricted Stock Units | 51181 | $0.00 | 208,718.0000 | 111,669,000 | 19.69% | 0.05% |
| June 1, 2024 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | M | Restricted Stock Units | 43790 | $0.00 | 164,928.0000 | 111,669,000 | 20.98% | 0.04% |
| June 1, 2024 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | M | Restricted Stock Units | 40380 | $0.00 | 124,548.0000 | 111,669,000 | 24.48% | 0.04% |
| June 1, 2024 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | F | Common Stock | 20139 | $8.48 | 856,530.0000 | 111,669,000 | 2.30% | 0.02% |
| June 1, 2024 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | F | Common Stock | 15889 | $8.48 | 893,900.0000 | 111,669,000 | 1.75% | 0.01% |
| June 1, 2024 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | M | Common Stock | 40380 | $0.00 | 909,789.0000 | 111,669,000 | 4.64% | 0.04% |
| June 1, 2024 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | M | Common Stock | 43790 | $0.00 | 869,409.0000 | 111,669,000 | 5.30% | 0.04% |
| June 1, 2024 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | M | Common Stock | 51181 | $0.00 | 825,619.0000 | 111,669,000 | 6.61% | 0.05% |
| June 1, 2024 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | F | Common Stock | 17231 | $8.48 | 876,669.0000 | 111,669,000 | 1.93% | 0.02% |
| May 15, 2024 | NPK International Inc. | $NPKI | Piontek Gregg | Senior Vice President and CFO | A | Common Stock | 68308 | $0.00 | 774,438.0000 | 111,669,000 | 9.67% | 0.06% |