NPK International Inc. (NPKI) has 12 known insider and institutional holders on record. The largest holder is Piontek Gregg with 834,326 shares. Other notable holders include LANIGAN MATTHEW and Young Donald Win.
Over the last 12 months, insiders have made 37 transactions in NPKI stock — 15 buys (valued at $136.43K) and 10 sells (valued at $1.17M). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
NPKI Insider Ownership
Top Holder
Piontek Gregg
834,326 shares
Buys (12 mo)
15
$136.43K value
Sells (12 mo)
10
$1.17M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Piontek Gregg |
Senior Vice President and CFO |
834,326 |
2026-04-03 |
|
| 2 |
Lanigan Matthew |
President & CEO |
325,664 |
2025-10-06 |
|
| 3 |
Young Donald Win |
Director |
310,940 |
2025-05-19 |
|
| 4 |
White Douglas L |
VP, CAO & Treasurer |
305,245 |
2025-06-17 |
|
| 5 |
Minge John C |
Director |
245,384 |
2025-05-19 |
|
| 6 |
Briggs Lori |
VP & President, Ind. Solutions |
242,513 |
2025-10-03 |
|
| 7 |
Robeson Rose M |
Director |
214,285 |
2025-05-19 |
|
| 8 |
Lewis Michael A |
Director |
131,333 |
2026-02-25 |
|
| 9 |
Meer Claudia Michel |
Director |
118,135 |
2025-05-20 |
|
| 10 |
Cutillo Joseph A |
Director |
27,597 |
2025-05-19 |
|
| 11 |
Larson Roderick A. |
Director |
15,097 |
2025-05-19 |
|
| 12 |
Fruge Mary Celeste |
VP, General Counsel |
1,000 |
2026-03-10 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-04-01 |
Piontek Gregg |
Senior Vice President and CFO |
Informative Sell |
35,000 |
$14.51 |
$507.86K |
| 2026-03-25 |
Piontek Gregg |
Senior Vice President and CFO |
Informative Sell |
15,000 |
$15.03 |
$225.38K |
| 2026-03-16 |
Fruge Mary Celeste |
VP, General Counsel |
Option Exercise (Sell) |
1,000 |
$4.32 |
$4.32K |
| 2026-03-06 |
Fruge Mary Celeste |
VP, General Counsel |
Option Exercise (Sell) |
11,193 |
$4.32 |
$48.35K |
| 2026-03-04 |
Piontek Gregg |
Senior Vice President and CFO |
Option Exercise (Sell) |
73,590 |
$4.32 |
$317.91K |
| 2026-02-23 |
Lewis Michael A |
Director |
Informative Sell |
2,013 |
$14.31 |
$28.8K |
| 2025-06-01 |
Fruge Mary Celeste |
VP, General Counsel |
Option Exercise (Sell) |
17,274 |
- |
- |
| 2025-11-24 |
Lewis Michael A |
Director |
Informative Sell |
2,013 |
$12.00 |
$24.16K |
| 2025-10-03 |
Lanigan Matthew |
President & CEO |
Gift (Given) |
770,249 |
- |
- |
| 2025-10-01 |
Briggs Lori |
VP & President, Ind. Solutions |
Informative Sell |
10,108 |
$11.51 |
$116.35K |
| 2025-09-03 |
Lanigan Matthew |
President & CEO |
Option Exercise (Sell) |
1,000 |
$4.32 |
$4.32K |
| 2025-08-22 |
Lanigan Matthew |
President & CEO |
Option Exercise (Sell) |
68,896 |
$4.32 |
$297.63K |
| 2025-08-25 |
Lewis Michael A |
Director |
Informative Sell |
2,013 |
$10.33 |
$20.8K |
| 2025-08-11 |
Briggs Lori |
VP & President, Ind. Solutions |
Informative Sell |
8,005 |
$9.51 |
$76.15K |
| 2025-07-09 |
Briggs Lori |
VP & President, Ind. Solutions |
Informative Sell |
8,005 |
$8.57 |
$68.58K |
| 2025-06-14 |
White Douglas L |
VP, CAO & Treasurer |
RSU Award |
730 |
$6.51 |
$4.75K |
| 2025-06-16 |
Lewis Michael A |
Director |
Informative Sell |
2,013 |
$8.60 |
$17.32K |
| 2025-06-06 |
Briggs Lori |
VP & President, Ind. Solutions |
Informative Sell |
9,704 |
$8.38 |
$81.32K |
| 2025-06-01 |
Fruge Mary Celeste |
VP, General Counsel |
Option Exercise (Sell) |
17,247 |
- |
- |
| 2025-06-01 |
Briggs Lori |
VP & President, Ind. Solutions |
Option Exercise (Sell) |
24,340 |
- |
- |
| 2025-06-01 |
Lanigan Matthew |
President & CEO |
Option Exercise (Sell) |
100,188 |
- |
- |
| 2025-06-01 |
White Douglas L |
VP, CAO & Treasurer |
Option Exercise (Sell) |
14,667 |
- |
- |
| 2025-06-01 |
Piontek Gregg |
Senior Vice President and CFO |
Option Exercise (Sell) |
40,379 |
- |
- |
| 2025-05-19 |
Meer Claudia Michel |
Director |
Informative Buy |
4,000 |
$7.92 |
$31.68K |
| 2025-05-15 |
Young Donald Win |
Director |
RSU Award |
15,097 |
- |
- |
