NPK International Inc.
Ownership
Ownership Structure
Who owns NPK International Inc. (NPKI)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 95.0% of the shares are freely tradable; institutional investors hold 92.9%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 9.46 | 7,940,503 | +10.2 | 06/30/2026 |
| Ameriprise Financial Inc | 5.35 | 4,486,433 | -20.2 | 06/30/2026 |
| Dimensional Fund Advisors, Inc. | 4.34 | 3,641,547 | -8.6 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.30 | 3,604,823 | +5.3 | 06/30/2026 |
| American Century Companies Inc | 3.73 | 3,128,652 | +2.8 | 06/30/2026 |
| Wasatch Advisors LP | 3.35 | 2,811,593 | -3.0 | 06/30/2026 |
| Geode Capital Management, LLC | 2.82 | 2,369,714 | +5.6 | 06/30/2026 |
| Royce & Associates, LP | 2.56 | 2,149,100 | +3.8 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.04 | 2,552,545 | +0.0 | 09/30/2026 |
| CT (Lux) American Smaller Com 9U USD | 2.83 | 2,378,843 | -2.8 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Robeson Rose M | Director | 215,147 | 2,022,382 $ | Aug 27, 2026 | direct |
| Lewis Michael A | Director | 135,865 | 1,277,131 $ | Aug 17, 2026 | direct |
| Warren Matthew James | Chief Accounting Officer | 51,439 | 483,527 $ | Sep 9, 2026 | direct |
| Barton III Alvin James | EVP Commercial Growth & Ops. | 12,850 | 120,790 $ | Sep 22, 2026 | direct |
| Pederson Kristen J. | Director | 6,614 | 62,172 $ | Jul 28, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 22, 2026 | Barton III Alvin James | EVP Commercial Growth & Ops. | Other | 12,850 | 0.00 | – |
| Sep 9, 2026 | Warren Matthew James | Chief Accounting Officer | Sell | 2,991 | 13.41 | 40,113 |
| Aug 27, 2026 | Robeson Rose M | Director | Sell | 10,000 | 13.49 | 134,917 |
| Aug 17, 2026 | Lewis Michael A | Director | Sell | 2,013 | 14.26 | 28,705 |
| Jul 28, 2026 | Pederson Kristen J. | Director | Other | 6,614 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: October 30, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.