As of November 6, 2026, NPK International Inc. is a publicly traded company (NYSE: NPKI); its largest reported holder is BlackRock, with 8.4% on Schedule 13G/A of July 29, 2026, then Ameriprise (6.2%). The largest insider holding is Matthew Lanigan, the chief executive and president, with 1,024,948 shares (1.2% of shares outstanding), per Form 4 of June 5, 2026 (Schedule 13G/A, July 29, 2026).
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Is NPK International Inc. a real, registered company?
- NPK International Inc files with the SEC under CIK 71829 (its SEC filings).
- Its shares are listed under the ticker NPKI on NYSE (SEC company record).
- Incorporated in Delaware; business address in The Woodlands, Texas, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under NPK International Inc in our court records and SEC 8-K records (as of 2026-11-06).
- Leadership changes: the latest reported is James Barton, Executive Vice President, Commercial Growth (Form 8-K filed 2026-09-14). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Vanguard (filed 2026-07-31).
Who are NPK International Inc.'s owners and officers?
NPK International Inc.: incorporated in Delaware; business address in The Woodlands, Texas; industry Services-Miscellaneous Equipment Rental & Leasing (Schedule 13G/A, 2026-10-30).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-10-30 | Vanguard Capital Management | 4.97% |
| Schedule 13G, 2026-07-31 | Vanguard Capital Management | 5.01% |
| Schedule 13G/A, 2026-07-29 | Blackrock, Inc. | 8.4% |
| Schedule 13G/A, 2026-04-09 | Dimensional Fund Advisors LP | 4.7% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
| Schedule 13G/A, 2025-11-14 | Ameriprise Financial, Inc. | 6.2% |
| Schedule 13G/A, 2025-10-09 | Dimensional Fund Advisors LP | 5.7% |
Questions about who owns NPK International Inc.
Who owns NPK International Inc.?
On this page, 2 holders' latest ownership filings report 5% or more of NPK International Inc.: Blackrock, Inc. (8.4%, Schedule 13G/A, filed 2026-07-29) and Ameriprise Financial, Inc. (6.2%, Schedule 13G/A, filed 2025-11-14).
Who are the largest shareholders of NPK International Inc.?
By the share each holder's latest filing reports, the largest holders of NPK International Inc. on this page are Blackrock, Inc. (8.4%) and Ameriprise Financial, Inc. (6.2%).
When did Blackrock, Inc. buy into NPK International Inc.?
The filings give report dates, not purchase dates. The earliest filing from Blackrock, Inc. on this page is the Schedule 13G/A, filed 2026-07-29, reporting 8.4%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 7 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-09-14 | James Barton | Executive Vice President, Commercial Growth | appointed | 2026-09-22 |
| Form 8-K, 2026-09-02 | Gregg Piontek | Chief Financial Officer | departed | |
| Form 8-K, 2026-09-02 | Matthew Warren | Chief Accounting Officer | appointed | 2026-08-31 |
| Form 8-K, 2026-07-28 | Kristen J. Pederson | Director | appointed | 2026-07-28 |
Which insiders own NPK International Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chief executive and president: 1,024,948 shares (1.2% of shares outstanding), 254,699 held directly and 770,249 indirectly (Form 4, 2026-06-05).
- , the president and chief financial officer: 923,182 shares (1.1% of shares outstanding), 858,182 held directly and 65,000 indirectly (Form 4, 2026-06-03).
- , a director: 310,940 shares (0.37% of shares outstanding) (Form 4, 2025-05-19).
- , the vice president and chief accounting officer: 305,245 shares (0.36% of shares outstanding) (Form 4, 2025-06-17).
- , the general counsel and vice president: 284,641 shares (0.34% of shares outstanding) (Form 4, 2026-06-03).
Shares outstanding: 83,923,121 as of 2026-10-28, from the company's latest SEC cover page.
How much has NPK International Inc. raised?
Acquisitions reported on Form 8-K, Item 2.01: completed an acquisition (2025-11-24).
Keep reading
More on NPK International Inc. and the records around it.
NPK International Inc. elsewhere on the record
- Leadership changes Sep 2026
Companies that share a holder
- Ameriprise Financial, Inc. also filed stake reports on 65 other companies: Universal Electronics Inc. (Sep 2026), America's Car-Mart, Inc. (Aug 2026), Ampco-Pittsburgh Corporation (Aug 2026)
- Dimensional Fund Advisors LP also filed stake reports on 366 other companies: Acadia Healthcare Co Inc (Oct 2026), ADT Inc (Oct 2026), AGCO Corp (Oct 2026)
- Vanguard Capital Management also filed stake reports on 1495 other companies: A10 Networks Inc (Oct 2026), Altisource Portfolio Solutions SA (Oct 2026), Alto Neuroscience Inc (Oct 2026)
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