Matthew James Warren
Chief Accounting Officer · NPK International Inc.
- 2026
- Sep 10, 2026
- 1
Other insiders active in the same stocks
Insiders who reported open-market trades in the last 12 months at the companies Matthew James Warren files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Gregg Piontek - $2.49M in NPKI purchases and sales in the last 12 months
- Matthew Lanigan - $2.42M in NPKI purchases and sales in the last 12 months
- Lori Briggs - $275K in NPKI purchases and sales in the last 12 months
- Mary Celeste Fruge - $163K in NPKI purchases and sales in the last 12 months
- Rose M. Robeson - $135K in NPKI purchases and sales in the last 12 months
- Michael A. Lewis - $112K in NPKI purchases and sales in the last 12 months
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Frequently asked questions
Who is Matthew James Warren?
Matthew James Warren is a corporate insider, tracked as Chief Accounting Officer of NPK International Inc. (NPKI). InsiderAlpha holds 1 primary Form 4 filing for them, the earliest from 2026, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Matthew James Warren submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Matthew James Warren been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($40K) across all tracked filings.
