Summary
Updated Aug 30, 2026
Matthew K. Diamond is Chief Accounting Officer of Star Equity Holdings, Inc. (STRR). 3 SEC Form 4 filings on record going back to 2025, most recently on 1 June 2026.
Recent Transactions
4Every recent SEC Form 4 transaction Matthew K. Diamond has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Matthew K. Diamond 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.
- Jeffrey E. Eberwein - $2.39M of STRR open-market activity in the last 12 months
- Todd Michael Fruhbeis - $65K of STRR open-market activity in the last 12 months
- Louis A. Parks - $39K of STRR open-market activity in the last 12 months
- Richard Kenneth Coleman Jr. - $19K of STRR open-market activity in the last 12 months
- Mimi K. Drake - $12K of STRR open-market activity in the last 12 months
- Jennifer Palmer - $8K of STRR open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Matthew K. Diamond?
Matthew K. Diamond is a corporate insider, tracked as Chief Accounting Officer of Star Equity Holdings, Inc. (STRR). InsiderAlpha holds 3 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Matthew K. Diamond submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Where can I see all of Matthew K. Diamond's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Follow Matthew K. Diamond and every insider like them
A free account opens the full scored daily plan and every past day, a watchlist for any ticker, and 3 months of price history on every company page. No card.
Free plan available · Paid plans start with a 7-day free trial
