Summary
Updated Aug 31, 2026
Michael B. Gustafson is Director of PDF SOLUTIONS INC (PDFS). 3 SEC Form 4 filings on record going back to 2025, most recently on 2 July 2026. Most recent open-market trade: bought $146K of PDFS on 14 May 2025. Lifetime open-market purchases: $146K.
Recent Transactions
3Every recent SEC Form 4 transaction Michael B. Gustafson 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 Michael B. Gustafson 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.
- Shuo Zhang - $77K of PDFS 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 Michael B. Gustafson?
Michael B. Gustafson is a corporate insider, tracked as Director of PDF SOLUTIONS INC (PDFS). 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 Michael B. Gustafson submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Michael B. Gustafson been buying or selling stock?
Recorded transactions: 1 open-market purchase ($146K) and 0 open-market sales across all tracked filings.
Where can I see all of Michael B. Gustafson'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.
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