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.
Andrzej Strojwas - $151K in PDFS purchases and sales in the last 12 months
Shuo Zhang - $77K in PDFS purchases and sales in the last 12 months
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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.
When did Michael B. Gustafson last file a Form 4?
The most recent primary Form 4 on record is dated 2 July 2026, one of 3 filings going back to 2025.
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.
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
3
The latest 3 SEC Form 4 transactions reported by Michael B. Gustafson.
InsiderAlpha's records for Michael B. Gustafson go back to 2025: 3 primary Form 4 filings, an average of 1.5 per year. The typical open-market purchase is $146K (1 buy totaling $146K). The largest single buy on record is $146K of PDFS in 2025. No recorded transaction carries a Rule 10b5-1 plan flag. An absent flag does not establish whether a transaction was pre-arranged or discretionary.
