| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
Director
2 companies
Michael B Gustafson is Director at PDFS, with reported holdings spanning 2 companies. Michael B Gustafson's net worth is not public. Form 4 filings only show shares in the companies where this person is an insider; those holdings are worth an estimated $2.2M at current prices.
Our model assigns Michael B Gustafson a middling insider score of 65/100, based on 11 past trades. Over a 12-month horizon, 63.6% of those trades were profitable, with an average 12-month return of +15.7%.
Michael B Gustafson's largest disclosed position is in PDFS as Director, worth about $1.7M. The PDFS filings lean toward selling, a net 19,166 shares.
Michael B Gustafson has 25 Form 4 filings on record from March 2017 to July 2026, across 2 companies: Director at PDF Solutions (PDFS), 2018–2026; Director at Everspin Technologies (MRAM), 2017–2022.
The 37 reported transactions were 16 open-market sales, 13 stock awards, 3 open-market purchases and 3 option or other derivative awards, plus smaller numbers of other types.
Counted by filing, the open-market trades come to 3 purchases worth about $338K and 8 sales worth about $1.4M.
The largest open-market purchase was 7,500 shares of PDFS at an average $19.45 on May 13, 2025, about $146K. Twelve months later PDFS was up 166%.
The largest open-market sale was 13,316 shares of PDFS at an average $37.26 on February 28, 2023, about $496K. Twelve months later PDFS was down 13%.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| May 13, 2025 | PDFS Pdf Solutions Inc | Director | Buy | 7,500 | $19.45 | $145,875.00 | +33.2% | -2.3% | +165.7% | |
| Feb 24, 2025 | PDFS Pdf Solutions Inc | Director | Buy | 4,000 | $23.06 | $92,240.00 | +21.5% | -16.0% | +47.6% | |
| Dec 13, 2023 | PDFS Pdf Solutions Inc | Director | Sell | 5,750 | $30.92 | $177,817.81 | -28.8% | +12.3% | -2.1% | |
| Feb 28, 2023 | PDFS Pdf Solutions Inc | Director | Sell | 13,316 | $37.26 | $496,154.16 | -44.5% | +12.7% | -12.6% | |
| Nov 16, 2022 | PDFS Pdf Solutions Inc | Director | Sell | 5,000 | $29.92 | $149,600.00 | -14.3% | +10.3% | +1.2% | |
| Aug 18, 2022 | MRAM Everspin Technologies Inc. | Director | Sale+OE | 33,603 | $7.55 | $253,761.06 | -47.8% | -22.8% | +23.0% | |
| Nov 17, 2021 | MRAM Everspin Technologies Inc. | Director | Sell | 14,286 | $12.70 | $181,432.20 | -19.7% | -15.9% | -54.6% | |
| Nov 12, 2021 | PDFS Pdf Solutions Inc | Director | Sell | 3,000 | $33.00 | $98,991.90 | -9.8% | -10.6% | -9.9% | |
| Nov 6, 2019 | PDFS Pdf Solutions Inc | Director | Sell | 2,600 | $15.78 | $41,034.92 | -10.9% | - | - | |
| Jun 13, 2019 | PDFS Pdf Solutions Inc | Director | Sell | 1,000 | $12.95 | $12,949.30 | -4.9% | - | - |