Gustafson Michael B insider trades
Gustafson Michael B has filed 23 Form 4s with the SEC that we hold, for Pdf Solutions INC (PDFS) (Director), MTTR (Director) and Everspin Technologies INC. (MRAM) (Director). Across all of them we count 2 purchases worth $238.1K and 13 sales worth $1.4M reported on Form 4. None of these purchases or sales is dated in the last 12 months. The largest single trade was a sale of 13,316 shares of Pdf Solutions INC worth $496.2K, dated 2023-02-28. The first filing on our record is dated 2021-07-02 and the latest 2026-07-02.
Pdf Solutions INC (PDFS)
| Trade date | Code | Shares | Value as filed | Filed |
|---|---|---|---|---|
| 2021-11-12 | S, sale reported on Form 4 | 3,000 | $99.0K | 2021-11-15 |
| 2022-11-15 | S, sale reported on Form 4 | 2,500 | $74.5K | 2022-11-17 |
| 2022-11-16 | S, sale reported on Form 4 | 2,500 | $75.1K | 2022-11-17 |
| 2023-02-28 | S, sale reported on Form 4 | 13,316 | $496.2K | 2023-03-02 |
| 2023-12-12 | S, sale reported on Form 4 | 867 | $27.1K | 2023-12-14 |
| 2023-12-13 | S, sale reported on Form 4 | 4,883 | $150.7K | 2023-12-14 |
| 2025-02-24 | P, purchase reported on Form 4 | 4,000 | $92.2K | 2025-02-25 |
| 2025-05-13 | P, purchase reported on Form 4 | 7,500 | $145.9K | 2025-05-14 |
MTTR
No purchase or sale of common stock reported here; these filings cover grants, option exercises or other codes.
Everspin Technologies INC. (MRAM)
| Trade date | Code | Shares | Value as filed | Filed |
|---|---|---|---|---|
| 2021-11-17 | S, sale reported on Form 4 | 14,286 | $181.4K | 2021-11-18 |
| 2022-08-17 | S, sale reported on Form 4 | 4,100 | $31.0K | 2022-08-19 |
| 2022-08-17 | S, sale reported on Form 4 | 560 | $4.7K | 2022-08-19 |
| 2022-08-17 | S, sale reported on Form 4 | 716 | $6.0K | 2022-08-19 |
| 2022-08-18 | S, sale reported on Form 4 | 10,397 | $78.0K | 2022-08-19 |
| 2022-08-18 | S, sale reported on Form 4 | 11,440 | $87.3K | 2022-08-19 |
| 2022-08-18 | S, sale reported on Form 4 | 6,390 | $46.8K | 2022-08-19 |
Counted from the Form 4 filings this reporting owner (SEC CIK 1245081) filed on EDGAR. Values are the transaction values as filed. See every filing on EDGAR, or browse insider buying and today's insider purchases.
Source: U.S. Securities and Exchange Commission (EDGAR) and other official
government data · Updated 2026-10-12 ·
For informational purposes only, not investment advice.
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