Andrzej Strojwas is CTO at PDF SOLUTIONS INC (PDFS). They have made 5 open-market trades across 1 company since 2022, most recently 2026-08-31.
CIK 0001892306
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 5 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| PDFS | 90,965 | $3.6M |
Shares reported on the most recent Form 4, priced at the 2026-09-01 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| PDFS | SELL | 2026-08-31 | 2026-09-01 | $44.41 | $151K | +2.6% | +28.0% | — |
| PDFS | SELL | 2024-12-17 | 2024-12-19 | $30.38 | $372K | -3.4% | +0.7% | -24.3% |
| PDFS | SELL | 2024-12-16 | 2024-12-17 | $30.85 | $310K | -10.2% | -10.3% | -28.7% |
| PDFS | SELL | 2023-03-08 | 2023-03-08 | $38.45 | $97K | +3.7% | +10.1% | +10.7% |
| PDFS | SELL | 2022-11-30 | 2022-12-02 | $31.00 | $618K | -1.9% | -11.0% | +19.6% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.