Formfactor, Inc.
A maker of advanced probe cards and test systems that let chipmakers check silicon wafers for defects before they are cut into individual chips. Its MicroSpring technology, built from tiny MEMS contacts, can test everything from phone processors to high-bandwidth memory, and its systems even reach into cryogenic labs and quantum computing. Founded in 1993 by former IBM researcher Igor Khandros in a small New York lab, the company got its start with a springy wire interconnect and moved to Livermore, California, two years later.
Granted 580.8K · Sold 223.3K
Granted 8.6K · Sold 1.6K
Granted 207.2K · Sold 81.0K
Granted 22.3K · Sold 44.1K
Granted 28.3K · Sold 31.6K
Granted 22.8K · Sold 12.8K
Granted 6.9K · Sold 3.5K
Granted 18.5K · Sold 14.3K
Granted 11.1K · Sold 3.0K
Granted 22.3K · Sold 26.3K
Granted 10.6K · Sold 99.7K
Granted 22.3K · Sold 27.3K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Slessor MikeCEO, Director · 138 transactions | +6.6% | 445.6K | 580.8K | — | 223.3K |
| Link Raymond ADirector · 3 transactions | +11.9% | 66.2Kas of May 2023 | 8.6K | — | 1.6K |
| Shahar ShaiCFO, SVP Global Finance · 63 transactions | +34.5% | 57.6Kas of Aug 2025 | 207.2K | — | 81.0K |
| St Dennis ThomasDirector · 17 transactions | -38.5% | 28.3K | 22.3K | — | 44.1K |
| Steven-Waiss KelleyDirector · 14 transactions | +0.7% | 25.2K | 28.3K | — | 31.6K |
| Titinger JorgeDirector · 8 transactions | — | 14.8K | 22.8K | — | 12.8K |
| McKinnis Aric BrendanCFO, SVP Global Finance · 19 transactions | — | 13.1K | 6.9K | — | 3.5K |
| White Brian CDirector · 8 transactions | — | 8.7K | 18.5K | — | 14.3K |
| Brewer Kevin JDirector · 4 transactions | — | 8.1K | 11.1K | — | 3.0K |
| Obregon-Jimenez RebecaDirector · 11 transactions | +10.9% | 7.9K | 22.3K | — | 26.3K |
| Maier LotharDirector · 3 transactions | -92.6% | 6.8Kas of May 2024 | 10.6K | — | 99.7K |
| Rhodes SheriDirector · 8 transactions | -3.3% | 5.4K | 22.3K | — | 27.3K |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over the last 5 years: -568.5K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.