FormFactor
Builds custom probe cards and systems for semiconductor test and measurement.
$101.76
After-hours close−0.01 (−0.01%)
At close$101.77(−7.67%)
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Breakdown13F · Form 4
Institutions 111.55%Insiders 0.85%
A 13F quarter can total more than the shares outstanding — sub-advisers file the same block twice, and a filer's own share count can be a quarter stale. No split is drawn from it.
Shares outstanding 77.95M · Float 77.38M · 99.3% free float
Institutions13F, as of Jun 30, 2026
526 holders · 86.96M shares · 161 new positions · 303 increased · 172 reduced · 50 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 10.48M | 13.45% | −1.76M | Aug 7, 2026 |
| Vanguard Portfolio Management LLC | 5.24M | 6.72% | −637.8K | Aug 13, 2026 |
| Earnest Partners LLC | 3.76M | 4.83% | −1.11M | Aug 13, 2026 |
| Vanguard Capital Management LLC | 3.52M | 4.51% | +42.8K | Aug 13, 2026 |
| State Street Corp | 2.58M | 3.31% | −346.7K | Aug 7, 2026 |
| Polar Capital Holdings PLC | 2.15M | 2.75% | −146.2K | Aug 14, 2026 |
| Geode Capital Management, LLC | 1.83M | 2.35% | −354.9K | Aug 12, 2026 |
| Bank of America Corp /DE/ | 1.78M | 2.29% | −697.4K | Aug 14, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Vanguard Portfolio Management | 7.61% | 5.94M | 13G | Apr 29, 2026 ↗ |
| Earnest Partners LLC | 6.30% | 4.88M | 13G | May 15, 2026 ↗ |
| Vanguard Capital Management | 5.21% | 4.07M | 13G | Apr 29, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Mike Slessor | director, officer: CEO | 484.2K | 0.62% | Aug 17, 2026 |
| Shai Shahar | officer: CFO, SVP Global Finance | 56.0K | 0.07% | Aug 8, 2025 |
| Thomas st Dennis | director | 28.3K | 0.04% | Jun 16, 2026 |
| Kelley Steven-Waiss | director | 26.5K | 0.03% | May 19, 2026 |
| Jorge Titinger | director | 14.8K | 0.02% | May 19, 2026 |
| Aric Brendan McKinnis | officer: CFO, SVP Global Finance | 14.2K | 0.02% | Aug 7, 2026 |
| Rebeca Obregon-Jimenez | director | 13.1K | 0.02% | Aug 13, 2025 |
| Brian C. White | director | 8.7K | 0.01% | May 21, 2026 |
| Kevin J. Brewer | director | 8.1K | 0.01% | Feb 12, 2026 |
| Sheri Rhodes | director | 5.4K | 0.01% | Jun 4, 2026 |
1 ten-percent owner holds 2.00M shares by Form 4, outside the officers-and-directors figure above · 22 people have not refiled in the last 18 months (774.8K shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 14, 2026 | Mike Slessordirector, officer: CEO | Sale · 6 lots | 16,002 | $130.95 | 484,204 |
| Jul 15, 2026 | Mike Slessordirector, officer: CEO | Sale · 6 lots | 4,735 | $118.31 | 430,412 |
| Jun 15, 2026 | Thomas st Dennisdirector | Sale | 2,800 | $151.49 | 29,073 |
| Jun 10, 2026 | Mike Slessordirector, officer: CEO | Sale · 7 lots | 11,890 | $121.35 | 435,147 |
| Jun 2, 2026 | Sheri Rhodesdirector | Sale | 6,328 | $125.40 | 5,375 |
| May 21, 2026 | Rebeca Obregon-Jimenezdirector | Sale | 3,828 | $126.48 | 7,875 |
| May 19, 2026 | Thomas st Dennisdirector | Sale | 1,000 | $115.84 | 31,873 |
| May 20, 2026 | Brian C. Whitedirector | Sale | 3,250 | $126.00 | 8,653 |
| May 15, 2026 | Kelley Steven-Waissdirector | Sale | 5,400 | $125.60 | 25,179 |
| May 13, 2026 | Jorge Titingerdirector | Sale | 4,009 | $128.79 | 13,489 |
CongressHouse and Senate disclosures
Not reported.