FormFactor Inc
Ownership
Ownership Structure
Who owns FormFactor Inc (FORM)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.2% of the shares are freely tradable; institutional investors hold 98.8%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 13.42 | 10,484,409 | -14.4 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 6.71 | 5,242,203 | -10.8 | 06/30/2026 |
| Earnest Partners LLC | 4.82 | 3,763,214 | -22.8 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.50 | 3,515,254 | +1.2 | 06/30/2026 |
| State Street Corp | 3.30 | 2,581,477 | -11.8 | 06/30/2026 |
| Polar Capital Holdings PLC | 2.75 | 2,146,098 | -6.4 | 06/30/2026 |
| Geode Capital Management, LLC | 2.35 | 1,833,001 | -16.2 | 06/30/2026 |
| Bank of America Corp | 2.28 | 1,783,638 | -28.1 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 5.96 | 4,653,915 | +0.0 | 09/30/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.18 | 2,482,002 | +0.3 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Slessor Mike | CEO | 455,596 | 44,101,693 $ | Oct 14, 2026 | direct |
| Steven-Waiss Kelley | Director | 24,426 | 2,364,437 $ | Sep 3, 2026 | direct |
| McKinnis Aric Brendan | CFO, SVP Global Finance | 14,152 | 1,369,914 $ | Aug 6, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 14, 2026 | Slessor Mike | CEO | Sell | 1,200 | 125.92 | 151,104 |
| Oct 14, 2026 | Slessor Mike | CEO | Sell | 7,703 | 125.36 | 965,648 |
| Oct 14, 2026 | Slessor Mike | CEO | Sell | 2,195 | 124.23 | 272,685 |
| Sep 16, 2026 | Slessor Mike | CEO | Sell | 1,000 | 105.80 | 105,800 |
| Sep 16, 2026 | Slessor Mike | CEO | Sell | 7,773 | 105.12 | 817,098 |
| Sep 16, 2026 | Slessor Mike | CEO | Sell | 8,737 | 104.26 | 910,920 |
| Sep 3, 2026 | Steven-Waiss Kelley | Director | Sell | 2,100 | 96.10 | 201,810 |
| Aug 14, 2026 | Slessor Mike | CEO | Sell | 686 | 133.33 | 91,464 |
| Aug 14, 2026 | Slessor Mike | CEO | Sell | 5,535 | 132.50 | 733,388 |
| Aug 14, 2026 | Slessor Mike | CEO | Sell | 1,125 | 131.65 | 148,106 |
| Aug 14, 2026 | Slessor Mike | CEO | Sell | 3,282 | 130.54 | 428,432 |
| Aug 14, 2026 | Slessor Mike | CEO | Sell | 2,892 | 129.55 | 374,659 |
| Aug 14, 2026 | Slessor Mike | CEO | Sell | 2,482 | 128.72 | 319,483 |
| Aug 7, 2026 | Slessor Mike | CEO | Other | 3,288 | 117.39 | 385,978 |
| Aug 7, 2026 | Slessor Mike | CEO | Other | 5,908 | 0.00 | – |
| Aug 7, 2026 | Slessor Mike | CEO | Other | 78,908 | 117.39 | 9,263,010 |
| Aug 7, 2026 | Slessor Mike | CEO | Other | 141,792 | 0.00 | – |
| Aug 6, 2026 | Slessor Mike | CEO | Other | 3,357 | 115.21 | 386,760 |
| Aug 6, 2026 | Slessor Mike | CEO | Other | 6,031 | 0.00 | – |
| Aug 6, 2026 | McKinnis Aric Brendan | CFO, SVP Global Finance | Other | 274 | 115.21 | 31,568 |
| Aug 6, 2026 | McKinnis Aric Brendan | CFO, SVP Global Finance | Other | 1,099 | 0.00 | – |
| Aug 5, 2026 | Slessor Mike | CEO | Other | 2,028 | 114.44 | 232,084 |
| Aug 5, 2026 | Slessor Mike | CEO | Other | 3,644 | 0.00 | – |
| Aug 5, 2026 | McKinnis Aric Brendan | CFO, SVP Global Finance | Other | 130 | 114.44 | 14,877 |
| Aug 5, 2026 | McKinnis Aric Brendan | CFO, SVP Global Finance | Other | 521 | 0.00 | – |
| Jul 15, 2026 | Slessor Mike | CEO | Sell | 868 | 121.30 | 105,288 |
| Jul 15, 2026 | Slessor Mike | CEO | Sell | 300 | 120.58 | 36,174 |
| Jul 15, 2026 | Slessor Mike | CEO | Sell | 170 | 119.08 | 20,244 |
| Jul 15, 2026 | Slessor Mike | CEO | Sell | 706 | 118.21 | 83,456 |
| Jul 15, 2026 | Slessor Mike | CEO | Sell | 1,650 | 117.39 | 193,694 |
| Jul 15, 2026 | Slessor Mike | CEO | Sell | 1,041 | 116.56 | 121,339 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 3, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.