SEC Form 4 · Updated Daily
FORM
— FORMFACTOR, INC. OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| SLESSOR MIKE | Director · Officer | 464,499 | 2026-10-14 | S |
| LUDWIG MICHAEL M | Director | 265,387 | 2018-02-21 | M |
| HATSUKANO YOSHIKAZU | Officer | 130,316 | 2006-02-07 | M |
| MERKADEAU STUART L | Officer | 81,812 | 2015-05-06 | M |
| LINK RAYMOND A | Director | 66,225 | 2023-05-30 | M |
| Shahar Shai | Officer | 57,610 | 2025-08-07 | M |
| EVERETT G CARL JR | Director | 56,864 | 2013-05-07 | J |
| ZELLNER MICHAEL W | Director | 41,875 | 2019-12-06 | M |
| PRESTRIDGE JAMES A | Director | 39,748 | 2011-08-31 | S |
| BRONSON JOSEPH R | Director | 35,887 | 2007-01-03 | M |
| ELDRIDGE BENJAMIN N | Officer | 32,070 | 2006-02-02 | S |
| St Dennis Thomas | Director | 29,073 | 2026-06-15 | S |
| DeLateur Richard | Director | 25,000 | 2019-07-25 | M |
| STEVEN-WAISS KELLEY | Director | 24,426 | 2026-09-03 | S |
| MATHEWS PETER B | Officer | 22,249 | 2006-02-06 | M |
| ROGAS EDWARD JR | Director | 22,098 | 2021-05-17 | M |
| Ruscev Mario | Director · Officer | 16,205 | 2010-02-02 | M |
| Bahrami Homa | Director | 15,000 | 2010-06-01 | M |
| Titinger Jorge | Director | 14,836 | 2026-05-15 | A |
| McKinnis Aric Brendan | Officer | 14,426 | 2026-08-06 | M |
| WAGNER HARVEY A | Director | 12,000 | 2010-06-01 | M |
| WHITE BRIAN C | Director | 8,653 | 2026-05-20 | S |
| KHANDROS IGOR Y | Director · Officer | 8,500 | 2008-04-03 | M |
| BREWER KEVIN J | Officer | 8,105 | 2026-02-11 | S |
| Obregon-Jimenez Rebeca | Director | 7,875 | 2026-05-21 | S |
| MAIER LOTHAR | Director | 6,770 | 2024-05-14 | S |
| CAMPBELL THOMAS J | Director | 6,000 | 2009-06-01 | M |
| Rhodes Sheri | Director | 5,375 | 2026-06-02 | S |
| Vernet Jean B | Officer | 5,000 | 2010-04-29 | M |
| FOSTER RONALD C | Officer | 4,683 | 2007-06-15 | M |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-10-14 | SLESSOR MIKE | Open-market sale | 1,200 | $125.92 | 455,596 |
| 2026-10-14 | SLESSOR MIKE | Open-market sale | 7,703 | $125.36 | 456,796 |
| 2026-10-14 | SLESSOR MIKE | Open-market sale | 2,195 | $124.23 | 464,499 |
| 2026-09-16 | SLESSOR MIKE | Open-market sale | 1,000 | $105.80 | 466,694 |
| 2026-09-16 | SLESSOR MIKE | Open-market sale | 7,773 | $105.12 | 467,694 |
| 2026-09-16 | SLESSOR MIKE | Open-market sale | 8,737 | $104.26 | 475,467 |
| 2026-09-03 | STEVEN-WAISS KELLEY | Open-market sale | 2,100 | $96.10 | 24,426 |
| 2026-08-14 | SLESSOR MIKE | Open-market sale | 686 | $133.33 | 484,204 |
| 2026-08-14 | SLESSOR MIKE | Open-market sale | 5,535 | $132.50 | 484,890 |
| 2026-08-14 | SLESSOR MIKE | Open-market sale | 1,125 | $131.65 | 490,425 |
| 2026-08-14 | SLESSOR MIKE | Open-market sale | 3,282 | $130.54 | 491,550 |
| 2026-08-14 | SLESSOR MIKE | Open-market sale | 2,892 | $129.55 | 494,832 |
| 2026-08-14 | SLESSOR MIKE | Open-market sale | 2,482 | $128.72 | 497,724 |
| 2026-08-07 | SLESSOR MIKE | Option exercise (derivative) | 5,908 | $0.00 | 0 |
| 2026-08-07 | SLESSOR MIKE | Option exercise (derivative) | 141,792 | $0.00 | 0 |
| 2026-08-07 | SLESSOR MIKE | Grant / award (derivative) | 141,792 | $0.00 | 141,792 |
| 2026-08-07 | SLESSOR MIKE | Tax withholding | 3,288 | $117.39 | 500,206 |
| 2026-08-07 | SLESSOR MIKE | Option exercise | 5,908 | $0.00 | 503,494 |
| 2026-08-07 | SLESSOR MIKE | Tax withholding | 78,908 | $117.39 | 497,586 |
| 2026-08-07 | SLESSOR MIKE | Option exercise | 141,792 | $0.00 | 576,494 |
| 2026-08-06 | McKinnis Aric Brendan | Option exercise (derivative) | 1,099 | $0.00 | 9,891 |
| 2026-08-06 | McKinnis Aric Brendan | Tax withholding | 274 | $115.21 | 14,152 |
| 2026-08-06 | McKinnis Aric Brendan | Option exercise | 1,099 | $0.00 | 14,426 |
| 2026-08-06 | SLESSOR MIKE | Option exercise (derivative) | 6,031 | $0.00 | 48,248 |
| 2026-08-06 | SLESSOR MIKE | Tax withholding | 3,357 | $115.21 | 434,702 |
| 2026-08-06 | SLESSOR MIKE | Option exercise | 6,031 | $0.00 | 438,059 |
| 2026-08-06 | McKinnis Aric Brendan | Grant / award (derivative) | 6,924 | $0.00 | 6,924 |
| 2026-08-06 | SLESSOR MIKE | Grant / award (derivative) | 27,696 | $0.00 | 27,696 |
| 2026-08-05 | McKinnis Aric Brendan | Option exercise (derivative) | 521 | $0.00 | 2,084 |
| 2026-08-05 | McKinnis Aric Brendan | Tax withholding | 130 | $114.44 | 13,327 |
| 2026-08-05 | McKinnis Aric Brendan | Option exercise | 521 | $0.00 | 13,457 |
| 2026-08-05 | SLESSOR MIKE | Option exercise (derivative) | 3,644 | $0.00 | 14,576 |
| 2026-08-05 | SLESSOR MIKE | Tax withholding | 2,028 | $114.44 | 432,028 |
| 2026-08-05 | SLESSOR MIKE | Option exercise | 3,644 | $0.00 | 434,056 |
| 2026-07-15 | SLESSOR MIKE | Open-market sale | 868 | $121.30 | 430,412 |
| 2026-07-15 | SLESSOR MIKE | Open-market sale | 300 | $120.58 | 431,280 |
| 2026-07-15 | SLESSOR MIKE | Open-market sale | 170 | $119.08 | 431,580 |
| 2026-07-15 | SLESSOR MIKE | Open-market sale | 706 | $118.21 | 431,750 |
| 2026-07-15 | SLESSOR MIKE | Open-market sale | 1,650 | $117.39 | 432,456 |
| 2026-07-15 | SLESSOR MIKE | Open-market sale | 1,041 | $116.56 | 434,106 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.