X0508 4 2025-11-06 0 0001039399 FORMFACTOR INC FORM 0001660926 McKinnis Aric Brendan 7005 SOUTHFRONT ROAD LIVERMORE CA 94551 0 1 0 0 CFO, SVP Global Finance 0 Restricted Stock Units 0 2025-11-06 4 A 0 13188 0 A Common Stock 13188 13188 D The Restricted Stock Units granted on November 6, 2025 vest in twelve (12) quarterly installments beginning on February 6, 2026 and ending on November 6, 2028 and will be settled into shares of common stock on or following the vesting dates. If the reporting person's employment is terminated for any reason before an applicable Vesting Date, all restricted stock units that have not yet vested shall be forfeited without consideration, except as provided in the change of control severance agreement and any other agreements regarding equity vesting and exercisability between the reporting person and Issuer, which agreements or form agreements are filed with the SEC. /s/ Stan Finkelstein, Attorney-in-fact for Aric McKinnis 2025-11-07