X0508 4 2025-12-02 0 0001039399 FORMFACTOR INC FORM 0001660926 McKinnis Aric Brendan 7005 SOUTHFRONT ROAD LIVERMORE CA 94551 0 1 0 0 CFO, SVP Global Finance 0 Common Stock 2025-12-02 4 M 0 773 0 A 12467 D Common Stock 2025-12-02 4 F 0 193 56.04 D 12274 D Restricted Stock Units 0 2025-12-02 4 M 0 773 0 D Common Stock 773 1546 D These shares of common stock reflect the settlement of restricted stock units of the Issuer. Each Restricted Stock Unit (RSU) is convertible into a share of common stock on a 1-for-1 basis. Represents the number of shares withheld upon vesting of restricted stock units to cover tax withholding obligations. The Restricted Stock Units granted on June 2, 2023 vest in twelve (12) quarterly installments beginning on September 2, 2023 and ending on June 2, 2026 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 2025-12-03