X0508 4 2026-02-05 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 2026-02-05 4 M 0 521 0 A 13421 D Common Stock 2026-02-05 4 F 0 162 83.87 D 13259 D Common Stock 2026-02-06 4 M 0 1099 0 A 14358 D Common Stock 2026-02-06 4 F 0 336 90.29 D 14022 D Restricted Stock Units 0 2026-02-05 4 M 0 521 0 D Common Stock 521 3126 D Restricted Stock Units 0 2026-02-06 4 M 0 1099 0 D Common Stock 1099 12089 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. Includes 626 shares acquired from the Issuer's Employee Stock Purchase Plan on January 30, 2026. The Restricted Stock Units granted on August 5, 2024 vest in twelve (12) quarterly installments beginning on November 5, 2024 and ending on August 5, 2027 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. The Restricted Stock Units granted on November 6, 2025 vest in twelve (12) quarterly installments beginning on February 6, 2025 and ending on November 6, 2028 and will be settled into shares of common stock on or following the vesting dates. /s/ Stan Finkelstein, Attorney-in-fact for Aric McKinnis 2026-02-09