X0508 4 2025-11-05 0 0001039399 FORMFACTOR INC FORM 0001590177 SLESSOR MIKE 7005 SOUTHFRONT ROAD LIVERMORE CA 94551 1 1 0 0 CEO 0 Common Stock 2025-11-05 4 M 0 3644 A 538392 D Common Stock 2025-11-05 4 F 0 2025 55.36 D 536367 D Common Stock 2025-11-06 4 M 0 6031 A 542398 D Common Stock 2025-11-06 4 F 0 3351 54.22 D 539047 D Restricted Stock Units 0 2025-11-05 4 M 0 3644 0 D Common Stock 3644 25508 D Restricted Stock Units 0 2025-11-06 4 M 0 6031 0 D Common Stock 6031 66341 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 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 August 6, 2025 vest in twelve (12) quarterly installments beginning on November 6, 2025 and ending on August 6, 2028 and will be settled into shares of common stock on or following the vesting dates. /s/ Stan Finkelstein, Attorney-in-fact for Mike Slessor 2025-11-07