FORM · Formfactor Inc

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $120.215 through $120.76. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $121.14 through $121.38. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $119.075 through $119.085. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $115.995 through $116.985. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $116.995 through $117.9. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $117.985 through $118.8. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

Gift of shares to a charitable foundation.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $122.25 through $123. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $121.22 through $122.04. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $123.365 through $123.39. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $117.14 through $117.87. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

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.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $115.80 through $115.84. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reporting person was granted restricted stock units ("RSUs") pursuant to a grant approved by the Board in April 2026.

If the reporting person ceases to provide services to the Issuer for any reason, all Restricted Stock Units that have not yet vested shall be forfeited without consideration except as provided in our Equity Grant Policy for Outside Directors and any other applicable agreements between the reporting person and Issuer.

RSUs vest monthly and become exercisable on the earlier of the 2027 Annual Meeting of Stockholders and May 15, 2027.

The reporting person was granted restricted stock units ("RSUs") pursuant to a grant approved by the Board in April 2026.

If the reporting person ceases to provide services to the Issuer for any reason, all Restricted Stock Units that have not yet vested shall be forfeited without consideration except as provided in our Equity Grant Policy for Outside Directors and any other applicable agreements between the reporting person and Issuer.

RSUs vest monthly and become exercisable on the earlier of the 2027 Annual Meeting of Stockholders and May 15, 2027.

The reporting person was granted restricted stock units ("RSUs") pursuant to a grant approved by the Board in April 2026.

If the reporting person ceases to provide services to the Issuer for any reason, all Restricted Stock Units that have not yet vested shall be forfeited without consideration except as provided in our Equity Grant Policy for Outside Directors and any other applicable agreements between the reporting person and Issuer.

RSUs vest monthly and become exercisable on the earlier of the 2027 Annual Meeting of Stockholders and May 15, 2027.

The reporting person was granted restricted stock units ("RSUs") pursuant to a grant approved by the Board in April 2026.

If the reporting person ceases to provide services to the Issuer for any reason, all Restricted Stock Units that have not yet vested shall be forfeited without consideration except as provided in our Equity Grant Policy for Outside Directors and any other applicable agreements between the reporting person and Issuer.

RSUs vest monthly and become exercisable on the earlier of the 2027 Annual Meeting of Stockholders and May 15, 2027.

The reporting person was granted restricted stock units ("RSUs") pursuant to a grant approved by the Board in April 2026.

If the reporting person ceases to provide services to the Issuer for any reason, all Restricted Stock Units that have not yet vested shall be forfeited without consideration except as provided in our Equity Grant Policy for Outside Directors and any other applicable agreements between the reporting person and Issuer.

RSUs vest monthly and become exercisable on the earlier of the 2027 Annual Meeting of Stockholders and May 15, 2027.

The reporting person was granted restricted stock units ("RSUs") pursuant to a grant approved by the Board in April 2026.

If the reporting person ceases to provide services to the Issuer for any reason, all Restricted Stock Units that have not yet vested shall be forfeited without consideration except as provided in our Equity Grant Policy for Outside Directors and any other applicable agreements between the reporting person and Issuer.

RSUs vest monthly and become exercisable on the earlier of the 2027 Annual Meeting of Stockholders and May 15, 2027.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $122.23 through $123.19. Reporting person undertakes to provide, upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $128.37 through $129.07. Reporting person undertakes to provide, upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $123.28 through $124.17. Reporting person undertakes to provide, upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $129.22 through $129.42. Reporting person undertakes to provide, upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $124.22 through $125.20. Reporting person undertakes to provide, upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $126.37 through $127.14. Reporting person undertakes to provide, upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $125.26 through $126.04. Reporting person undertakes to provide, upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

The Restricted Stock Units granted on August 7, 2023 vest in twelve (12) quarterly installments beginning on November 7, 2023 and ending on August 7, 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.

Represents the number of shares withheld upon vesting of restricted stock units to cover tax withholding obligations.

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.

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.

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.

Represents the number of shares withheld upon vesting of restricted stock units to cover tax withholding obligations.

Represents the number of shares withheld upon vesting of restricted stock units to cover tax withholding obligations.

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.

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.