Results of Operations and Financial Condition. On July 29, 2026, FormFactor, Inc. (“FormFactor”) issued a press release announcing its financial results for the second quarter of fiscal 2026 that ended on June 27, 2026. A copy of the press release is furnished as Exhibit 99.01 to this report and is incorporated herein by reference. This information and the accompanying Exhibit 99.01 shall not be incorporated by reference into any filing of FormFactor with the Securities and Exchange Commissio…

Amendment to the equity incentive plan to increase share reserve.

Results of Operations and Financial Condition. On April 29, 2026, FormFactor, Inc. (“FormFactor”) issued a press release announcing its financial results for the first quarter of fiscal 2026 that ended on March 28, 2026. A copy of the press release is furnished as Exhibit 99.01 to this report and is incorporated herein by reference. This information and the accompanying Exhibit 99.01 shall not be incorporated by reference into any filing of FormFactor with the Securities and Exchange Commissi…

Director — Kevin Brewer: Kevin Brewer will not stand for re-election as a director.

Results of Operations and Financial Condition. On February 4, 2026, FormFactor, Inc. (“FormFactor”) issued a press release announcing its financial results for the fourth quarter of fiscal 2025 that ended on December 27, 2025. A copy of the press release is furnished as Exhibit 99.01 to this report and is incorporated herein by reference. This information and the accompanying Exhibit 99.01 shall not be incorporated by reference into any filing of FormFactor with the Securities and Exchange Co…

SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. FORMFACTOR, INC. Date: January 08, 2026 By: /s/ Alan Chan Name: Alan Chan Title: Senior Vice President, Chief Legal Officer and Secretary

Costs Associated with Exit or Disposal Activities. On January 5, 2026, FormFactor, Inc. (“we”, “the Company” or “FormFactor”) adopted restructuring plans that are intended to better align cost structure and support gross margin improvement to the Company’s target financial model, while also aligning manufacturing capabilities with current and anticipated business needs and the Company's strategic priorities. As part of this restructuring plan, the Company is consolidating the manufacturing fa…

Results of Operations and Financial Condition. On October 29, 2025, FormFactor, Inc. (“FormFactor”) issued a press release announcing its financial results for the third quarter of fiscal 2025 that ended on September 27, 2025. A copy of the press release is furnished as Exhibit 99.01 to this report and is incorporated herein by reference. This information and the accompanying Exhibit 99.01 shall not be incorporated by reference into any filing of FormFactor with the Securities and Exchange Co…

CFO — Shai Shahar: The CFO resigned but an internal successor was appointed immediately, and the outgoing executive remains as an advisor, indicating an orderly succession rather than a sudden loss of leadership.

Results of Operations and Financial Condition. On July 30, 2025, FormFactor, Inc. (“FormFactor”) issued a press release announcing its financial results for the second quarter of fiscal 2025 that ended on June 28, 2025. A copy of the press release is furnished as Exhibit 99.01 to this report and is incorporated herein by reference. This information and the accompanying Exhibit 99.01 shall not be incorporated by reference into any filing of FormFactor with the Securities and Exchange Commissio…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in

Entry into a Material Definitive Agreement. On July 29, 2025, FormFactor, Inc. (“FormFactor”), as Borrower, entered into that certain Revolving Credit Agreement (the “Credit Agreement”) by and among the Borrower, Wells Fargo Bank, National Association, as Administrative Agent (the “Administrative Agent”), and the lenders party thereto from time to time. The Credit Agreement provides for a revolving credit facility in an aggregate principal amount of up to $150,000,000 (the “Facility”) with an…

The filing describes the approval of an amendment to an equity incentive plan, which is a compensation matter rather than a change in management personnel.

Results of Operations and Financial Condition. On April 30, 2025, FormFactor, Inc. (“FormFactor”) issued a press release announcing its financial results for the first quarter of fiscal 2025 that ended on March 29, 2025. A copy of the press release is furnished as Exhibit 99.01 to this report and is incorporated herein by reference.

Results of Operations and Financial Condition. On February 5, 2025, FormFactor, Inc. (“FormFactor”) issued a press release announcing its financial results for the fourth quarter of fiscal 2024 that ended on December 28, 2024. A copy of the press release is furnished as Exhibit 99.01 to this report and is incorporated herein by reference.

Results of Operations and Financial Condition. On October 30, 2024, FormFactor, Inc. (“FormFactor”) issued a press release announcing its financial results for the third quarter of fiscal 2024 that ended on September 28, 2024. A copy of the press release is furnished as Exhibit 99.01 to this report and is incorporated herein by reference.

Results of Operations and Financial Condition. On July 31, 2024, FormFactor, Inc. (“FormFactor”) issued a press release announcing its financial results for the second quarter of fiscal 2024 that ended on June 29, 2024. A copy of the press release is furnished as Exhibit 99.01 to this report and is incorporated herein by reference.

Results of Operations and Financial Condition. On May 1, 2024, FormFactor, Inc. (“FormFactor”) issued a press release announcing its financial results for the first quarter of fiscal 2024 that ended on March 30, 2024. A copy of the press release is furnished as Exhibit 99.01 to this report and is incorporated herein by reference.

Director — Kevin Brewer: The filing discloses the appointment of a new director to fill a vacancy created by a board size increase, alongside a routine non-re-election of a sitting director, which constitutes standard board governance activity rather than a loss of senior executive management.