Creation of 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 August 7, 2026, Teradyne, Inc. (“Teradyne” or “the Company”) entered into a Credit Agreement (the “Credit Agreement”) with PNC Bank, National Association, as administrative agent, issuing bank and swingline lender, and the several banks and other financial institutions and lenders from time to time party thereto. The Credit Agreement provides for a five-year, senior secured revolving credit facility of $1.0 billion (the “Credit Facility”). Capita…

Results of Operations and Financial Condition. On July 28, 2026, Teradyne, Inc. (“Teradyne”) issued a press release regarding its financial results for the second quarter ended June 28, 2026. Teradyne’s press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

Results of Operations and Financial Condition. On April 28, 2026, Teradyne, Inc. (“Teradyne”) issued a press release regarding its financial results for the first quarter ended March 29, 2026. Teradyne’s press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

Results of Operations and Financial Condition. On February 2, 2026, Teradyne, Inc. (“Teradyne”) issued a press release regarding its financial results for the fourth quarter ended December 31, 2025. Teradyne’s press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

Results of Operations and Financial Condition. On October 28, 2025, Teradyne, Inc. (“Teradyne”) issued a press release regarding its financial results for the third quarter ended September 28, 2025. Teradyne’s press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

Vice President, Chief Financial Officer, and Treasurer — Michelle Turner: Michelle Turner was hired as the new CFO, succeeding Sanjay Mehta.

President of Teradyne Robotics — Ujjwal Kumar: Mr. Kumar's tenure as President of Teradyne Robotics ended and he is receiving severance.

Results of Operations and Financial Condition. On July 29, 2025, Teradyne, Inc. (“Teradyne”) issued a press release regarding its financial results for the third quarter ended June 29, 2025. Teradyne’s press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

Director — Necip Sayiner, Drew Henry: Appointment of new directors to the board.

Material Modification to Rights of Security Holders. To the extent applicable, the information set forth under

The filing is about the approval of an amended compensation plan, not a management change.

The filing is about the approval of an amended compensation plan, not a management change.

Results of Operations and Financial Condition. On April 28, 2025, Teradyne, Inc. (“Teradyne”) issued a press release regarding its financial results for the first quarter ended March 30, 2025. Teradyne’s press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

President, Semiconductor Test — Richard J. Burns: Richard J. Burns is retiring from his role as President, Semiconductor Test.

Results of Operations and Financial Condition. On January 29, 2025, Teradyne, Inc. (“Teradyne”) issued a press release regarding its financial results for the fourth quarter ended December 31, 2024. Teradyne’s press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

Director — Ford Tamer: Mr. Tamer decided not to stand for re-election due to his new role as CEO of Lattice Semiconductor Corporation.

Results of Operations and Financial Condition. On October 23, 2024, Teradyne, Inc. (“Teradyne”) issued a press release regarding its financial results for the third quarter ended September 29, 2024. Teradyne’s press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

Results of Operations and Financial Condition. On July 24, 2024, Teradyne, Inc. (“Teradyne”) issued a press release regarding its financial results for the second quarter ended June 30, 2024. Teradyne’s press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

Completion of Acquisition or Disposition of Assets As previously disclosed, on November 7, 2023 Teradyne, Inc. (the “Company”) entered into an Investment Agreement (the “Investment Agreement”) with Technoprobe S.p.A. (“Technoprobe”), T-Plus S.p.A., Technoprobe’s controlling shareholder (“T-Plus”), and Teradyne International Holdings, B.V., a wholly owned indirect subsidiary of the Company (the “Investor”). Pursuant to the terms of the Investment Agreement, on May 27, 2024 (the “Closing Date”)…

Regulation FD Disclosure As previously disclosed, on November 7, 2023, concurrently with entry into the Investment Agreement, the Company entered into an agreement with Technoprobe to sell to Technoprobe its Device Interface Solutions business unit (the “DIS Divestiture”). On the Closing Date, the Company completed the DIS Divestiture for $85 million, net of cash and debt, and subject to a customary working capital adjustment. The information furnished under this

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of Registrant As previously disclosed in Teradyne, Inc.’s (the “Company’s”) filings with the Securities and Exchange Commission, the Company is party to a credit agreement dated May 1, 2020 (as amended prior to the date hereof, the “Credit Agreement”) with Truist Bank, as administrative agent and collateral agent, and the lenders party thereto. The Credit Agreement provides for a senior secured r…

Results of Operations and Financial Condition. On April 24, 2024, Teradyne, Inc. (“Teradyne”) issued a press release regarding its financial results for the first quarter ended March 31, 2024. Teradyne’s press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

Results of Operations and Financial Condition. On January 30, 2024, Teradyne, Inc. (“Teradyne”) issued a press release regarding its financial results for the fourth quarter ended December 31, 2023. Teradyne’s press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

Vice President and General Counsel — Mr. Gray: Mr. Gray is retiring as Vice President and General Counsel, with his equity awards continuing to vest under the terms of an Executive Officer Agreement.