UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): May 21, 2013

TERADYNE, INC.

(Exact Name of Registrant as Specified in Charter)

Registrant’s telephone number, including area code (978) 370-2700

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

At the Annual Meeting of Stockholders of Teradyne, Inc. (the “Company”) held on May 21, 2013 (the “Annual Meeting”), the stockholders approved both an amendment to the 2006 Equity and Cash Compensation Incentive Plan (the “Plan”) to increase the aggregate number of shares of common stock that may be issued pursuant to the Plan by 10,000,000 shares and an amendment to the 1996 Employee Stock Purchase Plan (the “ESPP”) to increase the aggregate number of shares of common stock that may be issued pursuant to the ESPP by 5,000,000 shares.

Item 5.07. Submission of Matters to a Vote of Security Holders

Teradyne, Inc. (the “Company”) held its 2013 Annual Meeting of Stockholders on May 21, 2013 (the “Annual Meeting”). At the Annual Meeting, the stockholders voted on the following proposals:

1. To elect the eight nominees named in the Company’s proxy statement filed with the Commission on April 11, 2013 to the Board of Directors to serve as directors for a one-year term. Each nominee for director was elected by a vote of the stockholders as follows:

2. To conduct an advisory vote on the compensation of the Company’s named executive officers. The compensation of the Company’s named executive officers was approved on an advisory basis by a vote of stockholders as follows:

3. To approve an amendment to the 2006 Equity and Cash Compensation Incentive Plan to increase the aggregate number of shares of common stock that may be issued pursuant to the plan by 10,000,000 shares. The amendment to the 2006 Equity and Cash Compensation Incentive Plan was approved by a vote of stockholders as follows:

4. To approve an amendment to the 1996 Employee Stock Purchase Plan to increase the aggregate number of shares of common stock that may be issued pursuant to the plan by 5,000,000 shares. The amendment to the 1996 Employee Stock Purchase Plan was approved by a vote of stockholders as follows:

5. To ratify the selection of the firm of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2013. The proposal was approved by a vote of stockholders as follows:

SIGNATURES

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 thereunto duly authorized.