TER Teradyne Inc

Registration Nos. 333-177246, 333-32547, 333-155564, 333-149017, 333-73700, 033-64683 and 033-55123

As filed with the Securities and Exchange Commission on May 6, 2022

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-177246

POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-32547

POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-155564

POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-149017

POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-73700

POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 033-64683

POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 033-55123

UNDER

THE SECURITIES ACT OF 1933

600 Riverpark Drive

North Reading, Massachusetts 01864

(Address, including zip code, of registrant’s principal executive offices)

LitePoint Corporation 2002 Stock Plan, as amended

Teradyne, Inc. 1996 Non-Employee Director Stock Option Plan

Eagle Test Systems, Inc. 2003 Stock Option and Grant Plan

Eagle Test Systems, Inc. 2006 Stock Option and Incentive Plan

Nextest Systems Corporation 1998 Equity Incentive Plan, as amended

Nextest Systems Corporation 2006 Equity Incentive Plan

Genrad, Inc. 1991 Equity Incentive Plan

Genrad, Inc. 1991 Directors’ Stock Option Plan

Genrad, Inc. 1997 Non-Qualified Employee Stock Option Plan

Non-Statutory Stock Option Agreement by and between Robert M. Dutkowsky and Genrad, Inc.

Megatest Corporation Director Stock Option Plan

Megatest Corporation 1990 Stock Option Plan

Teradyne, Inc. 1979 Employee Stock Purchase Plan

Teradyne, Inc. 1991 Employee Stock Option Plan

(Full title of the plan)

Charles Gray

Vice President, General Counsel, and Secretary

Teradyne, Inc.

600 Riverpark Drive

North Reading, Massachusetts 01864

(978) 370-2700

(Name and address, and telephone number, including area code, of agent for service)

Copies to:

Marko Zatylny

Ropes & Gray LLP

Prudential Tower

800 Boylston Street

Boston, Massachusetts 02110

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

DEREGISTRATION OF SECURITIES

This Post-Effective Amendment (this “Post-Effective Amendment”) relates to the following Registration Statements of Teradyne, Inc., a Massachusetts corporation (“Teradyne”) on Form S-8 (the “Registration Statements”):

Teradyne is no longer issuing securities under the plans covered by the Registration Statements. Accordingly, by means of this Post-Effective Amendment, Teradyne hereby terminates the effectiveness of the Registration Statements and deregisters any securities that had been registered for issuance but remain unsold under the Registration Statements as of the date hereof.