SC TO-T/A

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE TO

(Rule 14d-100)

Tender Offer Statement under Section 14(d)(1) or 13(e)(1)

of the Securities Exchange Act of 1934

(Amendment No. 1)

NEXTEST SYSTEMS CORPORATION

(Name of Subject Company (Issuer))

TERADYNE, INC.

NAC EQUIPMENT CORPORATION

(Names of Filing Persons (Offerors))

Common Stock, par value $0.001

(Title of Class of Securities)

653339101

(CUSIP Number of Class of Securities)

Eileen Casal, Esq.

600 Riverpark Drive

North Reading, Massachusetts 01864

(978) 370-2700

(Name, Address and Telephone Number of Person Authorized to Receive

Notices and Communications on Behalf of Filing Persons)

with a copy to:

Jay E. Bothwick

Wilmer Cutler Pickering Hale and Dorr LLP

60 State Street

Boston, Massachusetts 02109

(617) 526-6000

CALCULATION OF FILING FEE
Transaction valuation*	Amount of filing fee**
$409,579,060	$12,575

* Estimated for purposes of calculating the amount of the filing fee only, in accordance with Rule 0-11(d) under the U.S. Securities Exchange Act of 1934, as amended (the “Exchange Act”). The transaction valuation was calculated by multiplying the offer price of $20.00 per share by the number of shares of common stock, par value $0.001 per share (“Shares”), of Nextest Systems Corporation (“Nextest”) outstanding on a fully diluted basis as of December 11, 2007 as represented by Nextest in the Agreement and Plan of Merger, dated as of December 11, 2007, among Teradyne, Inc. (“Teradyne”), NAC Equipment Corporation (the “Offeror”) and Nextest, consisting of (a) 17,998,270 Shares issued and outstanding, (b) 1,970,283 Shares subject to issuance upon exercise of outstanding options and (c) 510,400 Shares subject to outstanding restricted stock units.

** The amount of the filing fee, calculated in accordance with Section 13(e) of the Exchange Act, equals $30.70 per million dollars of the transaction valuation.

x Check the box if any part of the fee is offset as provided by Rule 0-11(a)(2) and identify the filing with which the offsetting fee was previously paid. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

Amount Previously Paid:	$12,575	Filing Party:	Teradyne, Inc. and NAC Equipment Corporation
Form or Registration No.:	Schedule TO	Date Filed:	December 21, 2007

¨ Check the box if the filing relates solely to preliminary communications made before the commencement of a tender offer.

Check the appropriate boxes below to designate any transactions to which the statement relates:

x third-party tender offer subject to Rule 14d-1.

¨ issuer tender offer subject to Rule 13e-4.

¨ going-private transaction subject to Rule 13e-3.

¨ amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the results of the tender offer: ¨

This Amendment No. 1 (“Amendment No. 1”) amends and supplements the Tender Offer Statement on Schedule TO originally filed with the U.S. Securities and Exchange Commission on December 21, 2007 (the “Schedule TO”), by Teradyne, Inc., a Massachusetts corporation (“Teradyne”), and NAC Equipment Corporation, a Delaware corporation (“Offeror”) and a wholly owned subsidiary of Teradyne, relating to the offer by Offeror to purchase all of the outstanding shares of common stock, par value $0.001 per share (the “Shares”), of Nextest Systems Corporation, a Delaware corporation ( “Nextest”), at a price per share of $20.00, net to the seller in cash, without interest and subject to any required withholdings of taxes, upon the terms and subject to the conditions set forth in the Offer to Purchase dated December 21, 2007 (the “Offer to Purchase”) and in the related Letter of Transmittal (which, together with any amendments or supplements to the Offer to Purchase and the Letter of Transmittal, collectively constitute the “Offer”). The Offer is made pursuant to the Agreement and Plan of Merger, dated as of December 11, 2007, among Teradyne, the Offeror and Nextest.

All capitalized terms used in this Amendment No. 1 without definition have the meanings ascribed to them in the Schedule TO or the Offer to Purchase.

The information in the Offer to Purchase and the related Letter of Transmittal is incorporated in this Amendment No. 1 by reference to all of the applicable items in the Schedule TO, except that such information is amended and supplemented to the extent specifically provided in this Amendment No. 1.

Item 11. Additional Information.

Item 11 of the Schedule TO is hereby amended and supplemented by adding the following text thereto:

“As previously indicated, Teradyne filed a Premerger Notification and Report Form under the HSR Act with the FTC and the Antitrust Division in connection with the purchase of Shares in the Offer and the Merger. The FTC granted early termination of the waiting period with respect to the Offer and the Merger under the HSR Act.”

Item 12. Exhibits.

Item 12 of the Schedule TO is hereby amended and supplemented by adding the following text thereto:

(a)(5)(E) Joint Press Release Issued by Teradyne and Nextest, dated January 15, 2008, announcing early termination of the waiting period under the HSR Act.

SIGNATURE

After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: January 15, 2008

TERADYNE, INC.
By:	/S/    MICHAEL A. BRADLEY
	Name: Michael A. Bradley Title: CEO and President

NAC EQUIPMENT CORPORATION
By:	/S/    MICHAEL A. BRADLEY
	Name: Michael A. Bradley Title: President

EXHIBIT INDEX

Exhibit No.
(a)(1)(A)*	Offer to Purchase, dated December 21, 2007.
(a)(1)(B)*	Form of Letter of Transmittal.
(a)(1)(C)*	Form of Notice of Guaranteed Delivery.
(a)(1)(D)*	Form of Letter from Goldman, Sachs & Co. to Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees.
(a)(1)(E)*	Form of Letter from Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees to Clients.
(a)(1)(F)*	Form of Guidelines for Certification of Taxpayer Identification Number on Substitute Form W-9.
(a)(5)(A)*	Joint Press Release Issued by Teradyne and Nextest, dated December 12, 2007, announcing the execution of the Agreement and Plan of Merger among Teradyne, Offeror and Nextest (incorporated in this Schedule TO by reference to the Schedule TO-C filed by Teradyne on December 12, 2007).
(a)(5)(B)*	Transcript of the Investor Call on December 12, 2007 regarding announcement of the Agreement and Plan of Merger among Teradyne, Offeror and Nextest (incorporated in this Schedule TO by reference to the Schedule TO-C filed by Teradyne on December 12, 2007).
(a)(5)(C)*	Form of Summary Advertisement Published in the Wall Street Journal on December 21, 2007.
(a)(5)(D)*	Press Release Issued by Teradyne, dated December 21, 2007, announcing the commencement of the Offer.
(a)(5)(E)	Joint Press Release Issued by Teradyne and Nextest, dated January 15, 2008, announcing early termination of the waiting period under the HSR Act.
(d)(1)*	Agreement and Plan of Merger, dated as of December 11, 2007, among Teradyne, Offeror and Nextest (incorporated in this Schedule TO by reference to the Current Report on Form 8-K filed by Teradyne on December 13, 2007).
(d)(2)*	Form of Stockholders’ Agreement, dated as of December 11, 2007, entered into between Teradyne and each of Robin Adler, Howard Marshall, Tim Moriarty, James Moniz, Richard Dissly, Juan Benitez, Stephen Newberry, Eugene White and Craig Foster (incorporated in this Schedule TO by reference to the Current Report on Form 8-K filed by Teradyne on December 13, 2007).

* Previously filed.

EX-99.A(5)(E)

Exhibit a(5)(E)

Teradyne and Nextest Systems Corp. Announce Early Termination of

Hart-Scott-Rodino Waiting Period

North Reading, MA – January 15, 2008 – Teradyne, Inc. (NYSE: TER) and Nextest Systems Corporation (NASDAQ: NEXT) jointly announced today that the Federal Trade Commission has granted early termination of the waiting period under the Hart-Scott-Rodino (HSR) Antitrust Improvements Act of 1976, as amended, with respect to Teradyne’s tender offer of the outstanding shares of Nextest Systems Corporation.

On December 21, 2007, NAC Equipment Corporation, a direct wholly owned subsidiary of Teradyne, commenced a tender offer to acquire all outstanding shares of common stock of Nextest, at a price of $20.00 per share, in cash, pursuant to a previously announced Agreement and Plan of Merger among, Teradyne, NAC, and Nextest, dated December 11, 2007. The tender offer and any withdrawal rights to which Nextest’s stockholders may be entitled will expire at midnight, New York City time, at the end of January 23, 2008, unless the offer is extended.

About Teradyne, Inc.

Teradyne (NYSE:TER) is a leading supplier of Automatic Test Equipment used to test complex electronics used in the consumer electronics, automotive, computing, telecommunications, and aerospace and defense industries. In 2006, Teradyne had sales of $1.36 billion from continuing operations, and currently employs about 3,600 people worldwide. For more information, visit www.teradyne.com. Teradyne (R) is a registered trademark of Teradyne, Inc. in the U.S. and other countries. All product names are trademarks of Teradyne, Inc. (including its subsidiaries).

About Nextest Systems Corp.

Nextest is a low-cost leader in the design and manufacture of Automatic Test Equipment (ATE) for flash memory and System-On-Chip semiconductors. Nextest’s products address the growing demand from manufacturers for ATE with increased throughput, functionality and reliability, while reducing time to market and cost of test. Nextest has shipped over 1,900 systems to more than 70 semiconductor companies worldwide. Further information is available at www.nextest.com.

Notice To Investors

This press release is for informational purposes only and is not an offer to purchase nor a solicitation of an offer to sell securities. The solicitation and the offer to purchase shares of Nextest common stock are being made only pursuant to the Offer to Purchase, Letter of Transmittal and related materials that Teradyne, Inc. and NAC Equipment Corporation have filed with the SEC on a Tender Offer Statement on Schedule TO. Nextest also has filed a Solicitation/Recommendation Statement on Schedule 14D-9. Nextest stockholders and other investors should read these materials carefully because they contain important information, including the terms and conditions of the offer. Additionally, stockholders and other investors are urged to read carefully those materials prior to making any decisions with respect to the offer. Nextest stockholders and other investors may obtain copies of these materials without charge from the SEC through the SEC’s website www.sec.gov, from Georgeson, Inc., the information agent for the offer, at (800) 733-6092 (banks and brokers at (212) 440-9800), from Goldman Sachs, the Dealer Manager for the tender offer, toll-free at (800) 323-5678 or collect at (212) 902-1000, or from Teradyne, Inc., Investor Relations, 600 Riverpark Drive, North Reading, Massachusetts 01864.

Safe Harbor Statement

The forward-looking statements included in this release are made only as of the date of publication. Except as otherwise required by law, Teradyne disclaims any intention or obligation to update any forward-looking statements as a result of development occurring after the date of this press release.

This release contains forward-looking statements regarding the proposed acquisition of Nextest, the expected timetable for completing the transaction, future business prospects and market conditions and benefits and synergies of the transaction. Such statements are based on the current assumptions and expectations of Teradyne’s management and are neither promises nor guarantees. You can generally identify these forward-looking statements based on the context of the statements and by the fact that they use words such as “will,” “anticipate,” “expect,” “project,” “intend,” “plan,” “believe,” “target” and other words and terms of similar meaning in connection with any discussion of future operating or financial performance. There can be no assurance that management’s estimates of our future results will be achieved. Important factors that could cause actual results to differ materially from those presently expected include: conditions affecting the markets in which Nextest operates; the uncertainty of regulatory approvals; the parties’ ability to satisfy the tender offer and merger agreement conditions and consummate the transaction; Teradyne’s ability to successfully integrate Nextest’s operations with its existing operations; the ability to realize anticipated synergies and cost savings; and other events, factors and risks previously and from time to time disclosed in filings with the SEC, including, but not limited to, Teradyne’s annual report on Form 10-K for the fiscal year ended December 31, 2006 and Nextest’s annual report on Form 10-K for the fiscal year ended June 30, 2007.

Contacts:

Teradyne, Inc.

Tom Newman, 978-370-2425

VP, Corporate Relations

or

Nextest Systems Corp.:

GEM Agency

Connie Berar, 408-529-4694