10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 29, 2024

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from ________ to ________

Commission File No. 001-06462

TERADYNE, INC.

(Exact name of registrant as specified in its charter)

Massachusetts	04-2272148
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)
600 Riverpark Drive, North Reading, Massachusetts	01864
(Address of Principal Executive Offices)	(Zip Code)

978-370-2700

(Registrant’s Telephone Number, Including Area Code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.125 per share	TER	Nasdaq Stock Market LLC

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to the filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files) Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, 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 (check one):

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Emerging growth company	☐
Smaller reporting company	☐

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. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

The number of shares outstanding of the registrant’s only class of Common Stock as of October 28, 2024, was 162,861,462 shares.

TERADYNE, INC.

INDEX

		Page No.
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited):	1
	Condensed Consolidated Balance Sheets as of September 29, 2024, and December 31, 2023	1
	f
	Condensed Consolidated Statements of Operations for the Three and Nine Months ended September 29, 2024, and October 1, 2023	2
	Condensed Consolidated Statements of Comprehensive Income for the Three and Nine Months ended September 29, 2024, and October 1, 2023	3
	Condensed Statements of Shareholders’ Equity for the Three and Nine Months Ended September 29, 2024, and October 1, 2023	4
	d
	Condensed Consolidated Statements of Cash Flows for the Nine Months Ended September 29, 2024, and October 1, 2023	5
	Notes to Condensed Consolidated Financial Statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	30
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	40
Item 4.	Controls and Procedures	40
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	41
Item 1A.	Risk Factors	41
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	42
Item 4.	Mine Safety Disclosures	42
Item 5.	Other Information	43
Item 6.	Exhibits	44

PART I

Item 1: Financial Statements

TERADYNE, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

	September 29, 2024			December 31, 2023
	(in thousands, except per share amount)
ASSETS
Current assets:
Cash and cash equivalents	$	510,036		$	757,571
Marketable securities		41,631			62,154
Accounts receivable, less allowance for credit losses of $1,972 and $1,988 at September 29, 2024    and December 31, 2023, respectively		484,376			422,124
Inventories, net		297,340			309,974
Prepayments		489,548			548,970
Other current assets		15,935			37,992
Current assets held for sale		—			23,250
Total current assets		1,838,866			2,162,035
Property, plant and equipment, net		491,704			445,492
Operating lease right-of-use assets, net		70,784			73,417
Marketable securities		125,944			117,434
Deferred tax assets		201,881			175,775
Retirement plans assets		13,114			11,504
Equity method investment		538,351			—
Other assets		48,384			38,580
Acquired intangible assets, net		21,288			35,404
Goodwill		419,412			415,652
Long-term assets held for sale		—			11,531
Total assets	$	3,769,728		$	3,486,824
LIABILITIES
Current liabilities:
Accounts payable	$	158,459		$	180,131
Accrued employees’ compensation and withholdings		159,794			191,750
Deferred revenue and customer advances		99,776			99,804
Other accrued liabilities		105,150			114,712
Operating lease liabilities		19,175			17,522
Income taxes payable		52,542			48,653
Current liabilities held for sale		—			7,379
Total current liabilities		594,896			659,951
Retirement plans liabilities		137,735			132,090
Long-term deferred revenue and customer advances		41,135			37,282
Long-term other accrued liabilities		8,373			19,998
Deferred tax liabilities		164			183
Long-term operating lease liabilities		60,287			65,092
Long-term incomes taxes payable		24,596			44,331
Long-term liabilities held for sale		—			2,000
Total liabilities		867,186			960,927
Commitments and contingencies (Note R)
SHAREHOLDERS’ EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized; 162,959 and 152,698 shares issued    and outstanding at September 29, 2024, and December 31, 2023, respectively		20,370			19,087
Additional paid-in capital		1,896,161			1,827,274
Accumulated other comprehensive loss		(4,028	)		(26,978	)
Retained earnings		990,039			706,514
Total shareholders’ equity		2,902,542			2,525,897
Total liabilities and shareholders’ equity	$	3,769,728		$	3,486,824

The accompanying notes, together with the Notes to Consolidated Financial Statements included in Teradyne’s Annual Report on Form 10-K for the year ended December 31, 2023, are an integral part of the condensed consolidated financial statements.

1

TERADYNE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
	(in thousands, except per share amount)						(in thousands, except per share amount)
Revenues:
Products	$	612,871		$	551,982		$	1,668,181		$	1,565,776
Services		124,427			151,750			398,815			439,923
Total revenues		737,298			703,732			2,066,996			2,005,699
Cost of revenues:
Cost of products		253,129			239,827			704,129			655,502
Cost of services		47,655			65,614			161,228			192,993
Total cost of revenues (exclusive of acquired intangible    assets amortization shown separately below)		300,784			305,441			865,357			848,495
Gross profit		436,514			398,291			1,201,639			1,157,204
Operating expenses:
Selling and administrative		157,649			138,330			461,307			434,979
Engineering and development		117,474			104,413			332,489			315,881
Acquired intangible assets amortization		4,748			4,720			14,108			14,348
Restructuring and other		4,578			6,856			11,018			15,251
Gain on sale of business		—			—			(57,486	)		—
Total operating expenses		284,449			254,319			761,436			780,459
Income from operations		152,065			143,972			440,203			376,745
Non-operating (income) expense:
Interest income		(5,076	)		(6,873	)		(19,658	)		(18,486	)
Interest expense		808			963			2,998			2,994
Other (income) expense, net		(2,651	)		5,602			5,574			6,470
Income before income taxes and equity in net earnings of affiliate		158,984			144,280			451,289			385,767
Income tax provision		12,260			16,164			54,095			54,069
Income before equity in net earnings of affiliate		146,724			128,116			397,194			331,698
Equity in net earnings of affiliate		(1,075	)		—			(1,075	)		—
Net income	$	145,649		$	128,116		$	396,119		$	331,698
Net income per common share:
Basic	$	0.89		$	0.83		$	2.51		$	2.14
Diluted	$	0.89		$	0.78		$	2.42		$	2.01
Weighted average common shares—basic		163,002			153,762			157,951			154,809
Weighted average common shares—diluted		164,253			164,050			163,357			165,037

The accompanying notes, together with the Notes to Consolidated Financial Statements included in Teradyne’s Annual Report on Form 10-K for the year ended December 31, 2023, are an integral part of the condensed consolidated financial statements.

2

TERADYNE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
	(in thousands)						(in thousands)
Net income	$	145,649		$	128,116		$	396,119		$	331,698
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax of $0, $0, $0, and $0, respectively		37,838			(14,325	)		22,751			(2,073	)
Available-for-sale marketable securities:
Unrealized (losses) gains on marketable securities arising during period, net of tax of $609, $(731), $205, and $(408), respectively		2,507			(2,628	)		885			(903	)
Less: Reclassification adjustment for (gains) losses included in net income, net of tax of $(2), $0, $24, and $9, respectively		(7	)		—			86			33
		2,500			(2,628	)		971			(870	)
Cash flow hedges:
Unrealized (losses) gains arising during period, net of tax of $(73), $728, $285, and $1,816, respectively		(260	)		2,590			1,014			6,456
Less: Reclassification adjustment for (gains) losses included in net income, net of tax of $0, $(869), $(500) and $(441) respectively		—			(3,091	)		(1,780	)		(1,567	)
		(260	)		(501	)		(766	)		4,889
Defined benefit post-retirement plan:
Amortization of prior service credit, net of tax of $0, $0, $(1), and $(1), respectively		(2	)		(2	)		(6	)		(6	)
Other comprehensive income (loss)		40,076			(17,456	)		22,950			1,940
Comprehensive income	$	185,725		$	110,660		$	419,069		$	333,638

The accompanying notes, together with the Notes to Consolidated Financial Statements included in Teradyne’s Annual Report on Form 10-K for the year ended December 31, 2023, are an integral part of the condensed consolidated financial statements.

3

TERADYNE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

(Unaudited)

	Shareholders' Equity
	Common Stock Shares			Common Stock Par Value			Additional Paid-in Capital			Accumulated Other Comprehensive Income (Loss)			Retained Earnings			Total Shareholders’ Equity
	(in thousands)
For the Three Months Ended September 29, 2024
Balance, June 30, 2024		161,802		$	20,225		$	1,865,351		$	(44,104	)	$	889,340		$	2,730,812
Net issuance of common stock under stock-based plans		130			17			14,966									14,983
Stock-based compensation expense								15,999									15,999
Warrant exercises		1,223			153			(155	)								(2	)
Repurchase of common stock		(196	)		(25	)								(25,376	)		(25,401	)
Cash dividends ($0.12 per share)														(19,574	)		(19,574	)
Net income														145,649			145,649
Other comprehensive income (loss)											40,076						40,076
Balance, September 29, 2024		162,959		$	20,370		$	1,896,161		$	(4,028	)	$	990,039		$	2,902,542
For the Three Months Ended October 1, 2023
Balance, July 2, 2023		154,148		$	19,269		$	1,784,590		$	(30,472	)	$	661,496		$	2,434,883
Net issuance of common stock under stock-based plans		207			26			17,180									17,206
Stock-based compensation expense								14,367									14,367
Repurchase of common stock		(1,120	)		(141	)								(118,766	)		(118,907	)
Cash dividends ($0.11 per share)														(16,909	)		(16,909	)
Settlements of convertible notes		210			25			(25	)								—
Exercise of convertible notes hedge call options		(210	)		(25	)		25									—
Net income														128,116			128,116
Other comprehensive income (loss)											(17,456	)					(17,456	)
Balance, October 1, 2023		153,235		$	19,154		$	1,816,137		$	(47,928	)	$	653,937		$	2,441,300

	Shareholders' Equity
	Common Stock Shares			Common Stock Par Value			Additional Paid-in Capital			Accumulated Other Comprehensive Income (Loss)			Retained Earnings			Total Shareholders’ Equity
	(in thousands)
For the Nine Months Ended September 29, 2024
Balance, December 31, 2023		152,698		$	19,087		$	1,827,274		$	(26,978	)	$	706,514		$	2,525,897
Net issuance of common stock under stock-based plans		720			91			23,340									23,431
Stock-based compensation expense								46,817									46,817
Warrant exercises		10,036			1,254			(1,270	)								(16	)
Repurchase of common stock		(495	)		(62	)								(55,630	)		(55,692	)
Cash dividends ($0.36 per share)														(56,964	)		(56,964	)
Net income														396,119			396,119
Other comprehensive income (loss)											22,950						22,950
Balance, September 29, 2024		162,959		$	20,370		$	1,896,161		$	(4,028	)	$	990,039		$	2,902,542
For the Nine Months Ended October 1, 2023
Balance, December 31, 2022		155,759		$	19,470		$	1,755,963		$	(49,868	)	$	725,729		$	2,451,294
Net issuance of common stock under stock-based plans		838			104			13,399									13,503
Stock-based compensation expense								46,775									46,775
Repurchase of common stock		(3,362	)		(420	)								(352,371	)		(352,791	)
Cash dividends ($0.33 per share)														(51,119	)		(51,119	)
Settlements of convertible notes		585			72			(72	)								—
Exercise of convertible notes hedge call options		(585	)		(72	)		72									—
Net income														331,698			331,698
Other comprehensive income (loss)											1,940						1,940
Balance, October 1, 2023		153,235		$	19,154		$	1,816,137		$	(47,928	)	$	653,937		$	2,441,300

The accompanying notes, together with the Notes to Consolidated Financial Statements included in Teradyne’s Annual Report on Form 10-K for the year ended December 31, 2023, are an integral part of the condensed consolidated financial statements.

4

TERADYNE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the Nine Months  Ended
	September 29, 2024			October 1, 2023
	(in thousands)
Cash flows from operating activities:
Net income	$	396,119		$	331,698
Adjustments to reconcile net income from operations to net cash provided by operating activities:
Depreciation		74,480			68,858
Stock-based compensation		45,267			45,236
Provision for excess and obsolete inventory		15,516			23,069
Amortization		14,133			14,083
Losses (gains) on investments		10,139			(3,159	)
Equity in net earnings of affiliate		1,075			—
Gain on sale of business		(57,486	)		—
Deferred taxes		(26,261	)		(24,026	)
Retirement plan actuarial losses (gains)		(2,512	)		—
Other		(5,041	)		(13	)
Changes in operating assets and liabilities
Accounts receivable		(65,266	)		30,191
Inventories		11,127			6,395
Prepayments and other assets		61,438			(63,982	)
Accounts payable and other liabilities		(63,666	)		3,999
Deferred revenue and customer advances		3,624			(49,517	)
Retirement plans contributions		(4,169	)		(3,698	)
Income taxes		(18,898	)		(42,683	)
Net cash provided by operating activities		389,619			336,451
Cash flows from investing activities:
Purchases of property, plant and equipment		(140,710	)		(115,306	)
Purchase of investment in a business		(527,060	)		—
Purchases of marketable securities		(35,097	)		(137,786	)
Issuance of convertible loan		—			(5,000	)
Proceeds from the sale of a business, net of cash and cash equivalents sold		90,348			—
Proceeds from maturities of marketable securities		33,163			71,447
Proceeds from sales of marketable securities		23,600			36,963
Proceeds from insurance		873			460
Net cash used for investing activities		(554,883	)		(149,222	)
Cash flows from financing activities:
Repayments of borrowings on revolving credit facility		(185,000	)		—
Dividend payments		(56,936	)		(51,081	)
Repurchase of common stock		(55,053	)		(346,492	)
Payments related to net settlement of employee stock compensation awards		(13,833	)		(20,586	)
Payments of convertible debt principal		—			(26,735	)
Proceeds from borrowings on revolving credit facility		185,000			—
Issuance of common stock under stock purchase and stock option plans		37,265			34,084
Net cash used for financing activities		(88,557	)		(410,810	)
Effects of exchange rate changes on cash and cash equivalents		6,286			5,769
Decrease in cash and cash equivalents		(247,535	)		(217,812	)
Cash and cash equivalents at beginning of period		757,571			854,773
Cash and cash equivalents at end of period	$	510,036		$	636,961
Non-cash investing activities:
Capital expenditures incurred but not yet paid:	$	3,679		$	2,392

The accompanying notes, together with the Notes to Consolidated Financial Statements included in Teradyne’s Annual Report on Form 10-K for the year ended December 31, 2023, are an integral part of the condensed consolidated financial statements.

5

TERADYNE, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

A. THE COMPANY

Teradyne, Inc. (“Teradyne”) is a leading global supplier of automated test equipment and robotics solutions. Teradyne designs, develops, manufactures, and sells automated test systems and robotics products. Teradyne’s automated test systems are used to test semiconductors, wireless products, data storage and complex electronics systems in many industries including consumer electronics, wireless, automotive, industrial, computing, communications, and aerospace and defense industries. Teradyne’s robotics products include collaborative robotic arms, autonomous mobile robots, and advanced robotic control software used by global manufacturing, logistics and industrial customers to improve quality, increase manufacturing and material handling efficiency, and decrease manufacturing and logistics costs. Teradyne’s automated test equipment and robotics products and services include:

•semiconductor test (“Semiconductor Test”) systems;

•storage and system level test (“Integrated System Test” formerly "Storage Test") systems, defense/aerospace (“Defense/Aerospace”) test instrumentation and systems, and circuit-board test and inspection (“Production Board Test”) systems (collectively these products represent “System Test”);

•wireless test (“Wireless Test”) systems; and

•robotics (“Robotics”) products.

B. ACCOUNTING POLICIES

Basis of Presentation

The consolidated interim financial statements include the accounts of Teradyne and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated. These interim financial statements are unaudited and reflect all normal recurring adjustments that are, in the opinion of management, necessary for the fair statement of such interim financial statements. The December 31, 2023, condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by United States of America generally accepted accounting principles (“U.S. GAAP”) for complete financial statements. The accompanying financial information should be read in conjunction with the consolidated financial statements and notes thereto contained in Teradyne’s Annual Report on Form 10-K, filed with the U.S. Securities and Exchange Commission (“SEC”) on February 22, 2024, for the year ended December 31, 2023.

Preparation of Financial Statements and Use of Estimates

The preparation of consolidated financial statements requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent liabilities. On an on-going basis, management evaluates its estimates, including those related to inventories, investments, goodwill, intangible and other long-lived assets, accounts receivable, income taxes, deferred tax assets and liabilities, pensions, warranties, contingent consideration liabilities, and loss contingencies. Management bases its estimates on historical experience and on appropriate and customary assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Management is not aware of any specific event or circumstance that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities as of the date of issuance of this Quarterly Report on Form 10-Q. These estimates may change, as new events occur, and additional information is obtained. Actual results may differ significantly from these estimates under different assumptions or conditions.

Equity Method Investments

Teradyne accounts for investments using the equity method of accounting when it has significant influence over the financial and operating policies, but not control, of the investee. The equity method investments are initially recorded at cost and included in ‘Equity method investment’ in the consolidated balance sheet. Teradyne records its share of investee's net income or loss and other comprehensive income, and the amortization of equity method basis difference, calculated as the difference between the investment and the amount of underlying equity in net assets acquired, on a 3-month lag, which is applied consistently from period to period. Teradyne's share of investee's net income and the amortization of equity method basis difference are reported in ‘Equity in net earnings of affiliate’ in the consolidated statement of operations. Teradyne includes its share of investee's other comprehensive income

6

and a cumulative translation adjustment in the consolidated statements of comprehensive income. Teradyne monitors on an ongoing basis its equity method investments for indicators of other-than-temporary declines in fair value below carrying value.

C. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS

In November 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") No. 2023-07, "Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures", which will require Teradyne to disclose significant segment expenses and other segment items used by the Chief Operating Decision Maker ("CODM") on an annual and interim basis as well as provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually. Additionally, Teradyne will be required to disclose the title and position of the CODM. The new standard is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. This ASU will have no impact on results of operations, cash flows or financial condition. Upon adoption, Teradyne will apply the amendments in this ASU retrospectively to all prior period disclosures presented in the financial statements.

In December 2023, FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures”, which requires expanded disclosures relating to the tax rate reconciliation, income taxes paid, income (loss) before income tax expense (benefit) and income tax expense (benefit), requiring a greater disaggregation of information for each. The provisions of ASU 2023-09 are effective for fiscal years beginning after December 15, 2024. The amendments in this update should be applied on a prospective basis, but retrospective application is permitted. This ASU will have no impact on results of operations, cash flows or financial condition.

D. REVENUE

Disaggregation of Revenue

The following table provides information about disaggregated revenue by timing of revenue recognition, primary geographical market, and major product lines.

7

		Semiconductor Test				System Test		Robotics				Wireless Test
		System on-a-Chip		Memory				Universal Robots		Mobile Industrial Robots				Total
	(in thousands)
For the Three Months Ended September 29, 2024 (1)
Timing of Revenue Recognition
Point in Time		$	323,507	$	143,581	$	55,611	$	71,607	$	15,065	$	29,465	$	638,836
Over Time			68,848		6,798		17,701		1,811		168		3,136		98,462
Total		$	392,355	$	150,379	$	73,312	$	73,418	$	15,233	$	32,601	$	737,298
Geographical Market
Asia Pacific		$	364,476	$	137,890	$	29,277	$	10,873	$	2,960	$	24,342	$	569,818
Americas			17,150		1,325		39,919		32,315		8,460		5,515		104,684
Europe, Middle East and Africa			10,729		11,164		4,116		30,230		3,813		2,744		62,796
Total		$	392,355	$	150,379	$	73,312	$	73,418	$	15,233	$	32,601	$	737,298
For the Three Months Ended October 1, 2023 (1)
Timing of Revenue Recognition
Point in Time		$	330,846	$	86,247	$	66,418	$	68,938	$	14,012	$	32,638	$	599,099
Over Time			73,264		7,506		16,785		1,607		1,135		4,336		104,633
Total		$	404,110	$	93,753	$	83,203	$	70,545	$	15,147	$	36,974	$	703,732
Geographical Market
Asia Pacific		$	360,375	$	91,352	$	40,464	$	15,430	$	3,180	$	24,727	$	535,528
Americas			24,752		1,356		35,888		26,073		7,154		10,139		105,362
Europe, Middle East and Africa			18,983		1,045		6,851		29,042		4,813		2,108		62,842
Total		$	404,110	$	93,753	$	83,203	$	70,545	$	15,147	$	36,974	$	703,732
For the Nine Months Ended September 29, 2024 (2)
Timing of Revenue Recognition
Point in Time		$	896,635	$	367,679	$	157,203	$	210,222	$	49,850	$	82,652	$	1,764,241
Over Time			211,612		21,626		52,232		5,542		938		10,805		302,755
Total		$	1,108,247	$	389,305	$	209,435	$	215,764	$	50,788	$	93,457	$	2,066,996
Geographical Market
Asia Pacific		$	1,016,674	$	357,993	$	76,317	$	37,254	$	11,361	$	70,776	$	1,570,375
Americas			59,912		13,631		105,197		82,220		28,195		16,240		305,395
Europe, Middle East and Africa			31,661		17,681		27,921		96,290		11,232		6,441		191,226
Total		$	1,108,247	$	389,305	$	209,435	$	215,764	$	50,788	$	93,457	$	2,066,996
For the Nine Months Ended October 1, 2023 (2)
Timing of Revenue Recognition
Point in Time		$	886,201	$	260,052	$	200,076	$	194,698	$	42,748	$	108,262	$	1,692,038
Over Time			219,436		21,890		52,030		5,731		3,364		11,210		313,661
Total		$	1,105,638	$	281,942	$	252,106	$	200,429	$	46,112	$	119,472	$	2,005,699
Geographical Market
Asia Pacific		$	946,696	$	270,297	$	121,698	$	43,530	$	6,973	$	70,320	$	1,459,514
Americas			98,511		8,586		105,031		69,346		25,051		42,476		349,001
Europe, Middle East and Africa			60,431		3,059		25,377		87,553		14,088		6,676		197,184
Total		$	1,105,638	$	281,942	$	252,106	$	200,429	$	46,112	$	119,472	$	2,005,699

(1)Includes $0.8 million and $1.4 million in 2024, and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

(2)Includes $2.5 million and $3.9 million in 2024 and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

Contract Balances

During the three and nine months ended September 29, 2024, Teradyne recognized $13.4 million and $60.2 million, respectively, that was included within the deferred revenue and customer advances balances at the beginning of the period. During the three and nine months ended October 1, 2023, Teradyne recognized $21.9 million and $91.3 million, respectively, that was included within the deferred revenue and customer advances balances at the beginning of the period. This revenue primarily relates to undelivered hardware, extended warranties, training, application support, and post contract support. Each of these represents a distinct performance obligation. As of September 29, 2024, Teradyne had $1,045.4 million of unsatisfied performance obligations. Teradyne expects to recognize approximately 93% of the remaining performance obligations in the next 12 months and the remainder in 1-3 years.

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Deferred revenue and customer advances consist of the following and are included in short and long-term deferred revenue and customer advances on the balance sheet:

	September 29, 2024		December 31, 2023
	(in thousands)
Maintenance, service and training	$	57,866	$	66,458
Customer advances, undelivered elements and other		44,116		35,731
Extended warranty		38,929		34,897
Total deferred revenue and customer advances	$	140,911	$	137,086

Accounts Receivable

During the three and nine months ended September 29, 2024, and October 1, 2023, Teradyne sold certain trade accounts receivables on a non-recourse basis to third-party financial institutions pursuant to factoring agreements. During the three months ended September 29, 2024, and October 1, 2023, total trade accounts receivable sold under the factoring agreements were $36.1 million and $94.1 million, respectively. During the nine months ended September 29, 2024, and October 1, 2023, total trade accounts receivable sold under the factoring agreements were $116.8 million and $191.2 million, respectively. Factoring fees for the sales of receivables were recorded in interest expense and were not material. Teradyne accounted for these transactions as sales of receivables and presented cash proceeds as cash provided by operating activities in the consolidated statements of cash flows.

E. DISPOSITIONS

On May 27, 2024, Teradyne completed the sale of the Device Interface Solutions ("DIS") business, a component of the Semiconductor Test segment, to Technoprobe S.p.A. ("Technoprobe") for $85.0 million in cash, net of cash and cash equivalents sold, and a customary working capital adjustment. The sale resulted in a pre-tax gain of $57.5 million recorded as 'Gain on sale of business' in the consolidated statement of operations. The transaction did not meet the criteria to be classified as a discontinued operation, as it did not represent a strategic shift that will have a major effect on operations and financial results.

Assets and liabilities related to the DIS sale agreement met the criteria and were classified as held for sale in Teradyne’s consolidated balance sheet as of December 31, 2023, as follows:

	December 31, 2023
Current assets:
Inventories, net	$	17,952
Prepayments		5,298
Total current assets held for sale		23,250
Property, plant and equipment, net		8,986
Operating lease right-of-use assets, net		2,545
Total assets held for sale	$	34,781
Current liabilities:
Accounts payable	$	6,356
Other accrued liabilities		552
Operating lease liabilities		471
Total current liabilities held for sale		7,379
Long-term operating lease liabilities		2,000
Total liabilities held for sale	$	9,379
Net assets held for sale	$	25,402

F. EQUITY METHOD INVESTMENT

On May 27, 2024, Teradyne paid $524.1 million to purchase a combination of previously issued and outstanding shares and shares newly issued by Technoprobe, S.p.A. ("Technoprobe"). The shares purchased represent 10% of the issued and outstanding shares of Technoprobe. Teradyne also received a board seat as part of the purchase. Teradyne accounts for this investment using the

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equity method as a result of being able to exercise significant influence over the operating and financial decisions of Technoprobe. As of September 29, 2024, $538.4 million was recorded as 'Equity method investment' in the consolidated balance sheets.

	(in thousands)
Balance at June 30, 2024	$	524,060
Other comprehensive income related to investment		15,366
Equity in net earnings of affiliate		(1,075	)
Balance at September 29, 2024	$	538,351

Based on the quoted closing price of Technoprobe stock as of September 29, 2024, the fair value of the publicly traded investment was $471.8 million, and there was no other-than-temporary impairment identified.

Teradyne's equity method basis difference was calculated as the difference between the investment and the amount of underlying equity in net assets acquired. The equity method basis difference calculated at acquisition attributable to developed technology, customer relationships, trade name, property, plant and equipment, inventory, and deferred tax liability was $204.7 million. The basis differences, net of tax, will be amortized over their estimated useful lives.

Teradyne made an accounting policy election to report its share of Technoprobe's results on a 3-month lag, which is applied consistently from period to period. Teradyne records its share of Technoprobe's net income or loss and the amortization of equity method basis difference, as 'Equity in net earnings of affiliate' in the consolidated statements of operations. Teradyne includes its share of Technoprobe's other comprehensive income and a cumulative translation adjustment in the consolidated statements of comprehensive income.

G. INVENTORIES

Inventories, net consisted of the following at September 29, 2024, and December 31, 2023:

	September 29, 2024		December 31, 2023
	(in thousands)
Raw material	$	216,019	$	258,422
Work-in-process		48,249		26,851
Finished goods		33,072		24,701
Total inventories, net (1)	$	297,340	$	309,974

(1)Inventories, net at December 31, 2023, exclude $18.0 million of primarily work-in-process inventories, net classified as assets held for sale. See Note E: "Dispositions" for additional information.

Inventory reserves at September 29, 2024, and December 31, 2023, were $140.5 million and $136.0 million, respectively.

H. FINANCIAL INSTRUMENTS

Cash Equivalents

Teradyne considers all highly liquid investments with original maturities of 90 days or less at the date of acquisition to be cash equivalents.

Marketable Securities

Teradyne’s equity and debt mutual funds are classified as Level 1 and available-for-sale debt securities are classified as Level 2. The vast majority of Level 2 securities are fixed income securities priced by third party pricing vendors. These pricing vendors utilize the most recent observable market information in pricing these securities or, if specific prices are not available, use other observable inputs like market transactions involving identical or comparable securities.

During the three and nine months ended September 29, 2024, and October 1, 2023, there were no transfers in or out of Level 1, Level 2, or Level 3 financial instruments.

Realized gains recorded in the three and nine months ended September 29, 2024, were $0.8 million and $2.1 million, respectively. Realized gains recorded in the three and nine months ended October 1, 2023, were $0.1 million and $0.6 million,

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respectively. Realized losses recorded in the three and nine months ended September 29, 2024, were $0.0 million and $0.3 million, respectively. Realized losses recorded in the three and nine months ended October 1, 2023, were $0.0 million and $0.3 million, respectively. Realized gains and losses are included in 'Other (income) expense, net' in the consolidated statement of operations.

Unrealized gains on equity securities recorded in the three and nine months ended September 29, 2024, were $2.2 million and $5.4 million, respectively. Unrealized gains on equity securities recorded in the three and nine months ended October 1, 2023, were $0.0 million and $4.6 million, respectively. There were no unrealized losses on equity securities recorded in the three and nine months ended September 29, 2024. Unrealized losses on equity securities recorded in the three and nine months ended October 1, 2023, were $1.7 million. Unrealized gains and losses on equity securities are included in 'Other (income) expense, net' in the consolidated statement of operations.

Unrealized gains and losses on available-for-sale debt securities are included in 'Accumulated other comprehensive income (loss)' in the consolidated balance sheet.

The cost of securities sold is based on average cost.

The following tables set forth by fair value hierarchy Teradyne’s financial assets and liabilities that were measured at fair value on a recurring basis as of September 29, 2024, and December 31, 2023.

	September 29, 2024
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in thousands)
Assets
Cash	$	198,946	$	—	$	—	$	198,946
Cash equivalents		308,000		3,090		—		311,090
Available-for-sale securities:
U.S. Treasury securities		—		41,833		—		41,833
Corporate debt securities		—		37,149		—		37,149
Certificates of deposit and time deposits		—		21,741		—		21,741
Debt mutual funds		8,640		—		—		8,640
U.S. government agency securities		—		3,931		—		3,931
Non-U.S. government securities		—		801		—		801
Equity securities:
Mutual funds		53,480		—		—		53,480
	$	569,066	$	108,545	$	—	$	677,611
Derivative assets		—		332		—		332
Total	$	569,066	$	108,877	$	—	$	677,943
Liabilities
Derivative liabilities		—		1,435		—	$	1,435
Total	$	—	$	1,435	$	—	$	1,435
Reported as follows:
	(Level 1)		(Level 2)		(Level 3)		Total
	(in thousands)
Assets
Cash and cash equivalents	$	506,946	$	3,090	$	—	$	510,036
Marketable securities		—		41,631		—		41,631
Long-term marketable securities		62,120		63,824		—		125,944
Other current assets		—		332		—		332
Total	$	569,066	$	108,877	$	—	$	677,943
Liabilities
Other current liabilities		—		1,435		—		1,435
Total	$	—	$	1,435	$	—	$	1,435

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	December 31, 2023
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in thousands)
Assets
Cash	$	298,156	$	—	$	—	$	298,156
Cash equivalents		453,298		6,117		—		459,415
Available-for-sale securities:
Corporate debt securities		—		52,734		—		52,734
U.S. Treasury securities		—		41,808		—		41,808
Certificates of deposit and time deposits		—		21,772		—		21,772
Debt mutual funds		8,773		—		—		8,773
U.S. government agency securities		—		4,892		—		4,892
Commercial paper		—		1,667		—		1,667
Non-U.S. government securities		—		810		—		810
Equity securities:
Mutual Funds		47,132		—		—		47,132
	$	807,359	$	129,800	$	—	$	937,159
Derivative assets		—		18,746		—		18,746
Total	$	807,359	$	148,546	$	—	$	955,905
Liabilities
Derivative liabilities		—		2,545		—		2,545
Total	$	—	$	2,545	$	—	$	2,545
Reported as follows:
	(Level 1)		(Level 2)		(Level 3)		Total
	(in thousands)
Assets
Cash and cash equivalents	$	751,454	$	6,117	$	—	$	757,571
Marketable securities		—		62,154		—		62,154
Long-term marketable securities		55,905		61,529		—		117,434
Other current assets		—		18,746		—		18,746
Total	$	807,359	$	148,546	$	—	$	955,905
Liabilities
Other current liabilities	$	—	$	2,545	$	—	$	2,545
Total	$	—	$	2,545	$	—	$	2,545

The carrying amounts and fair values of Teradyne’s financial instruments at September 29, 2024, and December 31, 2023, were as follows:

	September 29, 2024				December 31, 2023
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Assets
Cash and cash equivalents	$	510,036	$	510,036	$	757,571	$	757,571
Marketable securities		167,575		167,575		179,588		179,588
Derivative assets		332		332		18,746		18,746
Liabilities
Derivative liabilities		1,435		1,435		2,545		2,545

The fair values of accounts receivable, net and accounts payable approximate the carrying value due to the short-term nature of these instruments.

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The following table summarizes the composition of available-for-sale marketable securities at September 29, 2024:

	September 29, 2024
	Available-for-Sale
	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
U.S. Treasury securities	$	45,522	$	106	$	(3,795	)	$	41,833	$	22,985
Corporate debt securities	$	39,986	$	323	$	(3,160	)	$	37,149	$	25,248
Certificates of deposit and time deposits		21,741		—		—			21,741		—
Debt mutual funds		8,846		—		(206	)		8,640		3,319
U.S. government agency securities		3,921		11		(1	)		3,931		876
Non-U.S. government securities		801		—		—			801		—
	$	120,817	$	440	$	(7,162	)	$	114,095	$	52,428

Reported as follows:

	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Marketable securities	$	41,673		20	$	(62	)	$	41,631	$	9,973
Long-term marketable securities		79,144		420		(7,100	)		72,464		42,455
	$	120,817	$	440	$	(7,162	)	$	114,095	$	52,428

The following table summarizes the composition of available-for-sale marketable securities at December 31, 2023:

	December 31, 2023
	Available-for-Sale
	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Corporate debt securities	$	56,458	$	201	$	(3,925	)	$	52,734	$	44,263
U.S. Treasury securities		45,725		14		(3,931	)		41,808		35,080
Certificates of deposit and time deposits		21,772		—		—			21,772		—
Debt mutual funds		9,081		—		(308	)		8,773		3,303
U.S. government agency securities		4,898		—		(6	)		4,892		4,892
Commercial paper		1,633		34		—			1,667		—
Non-U.S. government securities		810		—		—			810		—
	$	140,377	$	249	$	(8,170	)	$	132,456	$	87,538

Reported as follows:

	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Marketable securities	$	62,385	$	36	$	(267	)		62,154	$	34,844
Long-term marketable securities		77,992		213		(7,903	)		70,302		52,694
	$	140,377	$	249	$	(8,170	)	$	132,456	$	87,538

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As of September 29, 2024, the fair market value of investments with unrealized losses less than one year and greater than one year totaled $8.3 million and $44.1 million, respectively. As of December 31, 2023, the fair market value of investments with unrealized losses for less than one year and greater than one year totaled $22.3 million and $65.2 million, respectively.

Teradyne reviews its investments to identify and evaluate investments that have an indication of possible impairment. Based on this review, Teradyne determined that the unrealized losses related to these investments at September 29, 2024, and December 31, 2023, were not other than temporary.

The contractual maturities of investments in available-for-sale securities held at September 29, 2024, were as follows:

	September 29, 2024
	Cost		Fair Market Value
	(in thousands)
Due within one year	$	41,673	$	41,631
Due after 1 year through 5 years		25,690		25,729
Due after 5 years through 10 years		7,950		7,908
Due after 10 years		36,658		30,187
Total	$	111,971	$	105,455

Contractual maturities of investments in available-for-sale securities held at September 29, 2024, exclude debt mutual funds with a fair market value of $8.6 million as they do not have a contractual maturity date.

Derivatives

Teradyne conducts business in various foreign countries, with certain transactions denominated in local currencies. As a result, Teradyne is exposed to risks relating to changes in foreign currency exchange rates. Teradyne’s foreign currency risk management objective is to minimize the effect of exchange rate fluctuations associated with the remeasurement of monetary assets and liabilities denominated in foreign currencies, and changes in its cash inflows attributable to the forecasted cash flows from certain foreign currency denominated revenues.

To minimize the effect of exchange rate fluctuations associated with the remeasurement of monetary assets and liabilities denominated in foreign currencies, Teradyne enters into foreign currency forward contracts. The change in fair value of these derivatives is recorded directly in earnings and is used to offset the change in value of monetary assets and liabilities denominated in foreign currencies.

Teradyne also enters into foreign currency forward and option contracts designated as cash flow hedges to hedge the risk of changes in its cash inflows attributable to changes in foreign currency exchange rates. The cash flow hedges have maturities of less than six months and mature in the period of revenue recognition for certain products and services in backlog and forecasted to be recognized in a future period. Teradyne evaluates cash flow hedges for effectiveness at inception based on the critical terms match method. The hedges are not expected to incur any ineffectiveness however a quarterly qualitative assessment of effectiveness is done to determine if the critical terms match method remains appropriate to use. The change in fair value of the contracts is recorded in accumulated other comprehensive income (loss) and reclassified to earnings at maturity date.

Teradyne does not use derivative financial instruments for speculative purposes.

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At September 29, 2024, and December 31, 2023, Teradyne had the following contracts to buy and sell non-U.S. currencies for U.S. dollars and other non-U.S. currencies with the following notional amounts:

	Net Notional Value
	September 29, 2024		December 31, 2023
	(in millions)
Currency Hedged (Buy/Sell)
U.S. dollar/Taiwan dollar		29.6		42.7
U.S. dollar/Japanese yen		21.7		11.0
U.S. dollar/Korean won		8.9		7.2
U.S. dollar/British pound sterling		1.0		1.5
U.S. dollar/Danish krone		—		36.0
Danish krone/U.S. dollar		25.7		0.7
Euro/U.S. dollar		24.8		25.3
Singapore dollar/U.S. dollar		23.0		16.6
Philippine peso/U.S. dollar		9.7		10.1
Chinese yuan/U.S. dollar		1.7		1.0
Total	$	146.1	$	152.1

The fair value of the outstanding contracts was a net loss of $0.8 million and a net loss of $1.8 million at September 29, 2024, and December 31, 2023, respectively.

Unrealized gains and losses on foreign currency forward contracts and foreign currency remeasurement gains and losses on monetary assets and liabilities are included in 'Other (income) expense, net' in the consolidated statement of operations.

At September 29, 2024, and December 31, 2023, Teradyne had the following cash flow hedge contracts to buy and sell non-U.S. currencies for U.S. dollars with the following notional amounts:

	Net Notional Value
	September 29, 2024		December 31, 2023
	(in millions)
Currency Hedged (Buy/Sell)
U.S. dollar/Japanese yen	$	12.1	$	35.5
Total	$	12.1	$	35.5

The fair value of the outstanding cash flow hedge contracts was a loss of $0.3 million and a gain of $0.6 million at September 29, 2024, and December 31, 2023, respectively.

Unrealized gains and losses on foreign currency cash flow hedge contracts are included in accumulated other comprehensive income (loss). At maturity, the gains or losses associated with cash flow hedge contracts are recorded to revenue.

On November 7, 2023, in connection with Teradyne's agreement to acquire 10% investment in Technoprobe S.p.A, Teradyne purchased a call option to buy 481.0 million Euros. The expiration date of the option was April 26, 2024. On April 12, 2024, Teradyne entered into a forward to buy 481.0 million Euros which expired on May 23, 2024. At December 31, 2023, the fair value of the outstanding contract was $17.4 million. For the nine months ended September 29, 2024, a realized loss of $9.8 million was recorded in 'Other (income) expense, net' in the consolidated statement of operations.

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The following table summarizes the fair value of derivative instruments as of September 29, 2024, and December 31, 2023:

	Balance Sheet Location	September 29, 2024			December 31, 2023
		(in thousands)
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts	Other current assets		332			733
Foreign exchange forward contracts	Other current liabilities		(1,102	)		(2,545	)
Foreign exchange option contracts	Other current assets		—			17,364
Derivatives designated as hedging instruments:
Foreign exchange forward contracts	Other current assets		—			648
Foreign exchange forward contracts	Other current liabilities		(333	)		—
Total derivatives		$	(1,103	)	$	16,200

The following table summarizes the effect of derivative instruments recognized in the statement of operations for the three and nine months ended September 29, 2024, and October 1, 2023:

		For the Three Months  Ended					For the Nine Months  Ended
	Location of (Gains) Losses Recognized in Statement of Operations	September 29, 2024		October 1, 2023			September 29, 2024			October 1, 2023
		(in thousands)					(in thousands)
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts (1)	Other (income) expense, net	$	4,829	$	(1,886	)	$	686		$	(4,667	)
Foreign exchange option contracts	Other (income) expense, net		—		—			9,764			—
Derivatives designated as hedging instruments:
Foreign exchange forward and option contracts	Revenue		—		(3,960	)		(2,280	)		(2,008	)
Total Derivatives		$	4,829	$	(5,846	)	$	8,170		$	(6,675	)

(1)The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies. For the three and nine months ended September 29, 2024, net losses (gains) from remeasurement of monetary assets and liabilities denominated in foreign currencies were $(2.9) million and $3.1 million, respectively. For the three and nine months ended October 1, 2023, net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $5.3 million and $12.3 million, respectively.

See Note I: “Debt” regarding derivatives related to the convertible senior notes.

I. DEBT

Convertible Senior Notes

On December 12, 2016, Teradyne completed a private offering of $460.0 million aggregate principal amount of 1.25% convertible senior unsecured notes (the “Notes”) and received net proceeds, after issuance costs, of approximately $450.8 million, $33.0 million of which was used to pay the net cost of the convertible note hedge transactions and $50.1 million of which was used to repurchase 2.0 million shares of Teradyne’s common stock under its existing stock repurchase program from purchasers of the Notes in privately negotiated transactions effected through one of the initial purchasers or its affiliates conducted concurrently with the pricing of the Note offering. The Notes bore interest at a rate of 1.25% per year, payable semiannually in arrears on June 15 and December 15 of each year. The Notes matured on December 15, 2023.

Concurrent with the offering of the Notes, Teradyne entered into convertible note hedge transactions (the “Note Hedge Transactions”) with the initial purchasers or their affiliates (the “Option Counterparties”). The Note Hedge Transactions cover, subject to customary anti-dilution adjustments, the number of shares of the common stock that underlie the Notes. Separately and concurrent with the pricing of the Notes, Teradyne entered into warrant transactions with the Option Counterparties (the “Warrant Transactions”) in which it sold net-share-settled (or, at its election subject to certain conditions, cash-settled) warrants to the Option Counterparties. These transactions have been accounted for as an adjustment to Teradyne's shareholders’ equity. The Warrant Transactions, which began expiring March 18, 2024, and continued to expire through July 10, 2024, covered, subject to customary anti-dilution adjustments, approximately 1.3 million shares of common stock. During the three and nine months ended September 29, 2024, 1.3 million and 14.7 million warrants expired, resulting in the issuance of 1.2 million and 10.0 million shares of Teradyne common stock, respectively. As of the final date of expiration, July 10, 2024, the strike price of the warrants was approximately $39.35 per shares.

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The Warrant Transactions resulted in additional shares of Teradyne’s common stock being issued to the extent that the market price per share of Teradyne’s common stock, as measured under the terms of the Warrant Transactions, exceeds the applicable strike price of the warrants.

The interest expense on Teradyne's senior notes for three and nine months ended October 1, 2023, was as follows:

	For the Three Months  Ended				For the Nine Months  Ended
	September 29, 2024		October 1, 2023		September 29, 2024		October 1, 2023
	(in thousands)				(in thousands)
Contractual interest expense on the coupon	$	—	$	74	$	—	$	312
Amortization of debt issuance fees recognized as interest expense		—		—		—		113
Total interest expense on the convertible debt	$	—	$	74	$	—	$	425

Revolving Credit Facility

On May 1, 2020, Teradyne entered into a credit agreement (the “Credit Agreement”) with Truist Bank, as administrative agent and collateral agent, and the lenders party thereto. The Credit Agreement provided for a three-year, senior secured revolving credit facility of $400.0 million (the “Credit Facility”).

On December 10, 2021, the Credit Agreement was amended to extend the maturity date of the Credit Facility to December 10, 2026. On October 5, 2022, the Credit Agreement was amended to increase the amount of the Credit Facility to $750.0 million from $400.0 million. On November 7, 2023, the Credit Agreement was amended to allow for the purchase of the shares of Technoprobe.

The Credit Agreement provides that, subject to customary conditions, Teradyne may seek to obtain from existing or new lenders the available incremental amount under the Credit Facility, not to exceed the greater of $200.0 million or 15% of consolidated EBIDTA. The interest rate applicable to loans under the Credit Facility are, at Teradyne’s option, equal to either a base rate plus a margin ranging from 0.00% to 0.75% per annum or SOFR plus a margin ranging from 1.10% to 1.85% per annum, based on the consolidated leverage ratio of Teradyne. In addition, Teradyne will pay a commitment fee on the unused portion of the commitments under the Credit Facility ranging from 0.15% to 0.25% per annum, based on the then applicable consolidated leverage ratio.

Teradyne is not required to repay any loans under the Credit Facility prior to maturity, subject to certain customary exceptions. Teradyne is permitted to prepay all or any portion of the loans under the Credit Facility prior to maturity without premium or penalty, other than customary SOFR breakage costs.

The Credit Agreement contains customary events of default, representations, warranties, and affirmative and negative covenants that, among other things, limit Teradyne’s ability to sell assets, grant liens on assets, incur other secured indebtedness and make certain investments and restricted payments, all subject to exceptions set forth in the Credit Agreement. The Credit Agreement also requires Teradyne to satisfy two financial ratios measured at the end of each fiscal quarter: a consolidated leverage ratio and an interest coverage ratio.

The Credit Facility is guaranteed by certain of Teradyne’s domestic subsidiaries and collateralized by assets of Teradyne and such subsidiaries, including a pledge of 65% of the capital stock of certain foreign subsidiaries.

On May 16, 2024, Teradyne borrowed $185.0 million under the Credit Agreement to support the acquisition of 10% of the issued and outstanding shares of Technoprobe. Teradyne fully repaid its borrowings on the revolving credit facility prior to September 29, 2024. There was no outstanding revolver balance as of September 29, 2024.

As of November 1, 2024, the Credit Facility was undrawn, and Teradyne was in compliance with all covenants under the Credit Agreement.

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J. PREPAYMENTS

Prepayments consist of the following:

	September 29, 2024		December 31, 2023
	(in thousands)
Contract manufacturer and supplier prepayments	$	439,647	$	502,257
Prepaid taxes		20,734		16,083
Prepaid maintenance and other services		19,040		17,592
Other prepayments		10,127		13,038
Total prepayments (1)	$	489,548	$	548,970

(1)Excludes $5.3 million at December 31, 2023, of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: “Dispositions” for additional information.

K. PRODUCT WARRANTY

Teradyne generally provides a one-year warranty on its products, commencing upon installation, acceptance or shipment. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience. Related costs are charged to the warranty accrual as incurred. The balance below is included in other accrued liabilities.

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
	(in thousands)						(in thousands)
Balance at beginning of period	$	15,244		$	12,543		$	15,698		$	14,181
Accruals for warranties issued during the period		2,149			8,859			8,331			16,237
Accruals related to pre-existing warranties		(545	)		(795	)		(1,513	)		(1,552	)
Settlements made during the period		(2,990	)		(5,892	)		(8,658	)		(14,151	)
Balance at end of period	$	13,858		$	14,715		$	13,858		$	14,715

When Teradyne receives revenue for extended warranties beyond one year it is treated as a separate performance obligation and deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. The balance below is included in short and long-term deferred revenue and customer advances.

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
	(in thousands)						(in thousands)
Balance at beginning of period	$	33,512		$	44,422		$	34,897		$	56,180
Deferral of new extended warranty revenue		9,714			2,734			22,316			11,615
Recognition of extended warranty deferred revenue		(4,297	)		(8,313	)		(18,284	)		(28,952	)
Balance at end of period	$	38,929		$	38,843		$	38,929		$	38,843

L. STOCK-BASED COMPENSATION

On February 1, 2023 (the “Retirement Date”), Mark E. Jagiela retired as Chief Executive Officer of Teradyne and a member of Teradyne’s Board of Directors, and Teradyne entered into an agreement (the “Retirement Agreement”) with Mr. Jagiela. Under the Retirement Agreement, Mr. Jagiela’s unvested time-based restricted stock units and stock options granted prior to his Retirement Date were modified to allow continued vesting; and any vested options or options that vest during that period may be exercised for the remainder of the applicable option term. During the nine months ended October 1, 2023, Teradyne recorded a stock-based compensation expense of $5.9 million related to the Retirement Agreement.

Under Teradyne’s stock compensation plans, Teradyne grants time-based restricted stock units, performance-based restricted stock units and stock options, and employees are eligible to purchase Teradyne’s common stock through its Employee Stock Purchase Plan (“ESPP”).

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Service-based restricted stock unit awards granted to employees vest in equal annual installments over four years. Restricted stock unit awards granted to non-employee directors vest after a one-year period, with 100% of the award vesting on the earlier of (a) the first anniversary of the grant date or (b) the date of the following year’s Annual Meeting of Shareholders. Teradyne expenses the cost of the restricted stock unit awards subject to time-based vesting, which is determined to be the fair market value of the shares at the date of grant, ratably over the period during which the restrictions lapse.

Performance-based restricted stock units (“PRSUs”) granted to Teradyne’s executive officers may have a performance metric based on relative total shareholder return (“TSR”). Teradyne’s three-year TSR performance is measured against the New York Stock Exchange (“NYSE”) Composite Index. The final number of TSR PRSUs that vest will vary based upon the level of performance achieved from 0% to 200% of the target shares. The TSR PRSUs will vest upon the three-year anniversary of the grant date. The TSR PRSUs are valued using a Monte Carlo simulation model. The number of units expected to be earned, based upon the achievement of the TSR market condition, is factored into the grant date Monte Carlo valuation. Compensation expense is recognized on a straight-line basis over the shorter of the three-year service period or the period from the grant to the date described in the retirement provisions below. Compensation expense for executive officers meeting the retirement provisions prior to the grant date is recognized during the year following the grant. Compensation expense is recognized regardless of the eventual number of units that are earned based upon the market condition, provided the executive officer remains an employee at the end of the three-year period. Compensation expense is reversed if at any time during the three-year service period the executive officer is no longer an employee, subject to the retirement and termination eligibility provisions noted below.

PRSUs granted to Teradyne’s executive officers may also have a performance metric based on three-year cumulative non-GAAP profit before interest and tax (“PBIT”) as a percent of Teradyne’s revenue. Non-GAAP PBIT is a financial measure equal to GAAP income from operations less restructuring and other, net; amortization of acquired intangible assets; acquisition and divestiture related charges or credits; pension actuarial gains and losses; non-cash convertible debt interest expense; and other non-recurring gains and charges. The final number of PBIT PRSUs that vest will vary based upon the level of performance achieved from 0% to 200% of the target shares. The PBIT PRSUs will vest upon the three-year anniversary of the grant date. Compensation expense is recognized on a straight-line basis over the shorter of the three-year service period or the period from the grant date to the date described in the retirement provisions below. Compensation expense for executive officers meeting the retirement provisions prior to the grant date is recognized during the year following the grant. Compensation expense is recognized based on the number of units that are earned based upon the three-year Teradyne PBIT as a percent of Teradyne’s revenue, provided the executive officer remains an employee at the end of the three-year period subject to the retirement and termination eligibility provisions noted below.

If a PRSU recipient’s employment ends prior to the determination of the performance percentage due to (1) death or (2) after attaining both at least age sixty and at least ten years of service, retirement or termination other than for cause, then all or a portion of the recipient’s PRSUs (based on the actual performance percentage achieved on the determination date) will vest on the date the performance percentage is determined. Except as set forth in the preceding sentence, no PRSUs will vest if the executive officer is no longer an employee at the end of the three-year period. Stock options to purchase Teradyne’s common stock at 100% of the fair market value on the grant date vest in equal annual installments over four years from the grant date and have a maximum term of seven years.

On January 22, 2024, the Board enacted the Executive Retirement Policy for Restricted Stock Unit and Option Vesting (the "Retirement Policy"). Under the Retirement Policy, an executive officer that is over the age of 65 and has 10 or more years of service as of the effective date of his or her retirement will be eligible for continued vesting of his or her unvested time-based restricted stock units and stock options granted prior to his or her retirement date.

During the nine months ended September 29, 2024, and October 1, 2023, Teradyne granted 0.6 million and 0.5 million of service-based restricted stock unit awards to employees at a weighted average grant date fair value of $95.98 and $102.66, respectively, and less than 0.1 million and 0.1 million of service-based restricted stock unit awards to non-employee directors at a weighted average grant date fair value of $120.38 and $90.50, respectively.

During the nine months ended September 29, 2024, and October 1, 2023, Teradyne granted 0.1 million and 0.1 million of PBIT PRSUs with a weighted average grant date fair value of $94.51 and $102.91, respectively.

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During the nine months ended September 29, 2024, and October 1, 2023, Teradyne granted 0.1 million and 0.1 million of TSR PRSUs, with a weighted average grant date fair value of $102.51 and $139.04, respectively. The grant date fair value was estimated using the Monte Carlo simulation model with the following assumptions:

	For the Nine Months  Ended
	September 29, 2024			October 1, 2023
Risk-free interest rate		3.9	%		4.0	%
Teradyne volatility-historical		42.4	%		49.7	%
NYSE Composite Index volatility-historical		15.6	%		24.1	%
Dividend yield		0.5	%		0.4	%

Expected volatility was based on the historical volatility of Teradyne’s stock and the NYSE Composite Index over the most recent three-year period. The risk-free interest rate was determined using the U.S. Treasury yield curve in effect at the time of the applicable grant. Dividend yield was based upon an estimated annual dividend amount of $0.48 per share divided by Teradyne’s stock price on the grant dates, which have a weighted average grant date stock price of $95.83 for the 2024 grants, and an estimated annual dividend amount of $0.44 per share divided by Teradyne’s stock price on the grant date of $104.12 for the 2023 grant.

During the nine months ended September 29, 2024, and October 1, 2023, Teradyne granted 0.1 million and 0.1 million of service-based stock options to executive officers at a weighted average grant date fair value of $37.50 and $41.23, respectively.

The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions:

	For the Nine Months  Ended
	September 29, 2024			October 1, 2023
Expected life (years)		4.0			4.0
Risk-free interest rate		4.0	%		3.8	%
Volatility-historical		46.3	%		46.6	%
Dividend yield		0.5	%		0.4	%

Teradyne determined the stock options’ expected life based upon historical exercise data for executive officers, the age of the executive officers and the terms of the stock option grant. Volatility was determined using historical volatility for a period equal to the expected life. The risk-free interest rate was determined using the U.S. Treasury yield curve in effect at the time of grant. Dividend yield was based upon an estimated annual dividend amount of $0.48 per share divided by Teradyne’s stock price on the grant date of $95.14 for the 2024 grant and an estimated annual dividend amount of $0.44 per share divided by Teradyne’s stock price on the grant date of $104.15 for the 2023 grant.

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M. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

Changes in accumulated other comprehensive income (loss), which are presented net of tax, consist of the following:

	Foreign Currency Translation Adjustment			Unrealized (Losses) Gains on Marketable Securities			Unrealized (Losses) Gains on Cash Flow Hedges			Retirement Plans Prior Service Credit			Total
	(in thousands)
Nine Months Ended September 29, 2024
Balance at December 31, 2023, net of tax of $0, $(1,728), $142, $(1,132), respectively	$	(22,442	)	$	(6,194	)	$	506		$	1,152		$	(26,978	)
Other comprehensive (loss) gain before reclassifications, net of tax of $0, $205, $285, $0, respectively		22,751			885			1,014			—			24,650
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of $0, $24, $(500), $(1), respectively		—			86			(1,780	)		(6	)		(1,700	)
Net current period other comprehensive (loss) gain, net of tax of $0, $229, $(215), $(1), respectively		22,751			971			(766	)		(6	)		22,950
Balance at September 29, 2024, net of tax of $0, $(1,499), $(73), $(1,133), respectively	$	309		$	(5,223	)	$	(260	)	$	1,146		$	(4,028	)
Nine Months Ended October 1, 2023
Balance at December 31, 2022, net of tax of $0, $(2,308), $(708), $(1,130), respectively	$	(39,849	)	$	(8,661	)	$	(2,517	)	$	1,159		$	(49,868	)
Other comprehensive (loss) gain before reclassifications, net of tax of $0, $(408), $1,816, $0, respectively		(2,073	)		(903	)		6,456			—			3,480
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of $0, $9, $(441), $(1), respectively		—			33			(1,567	)		(6	)		(1,540	)
Net current period other comprehensive (loss) gain, net of tax of $0, $(399), $1,375, $(1), respectively		(2,073	)		(870	)		4,889			(6	)		1,940
Balance at October 1, 2023, net of tax of $0, $(2,707), $667, $(1,131), respectively	$	(41,922	)	$	(9,531	)	$	2,372		$	1,153		$	(47,928	)

Reclassifications out of accumulated other comprehensive income (loss) to the statement of operations for the three and nine months ended September 29, 2024, and October 1, 2023, were as follows:

Details about Accumulated Other Comprehensive Income (Loss) Components	For the Three Months  Ended				For the Nine Months  Ended						Affected Line Item in the Statements of Operations
	September 29, 2024		October 1, 2023		September 29, 2024			October 1, 2023
	(in thousands)				(in thousands)
Available-for-sale marketable securities:
Unrealized (losses) gains, net of tax of $2, $0, $(24), $(9), respectively	$	7	$	—	$	(86	)	$	(33	)	Other (income) expense, net
Cash flow hedges:
Unrealized (losses) gains, net of tax of $0, $869, $500, $441, respectively		—		3,091		1,780			1,567		Revenue
Defined benefit pension and postretirement plans:
Amortization of prior service credit, net of tax of $0, $0, $1, $1, respectively		2		2		6			6		(a)
Total reclassifications, net of tax of $2, $869, $477, $433 respectively	$	9	$	3,093	$	1,700		$	1,540		Net income

(a)The amortization of prior service credit is included in the computation of net periodic postretirement benefit cost. See Note Q: “Retirement Plans.”

N. GOODWILL AND ACQUIRED INTANGIBLE ASSETS

Goodwill

Teradyne performs its annual goodwill impairment test as required under the provisions of ASC 350-10, “Intangibles—Goodwill and Other” on December 31 of each fiscal year unless interim indicators of impairment exist. In the nine months ended September 29, 2024, there were no interim indicators of impairment. Goodwill is considered impaired when the net book value of a reporting unit exceeds its estimated fair value.

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The changes in the carrying amount of goodwill by reportable segments for the nine months ended September 29, 2024, were as follows:

	Robotics		Wireless Test			Semiconductor Test			System Test			Total
	(in thousands)
Balance at December 31, 2023
Goodwill	$	395,463	$	361,819		$	262,237		$	158,699		$	1,178,218
Accumulated impairment losses		—		(353,843	)		(260,540	)		(148,183	)		(762,566	)
Total Goodwill		395,463		7,976			1,697			10,516			415,652
Foreign currency translation adjustment		3,765		—			(5	)		—			3,760
Balance at September 29, 2024
Goodwill	$	399,229	$	361,819		$	262,232		$	158,699			1,181,978
Accumulated impairment losses		—		(353,843	)		(260,540	)		(148,183	)		(762,566	)
Total Goodwill	$	399,229	$	7,976		$	1,692		$	10,516		$	419,412

Intangible Assets

Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet:

	Gross Carrying Amount		Accumulated Amortization			Foreign Currency Translation Adjustment			Net Carrying Amount
	(in thousands)
Balance at September 29, 2024
Developed technology	$	267,706	$	(252,406	)	$	(5,337	)	$	9,963
Customer relationships		52,109		(49,134	)		210			3,185
Tradenames and trademarks		59,007		(49,618	)		(1,249	)		8,140
Total intangible assets	$	378,822	$	(351,158	)	$	(6,376	)	$	21,288
Balance at December 31, 2023
Developed technology	$	267,706	$	(243,191	)	$	(5,343	)	$	19,172
Customer relationships		52,109		(47,850	)		232			4,491
Tradenames and trademarks		59,007		(46,021	)		(1,245	)		11,741
Total intangible assets	$	378,822	$	(337,062	)	$	(6,356	)	$	35,404

Aggregate intangible asset amortization expense was $4.7 million and $14.1 million, respectively, for the three and nine months ended September 29, 2024, and $4.7 million and $14.3 million, respectively, for the three and nine months ended October 1, 2023.

Estimated intangible asset amortization expense for each of the five succeeding fiscal years and thereafter is as follows:

Year	Amortization Expense
	(in thousands)
2024	$	4,775
2025		11,454
2026		2,402
2027		1,185
2028		1,104
Thereafter		368

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O. NET INCOME PER COMMON SHARE

The following table sets forth the computation of basic and diluted net income per common share:

	For the Three Months  Ended				For the Nine Months  Ended
	September 29, 2024		October 1, 2023		September 29, 2024		October 1, 2023
	(in thousands, except per share amounts)				(in thousands, except per share amounts)
Net income for basic and diluted net income per share	$	145,649	$	128,116	$	396,119	$	331,698
Weighted average common shares-basic		163,002		153,762		157,951		154,809
Effect of dilutive potential common shares:
Restricted stock units		768		455		637		410
Convertible note hedge warrant shares (1)		460		9,168		4,751		9,009
Stock options		13		26		13		39
Employee stock purchase plan		10		10		5		8
Incremental shares from assumed conversion of convertible notes (2)		—		629		—		762
Dilutive potential common shares		1,251		10,288		5,406		10,228
Weighted average common shares-diluted		164,253		164,050		163,357		165,037
Net income per common share-basic	$	0.89	$	0.83	$	2.51	$	2.14
Net income per common share-diluted	$	0.89	$	0.78	$	2.42	$	2.01

(1)Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price, multiplied by the number of warrant shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period.

(2)Incremental shares from assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible notes, was divided by the average Teradyne stock price for the period.

The computation of diluted net income per common share for the three and nine months ended September 29, 2024, excludes the effect of the potential vesting of 0.1 million and 0.5 million, respectively, of restricted stock units because the effect would have been anti-dilutive.

The computation of diluted net income per common share for the three and nine months ended October 1, 2023, excludes the effect of the potential vesting of 0.1 million and 0.4 million, respectively, of restricted stock units because the effect would have been anti-dilutive.

P. RESTRUCTURING AND OTHER

During the three months ended September 29, 2024, Teradyne recorded restructuring and other charges primarily related to $1.3 million of severance charges related to headcount reductions principally in Robotics.

During the three months ended October 1, 2023, Teradyne recorded restructuring and other charges primarily related to $4.7 million of severance charges related to headcount reductions of 94 people, principally in Semiconductor Test and Robotics, which included charges related to a voluntary early retirement program for employees meeting certain conditions, and a $1.5 million contract termination charge.

During the nine months ended September 29, 2024, Teradyne recorded restructuring and other charges primarily related to $5.3 million of severance and other charges, related to headcount reductions of 87 people primarily in Robotics and Semiconductor Test, which included charges related to a voluntary early retirement program for employees meeting certain conditions, and $2.2 million of acquisition and divestiture expenses related to the Technoprobe transactions.

During the nine months ended October 1, 2023, Teradyne recorded restructuring and other charges primarily related to $11.8 million of severance charges related to headcount reductions of 197 people, primarily in Semiconductor Test and Robotics, which included which included charges related to a voluntary early retirement program for employees meeting certain conditions, a $1.5 million contract termination charge, and a charge of $1.1 million for an increase in environmental liability.

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Q. RETIREMENT PLANS

ASC 715, “Compensation—Retirement Benefits,” requires an employer with defined benefit plans or other postretirement benefit plans to recognize an asset or a liability on its balance sheet for the overfunded or underfunded status of the plans as defined by ASC 715. The pension asset or liability represents a difference between the fair value of the pension plan’s assets and the projected benefit obligation at December 31. Teradyne uses a December 31 measurement date for all its plans.

Defined Benefit Pension Plans

Teradyne has defined benefit pension plans covering a portion of domestic employees and employees of certain non-U.S. subsidiaries. Benefits under these plans are based on employees’ years of service and compensation. Teradyne’s funding policy is to make contributions to these plans in accordance with local laws and to the extent that such contributions are tax deductible. The assets of the U.S. qualified pension plan consist primarily of fixed income and equity securities. In addition, Teradyne has an unfunded supplemental executive defined benefit plan in the United States to provide retirement benefits in excess of levels allowed by the Employment Retirement Income Security Act (“ERISA”) and the Internal Revenue Code (the “IRC”), as well as unfunded qualified foreign plans.

During the three months ended September 29, 2024, Teradyne purchased a group annuity contract for its retiree participants in the U.S. qualified pension plan. Under the group annuity, the accrued pension obligation for 132 retiree participants were transferred to an insurance company. The reduction in the pension benefit obligation and pension assets was $23.4 million. During the three and nine months ended September 29, 2024, Teradyne recorded settlement expense of $0.4 million related to the retiree group annuity transaction.

In the nine months ended September 29, 2024, and October 1, 2023, Teradyne contributed $2.3 million and $2.3 million, respectively, to the U.S. supplemental executive defined benefit pension plan, and $0.8 million and $0.8 million, respectively, to certain qualified pension plans for non-U.S. subsidiaries.

For the three and nine months ended September 29, 2024, and October 1, 2023, Teradyne’s net periodic pension cost was comprised of the following:

	For the Three Months Ended
	September 29, 2024						October 1, 2023
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	216		$	119		$	272		$	107
Interest cost		1,590			256			1,713			253
Expected return on plan assets		(1,204	)		(23	)		(1,286	)		(11	)
Net actuarial loss (gain)		(2,262	)		—			—			66
Settlement expense		394			—			—			5
Total net periodic pension cost	$	(1,266	)	$	352		$	699		$	420

	For the Nine Months Ended
	September 29, 2024						October 1, 2023
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	665		$	360		$	815		$	320
Interest cost		4,883			766			5,138			762
Expected return on plan assets		(3,737	)		(58	)		(3,856	)		(28	)
Net actuarial loss (gain)		(2,151	)		(242	)		24			66
Settlement expense		394			(24	)		—			5
Total net periodic pension cost	$	54		$	802		$	2,121		$	1,125

Postretirement Benefit Plan

In addition to receiving pension benefits, Teradyne employees in the United States who meet early retirement eligibility requirements as of their termination dates may participate in Teradyne’s Welfare Plan, which includes medical and dental benefits up to age 65. Death benefits provide a fixed sum to retirees’ survivors and are available to all retirees. Substantially all of Teradyne’s current U.S. employees could become eligible for these benefits and the existing benefit obligation relates predominantly to those

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employees. During the nine months ended September 29, 2024, Teradyne recorded special termination benefit charges associated with a voluntary early retirement program.

For the three and nine months ended September 29, 2024, and October 1, 2023, Teradyne’s net periodic postretirement benefit cost was comprised of the following:

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
	(in thousands)						(in thousands)
Service cost	$	9		$	9		$	28		$	26
Interest cost		72			60			217			181
Amortization of prior service credit		(2	)		(2	)		(7	)		(7	)
Special termination benefits		—			1,423			462			1,792
Net actuarial loss (gain)		—			—			(94	)		30
Total net periodic postretirement benefit cost	$	79		$	1,490		$	606		$	2,022

R. COMMITMENTS AND CONTINGENCIES

Purchase Commitments

As of September 29, 2024, Teradyne had entered into purchase commitments for certain components and materials. The purchase commitments covered by the agreements aggregate to approximately $458.1 million, of which $445.9 million is for less than one year.

Legal Claims

Teradyne is subject to various legal proceedings and claims which have arisen in the ordinary course of business such as, but not limited to, patent, employment, commercial and environmental matters. Teradyne believes that it has meritorious defenses against all pending claims and intends to vigorously contest them. While it is not possible to predict or determine the outcomes of any pending claims or to provide possible ranges of losses that may arise, Teradyne believes the potential losses associated with all of these actions are unlikely to have a material adverse effect on its business, financial position or results of operations.

Guarantees and Indemnification Obligations

Teradyne provides indemnification, to the extent permitted by law, to its officers, directors, employees and agents for liabilities arising from certain events or occurrences, while the officer, director, employee, or agent, is or was serving, at Teradyne’s request in such capacity. Teradyne may enter into indemnification agreements with certain of its officers and directors. With respect to acquisitions, Teradyne provides indemnifications to or assumes indemnification obligations for the current and former directors, officers and employees of the acquired companies in accordance with the acquired companies’ by-laws and charter. As a matter of practice, Teradyne has maintained directors’ and officers’ liability insurance coverage including coverage for directors and officers of acquired companies.

Teradyne enters into agreements in the ordinary course of business with customers, resellers, distributors, integrators, and suppliers. Most of these agreements require Teradyne to defend and/or indemnify the other party against intellectual property infringement claims brought by a third party with respect to Teradyne’s products. From time to time, Teradyne also indemnifies customers and business partners for damages, losses and liabilities they may suffer or incur relating to personal injury, personal property damage, product liability, breach of confidentiality obligations and environmental claims relating to the use of Teradyne’s products and services or resulting from the acts or omissions of Teradyne, its employees, authorized agents or subcontractors. On occasion, Teradyne has also provided guarantees to customers regarding the delivery and performance of its products in addition to the warranty described below.

As a matter of ordinary course of business, Teradyne warrants that its products will substantially perform in accordance with its standard published specifications in effect at the time of delivery. Most warranties have a one-year duration commencing from installation. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based upon historical experience. When Teradyne receives revenue for extended warranties beyond the standard duration, the revenue is deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. As of September 29, 2024, and December 31, 2023, Teradyne had a product warranty accrual of $13.9 million and $15.7 million, respectively, included in other

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accrued liabilities and revenue deferrals related to extended warranties of $38.9 million and $34.9 million, respectively, included in short and long-term deferred revenue and customer advances.

In addition, in the ordinary course of business, Teradyne provides minimum purchase guarantees to certain vendors to ensure continuity of supply against the market demand. Although some of these guarantees provide penalties for cancellations and/or modifications to the purchase commitments as the market demand decreases, most of the guarantees do not. Therefore, as the market demand decreases, Teradyne re-evaluates these guarantees and determines what charges, if any, should be recorded.

With respect to its agreements covering product, business or entity divestitures and acquisitions, Teradyne provides certain representations, warranties and covenants to purchasers and agrees to indemnify and hold such purchasers harmless against breaches of such representations, warranties, and covenants. Many of the indemnification claims have a definite expiration date while some remain in force indefinitely. With respect to its acquisitions, Teradyne may, from time to time, assume the liability for certain events or occurrences that took place prior to the date of acquisition.

As a matter of ordinary course of business, Teradyne occasionally guarantees certain indebtedness obligations of its subsidiary companies, limited to the borrowings from financial institutions, purchase commitments to certain vendors and lease commitments to landlords.

Based on historical experience and information known as of September 29, 2024, and December 31, 2023, except for product warranty, Teradyne has not recorded any liabilities for these guarantees and obligations because the amount would be immaterial.

S. INCOME TAXES

A reconciliation of the United States federal statutory corporate tax rate to Teradyne’s effective tax rate was as follows:

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
U.S. statutory federal tax rate		21.0	%		21.0	%		21.0	%		21.0	%
Non-deductible officers' compensation		0.5			1.3			0.4			1.1
Tax credits		(5.0	)		(9.3	)		(3.6	)		(5.0	)
Discrete expense (benefit) related to reserves for uncertain tax positions		(4.9	)		0.3			(2.2	)		0.1
Foreign taxes		(4.9	)		(1.5	)		(3.3	)		(1.1	)
International provisions of the U.S. Tax Cuts and Jobs Act of 2017		(0.8	)		(3.1	)		(1.1	)		(2.9	)
Other, net		1.9			2.5			0.8			0.8
Effective tax rate		7.8	%		11.2	%		12.0	%		14.0	%

On a quarterly basis, Teradyne evaluates the realizability of the deferred tax assets by jurisdiction and assesses the need for a valuation allowance. As of September 29, 2024, Teradyne believes that it will ultimately realize the deferred tax assets recorded on the condensed consolidated balance sheet. However, should Teradyne believe that it is more-likely-than-not that the deferred tax assets would not be realized, the tax provision would increase in the period in which Teradyne determined that the realizability was not likely. Teradyne considers the probability of future taxable income and historical profitability, among other factors, in assessing the realizability of the deferred tax assets.

As of September 29, 2024, and December 31, 2023, Teradyne had $7.6 million and $18.6 million, respectively, of reserves for uncertain tax positions. The $11.0 million net decrease in reserves for uncertain tax positions is related to the audit settlements.

As of September 29, 2024, Teradyne estimates that it is reasonably possible that the balance of unrecognized tax benefits may decrease approximately $0.7 million in the next twelve months because of a lapse of statutes of limitation. The estimated decrease relates to transfer pricing and U.S. federal and state research and development credits.

Teradyne recognizes interest and penalties related to income tax matters in income tax expense. As of September 29, 2024, and December 31, 2023, $0.2 million and $1.3 million, respectively, of interest and penalties were accrued for uncertain tax positions. For the nine months ended September 29, 2024, and October 1, 2023, a benefit of $1.0 million and expense of $0.2 million, respectively, were recorded for interest and penalties related to income tax items.

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Teradyne qualifies for a tax holiday in Singapore by fulfilling the requirements of an agreement with the Singapore Economic Development Board under which certain headcount and spending requirements must be met. The tax savings due to the tax holiday for the nine months ended September 29, 2024, were $10.2 million, or $0.06 per diluted share. The tax savings due to the tax holiday for the nine months ended October 1, 2023, were $1.7 million, or $0.01 per diluted share. In November 2020, Teradyne entered into an agreement with the Singapore Economic Development Board which extended Teradyne's Singapore tax holiday under substantially similar terms to the agreement which expired on December 31, 2020. The new tax holiday is scheduled to expire on December 31, 2025.

In the nine months ended September 29, 2024, Teradyne recognized a $57.5 million gain on the sale of the Device Interface Solutions business which resulted in $10.7 million of income tax expense that was recognized as a discrete expense during the period in which the gain occurred.

On August 16, 2022, the Inflation Reduction Act of 2022 (“IRA”) was signed into law. The IRA introduced a 15% alternative minimum tax based on the financial statement income of certain large corporations (“CAMT”), effective January 1, 2023. Teradyne currently does not expect the CAMT to have a material impact on its financial results.

On December 15, 2022, the European Union ("EU") Member States formally adopted the EU’s Pillar Two Directive, which generally provides for a minimum effective tax rate of 15%, as established by the Organization for Economic Co-operation and Development ("OECD") Pillar Two Framework. The EU’s Pillar Two Directive effective dates are January 1, 2024, and January 1, 2025, for different aspects of the directive. On July 17, 2023, the OECD published Administrative Guidance proposing certain safe harbor rules that effectively extend certain effective dates to January 1, 2027. Certain EU Member States where Teradyne has a legal presence have recently enacted the directive and administrative guidance into their local tax legislation. Additionally, countries outside the EU where Teradyne has a legal presence have enacted similar language as the EU Members States in their local tax legislation. Teradyne is closely monitoring these developments and evaluating the potential financial impact on income tax expense. As of September 29, 2024, the effective tax rate was impacted by legislative changes that went into effect for Pillar Two in some of Teradyne's foreign jurisdictions, but it did not have a material impact on its financial statements.

T. SEGMENT INFORMATION

Teradyne has four reportable segments (Semiconductor Test, System Test, Wireless Test and Robotics). Each of the reportable segments represents an individual operating segment.

The Semiconductor Test segment includes operations related to the design, manufacturing and marketing of semiconductor test products and services. The System Test segment includes operations related to the design, manufacturing and marketing of products and services for storage and system level test, defense/aerospace instrumentation test, and circuit-board test. The Wireless Test segment includes operations related to the design, manufacturing and marketing of wireless test products and services. The Robotics segment includes operations related to the design, manufacturing and marketing of collaborative robotic arms, autonomous mobile robots, and advanced robotic control software. Each operating segment has a segment manager who is accountable to and maintains regular contract with Teradyne’s chief operating decision maker (Teradyne’s chief executive officer) to discuss operating activities, financial results, forecasts, and plans for the segment.

Teradyne evaluates performance based on several factors, of which the primary financial measure is business segment income (loss) before income taxes. The accounting policies of the business segments are the same as those described in Note B: “Accounting Policies” in Teradyne’s Annual Report on Form 10-K for the year ended December 31, 2023.

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Segment information for the three and nine months ended September 29, 2024, and October 1, 2023, is as follows:

	Semiconductor Test		System Test		Robotics			Wireless Test		Segment Total		Corporate and Eliminations			Consolidated
	(in thousands)
Three Months Ended September 29, 2024
Revenues	$	542,734	$	73,312	$	88,651		$	32,601	$	737,298	$	—		$	737,298
Income (loss) before income taxes (1)(2)		163,778		12,522		(24,206	)		4,279	$	156,373		2,611		$	158,984
Total assets (3)		1,308,031		178,291		794,277			76,882	$	2,357,481		1,412,247		$	3,769,728
Three Months Ended October 1, 2023
Revenues	$	497,863	$	83,203	$	85,692		$	36,974	$	703,732	$	—		$	703,732
Income (loss) before income taxes (1)(2)		136,451		23,754		(21,812	)		9,469	$	147,862		(3,582	)	$	144,280
Total assets (3)		1,382,444		178,904		684,207			92,514	$	2,338,069		1,032,586		$	3,370,655
Nine Months Ended September 29, 2024
Revenues	$	1,497,552	$	209,435	$	266,552		$	93,457	$	2,066,996	$	—		$	2,066,996
Income (loss) before income taxes (1)(2)		401,475		36,138		(56,099	)		13,355	$	394,869		56,420		$	451,289
Total assets (3)		1,308,031		178,291		794,277			76,882	$	2,357,481		1,412,247		$	3,769,728
Nine Months Ended October 1, 2023
Revenues	$	1,387,580	$	252,106	$	246,541		$	119,472	$	2,005,699	$	—		$	2,005,699
Income (loss) before income taxes (1)(2)		361,676		67,629		(66,704	)		30,841	$	393,442		(7,675	)	$	385,767
Total assets (3)		1,382,444		178,904		684,207			92,514	$	2,338,069		1,032,586		$	3,370,655

(1)Included in Corporate and Eliminations are interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, severance charges, pension, acquisition and divestiture related fees, and an expense for the modification of outstanding equity awards.

(2)Included in income (loss) before taxes are charges related to restructuring and other, expense for the modification of outstanding equity awards, legal settlement, pension mark-to-market, and inventory charges.

(3)Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.

Included in each segment are charges and credits in the following line items in the statements of operations:

	For the Three Months  Ended				For the Nine Months  Ended
	September 29, 2024		October 1, 2023		September 29, 2024		October 1, 2023
	(in thousands)				(in thousands)
Semiconductor Test:
Cost of revenues—inventory charge	$	4,041	$	10,422	$	11,405	$	18,374
Restructuring and other—employee severance		—		1,776		1,277		5,055
System Test:
Cost of revenues—inventory charge	$	—	$	—	$	1,016	$	1,412
Restructuring and other—employee severance		—		—		—		1,124
Robotics:
Cost of revenues—legal settlement	$	3,600	$	—	$	3,600	$	—
Restructuring and other—employee severance		1,110		636		2,647		2,707
Cost of revenues—inventory charge		537		652		1,071		2,203
Wireless:
Cost of revenues—inventory charge	$	1,204	$	—	$	2,024	$	1,080
Corporate and Eliminations:
Restructuring and other—acquisition & divestiture related expenses	$	—	$	—	$	2,214	$	—
Selling and administrative —equity modification		—		—		1,469		5,889
Restructuring and other—employee severance		—		1,753		—		2,877
Restructuring and other—contract termination		—		1,511		—		1,511
Restructuring and other—other		2,437		—		2,437		1,100

U. SHAREHOLDERS’ EQUITY

Stock Repurchase Program

In January 2023, Teradyne’s Board of Directors cancelled its January 2021 repurchase program and approved a new repurchase program for up to $2.0 billion of common stock. As of January 1, 2023, share repurchases in excess of issuances are subject to a 1% excise tax, which is included as part of the cost basis of the shares acquired. In 2024, Teradyne intends, based on market conditions, to

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repurchase its common stock in an amount necessary to offset dilution from equity compensation and our employee share purchase program.

During the nine months ended September 29, 2024, Teradyne repurchased 0.5 million shares of common stock for a total cost of $55.1 million at an average price of $111.32 per share. The cumulative repurchases under the January 2023 repurchase program as of September 29, 2024, were 4.4 million shares of common stock for $455.6 million at an average price per share of $103.46.

During the nine months ended October 1, 2023, Teradyne repurchased 3.4 million shares of common stock for a total cost of $349.3 million at an average price of $103.89 per share.

The total cost of shares acquired includes commissions and related excise tax and is recorded as a reduction to retained earnings.

Dividend

Holders of Teradyne’s common stock are entitled to receive dividends when they are declared by Teradyne’s Board of Directors.

In January 2024, May 2024, and August 2024, Teradyne’s Board of Directors declared a quarterly cash dividend of $0.12 per share. Dividend payments for the three and nine months ended September 29, 2024, were $19.6 million and $57.0 million, respectively.

In January 2023, May 2023, and August 2023, Teradyne’s Board of Directors declared a quarterly cash dividend of $0.11 per share. Dividend payments for the three and nine months ended October 1, 2023, were $16.9 million and $51.1 million, respectively.

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Item 2: Management’s Discussion and Analysis of Financial Condition and Results of Operations

Statements in this Quarterly Report on Form 10-Q which are not historical facts, so called “forward-looking statements,” are made pursuant to the safe harbor provisions of Section 21E of the Securities Exchange Act of 1934, as amended. Investors are cautioned that all forward-looking statements involve risks and uncertainties, including those detailed in our filings with the Securities and Exchange Commission. See also Part II, Item 1A of this Quarterly Report on Form 10-Q and Part I, Item 1A “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2023. Readers are cautioned not to place undue reliance on these forward-looking statements which reflect management’s analysis only as of the date hereof. We assume no obligation to update these forward-looking statements to reflect actual results or changes in factors or assumptions affecting forward-looking statements, except as may be required by law.

Overview

We are a leading global supplier of automated test equipment and robotics products. We design, develop, manufacture, and sell automatic test systems and robotics products. Our automatic test systems are used to test semiconductors, wireless products, data storage and complex electronics systems in many industries including the consumer electronics, wireless, automotive, industrial, computing, communications, and aerospace and defense industries. Our robotics products include collaborative robotic arms and autonomous mobile robots (“AMRs”) used by global manufacturing, logistics and industrial customers to improve quality, increase manufacturing and material handling efficiency, and decrease manufacturing and logistics costs. Our automatic test equipment and robotics products and services include:

•semiconductor test (“Semiconductor Test”) systems;

•storage and system level test (“Integrated System Test”, formally "Storage Test") systems, defense/aerospace (“Defense/Aerospace”) test instrumentation and systems, and circuit-board test and inspection (“Production Board Test”) systems (collectively these products represent “System Test”);

•wireless test (“Wireless Test”) systems; and

•robotics (“Robotics”) products.

The market for our test products is concentrated with a limited number of significant customers accounting for a substantial portion of the purchases of test equipment. A few customers drive significant demand for our test products both through direct sales and sales to the customers’ supply partners. We expect that sales of our test products will continue to be concentrated with a limited number of significant customers for the foreseeable future.

In the third quarter of 2024, we saw strength in Semiconductor Test performance driven in System-on-a-chip by compute and in memory by DRAM and high bandwidth memory. We expect compute and memory to continue to drive meaningful demand in the fourth quarter of 2024, helping to offset weakness in the mobility test market. We anticipate an eventual upturn in mobility at some point in 2025.

Our Robotics segment consists of Universal Robots A/S (“UR”), a leading supplier of collaborative robotic arms, and Mobile Industrial Robots A/S (“MiR”), a leading maker of AMRs for industrial automation. The market for our Robotics segment products is dependent on the adoption of new automation technologies by large manufacturers as well as small and medium enterprises (“SMEs”) throughout the world. Robotics results in the third quarter of 2024 were in line with our revenue forecast, putting us in position for full year growth due to new product offerings and expansion of our Original Equipment Manufacturer (“OEM”) and large account channels, along with increasing recurring revenue through new service and software offerings.

On November 7, 2023, we and Technoprobe S.p.A, (“Technoprobe”), a leader in the design and production of probe cards, announced the establishment of a strategic partnership that will seek to accelerate growth for both companies and enable higher performance semiconductor test interfaces for customers worldwide. As part of the partnership, on May 27, 2024, we made an investment of $524.1 million in exchange for 10% of the issued and outstanding shares of Technoprobe, and we sold our Device Interface Solutions ("DIS") business to Technoprobe in exchange for $85.0 million, net of cash and cash equivalents sold, and a customary working capital adjustment.

Our financial statements are denominated in U.S. dollars. While revenues in our test businesses are predominantly in U.S. dollars, the majority of our Robotics revenue is denominated in foreign currencies. Strengthening of the U.S. dollar would negatively affect Robotics revenue growth in the fourth quarter of 2024.

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Our corporate strategy continues to focus on profitably gaining market share in our test businesses through the introduction of differentiated products that target expanding segments and accelerating growth through continued investment in our Robotics businesses. We have strategically increased engineering and go-to-market spending, primarily in Semiconductor Test and Integrated System Test, in order to support market share gains. We plan to execute on our strategy while balancing capital allocations between returning capital to our shareholders through stock repurchases and dividends and using capital for opportunistic accretive acquisitions.

Critical Accounting Policies and Estimates

We have identified the policies which are critical to understanding our business and our results of operations. There have been no significant changes during the nine months ended September 29, 2024, to the items disclosed as our critical accounting policies and estimates in Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, except as noted below.

Equity method investments

We account for investments using the equity method of accounting when we have significant influence over the financial and operating policies, but not control, of the investee. The equity method investments are initially recorded at cost and included in ‘Equity method investment’ in the consolidated balance sheet. We record our share of investee's net income or loss and the amortization of equity method basis difference, calculated as the difference between the investment and the amount of underlying equity in net assets acquired, on a 3-month lag, which is applied consistently from period to period. These results are reported in ‘Equity in net earnings of affiliate’ in the consolidated statement of operations. We record our share of investee's other comprehensive income and a cumulative translation adjustment in the consolidated statements of comprehensive income, also on a 3-month lag. We monitor on an ongoing basis our equity method investments for indicators of other-than-temporary declines in fair value below carrying value.

Critical accounting estimates are complex and may require significant judgment by management. Changes to the underlying assumptions may have a material impact on our financial condition and results of operations. These estimates may change, as new events occur, and additional information is obtained. Actual results could differ significantly from these estimates under different assumptions or conditions.

Preparation of Financial Statements and Use of Estimates

The preparation of consolidated financial statements requires management to make estimates and judgments that affect the amounts reported in the financial statements. Actual results may differ significantly from these estimates under different assumptions or conditions.

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SELECTED RELATIONSHIPS WITHIN THE CONDENSED CONSOLIDATED

STATEMENTS OF OPERATIONS

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
Percentage of revenues:
Revenues:
Products		83	%		78	%		81	%		78	%
Services		17			22			19			22
Total revenues		100			100			100			100
Cost of revenues:
Cost of products		34			34			34			33
Cost of services		6			9			8			10
Total cost of revenues (exclusive of acquired intangible    assets amortization shown separately below)		41			43			42			42
Gross profit		59			57			58			58
Operating expenses:
Selling and administrative		21			20			22			22
Engineering and development		16			15			16			16
Acquired intangible assets amortization		1			1			1			1
Restructuring and other		1			1			1			1
Gain on sale of business		—			—			(3	)		—
Total operating expenses		39			36			37			39
Income from operations		21			20			21			19
Non-operating (income) expense:
Interest income		(1	)		(1	)		(1	)		(1	)
Interest expense		—			—			—			—
Other (income) expense, net		—			1			1			—
Income before income taxes and equity in net earnings of affiliate		22			21			22			19
Income tax provision		2			2			3			3
Income before equity in net earnings of affiliate		20			18			19			17
Equity in net earnings of affiliate		(0	)		—			(0	)		—
Net income		20	%		18	%		19	%		17	%

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Results of Operations

Third Quarter 2024 Compared to Third Quarter 2023

Revenues

Revenues by our reportable segments were as follows:

	For the Three Months  Ended
	September 29, 2024		October 1, 2023		Dollar Change
	(in millions)
Semiconductor Test	$	542.7	$	497.9	$	44.8
System Test		73.3		83.2		(9.9	)
Robotics		88.7		85.7		3.0
Wireless Test		32.6		37.0		(4.4	)
	$	737.3	$	703.7	$	33.6

The increase in Semiconductor Test revenues of $44.8 million, or 9.0%, was driven primarily by higher tester sales for computing and memory applications, partially offset by lower tester sales for mobility and legacy automotive applications. The decrease in System Test revenues of $9.9 million, or 11.9%, was due principally to lower sales in Integrated System Test of system level and hard disk drive testers. The increase in Robotics revenues of $3.0 million, or 3.5%, was driven predominantly by higher demand for UR’s collaborative robotic arms and MiR’s autonomous mobile robots. The decrease in Wireless Test revenues of $4.4 million, or 11.9% was primarily due to a decrease in ultra-wide band test products.

Revenues by country as a percentage of total revenues were as follows (1):

	For the Three Months  Ended
	September 29, 2024			October 1, 2023
Korea		26	%		15	%
Taiwan		26			14
China		13			12
United States		12			13
Europe		8			9
Japan		2			15
Singapore		2			4
Thailand		2			3
Malaysia		2			3
Philippines		2			8
Rest of World		5			4
		100	%		100	%

(1)Revenues attributable to a country are based on location of customer site.

Gross Profit

Our gross profit was as follows:

	For the Three Months  Ended
	September 29, 2024			October 1, 2023			Dollar/Point Change
	(in millions)
Gross profit	$	436.5		$	398.3		$	38.2
Percent of total revenues		59.2	%		56.6	%		2.6

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Gross profit as a percent of revenue increased by 2.6 points, primarily due to volume and product mix, partially offset by a $3.6 million charge for a legal settlement following a judgment against us for infringement of expired patents in our Robotics business.

Selling and Administrative

Selling and administrative expenses were as follows:

	For the Three Months  Ended
	September 29, 2024			October 1, 2023			Dollar Change
	(in millions)
Selling and administrative	$	157.6		$	138.3		$	19.3
Percent of total revenues		21.4	%		19.7	%

The increase of $19.3 million in selling and administrative expenses was primarily due to higher spending in Semiconductor Test.

Engineering and Development

Engineering and development expenses were as follows:

	For the Three Months  Ended
	September 29, 2024			October 1, 2023			Dollar Change
	(in millions)
Engineering and development	$	117.5		$	104.4		$	13.1
Percent of total revenues		15.9	%		14.8	%

The increase of $13.1 million in engineering and development expenses was primarily due to higher spending in Semiconductor Test.

Restructuring and Other

During the three months ended September 29, 2024, we recorded restructuring and other charges primarily related to $1.3 million of severance charges related to headcount reductions principally in Robotics.

During the three months ended October 1, 2023, we recorded restructuring and other charges primarily related to $4.7 million of severance charges related to headcount reductions of 94 people, principally in Semiconductor Test and Robotics, which included charges related to a voluntary early retirement program for employees meeting certain conditions, and a $1.5 million contract termination charge.

Interest and Other

	For the Three Months  Ended
	September 29, 2024			October 1, 2023			Dollar Change
	(in millions)
Interest income	$	(5.1	)	$	(6.9	)	$	1.8
Interest expense		0.8			1.0		$	(0.2	)
Other (income) expense, net		(2.7	)		5.6		$	(8.3	)

Other (income) expense reflects a net increase of $8.3 million primarily due to foreign exchange and actuarial gains.

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Income (Loss) Before Income Taxes

	For the Three Months  Ended
	September 29, 2024			October 1, 2023			Dollar Change
	(in millions)
Semiconductor Test	$	163.8		$	136.5		$	27.3
System Test		12.5			23.8			(11.3	)
Wireless Test		4.3			9.5			(5.2	)
Robotics		(24.2	)		(21.8	)		(2.4	)
Corporate and Eliminations (1)		2.6			(3.6	)		6.2
	$	159.0		$	144.3		$	14.7

(1)Included in Corporate and Eliminations are interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, severance charges, pension, acquisition and divestiture related fees, and an expense for the modification of outstanding equity awards.

The change in income before income taxes in Semiconductor Test, System Test, and Wireless Test were driven primarily by fluctuations in revenue within each of the businesses. In Robotics, the change in income before income taxes was driven primarily by increases to operating expenses.

Income Taxes

The effective tax rate for the three months ended September 29, 2024, and October 1, 2023, was 7.8% and 11.2%, respectively. The decrease in the effective tax rate from the three months ended October 1, 2023, to the three months ended September 29, 2024, primarily resulted from the benefit of a projected shift in the geographic distribution of income and an increase in benefit related to reserves for uncertain tax positions. These benefits were partially offset by decreases in benefits related to tax credits and the international provision of the U.S. Tax Cuts and Jobs Act of 2017.

Nine Months 2024 Compared to Nine Months 2023

Revenues

Revenues by our reportable segments were as follows:

	For the Nine Months  Ended
	September 29, 2024		October 1, 2023		Dollar Change
	(in millions)
Semiconductor Test	$	1,497.6	$	1,387.6	$	110.0
System Test		209.4		252.1		(42.7	)
Robotics		266.6		246.5		20.1
Wireless Test		93.5		119.5		(26.0	)
	$	2,067.0	$	2,005.7	$	61.3

The increase in Semiconductor Test revenues of $110.0 million, or 7.9%, was driven primarily by higher tester sales for computing, ADAS, and memory applications, partially offset by lower tester sales for mobility and legacy automotive applications. The decrease in System Test revenues of $42.7 million, or 16.9%, was due principally to lower sales in Integrated System Test of system level and hard disk drive testers. The increase in Robotics revenues of $20.1 million, or 8.2%, was predominantly from higher demand for UR’s collaborative robotic arms and MiR’s autonomous mobile robots. The decrease in Wireless Test revenues of $26.0 million, or 21.8%, was primarily due to a decrease in cellular and ultra-wide band test products.

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Revenues by country as a percentage of total revenues were as follows (1):

	For the Nine Months  Ended
	September 29, 2024			October 1, 2023
Korea		28	%		14	%
Taiwan		20			15
United States		13			16
China		11			12
Europe		9			10
Japan		7			12
Philippines		2			6
Singapore		2			5
Malaysia		2			4
Thailand		2			3
Rest of World		4			3
		100	%		100	%

(1)Revenues attributable to a country are based on location of customer site.

Gross Profit

Our gross profit was as follows:

	For the Nine Months  Ended
	September 29, 2024			October 1, 2023			Dollar/Point Change
	(in millions)
Gross profit	$	1,201.6		$	1,157.2		$	44.4
Percent of total revenues		58.1	%		57.7	%		0.4

Gross profit as a percent of revenue increased by 0.4 points, primarily due to product mix, partially offset by a $3.6 million charge for a legal settlement following a judgment against us for infringement of expired patents in our Robotics business.

Selling and Administrative

Selling and administrative expenses were as follows:

	For the Nine Months  Ended
	September 29, 2024			October 1, 2023			Dollar Change
	(in millions)
Selling and administrative	$	461.3		$	435.0		$	26.3
Percent of total revenues		22.3	%		21.7	%

The increase of $26.3 million in selling and administrative expenses was primarily due to higher spending in Semiconductor Test.

Engineering and Development

Engineering and development expenses were as follows:

	For the Nine Months  Ended
	September 29, 2024			October 1, 2023			Dollar Change
	(in millions)
Engineering and development	$	332.5		$	315.9		$	16.6
Percent of total revenues		16.1	%		15.7	%

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The increase of $16.6 million in engineering and development expenses was primarily due to higher spending in Semiconductor Test.

Restructuring and Other

During the nine months ended September 29, 2024, we recorded restructuring and other charges primarily related to $5.3 million of severance and other charges, related to headcount reductions of 87 people primarily in Robotics and Semiconductor Test, which included charges related to a voluntary early retirement program for employees meeting certain conditions, and $2.2 million of acquisition and divestiture expenses related to the Technoprobe transactions.

During the nine months ended October 1, 2023, we recorded restructuring and other charges primarily related to $11.8 million of severance charges related to headcount reductions of 197 people, primarily in Semiconductor Test and Robotics, which included which included charges related to a voluntary early retirement program for employees meeting certain conditions, a $1.5 million contract termination charge, and a charge of $1.1 million for an increase in environmental liability.

Gain on Sale of Business

During the nine months ended September 29, 2024, we recorded a gain of $57.5 million associated with the sale of DIS to Technoprobe.

Interest and Other

	For the Nine Months  Ended
	September 29, 2024			October 1, 2023			Dollar Change
	(in millions)
Interest income	$	(19.7	)	$	(18.5	)	$	(1.2	)
Interest expense		3.0			3.0			—
Other (income) expense, net		5.6			6.5			(0.9	)

Other (income) expense reflects a net decrease of $0.9 million primarily due to the settlement of our call option purchased in connection with the investment in 10% of Technoprobe partially offset by actuarial gains.

Income (Loss) Before Income Taxes

	For the Nine Months  Ended
	September 29, 2024			October 1, 2023			Dollar Change
	(in millions)
Semiconductor Test	$	401.5		$	361.7		$	39.8
System Test		36.1			67.6			(31.5	)
Wireless Test		13.4			30.8			(17.4	)
Robotics		(56.1	)		(66.7	)		10.6
Corporate and Eliminations (1)		56.4			(7.7	)		64.1
	$	451.3		$	385.8		$	65.5

(1)Included in Corporate and Eliminations are gain on sale of business, interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, severance charges, pension, acquisition and divestiture related fees, and an expense for the modification of outstanding equity awards.

The change in income before income taxes in Semiconductor Test, System Test, Wireless Test, and Robotics were driven primarily by fluctuations in revenue within each of the businesses. The gain before income taxes in Corporate and Eliminations was primarily due to the sale of DIS to Technoprobe.

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Income Taxes

The effective tax rate for the nine months ended September 29, 2024, and October 1, 2023, was 12.0% and 14.0%, respectively. The decrease in the effective tax rate from the nine months ended October 1, 2023, to the nine months ended September 29, 2024, primarily resulted from the benefit of a projected shift in the geographic distribution of income and an increase in benefit related to reserves for uncertain tax positions. These benefits were partially offset by decreases in benefits related to tax credits and the international provision of the U.S. Tax Cuts and Jobs Act of 2017.

Contractual Obligations

There have been no changes outside of the ordinary course of business to our contractual obligations as disclosed in our Annual Report on Form 10-K for the year ended December 31, 2023.

Liquidity and Capital Resources

Our cash, cash equivalents and marketable securities balances decreased by $259.5 million in the nine months ended September 29, 2024, to $677.6 million.

Operating activities during the nine months ended September 29, 2024, provided cash of $389.6 million. Changes in operating assets and liabilities used cash of $75.8 million due to a $7.3 million decrease in operating assets and a $83.1 million decrease in operating liabilities.

The decrease in operating assets was primarily due to decreases in other assets and inventory of $61.4 million and $11.1 million, respectively, partially offset by a $65.3 million increase in accounts receivable, driven by higher sales in the third quarter.

The decrease in operating liabilities was due to a $32.3 million decrease in accrued employee compensation, $25.9 million decrease in accounts payable, $18.9 million decrease in income taxes, $4.2 million decrease in retirement plans, and $5.5 million decrease in accrued other, partially offset by a $3.6 million increase in deferred revenue and customer advances.

Investing activities during the nine months ended September 29, 2024, used cash of $554.9 million due to $527.1 million used for the purchases of investment, $140.7 million used for the purchase of property, plant and equipment, $35.1 million used for the purchase of marketable securities, partially offset by $90.3 million in proceeds from the sale of a business, $23.6 million and $33.2 million in proceeds from the sales and maturities and marketable securities, respectively, and $0.9 million in proceeds from life insurance.

Financing activities during the nine months ended September 29, 2024, used cash of $88.6 million due to $185.0 million used for proceeds from borrowings on revolving credit facility of which $185.0 million in payments were paid back in full during the quarter, $56.9 million used for dividend payment, $55.1 million used for the repurchase of 0.5 million shares of common stock at an average price of $111.32 per share and $13.8 million used for payment related to net settlements of employee stock compensation awards, partially offset by $37.3 million from the issuance of common stock under employee stock purchase and stock option plans.

Operating activities during the nine months ended October 1, 2023, provided cash of $336.5 million. Changes in operating assets and liabilities used cash of $119.3 million due to a $27.4 million increase in operating assets and $91.9 million decrease in operating liabilities.

The increase in operating assets was primarily due to a $64.0 million increase in prepayments and other assets due to prepayments to our contract manufacturers, partially offset by a $30.2 million decrease in accounts receivable and a $6.4 million decrease in inventories.

The decrease in operating liabilities was due to a $56.6 million decrease in accrued employee compensation, a $49.5 million decrease in deferred revenue and customer advance payments, a $42.7 million decrease in income taxes, and $3.7 million of retirement plan contributions, partially offset by $36.0 million increase in accounts payable and an $24.5 million increase in other accrued liabilities.

Investing activities during the nine months ended October 1, 2023, used cash of $149.2 million due to $137.8 million used for purchases of marketable securities and $115.3 million used for purchases of property, plant and equipment, and $5.0 million used for issuance of convertible loan, partially offset by $37.0 million and $71.4 million in proceeds from sales and maturities of marketable securities, respectively, and $0.5 million in proceeds from the cancellation of Teradyne owned life insurance policies related to the cash surrender value.

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Financing activities during the nine months ended October 1, 2023, used cash of $410.8 million due to $346.5 million used for the repurchase of 3.4 million shares of common stock at an average price of $103.89 per share, $51.1 million used for dividend payments, and $26.7 million used for payments of convertible debt principal, and $20.6 million used for payment related to net settlements of employee stock compensation awards, partially offset by $34.1 million from the issuance of common stock under employee stock purchase and stock option plans.

In January 2024, May 2024, and August 2024, our Board of Directors declared a quarterly cash dividend of $0.12 per share. Dividend payments for the three and nine months ended September 29, 2024, were $19.6 million and $57.0 million, respectively.

In January 2023, May 2023, and August 2023, our Board of Directors declared a quarterly cash dividend of $0.11 per share. Dividend payments for the three and nine months ended October 1, 2023, were $16.9 million and $51.1 million, respectively.

In January 2023, our Board of Directors cancelled the 2021 repurchase program and approved a new repurchase program for up to $2.0 billion of common stock.

During the nine months ended September 29, 2024, we repurchased 0.5 million shares of common stock for $55.1 million, which excludes related excise tax, at an average price of $111.32 per share. In 2024, Teradyne intends, based on market conditions, to repurchase its common stock in an amount necessary to offset dilution from equity compensation and our employee share purchase program. The cumulative repurchases under the 2023 repurchase program as of September 29, 2024, were 4.4 million shares of common stock for $455.6 million, which excludes related excise tax, at an average price per share of $103.46. During the nine months ended October 1, 2023, we repurchased 3.4 million shares of common stock for $346.5 million, which excludes related excise tax, at an average price of $103.89 per share.

While we have previously declared a quarterly cash dividend and authorized a share repurchase program, we may reduce or eliminate the cash dividend or share repurchase program in the future. Cash dividends and stock repurchases are subject to the discretion of our Board of Directors, which will consider, among other things, our earnings, capital requirements and financial condition.

On May 1, 2020, we entered into a credit agreement providing a three-year, senior secured revolving credit facility of $400.0 million. On December 10, 2021, the credit agreement was amended to extend the senior secured revolving credit facility to December 10, 2026. On October 5, 2022, the credit agreement was amended to increase the amount of the credit facility to $750.0 million from $400.0 million. On November 7, 2023, the Credit Agreement was amended to allow for the purchase of the shares of Technoprobe. On May 16, 2024, we borrowed $185.0 million under the credit agreement to fund the acquisition of 10% of the issued and outstanding shares of Technoprobe. We fully repaid our borrowings on the revolving credit facility prior to September 29, 2024. As of November 1, 2024, there are no outstanding borrowings under the credit facility.

We believe our cash, cash equivalents, marketable securities and senior secured revolving credit facility will be sufficient to pay our quarterly dividend and meet our working capital and expenditure needs for at least the next twelve months. Inflation has not had a significant long-term impact on earnings.

Equity Compensation Plans

In addition to our 1996 Employee Stock Purchase Program as discussed in Note Q: “Stock-Based Compensation” in our 2023 Annual Report on Form 10-K, we have a 2006 Equity and Cash Compensation Incentive Plan (the “2006 Equity Plan”).

The purpose of the 1996 Employee Stock Purchase Plan is to encourage stock ownership by all eligible employees of Teradyne. The purpose of the 2006 Equity Plan is to provide equity ownership and compensation opportunities in Teradyne to our employees, officers and directors. Both plans were approved by our shareholders.

Recently Issued Accounting Pronouncements

In November 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") No. 2023-07, "Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures", which will require us to disclose significant segment expenses and other segment items used by the Chief Operating Decision Maker ("CODM") on an annual and interim basis as well as provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually. Additionally, we will be required to disclose the title and position of the CODM. The new standard is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. This ASU will have no impact on our results of operations, cash flows or financial condition.

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Upon adoption, we will apply the amendments in this ASU retrospectively to all prior period disclosures presented in the financial statements.

In December 2023, FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures”, which requires expanded disclosures relating to the tax rate reconciliation, income taxes paid, income (loss) before income tax expense (benefit) and income tax expense (benefit), requiring a greater disaggregation of information for each. The provisions of ASU 2023-09 are effective for fiscal years beginning after December 15, 2024. The amendments in this update should be applied on a prospective basis, but retrospective application is permitted. This ASU will have no impact on results of operations, cash flows or financial condition.

Item 3: Quantitative and Qualitative Disclosures about Market Risks

For “Quantitative and Qualitative Disclosures about Market Risk” affecting Teradyne, see Part 2 Item 7A, “Quantitative and Qualitative Disclosures about Market Risks,” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, filed with the SEC on February 22, 2024. There were no material changes in our exposure to market risk from those set forth in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023.

Item 4: Controls and Procedures

As of the end of the period covered by this report, our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures pursuant to Rule 13a-15(b) or Rule 15d-15(f) promulgated under the Exchange Act. Based upon that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that, as of the end of the period covered by this report, our disclosure controls and procedures were effective in ensuring that material information required to be disclosed in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, including ensuring that such material information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

There have been no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the three months ended September 29, 2024, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1: Legal Proceedings

We are subject to various legal proceedings and claims which have arisen in the ordinary course of business such as, but not limited to, patent, employment, commercial and environmental matters. Teradyne believes that it has meritorious defenses against all pending claims and intends to vigorously contest them. While it is not possible to predict or determine the outcomes of any pending claims or to provide possible ranges of losses that may arise, Teradyne believes the potential losses associated with all of these actions are unlikely to have a material adverse effect on its business, financial position or results of operations.

Item 1A: Risk Factors

In addition to other information set forth in this Form 10-Q, including the risk discussed below, you should carefully consider the factors discussed in Part I, “Item 1A: Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2023, filed with the SEC on February 22, 2024, which could materially affect our business, financial condition or future results. The risk factors described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, remain applicable to our business.

The risks described in our Annual Report on Form 10-K are not the only risks that we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/or operating results.

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Item 2: Unregistered Sales of Equity Securities and Use of Proceeds

In January 2023, Teradyne’s Board of Directors cancelled our 2021 repurchase program and approved a new repurchase program for up to $2.0 billion of common stock. During the nine months ended September 29, 2024, we repurchased 0.5 million shares of common stock for a total cost of $55.1 million at an average price of $111.32 per share. We record share repurchases at cost, which includes broker commissions and related excise taxes. During the nine months ended October 1, 2023, we repurchased 3.4 million shares of common stock for $349.3 million at an average price of $103.89 per share.

The following table includes information with respect to repurchases we made of our common stock during the three months ended September 29, 2024, (in thousands except per share price):

Period	Total Number of Shares (or Units) Purchased			Average Price Paid per Share (or Unit)			Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs		Maximum Number (or Approximate Dollar Value) of Shares (or Units) that may Yet Be Purchased Under the Plans or Programs (2)
July 1, 2024 - July 28, 2024		3		$	132.08			2	$	1,568,943
July 29, 2024 - August 25, 2024		80		$	120.83			79	$	1,559,411
August 26, 2024 - September 29, 2024		116		$	130.29			115	$	1,544,379
		199	(1)		126.49	(1)		196

(1)Includes approximately three thousand shares at an average price of $130.03 withheld from employees for the payment of taxes.

(2)As of January 1, 2023, share repurchases net of share issuances are subject to a 1% excise tax under the Inflation Reduction Act. Excise tax incurred is included as part of the cost basis of shares repurchased in the Condensed Consolidated Statements of Convertible Common Shares and Stockholders’ Equity.

We satisfy U.S. federal and state minimum withholding tax obligations due upon the vesting and the conversion of restricted stock units into shares of our common stock, by automatically withholding from the shares being issued, a number of shares with an aggregate fair market value on the date of such vesting and conversion that would satisfy the minimum withholding amount due.

Item 4: Mine Safety Disclosures

Not Applicable

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Item 5: Other Information

10b 5-1 Trading Plans

Our officers (as defined in Rule 16a-1(f) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) (“Section 16 Officers”) and directors from time to time enter into contracts, instructions or written plans for the purchase or sale of our securities that are intended to satisfy the conditions specified in Rule 10b5-1(c) under the Exchange Act for an affirmative defense against liability for trading in securities on the basis of material nonpublic information. We refer to these contracts, instructions, and written plans as “Rule 10b5-1 trading plans” and each one as a “Rule 10b5-1 trading plan.” During our fiscal quarter ended September 29, 2024, the following Section 16 Officers or directors adopted, modified or terminated Rule 10b5-1 trading plans:

Ryan Driscoll, Vice President, General Counsel, and Secretary

Ryan Driscoll, our Vice President, General Counsel, and Secretary, entered into a new Rule 10b5-1 trading plan on August 8, 2024. The Rule 10b5-1 trading plan provides that Mr. Driscoll, acting through a broker, may sell up to an aggregate of 365 shares plus (1) fifty percent of the total number of shares received after shares are withheld to pay income taxes upon the vesting of 327 restricted stock units on January 27, 2025, (2) fifty percent of the total number of shares received after shares are withheld to pay income taxes upon the vesting of 234 restricted stock units on January 28, 2025, (3) fifty percent of the total number of shares after shares are withheld to pay income taxes received upon the vesting of 221 restricted stock units on January 29, 2025, and (4) fifty percent of the total number of shares received after shares are withheld to pay income taxes upon the vesting of 630 restricted stock units on February 1, 2025. Subject to price limits, the first trade under Mr. Driscoll’s Rule 10b5-1 trading plan is scheduled for January 27, 2025. Mr. Driscoll’s plan is scheduled to terminate on August 1, 2025, subject to earlier termination upon the sale of all shares subject to the plan, upon termination by Mr. Driscoll or the broker, or as otherwise provided in the plan.

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Item 6: Exhibits

Exhibit Number	Description
10.1	Executive Officer Change in Control Agreement dated November 14, 2023 between Teradyne, Inc. and John Wood * (filed herewith)
10.2	Executive Officer Change in Control Agreement dated August 23, 2024 between Teradyne, Inc. and John Lukez * (filed herewith)
31.1	Certification of Principal Executive Officer, pursuant to Rule 13a-14(a) of Securities and Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith)
31.2	Certification of Principal Financial Officer, pursuant to Rule 13a-14(a) of Securities and Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith)
32.1	Certification of Principal Executive Officer pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith)
32.2	Certification of Principal Financial Officer pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith)
101.INS	Inline XBRL Instance Document
101.SCH	Inline XBRL Taxonomy Extension Schema With Embedded Linkbase Documents
104	Cover Page Interactive Data File (formatted as Inline XBRL, and contained in Exhibit 101)
*	Management Contract or Compensatory Plan

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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.

TERADYNE, INC.

Registrant

/s/ SANJAY MEHTA

Sanjay Mehta

Vice President,

Chief Financial Officer and Treasurer

(Duly Authorized Officer

and Principal Financial Officer)

November 1, 2024

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EX-10.1

Exhibit 10.1

EXECUTIVE OFFICER CHANGE IN CONTROL AGREEMENT

EXECUTIVE OFFICER CHANGE IN CONTROL AGREEMENT entered into this 14th day of November, 2023, by and between Teradyne, Inc. (including its subsidiaries, “Teradyne”), and the undersigned executive officer (“Employee”).

WITNESSETH:

WHEREAS, Teradyne and Employee desire to set forth certain terms and conditions relating to the termination of Employee’s employment upon the occurrence of a Change in Control (as hereinafter defined) of Teradyne.

NOW THEREFORE, in consideration of the premises and of the mutual covenants and agreements hereinafter set forth, the parties hereto hereby agree as follows:

1. Entitlements Upon a Termination Event. If, within twenty-four (24) months following a Change in Control or in contemplation of a Change in Control, there is a Termination Event, and subject to the conditions set forth herein and the performance by Employee of the undertakings and duties set forth herein, Employee shall be entitled to the rights, payments and other benefits set forth below:

(a) Treatment of Awards. Equity Awards that are not subject to Performance Criteria shall be governed by Section 1(b) below, and Cash Awards and Equity Awards that are subject to Performance Criteria shall be governed by Section 1(c) below. The parties hereto acknowledge that, except as otherwise provided herein, the terms of this Agreement are intended to modify the terms of Employee’s existing Cash Award and Equity Award agreements and to be a supplement to Cash Award and Equity Award agreements granted on or subsequent to the date hereof.

(b) Acceleration of Equity Awards. All of Employee’s unvested or unexercisable Equity Awards or Equity Awards subject to restrictions on transfer imposed by Teradyne or repurchase rights in favor of Teradyne, as applicable, granted prior to, on, or after the date hereof (but only (I) such Equity Awards as have been granted to Employee by Teradyne as of the date of the Change in Control or (II) such Equity Awards as have been assumed by an acquiring company at the time of a Change in Control or such new cash and equity awards that have been substituted by an acquiring company for Equity Awards existing at the time of a Change in Control, each pursuant to the terms of any Teradyne incentive plan) shall automatically become fully vested, exercisable or free of restrictions on transfer imposed by Teradyne or repurchase rights in favor of Teradyne, as applicable, as of the date of such Termination Event, and all Equity Awards granted on or after the date hereof shall, to the extent applicable, remain exercisable for the remainder of the generally applicable term of such Equity Award.

(c) Satisfaction of Performance Criteria. All of Employee’s Cash Awards and Equity Awards that are subject to Performance Criteria shall be settled and paid in the following

manner: Employee shall be deemed to have satisfied the necessary percentage of the Performance Criteria to which such Cash Awards and Equity Awards are subject as of the date of the Termination Event, that will provide Employee with the target level of such Cash Awards and Equity Awards; and Employee shall be entitled to receive that portion of each Cash Award and Equity Award payable, at the target level. For purposes of the Cash Awards, the payment shall be multiplied by a fraction, the numerator of which shall be the number of calendar months that have passed during the period in which the Performance Criteria are to be measured (treating the month in which the Termination Event occurs as a full calendar month) and the denominator of which shall be the total number of calendar months in such period. For purposes of this Agreement, “target level” is that percentage of the Performance Criteria established at the beginning of each calendar year in order for the Employee to achieve Model Compensation. Unless otherwise required under Section 1(e) below, such Cash Awards and Equity Awards shall be paid to Employee or the restrictions on transfer removed not later than 10 days following the Termination Event.

(d) Salary Continuation. Unless otherwise required under Section 1 (e) below, Teradyne shall pay Employee monthly an amount equal to 1/12th of Employee’s current annual Model Compensation as of the Termination Event for a period of 24 months following the date of the Termination Event (the “Salary Continuation Period”). In the event a Termination Event constitutes termination for Good Reason on account of a material reduction in Model Compensation, the payment obligation pursuant to this Section 1(d) shall be calculated without giving effect to any such reductions in Model Compensation. All such continued payments shall be made in accordance with Teradyne’s customary pay practices. Subject to Section 1(e)(i) of this Agreement but notwithstanding any other provision of this Agreement to the contrary, the continued payments to Employee contemplated by this Section 1(d) and any benefits provided to Employee that are subject to Section 409A of the Code shall commence on the 60th day following the Termination Event provided Employee has complied with the requirements of Section 1(g) of this Agreement and the release of claims has become irrevocable under applicable law no later than on the 60th day following his Termination Event.

(e) Deferred Compensation/Section 409A.

(i) Notwithstanding any other provision of this Agreement, if the Employee is a “ specified employee” at the time of the Employee’s “separation from service” as defined in Section 409A of the Code , all payments, benefits, or removal of restrictions on the transfer of equity under this Agreement with respect to the Employee’s “separation from service” that constitute compensation deferred under a nonqualified deferred compensation plan as defined in Section 409A of the Code to which such specified employee would otherwise be entitled during the first six months following the date of separation from service shall be made on the first day of the seventh month after the date of separation from service (or, if earlier, the date of death of the Employee).

(ii) For purposes of this Agreement, each amount to be paid or benefit to be provided shall be construed as a separate identified payment for purposes of Section 409A, and any payments that are due within the "short term deferral period" as defined in Section 409A or payments that are made under separation pay plans as described in Treasury Regulation Section 1.409A-1(b)(9)(ii), (iii) or (iv), shall not be treated as deferred compensation unless

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applicable law requires otherwise. Neither Teradyne nor the Employee shall have the right to accelerate or defer the delivery of any payments or benefits under this Agreement except to the extent specifically permitted or required by Section 409A.

(iii) This Agreement is intended to comply with the provisions of Section 409A and the Agreement shall, to the extent practicable, be construed in accordance therewith. Terms defined in the Agreement shall have the meanings given such terms under Section 409A if and to the extent required to comply with Section 409A. In any event, Teradyne makes no representations or warranty and shall have no liability to Employee or any other person if any provisions of or payments under this Agreement are determined to constitute deferred compensation subject to Code Section 409A but not to satisfy the conditions of that section.

(iv) If any amount is payable under the provisions of paragraph (f), below, as a reimbursement of Employee’s expenses, under the provisions of Section 2 and 13, or any other provision of this Agreement that constitutes a reimbursement of expenses under Section 409A then, notwithstanding the other provisions of this Agreement with respect to the payment of such reimbursement, the following limitations shall apply: (A) the expenses eligible for reimbursement may not affect the expenses eligible for reimbursement in any other taxable year; (B) such reimbursement must be made on or before the last day of the year following the year in which the expenses are incurred; (C) the right to reimbursement is not subject to liquidation or exchange for another benefit; and (D) in connection with reimbursements under Section 13 the period during which such expenses can be incurred extends to the end of the period permitted for such claims under the applicable statute of limitations.

(f) Benefit Continuation. During the Salary Continuation Period, Teradyne shall arrange or provide for continued health, dental and vision insurance plan coverage for the Employee at the same levels of coverage in existence prior to the Termination Event subject to Teradyne and Employee each contributing to the applicable insurance premium payments on the same basis and in the same proportions as in existence at the date of the Termination Event. If the Employee is not eligible for continued health, dental and vision insurance plan coverage for any portion of the twenty-four (24) month period defined herein, Teradyne shall provide or reimburse Employee for comparable individual insurance and, if such provision or reimbursement constitutes taxable income to the Employee, such additional amount as is necessary to place the Employee in substantially the same after tax position as he was while an employee of Teradyne with respect to such insurance plan coverages. All other benefits, including but not limited to flex/vacation time accrual, short and long term disability insurance, life insurance, contributions (including company matches) into savings plan and “savings plan plus”, profit sharing payments and participation in the Employee stock purchase plan shall cease as of the date of the Termination Event.

To the extent that amounts paid by Teradyne to provide the benefits under this paragraph (f) are deemed to be deferred compensation subject to Section 409A, then such payments shall be made monthly and any payment to preserve the Employee’s after tax position shall be made within 60 days after the end of each calendar year in which the taxable provision or reimbursement occurs.

(g) Release. Notwithstanding any other provision of this Agreement to the contrary, no payment, benefit or removal of restriction on the transfer of equity provided for under or by virtue of the provisions of this Agreement shall be paid or otherwise made available unless Teradyne shall have first received from Employee a valid, binding and irrevocable general

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release, in the form of Attachment A to this Agreement within twenty-one (21) days of the date of the Termination Event. Employee shall sign such release within twenty-one (21) days of a Termination Event subsequent to a Change in Control. Teradyne agrees to provide Employee an estimate relating to payments to be made under this Agreement upon Employee’s written request. All rights, benefits, payments and other entitlements contemplated to be provided or paid to Employee under this Agreement shall be forfeited as of the 60th day following Employee’s Termination Event if Employee has not provided Teradyne with a valid, irrevocable release of claims as of such 60th day.

(h) Certain Definitions. For purposes of this Agreement, the following terms shall have the following meanings:

“Cash Awards” shall mean any cash-based bonus, cash incentive or other cash awards provided by Teradyne to Employee pursuant to incentive plans that Teradyne maintains, including but not limited to its 2006 Equity and Cash Compensation Incentive Plan.

“Cause” shall mean conduct involving one or more of the following: (i) the substantial and continuing failure of Employee, after notice thereof, to render services to Teradyne in accordance with the terms or requirements of his or her employment as established by the Teradyne Board of Directors from time to time and communicated to the Employee; (ii) Employee’s disloyalty, gross negligence, willful misconduct, dishonesty, fraud or breach of fiduciary duty to Teradyne, each in connection with Employee’s employment by Teradyne; (iii) Employee’s deliberate disregard of the rules or policies of, or breach of an agreement with, Teradyne which results in direct or indirect material loss, damage or injury to Teradyne; (iv) the intentional unauthorized disclosure by Employee of any trade secret or confidential information of Teradyne; (v) the commission by Employee of an act which constitutes unfair competition with Teradyne; or (vi) the conviction of, or the entry of a plea of guilty or nolo contendere by the Employee, to any crime involving moral turpitude or any felony. In the event that Teradyne determines that Cause may exist pursuant to clauses (i), (iii) and (v) above, Teradyne shall give Employee written notice of the facts constituting such Cause and Employee shall have 30 days following receipt of such notice to remedy such Cause.

A “Change in Control” shall be deemed to have occurred upon the occurrence of any of the following events: (i) any consolidation, cash tender offer, reorganization, recapitalization, merger or plan of share exchange following which the capital stock of Teradyne outstanding immediately prior to such transaction constitutes less than a majority of the combined voting power of the then-outstanding securities of the combined corporation or person immediately after such transaction; (ii) any sale, lease, exchange or other transfer of all or substantially all of Teradyne’s assets; (iii) the adoption by the Board of Directors of Teradyne of any plan or proposal for the liquidation or dissolution of Teradyne; (iv) a change in the majority of the Board of Directors of Teradyne through one or more contested elections occurring within a three-year period; or (v) any person (as that term is used in Section 13(d)(3) or Section 14(d)(2) of the Securities Exchange Act of 1934, as amended) becomes beneficial owner of 30% or more of the combined voting power of Teradyne’s outstanding voting securities, other than (A) as a result of a consolidation, reorganization, recapitalization, merger or plan of share exchange following which the capital stock of Teradyne outstanding immediately prior to such transaction constitutes at least a majority of combined voting power of the then-outstanding securities of the

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combined corporation or person immediately after such transaction, (B) by any trustee or other fiduciary holding securities under an employee benefit plan of Teradyne, or (C) by a person temporarily acquiring beneficial ownership in its capacity as an underwriter (as defined pursuant to Section 2(a)(11) of the Securities Act of 1933, as amended) in connection with a public offering of Teradyne securities.

“Equity Awards” shall mean the equity ownership, participation or appreciation opportunities provided by Teradyne to Employee pursuant to incentive plans that Teradyne maintains, including but not limited to its 2006 Equity and Cash Compensation Incentive Plan, the Teradyne, Inc. 1991 Employee Stock Option Plan and the Teradyne, Inc. 1997 Employee Stock Option Plan, and any stock options, restricted stock units, restricted stock, stock appreciation rights, phantom stock and other stock-based awards granted thereunder.

“Good Reason” shall mean any one or more of the following: (i) any material reduction of Employee’s responsibilities (other than for Cause or as a result of death or disability) as they shall exist on the date of the consummation of the Change in Control; (ii) any material reduction in Employee’s Model Compensation as in effect on the date of the consummation of the Change in Control, or as the same may be increased from time to time, or any failure by Teradyne to pay to Employee any bonus accrued, but not yet paid, upon written notice by Employee to Teradyne, within 45 days; (iii) a material reduction in the value of Employee’s benefit package from the value of Employee’s benefit package on the date of the consummation of the Change in Control; or (iv) a requirement that Employee be based at an office that is greater than 50 miles from the location of Employee’s office immediately prior to the Change in Control except for required travel on Teradyne’s business to an extent substantially consistent with the business travel obligations which Employee undertook on behalf of Teradyne prior to the date of the consummation of the Change in Control. In the event of a Termination Event in contemplation of a Change in Control, the applicable baseline measurement date shall be six months prior to such Termination Event and not the date of the consummation of the Change in Control.

“Model Compensation” shall mean Employee’s annual “Model Compensation” as determined by Teradyne’s Compensation Committee or Board of Directors, which consists of (i) a fixed annual salary and (ii) a target annual variable amount.

“Performance Criteria” shall have the meaning ascribed to that term in the Teradyne, Inc. 2006 Equity and Cash Compensation Incentive Plan.

“Termination Event” shall mean (i) any termination of Employee by Teradyne without Cause or (ii) any voluntary termination by Employee for Good Reason; provided, that it shall not be a Termination Event merely because Employee ceases to be employed by Teradyne and becomes employed by a successor to Teradyne involved in the Change in Control that assumes or is otherwise bound by this Agreement as provided in Section 7(a). It is expressly understood that no Termination Event shall be deemed to have occurred merely because, upon the occurrence of a Change in Control, Employee ceases to be employed by Teradyne and does not become employed by a successor to Teradyne after the Change in Control if the successor

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makes an offer to employ Employee on terms and conditions which, if imposed by Teradyne, would not give Employee a basis on which to terminate employment for Good Reason.

(i) Termination in Contemplation of a Change in Control. For purposes of this Agreement, including without limitation, this Section 1, a Termination Event occurring “in contemplation of a Change in Control” means a Termination Event occurring within 3 months prior to an actual Change in Control at the request or direction of a person who enters or has entered into an agreement the consummation of which would cause a Change in Control or who conditions the entry into such an agreement on the Employee’s termination whether or not such person actually enters into such an agreement. A termination by the Employee for Good Reason shall constitute a Termination Event in contemplation of a Change in Control if the actions constituting Good Reason were taken at the request or direction of a person who has entered into an agreement the consummation of which would cause a Change in Control.

2. Reduction of Payments

(a) Notwithstanding any other provision of this Agreement, in the event that the Company undergoes a Change in Ownership or Control (as defined below), the Company shall not be obligated to provide to the Executive a portion of any “Contingent Compensation Payments” (as defined below) that the Executive would otherwise be entitled to receive to the extent necessary to eliminate any “excess parachute payments” (as defined in Section 280G(b)(1) of the Internal Revenue Code of 1986, as amended (the “Code”)) for the Executive. For purposes of this Section 2, the Contingent Compensation Payments so eliminated shall be referred to as the “Eliminated Payments” and the aggregate amount (determined in accordance with Treasury Regulation Section 1.280G-1, Q/A-30 or any successor provision) of the Contingent Compensation Payments so eliminated shall be referred to as the “Eliminated Amount.”

(b) For purposes of this Section 2, the following terms shall have the following respective meanings:

(i) “Change in Ownership or Control” shall mean a change in the ownership or effective control of the Company or in the ownership of a substantial portion of the assets of the Company determined in accordance with Section 280G(b)(2) of the Code.

(ii) “Contingent Compensation Payment” shall mean any payment (or benefit) in the nature of compensation that is made or made available (under this Agreement or otherwise) to a “disqualified individual” (as defined in Section 280G(c) of the Code) and that is contingent (within the meaning of Section 280G (b)(2)(A)(i) of the Code) on a Change in Ownership or Control of the Company.

(c) If and to the extent that any Contingent Compensation Payments are required to be treated as Eliminated Payments pursuant to this Section 2, then the Payments shall be reduced or eliminated, as determined by the Company, in the following order (i) any cash payments, (ii) any taxable benefits, (iii) any nontaxable benefits and (iv) any vesting of equity

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awards, in each case in reverse order beginning with the payments or benefits that are to be paid the farthest in time from the date that triggers the applicability of the excise tax, to the extent necessary to maximize the Eliminated Payments.

3. (a) Non-Competition and Non-Solicitation. From the Termination Event through the end of the Salary Continuation Period, Employee shall not directly or indirectly:

(i)Engage in any business or enterprise (whether as an owner, partner, officer, employee, director, investor, lender, consultant, independent contractor or otherwise, except as the holder of not more than 1% of the combined voting power of the outstanding stock of a publicly held company) that is competitive with Teradyne (including but not limited to, any business or enterprise that develops, designs, produces, markets, sells or renders any product or service competitive with any product or service developed, produced, marketed, sold or rendered by Teradyne while Employee was employed by Teradyne);

(ii)Either alone or in association with others, recruit, solicit, hire or engage as an independent contractor, any person who was employed by Teradyne at any time during the period of Employee's employment with Teradyne, except for an individual whose employment with Teradyne has been terminated for a period of six months or longer; and

(iii)Either alone or in association with others, solicit, divert or take away, or attempt to divert or to take away, the business or patronage of any client or customer or entity that was a prospective client or customer of Teradyne during the Employee's employment.

(b) If any restriction set forth in this Section 3 is found by any court of competent jurisdiction to be unenforceable because it extends for too long a period of time or over too great a range of activities or in too broad a geographic area, it shall be interpreted to extend only over the maximum period of time, range of activities or geographic area as to which it may be enforceable.

(c) Employee acknowledges that the restrictions contained in this Section 3 are necessary for the protection of the business and goodwill of Teradyne and are considered by Employee to be reasonable for such purpose. Employee agrees that any breach of this Section 3 will cause Teradyne irreparable harm and therefore, in the event of any such breach, in addition to such other remedies that may be available, Teradyne shall have the right to seek equitable and/or injunctive relief.

(d) The geographic scope of this Section 3 shall extend to anywhere Teradyne or any of its subsidiaries is doing business, has done business or has plans to do business.

(e) Employee agrees that during the Salary Continuation Period, he will make reasonable good faith efforts to give verbal notice to Teradyne of each new business

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activity he plans to undertake, at least (5) business days prior to beginning any such activity.

(f) If Employee violates the provisions of this Section 3, Teradyne shall be entitled to suspend and recoup any salary continuation payment made per Section 1 (d) above and Employee shall continue to be bound by the restrictions set forth in this Section 3 for an additional period of time equal to the duration of the violation, such additional period not to exceed 24 months.

3A. No Obligation of Employment. Employee understands that the employment relationship between Employee and Teradyne will be “at will” and Employee understands that, prior to any Change in Control, Teradyne may terminate Employee with or without “Cause” at any time, including in contemplation of a Change in Control. Following any Change in Control, Teradyne may also terminate Employee with or without “cause” at any time subject to Employee’s rights and Teradyne’s obligations specified in this Agreement.

4. Governing Law. This Agreement shall be governed by and construed in accordance with the internal laws of the Commonwealth of Massachusetts and this Agreement shall be deemed to be performable in Massachusetts.

5. Severability. In case any one or more of the provisions contained in this Agreement for any reason shall be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provision of this Agreement and this Agreement shall be construed to the maximum extent permitted by law.

6. Waivers and Modifications. This Agreement may be modified, and the rights, remedies and obligations contained in any provision hereof may be waived, only in accordance with this Section 6. No waiver by either party of any breach by the other or any provision hereof shall be deemed to be a waiver of any later or other breach thereof or as a waiver of any other provision of this Agreement. This Agreement may not be waived, changed, discharged or terminated orally or by any course of dealing between the parties, but only by an instrument in writing signed by the party against whom any waiver, change, discharge or termination is sought.

7. Assignment. (a) Teradyne shall require any successor (whether direct or indirect, by purchase, merger, consolidation or otherwise) to all or substantially all of the business or assets of Teradyne expressly to assume and agree to perform under the terms of this Agreement in the same manner and to the same extent that Teradyne and its subsidiaries would be required to perform it if no such succession had taken place (provided that such a requirement to perform which arises by operation of law shall be deemed to satisfy the requirements for such an express assumption and agreement), and in such event Teradyne (as constituted prior to such succession) shall have no further obligation under or with respect to this Agreement. Failure of Teradyne to obtain such assumption and agreement with respect to Employee prior to the effectiveness of any such succession shall be a breach of the terms of this Agreement with respect to Employee and shall entitle Employee to compensation from Teradyne (as constituted prior to such succession) in the same amount and on the same terms as Employee would be entitled to hereunder were Employee’s employment terminated for Good Reason following a

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Change in Control, except that for purposes of implementing the foregoing, the date on which any such succession becomes effective shall be deemed the date of the Termination Event. As used in this Agreement, “Teradyne” shall mean Teradyne as hereinbefore defined and any successor to its business or assets as aforesaid which assumes and agrees (or is otherwise required) to perform this Agreement. Nothing in this Section 7(a) shall be deemed to cause any event or condition which would otherwise constitute a Change in Control not to constitute a Change in Control.

(b) Notwithstanding Section 7(a), Teradyne shall remain liable to Employee upon a Termination Event after a Change in Control if Employee is not offered continuing employment by a successor to Teradyne or is offered continuing employment by a successor to Teradyne only on a basis which would constitute Good Reason for termination of employment hereunder.

(c) This Agreement, and Employee’s and Teradyne’s rights and obligations hereunder, may not be assigned by Employee or, except as provided in Section 7(a), Teradyne, respectively; any purported assignment by Employee or Teradyne in violation hereof shall be null and void.

(d) The terms of this Agreement shall inure to the benefit of and be enforceable by the personal or legal representatives, executors, administrators, permitted successors, heirs, distributees, devisees and legatees of Employee. If Employee shall die while an amount would still be payable to Employee hereunder if they had continued to live, all such amounts, unless otherwise provided herein, shall be paid in accordance with the terms of this Agreement to Employee’s devisee, legatee or other designee or, if there is no such designee, Employee’s estate.

8. Entire Agreement. This Agreement constitutes the entire understanding of the parties relating to the subject matter hereof and supersedes and cancels all agreements, written or oral, made prior to the date hereof between Employee and Teradyne relating to the subject matter hereof; provided, however, that Employee’s existing Cash Award and Equity Award agreements, as modified hereby, shall remain in effect. This Agreement shall not limit any right of Employee to receive any payments or benefits under an employee benefit or Employee compensation plan of Teradyne, initially adopted as of or after the date hereof, which are expressly contingent thereunder upon the occurrence of a Change in Control (including, but not limited to, the acceleration of any rights or benefits thereunder); provided that in no event shall Employee be entitled to any payment or benefit under this Agreement which duplicates a payment or benefit received or receivable by Employee under any severance or similar plan or policy of Teradyne, and in any such case Employee shall only be entitled to receive the greater of the two payments.

9. Notices. All notices hereunder shall be in writing and shall be delivered in person or mailed by certified or registered mail, return receipt requested, addressed as follows:

If to Teradyne, to: Teradyne, Inc.

600 Riverpark Drive
MS NR600-2-2 (Legal Department)

North Reading, MA 01864

Attention: General Counsel

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If to Employee, at Employee’s address in his employment file on record with the Human Resources Department.

10. Counterparts. This Agreement may be executed in two or more counterparts, each of which shall be deemed to be an original, but all of which together shall constitute one and the same instrument.

11. Section Headings. The descriptive section headings herein have been inserted for convenience only and shall not be deemed to define, limit, or otherwise affect the construction of any provision hereof.

12. Term. The term of this Agreement (the “Term”) shall commence upon the Effective Date hereof and terminate upon the earlier of (i) twenty-four (24) months following any Change in Control of Teradyne, (ii) the date prior to any Change in Control of Teradyne that employee for any reason ceases to be an employee of Teradyne (other than a Termination Event in contemplation of a Change in Control)and (iii) the date following any Change in Control of Teradyne that Employee is terminated for Cause or voluntary terminates his employment (other than for Good Reason).

13. Expenses. All reasonable legal fees and expenses incurred in a legal proceeding by Employee in seeking to obtain or enforce any right or benefit provided by this Agreement against a successor to Teradyne shall be the responsibility of and paid for by the successor to Teradyne (but not Teradyne as constituted prior to such succession). Such payments are to be made within twenty (20) days after Employee’s request for payment accompanied with such evidence of fees and expenses incurred as Teradyne’s successor reasonably may require; provided that if Employee institutes a proceeding and the judge or other decision-maker presiding over the proceeding affirmatively finds that Employee has failed to prevail substantially, Employee shall pay Employee’s own costs and expenses (and, if applicable, return any amounts theretofore paid on Employee's behalf under this Section 13).

14. Payments. Any payments hereunder shall be made out of the general assets of Teradyne. The Employee shall have the status of general unsecured creditor of Teradyne, and this Agreement constitutes a mere promise by Teradyne to make payments under this Agreement in the future as and to the extent provided herein. Unless otherwise determined by Teradyne in an applicable plan or arrangement, no amounts payable hereunder upon a Termination Event shall be deemed salary or compensation for the purpose of computing benefits under any employee benefit plan or other arrangement of Teradyne for the benefit of its employees. Teradyne shall be entitled to withhold from any payments or deemed payments any amount of tax withholding required by law.

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IN WITNESS WHEREOF, the parties have executed this Agreement as of the day and year first above written.

TERADYNE, INC.

By: /s/ Charles Gray

Name: Charles Gray

Title: Vice President, General Counsel and Secretary

EMPLOYEE

/s/ John Wood

Name: John Wood

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ATTACHMENT A

Release Agreement

In consideration of the payments and benefits described in the Executive Officer Change in Control Agreement dated August 23, 2024, between me and Teradyne, Inc. (including its subsidiaries, the “Company”), all of which I acknowledge I would not otherwise be entitled to receive, I hereby fully, forever, irrevocably and unconditionally release, remise and discharge the Company, its successors and assigns and their respective officers, directors, stockholders, corporate affiliates, subsidiaries, parent companies, agents and employees (each in their individual and corporate capacities) (hereinafter, the “Released Parties”) from any and all claims, charges, complaints, demands, actions, causes of action, suits, rights, debts, sums of money, costs, accounts, reckonings, covenants, contracts, agreements, promises, doings, omissions, damages, executions, obligations, liabilities, and expenses (including attorneys’ fees and costs), of every kind and nature which I ever had or now have against the Released Parties arising out of my employment with and/or termination or separation from the Company or relating to my relationship as an officer or in any other capacity for the Company, including, but not limited to, all employment discrimination claims under Title VII of the Civil Rights Act of 1964, 42 U.S.C. § 2000e et seq., the Age Discrimination in Employment Act, 29 U.S.C. § 621 et seq., the Americans With Disabilities Act of 1990, 42 U.S.C. § 12101 etseq., the Family and Medical Leave Act, 29 U.S.C. § 2601 etseq., and the Worker Adjustment and Retraining Notification Act (“WARN”), 29 U.S.C. § 2101 etseq., all as amended, the Employee Retirement Income Security Act of 1974 (“ERISA”), 29 U.S.C. § 1001 etseq., the Massachusetts Wage Payment Statute, G.L. c. 149, § 148 et seq., the Massachusetts Sexual Harassment Statute, G.L. c. 214 § 1C, the Massachusetts Consumer Protection Act, G.L. c. 93A, the Massachusetts Equal Rights Act, G.L. c. 93, the Massachusetts Fair Employment Practices Act, M.G.L. c. 151B, § 1 et seq., the Massachusetts Civil Rights Act, M.G.L. c. 12, §§ 11H and 11I, the Massachusetts Equal Rights Act, M.G.L. c. 93, § 102 and M.G.L. c. 214, § 1C, the Massachusetts Labor and Industries Act, M.G.L. c. 149, § 1 etseq., the Massachusetts Privacy Act, M.G.L. c. 214, § 1B, and the Massachusetts Maternity Leave Act , M.G.L. c. 149, § 105D, all as amended; all common law claims including, but not limited to, actions in tort, defamation and breach of contract; all claims to any non-vested ownership interest in the Company, contractual or otherwise, including but not limited to claims to stock or stock options; and any claim or damage arising out of my employment with, termination or separation from the Company (including a claim for retaliation) under any common law theory or any federal, state or local statute or ordinance not expressly referenced above; provided, however, that notwithstanding the foregoing, the Company agrees and hereby acknowledges that this Release Agreement is not intended to and does not (i) apply to any claims Executive may bring to enforce the terms of the Executive Officer Change in Control Agreement, (ii) release the Company of any obligation it may have pursuant to a written agreement, the Company’s articles of organization or bylaws, or as mandated by statute to indemnify me as an officer of the Company; and (iii) release the Company of any obligation to provide and/or pay benefits to me or my estate, conservator or designated beneficiary(ies) under and in accordance with the terms of any applicable Company benefit plan and/or program; provided further, that nothing in this Release Agreement prevents me from filing, cooperating with, or participating in any proceeding before the EEOC or a state Fair Employment Practices Agency (except that I acknowledge that I may not be able to recover any monetary benefits in connection with any such claim, charge or proceeding).

Waiver of Rights and Claims Under the Age Discrimination in Employment Act of 1967: Since I am 40 years of age or older, I have been informed that I have or may have specific rights and/or claims under the Age Discrimination in Employment Act of 1967 (ADEA) and I agree that:

in consideration for the payments and benefits described in the Executive Officer Change in Control Agreement, which I am not otherwise entitled to receive, I specifically and voluntarily

waive such rights and/or claims under the ADEA I might have against the Released Parties to the extent such rights and/or claims arose prior to the date this Release Agreement was executed;

I understand that rights or claims under the ADEA which may arise after the date this Release Agreement is executed are not waived by me;

I was advised that I have at least 21 days within which to consider the terms of this Release Agreement and to consult with or seek advice from an attorney of my choice or any other person of your choosing prior to executing this Release Agreement;

I have carefully read and fully understand all of the provisions of this Release Agreement, and I knowingly and voluntarily agree to all of the terms set forth in this Release Agreement; and in entering into this Release Agreement I am not relying on any representation, promise or inducement made by the Company or its attorneys with the exception of those promises described in this document.

Period for Review and Consideration of Agreement:

I acknowledge that I was informed and understand that I have twenty-one (21) days to review this Release Agreement and consider its terms before signing it.

The 21-day review period will not be affected or extended by any revisions, whether material or immaterial, that might be made to this Agreement.

Accord and Satisfaction: The amounts set forth in the Executive Officer Change in Control Agreement shall be complete and unconditional payment, settlement, accord and/or satisfaction with respect to all obligations and liabilities of the Released Parties to me, including, without limitation, all claims for back wages, salary, vacation pay, draws, incentive pay, bonuses, cash awards, equity awards, commissions, severance pay, reimbursement of expenses, any and all other forms of compensation or benefits, attorney’s fees, or other costs or sums.

Revocation Period: I may revoke this Release Agreement at any time during the seven-day period immediately following my execution hereof. As a result, this Release Agreement shall not become effective or enforceable and the Company shall have no obligation to make any payments or provide any benefits described in the Executive Officer Change in Control Agreement until the seven-day revocation period has expired.

_______________________________________ Name: John Wood	_________________________ Date
________________________________________ Witness	_________________________ Date

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IF YOU DO NOT WISH TO USE THE 21-DAY PERIOD,
PLEASE CAREFULLY REVIEW AND SIGN THIS DOCUMENT

I, John Wood, acknowledge that I was informed and understand that I have 21 days within which to consider the attached Release Agreement, have been advised of my right to consult with an attorney regarding such Agreement and have considered carefully every provision of the Agreement, and that after having engaged in those actions, I prefer to and have requested that I enter into the Agreement prior to the expiration of the 21 day period.

_______________________________________ Name: John Wood	_________________________ Date
________________________________________ Witness	_________________________ Date

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EX-10.2

Exhibit 10.2

EXECUTIVE OFFICER CHANGE IN CONTROL AGREEMENT

EXECUTIVE OFFICER CHANGE IN CONTROL AGREEMENT entered into this 23rd day of August, 2024, by and between Teradyne, Inc. (including its subsidiaries, “Teradyne”), and the undersigned executive officer (“Employee”).

WITNESSETH:

WHEREAS, Teradyne and Employee desire to set forth certain terms and conditions relating to the termination of Employee’s employment upon the occurrence of a Change in Control (as hereinafter defined) of Teradyne.

NOW THEREFORE, in consideration of the premises and of the mutual covenants and agreements hereinafter set forth, the parties hereto hereby agree as follows:

1. Entitlements Upon a Termination Event. If, within twenty-four (24) months following a Change in Control or in contemplation of a Change in Control, there is a Termination Event, and subject to the conditions set forth herein and the performance by Employee of the undertakings and duties set forth herein, Employee shall be entitled to the rights, payments and other benefits set forth below:

(a) Treatment of Awards. Equity Awards that are not subject to Performance Criteria shall be governed by Section 1(b) below, and Cash Awards and Equity Awards that are subject to Performance Criteria shall be governed by Section 1(c) below. The parties hereto acknowledge that, except as otherwise provided herein, the terms of this Agreement are intended to modify the terms of Employee’s existing Cash Award and Equity Award agreements and to be a supplement to Cash Award and Equity Award agreements granted on or subsequent to the date hereof.

(b) Acceleration of Equity Awards. All of Employee’s unvested or unexercisable Equity Awards or Equity Awards subject to restrictions on transfer imposed by Teradyne or repurchase rights in favor of Teradyne, as applicable, granted prior to, on, or after the date hereof (but only (I) such Equity Awards as have been granted to Employee by Teradyne as of the date of the Change in Control or (II) such Equity Awards as have been assumed by an acquiring company at the time of a Change in Control or such new cash and equity awards that have been substituted by an acquiring company for Equity Awards existing at the time of a Change in Control, each pursuant to the terms of any Teradyne incentive plan) shall automatically become fully vested, exercisable or free of restrictions on transfer imposed by Teradyne or repurchase rights in favor of Teradyne, as applicable, as of the date of such Termination Event, and all Equity Awards granted on or after the date hereof shall, to the extent applicable, remain exercisable for the remainder of the generally applicable term of such Equity Award.

(c) Satisfaction of Performance Criteria. All of Employee’s Cash Awards and Equity Awards that are subject to Performance Criteria shall be settled and paid in the following

manner: Employee shall be deemed to have satisfied the necessary percentage of the Performance Criteria to which such Cash Awards and Equity Awards are subject as of the date of the Termination Event, that will provide Employee with the target level of such Cash Awards and Equity Awards; and Employee shall be entitled to receive that portion of each Cash Award and Equity Award payable, at the target level. For purposes of the Cash Awards, the payment shall be multiplied by a fraction, the numerator of which shall be the number of calendar months that have passed during the period in which the Performance Criteria are to be measured (treating the month in which the Termination Event occurs as a full calendar month) and the denominator of which shall be the total number of calendar months in such period. For purposes of this Agreement, “target level” is that percentage of the Performance Criteria established at the beginning of each calendar year in order for the Employee to achieve Model Compensation. Unless otherwise required under Section 1(e) below, such Cash Awards and Equity Awards shall be paid to Employee or the restrictions on transfer removed not later than 10 days following the Termination Event.

(d) Salary Continuation. Unless otherwise required under Section 1 (e) below, Teradyne shall pay Employee monthly an amount equal to 1/12th of Employee’s current annual Model Compensation as of the Termination Event for a period of 24 months following the date of the Termination Event (the “Salary Continuation Period”). In the event a Termination Event constitutes termination for Good Reason on account of a material reduction in Model Compensation, the payment obligation pursuant to this Section 1(d) shall be calculated without giving effect to any such reductions in Model Compensation. All such continued payments shall be made in accordance with Teradyne’s customary pay practices. Subject to Section 1(e)(i) of this Agreement but notwithstanding any other provision of this Agreement to the contrary, the continued payments to Employee contemplated by this Section 1(d) and any benefits provided to Employee that are subject to Section 409A of the Code shall commence on the 60th day following the Termination Event provided Employee has complied with the requirements of Section 1(g) of this Agreement and the release of claims has become irrevocable under applicable law no later than on the 60th day following his Termination Event.

(e) Deferred Compensation/Section 409A.

(i) Notwithstanding any other provision of this Agreement, if the Employee is a “ specified employee” at the time of the Employee’s “separation from service” as defined in Section 409A of the Code , all payments, benefits, or removal of restrictions on the transfer of equity under this Agreement with respect to the Employee’s “separation from service” that constitute compensation deferred under a nonqualified deferred compensation plan as defined in Section 409A of the Code to which such specified employee would otherwise be entitled during the first six months following the date of separation from service shall be made on the first day of the seventh month after the date of separation from service (or, if earlier, the date of death of the Employee).

(ii) For purposes of this Agreement, each amount to be paid or benefit to be provided shall be construed as a separate identified payment for purposes of Section 409A, and any payments that are due within the "short term deferral period" as defined in Section 409A or payments that are made under separation pay plans as described in Treasury Regulation Section 1.409A-1(b)(9)(ii), (iii) or (iv), shall not be treated as deferred compensation unless

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applicable law requires otherwise. Neither Teradyne nor the Employee shall have the right to accelerate or defer the delivery of any payments or benefits under this Agreement except to the extent specifically permitted or required by Section 409A.

(iii) This Agreement is intended to comply with the provisions of Section 409A and the Agreement shall, to the extent practicable, be construed in accordance therewith. Terms defined in the Agreement shall have the meanings given such terms under Section 409A if and to the extent required to comply with Section 409A. In any event, Teradyne makes no representations or warranty and shall have no liability to Employee or any other person if any provisions of or payments under this Agreement are determined to constitute deferred compensation subject to Code Section 409A but not to satisfy the conditions of that section.

(iv) If any amount is payable under the provisions of paragraph (f), below, as a reimbursement of Employee’s expenses, under the provisions of Section 2 and 13, or any other provision of this Agreement that constitutes a reimbursement of expenses under Section 409A then, notwithstanding the other provisions of this Agreement with respect to the payment of such reimbursement, the following limitations shall apply: (A) the expenses eligible for reimbursement may not affect the expenses eligible for reimbursement in any other taxable year; (B) such reimbursement must be made on or before the last day of the year following the year in which the expenses are incurred; (C) the right to reimbursement is not subject to liquidation or exchange for another benefit; and (D) in connection with reimbursements under Section 13 the period during which such expenses can be incurred extends to the end of the period permitted for such claims under the applicable statute of limitations.

(f) Benefit Continuation. During the Salary Continuation Period, Teradyne shall arrange or provide for continued health, dental and vision insurance plan coverage for the Employee at the same levels of coverage in existence prior to the Termination Event subject to Teradyne and Employee each contributing to the applicable insurance premium payments on the same basis and in the same proportions as in existence at the date of the Termination Event. If the Employee is not eligible for continued health, dental and vision insurance plan coverage for any portion of the twenty-four (24) month period defined herein, Teradyne shall provide or reimburse Employee for comparable individual insurance and, if such provision or reimbursement constitutes taxable income to the Employee, such additional amount as is necessary to place the Employee in substantially the same after tax position as he was while an employee of Teradyne with respect to such insurance plan coverages. All other benefits, including but not limited to flex/vacation time accrual, short and long term disability insurance, life insurance, contributions (including company matches) into savings plan and “savings plan plus”, profit sharing payments and participation in the Employee stock purchase plan shall cease as of the date of the Termination Event.

To the extent that amounts paid by Teradyne to provide the benefits under this paragraph (f) are deemed to be deferred compensation subject to Section 409A, then such payments shall be made monthly and any payment to preserve the Employee’s after tax position shall be made within 60 days after the end of each calendar year in which the taxable provision or reimbursement occurs.

(g) Release. Notwithstanding any other provision of this Agreement to the contrary, no payment, benefit or removal of restriction on the transfer of equity provided for under or by virtue of the provisions of this Agreement shall be paid or otherwise made available unless Teradyne shall have first received from Employee a valid, binding and irrevocable general

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release, in the form of Attachment A to this Agreement within twenty-one (21) days of the date of the Termination Event. Employee shall sign such release within twenty-one (21) days of a Termination Event subsequent to a Change in Control. Teradyne agrees to provide Employee an estimate relating to payments to be made under this Agreement upon Employee’s written request. All rights, benefits, payments and other entitlements contemplated to be provided or paid to Employee under this Agreement shall be forfeited as of the 60th day following Employee’s Termination Event if Employee has not provided Teradyne with a valid, irrevocable release of claims as of such 60th day.

(h) Certain Definitions. For purposes of this Agreement, the following terms shall have the following meanings:

“Cash Awards” shall mean any cash-based bonus, cash incentive or other cash awards provided by Teradyne to Employee pursuant to incentive plans that Teradyne maintains, including but not limited to its 2006 Equity and Cash Compensation Incentive Plan.

“Cause” shall mean conduct involving one or more of the following: (i) the substantial and continuing failure of Employee, after notice thereof, to render services to Teradyne in accordance with the terms or requirements of his or her employment as established by the Teradyne Board of Directors from time to time and communicated to the Employee; (ii) Employee’s disloyalty, gross negligence, willful misconduct, dishonesty, fraud or breach of fiduciary duty to Teradyne, each in connection with Employee’s employment by Teradyne; (iii) Employee’s deliberate disregard of the rules or policies of, or breach of an agreement with, Teradyne which results in direct or indirect material loss, damage or injury to Teradyne; (iv) the intentional unauthorized disclosure by Employee of any trade secret or confidential information of Teradyne; (v) the commission by Employee of an act which constitutes unfair competition with Teradyne; or (vi) the conviction of, or the entry of a plea of guilty or nolo contendere by the Employee, to any crime involving moral turpitude or any felony. In the event that Teradyne determines that Cause may exist pursuant to clauses (i), (iii) and (v) above, Teradyne shall give Employee written notice of the facts constituting such Cause and Employee shall have 30 days following receipt of such notice to remedy such Cause.

A “Change in Control” shall be deemed to have occurred upon the occurrence of any of the following events: (i) any consolidation, cash tender offer, reorganization, recapitalization, merger or plan of share exchange following which the capital stock of Teradyne outstanding immediately prior to such transaction constitutes less than a majority of the combined voting power of the then-outstanding securities of the combined corporation or person immediately after such transaction; (ii) any sale, lease, exchange or other transfer of all or substantially all of Teradyne’s assets; (iii) the adoption by the Board of Directors of Teradyne of any plan or proposal for the liquidation or dissolution of Teradyne; (iv) a change in the majority of the Board of Directors of Teradyne through one or more contested elections occurring within a three-year period; or (v) any person (as that term is used in Section 13(d)(3) or Section 14(d)(2) of the Securities Exchange Act of 1934, as amended) becomes beneficial owner of 30% or more of the combined voting power of Teradyne’s outstanding voting securities, other than (A) as a result of a consolidation, reorganization, recapitalization, merger or plan of share exchange following which the capital stock of Teradyne outstanding immediately prior to such transaction constitutes at least a majority of combined voting power of the then-outstanding securities of the

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combined corporation or person immediately after such transaction, (B) by any trustee or other fiduciary holding securities under an employee benefit plan of Teradyne, or (C) by a person temporarily acquiring beneficial ownership in its capacity as an underwriter (as defined pursuant to Section 2(a)(11) of the Securities Act of 1933, as amended) in connection with a public offering of Teradyne securities.

“Equity Awards” shall mean the equity ownership, participation or appreciation opportunities provided by Teradyne to Employee pursuant to incentive plans that Teradyne maintains, including but not limited to its 2006 Equity and Cash Compensation Incentive Plan, the Teradyne, Inc. 1991 Employee Stock Option Plan and the Teradyne, Inc. 1997 Employee Stock Option Plan, and any stock options, restricted stock units, restricted stock, stock appreciation rights, phantom stock and other stock-based awards granted thereunder.

“Good Reason” shall mean any one or more of the following: (i) any material reduction of Employee’s responsibilities (other than for Cause or as a result of death or disability) as they shall exist on the date of the consummation of the Change in Control; (ii) any material reduction in Employee’s Model Compensation as in effect on the date of the consummation of the Change in Control, or as the same may be increased from time to time, or any failure by Teradyne to pay to Employee any bonus accrued, but not yet paid, upon written notice by Employee to Teradyne, within 45 days; (iii) a material reduction in the value of Employee’s benefit package from the value of Employee’s benefit package on the date of the consummation of the Change in Control; or (iv) a requirement that Employee be based at an office that is greater than 50 miles from the location of Employee’s office immediately prior to the Change in Control except for required travel on Teradyne’s business to an extent substantially consistent with the business travel obligations which Employee undertook on behalf of Teradyne prior to the date of the consummation of the Change in Control. In the event of a Termination Event in contemplation of a Change in Control, the applicable baseline measurement date shall be six months prior to such Termination Event and not the date of the consummation of the Change in Control.

“Model Compensation” shall mean Employee’s annual “Model Compensation” as determined by Teradyne’s Compensation Committee or Board of Directors, which consists of (i) a fixed annual salary and (ii) a target annual variable amount.

“Performance Criteria” shall have the meaning ascribed to that term in the Teradyne, Inc. 2006 Equity and Cash Compensation Incentive Plan.

“Termination Event” shall mean (i) any termination of Employee by Teradyne without Cause or (ii) any voluntary termination by Employee for Good Reason; provided, that it shall not be a Termination Event merely because Employee ceases to be employed by Teradyne and becomes employed by a successor to Teradyne involved in the Change in Control that assumes or is otherwise bound by this Agreement as provided in Section 7(a). It is expressly understood that no Termination Event shall be deemed to have occurred merely because, upon the occurrence of a Change in Control, Employee ceases to be employed by Teradyne and does not become employed by a successor to Teradyne after the Change in Control if the successor

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makes an offer to employ Employee on terms and conditions which, if imposed by Teradyne, would not give Employee a basis on which to terminate employment for Good Reason.

(i) Termination in Contemplation of a Change in Control. For purposes of this Agreement, including without limitation, this Section 1, a Termination Event occurring “in contemplation of a Change in Control” means a Termination Event occurring within 3 months prior to an actual Change in Control at the request or direction of a person who enters or has entered into an agreement the consummation of which would cause a Change in Control or who conditions the entry into such an agreement on the Employee’s termination whether or not such person actually enters into such an agreement. A termination by the Employee for Good Reason shall constitute a Termination Event in contemplation of a Change in Control if the actions constituting Good Reason were taken at the request or direction of a person who has entered into an agreement the consummation of which would cause a Change in Control.

2. Reduction of Payments

(a) Notwithstanding any other provision of this Agreement, in the event that the Company undergoes a Change in Ownership or Control (as defined below), the Company shall not be obligated to provide to the Executive a portion of any “Contingent Compensation Payments” (as defined below) that the Executive would otherwise be entitled to receive to the extent necessary to eliminate any “excess parachute payments” (as defined in Section 280G(b)(1) of the Internal Revenue Code of 1986, as amended (the “Code”)) for the Executive. For purposes of this Section 2, the Contingent Compensation Payments so eliminated shall be referred to as the “Eliminated Payments” and the aggregate amount (determined in accordance with Treasury Regulation Section 1.280G-1, Q/A-30 or any successor provision) of the Contingent Compensation Payments so eliminated shall be referred to as the “Eliminated Amount.”

(b) For purposes of this Section 2, the following terms shall have the following respective meanings:

(i) “Change in Ownership or Control” shall mean a change in the ownership or effective control of the Company or in the ownership of a substantial portion of the assets of the Company determined in accordance with Section 280G(b)(2) of the Code.

(ii) “Contingent Compensation Payment” shall mean any payment (or benefit) in the nature of compensation that is made or made available (under this Agreement or otherwise) to a “disqualified individual” (as defined in Section 280G(c) of the Code) and that is contingent (within the meaning of Section 280G (b)(2)(A)(i) of the Code) on a Change in Ownership or Control of the Company.

(c) If and to the extent that any Contingent Compensation Payments are required to be treated as Eliminated Payments pursuant to this Section 2, then the Payments shall be reduced or eliminated, as determined by the Company, in the following order (i) any cash payments, (ii) any taxable benefits, (iii) any nontaxable benefits and (iv) any vesting of equity

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awards, in each case in reverse order beginning with the payments or benefits that are to be paid the farthest in time from the date that triggers the applicability of the excise tax, to the extent necessary to maximize the Eliminated Payments.

3. (a) Non-Competition and Non-Solicitation. From the Termination Event through the end of the Salary Continuation Period, Employee shall not directly or indirectly:

(i)Engage in any business or enterprise (whether as an owner, partner, officer, employee, director, investor, lender, consultant, independent contractor or otherwise, except as the holder of not more than 1% of the combined voting power of the outstanding stock of a publicly held company) that is competitive with Teradyne (including but not limited to, any business or enterprise that develops, designs, produces, markets, sells or renders any product or service competitive with any product or service developed, produced, marketed, sold or rendered by Teradyne while Employee was employed by Teradyne);

(ii)Either alone or in association with others, recruit, solicit, hire or engage as an independent contractor, any person who was employed by Teradyne at any time during the period of Employee's employment with Teradyne, except for an individual whose employment with Teradyne has been terminated for a period of six months or longer; and

(iii)Either alone or in association with others, solicit, divert or take away, or attempt to divert or to take away, the business or patronage of any client or customer or entity that was a prospective client or customer of Teradyne during the Employee's employment.

(b) If any restriction set forth in this Section 3 is found by any court of competent jurisdiction to be unenforceable because it extends for too long a period of time or over too great a range of activities or in too broad a geographic area, it shall be interpreted to extend only over the maximum period of time, range of activities or geographic area as to which it may be enforceable.

(c) Employee acknowledges that the restrictions contained in this Section 3 are necessary for the protection of the business and goodwill of Teradyne and are considered by Employee to be reasonable for such purpose. Employee agrees that any breach of this Section 3 will cause Teradyne irreparable harm and therefore, in the event of any such breach, in addition to such other remedies that may be available, Teradyne shall have the right to seek equitable and/or injunctive relief.

(d) The geographic scope of this Section 3 shall extend to anywhere Teradyne or any of its subsidiaries is doing business, has done business or has plans to do business.

(e) Employee agrees that during the Salary Continuation Period, he will make reasonable good faith efforts to give verbal notice to Teradyne of each new business

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activity he plans to undertake, at least (5) business days prior to beginning any such activity.

(f) If Employee violates the provisions of this Section 3, Teradyne shall be entitled to suspend and recoup any salary continuation payment made per Section 1 (d) above and Employee shall continue to be bound by the restrictions set forth in this Section 3 for an additional period of time equal to the duration of the violation, such additional period not to exceed 24 months.

3A. No Obligation of Employment. Employee understands that the employment relationship between Employee and Teradyne will be “at will” and Employee understands that, prior to any Change in Control, Teradyne may terminate Employee with or without “Cause” at any time, including in contemplation of a Change in Control. Following any Change in Control, Teradyne may also terminate Employee with or without “cause” at any time subject to Employee’s rights and Teradyne’s obligations specified in this Agreement.

4. Governing Law. This Agreement shall be governed by and construed in accordance with the internal laws of the Commonwealth of Massachusetts and this Agreement shall be deemed to be performable in Massachusetts.

5. Severability. In case any one or more of the provisions contained in this Agreement for any reason shall be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provision of this Agreement and this Agreement shall be construed to the maximum extent permitted by law.

6. Waivers and Modifications. This Agreement may be modified, and the rights, remedies and obligations contained in any provision hereof may be waived, only in accordance with this Section 6. No waiver by either party of any breach by the other or any provision hereof shall be deemed to be a waiver of any later or other breach thereof or as a waiver of any other provision of this Agreement. This Agreement may not be waived, changed, discharged or terminated orally or by any course of dealing between the parties, but only by an instrument in writing signed by the party against whom any waiver, change, discharge or termination is sought.

7. Assignment. (a) Teradyne shall require any successor (whether direct or indirect, by purchase, merger, consolidation or otherwise) to all or substantially all of the business or assets of Teradyne expressly to assume and agree to perform under the terms of this Agreement in the same manner and to the same extent that Teradyne and its subsidiaries would be required to perform it if no such succession had taken place (provided that such a requirement to perform which arises by operation of law shall be deemed to satisfy the requirements for such an express assumption and agreement), and in such event Teradyne (as constituted prior to such succession) shall have no further obligation under or with respect to this Agreement. Failure of Teradyne to obtain such assumption and agreement with respect to Employee prior to the effectiveness of any such succession shall be a breach of the terms of this Agreement with respect to Employee and shall entitle Employee to compensation from Teradyne (as constituted prior to such succession) in the same amount and on the same terms as Employee would be entitled to hereunder were Employee’s employment terminated for Good Reason following a

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Change in Control, except that for purposes of implementing the foregoing, the date on which any such succession becomes effective shall be deemed the date of the Termination Event. As used in this Agreement, “Teradyne” shall mean Teradyne as hereinbefore defined and any successor to its business or assets as aforesaid which assumes and agrees (or is otherwise required) to perform this Agreement. Nothing in this Section 7(a) shall be deemed to cause any event or condition which would otherwise constitute a Change in Control not to constitute a Change in Control.

(b) Notwithstanding Section 7(a), Teradyne shall remain liable to Employee upon a Termination Event after a Change in Control if Employee is not offered continuing employment by a successor to Teradyne or is offered continuing employment by a successor to Teradyne only on a basis which would constitute Good Reason for termination of employment hereunder.

(c) This Agreement, and Employee’s and Teradyne’s rights and obligations hereunder, may not be assigned by Employee or, except as provided in Section 7(a), Teradyne, respectively; any purported assignment by Employee or Teradyne in violation hereof shall be null and void.

(d) The terms of this Agreement shall inure to the benefit of and be enforceable by the personal or legal representatives, executors, administrators, permitted successors, heirs, distributees, devisees and legatees of Employee. If Employee shall die while an amount would still be payable to Employee hereunder if they had continued to live, all such amounts, unless otherwise provided herein, shall be paid in accordance with the terms of this Agreement to Employee’s devisee, legatee or other designee or, if there is no such designee, Employee’s estate.

8. Entire Agreement. This Agreement constitutes the entire understanding of the parties relating to the subject matter hereof and supersedes and cancels all agreements, written or oral, made prior to the date hereof between Employee and Teradyne relating to the subject matter hereof; provided, however, that Employee’s existing Cash Award and Equity Award agreements, as modified hereby, shall remain in effect. This Agreement shall not limit any right of Employee to receive any payments or benefits under an employee benefit or Employee compensation plan of Teradyne, initially adopted as of or after the date hereof, which are expressly contingent thereunder upon the occurrence of a Change in Control (including, but not limited to, the acceleration of any rights or benefits thereunder); provided that in no event shall Employee be entitled to any payment or benefit under this Agreement which duplicates a payment or benefit received or receivable by Employee under any severance or similar plan or policy of Teradyne, and in any such case Employee shall only be entitled to receive the greater of the two payments.

9. Notices. All notices hereunder shall be in writing and shall be delivered in person or mailed by certified or registered mail, return receipt requested, addressed as follows:

If to Teradyne, to: Teradyne, Inc.

600 Riverpark Drive
MS NR600-2-2 (Legal Department)

North Reading, MA 01864

Attention: General Counsel

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If to Employee, at Employee’s address in his employment file on record with the Human Resources Department.

10. Counterparts. This Agreement may be executed in two or more counterparts, each of which shall be deemed to be an original, but all of which together shall constitute one and the same instrument.

11. Section Headings. The descriptive section headings herein have been inserted for convenience only and shall not be deemed to define, limit, or otherwise affect the construction of any provision hereof.

12. Term. The term of this Agreement (the “Term”) shall commence upon the Effective Date hereof and terminate upon the earlier of (i) twenty-four (24) months following any Change in Control of Teradyne, (ii) the date prior to any Change in Control of Teradyne that employee for any reason ceases to be an employee of Teradyne (other than a Termination Event in contemplation of a Change in Control)and (iii) the date following any Change in Control of Teradyne that Employee is terminated for Cause or voluntary terminates his employment (other than for Good Reason).

13. Expenses. All reasonable legal fees and expenses incurred in a legal proceeding by Employee in seeking to obtain or enforce any right or benefit provided by this Agreement against a successor to Teradyne shall be the responsibility of and paid for by the successor to Teradyne (but not Teradyne as constituted prior to such succession). Such payments are to be made within twenty (20) days after Employee’s request for payment accompanied with such evidence of fees and expenses incurred as Teradyne’s successor reasonably may require; provided that if Employee institutes a proceeding and the judge or other decision-maker presiding over the proceeding affirmatively finds that Employee has failed to prevail substantially, Employee shall pay Employee’s own costs and expenses (and, if applicable, return any amounts theretofore paid on Employee's behalf under this Section 13).

14. Payments. Any payments hereunder shall be made out of the general assets of Teradyne. The Employee shall have the status of general unsecured creditor of Teradyne, and this Agreement constitutes a mere promise by Teradyne to make payments under this Agreement in the future as and to the extent provided herein. Unless otherwise determined by Teradyne in an applicable plan or arrangement, no amounts payable hereunder upon a Termination Event shall be deemed salary or compensation for the purpose of computing benefits under any employee benefit plan or other arrangement of Teradyne for the benefit of its employees. Teradyne shall be entitled to withhold from any payments or deemed payments any amount of tax withholding required by law.

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IN WITNESS WHEREOF, the parties have executed this Agreement as of the day and year first above written.

TERADYNE, INC.

By: /s/ Ryan Driscoll

Name: Ryan Driscoll

Title: Vice President, General Counsel and Secretary

EMPLOYEE

/s/ John Lukez

Name: John Lukez

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ATTACHMENT A

Release Agreement

In consideration of the payments and benefits described in the Executive Officer Change in Control Agreement dated August 23, 2024, between me and Teradyne, Inc. (including its subsidiaries, the “Company”), all of which I acknowledge I would not otherwise be entitled to receive, I hereby fully, forever, irrevocably and unconditionally release, remise and discharge the Company, its successors and assigns and their respective officers, directors, stockholders, corporate affiliates, subsidiaries, parent companies, agents and employees (each in their individual and corporate capacities) (hereinafter, the “Released Parties”) from any and all claims, charges, complaints, demands, actions, causes of action, suits, rights, debts, sums of money, costs, accounts, reckonings, covenants, contracts, agreements, promises, doings, omissions, damages, executions, obligations, liabilities, and expenses (including attorneys’ fees and costs), of every kind and nature which I ever had or now have against the Released Parties arising out of my employment with and/or termination or separation from the Company or relating to my relationship as an officer or in any other capacity for the Company, including, but not limited to, all employment discrimination claims under Title VII of the Civil Rights Act of 1964, 42 U.S.C. § 2000e et seq., the Age Discrimination in Employment Act, 29 U.S.C. § 621 et seq., the Americans With Disabilities Act of 1990, 42 U.S.C. § 12101 etseq., the Family and Medical Leave Act, 29 U.S.C. § 2601 etseq., and the Worker Adjustment and Retraining Notification Act (“WARN”), 29 U.S.C. § 2101 etseq., all as amended, the Employee Retirement Income Security Act of 1974 (“ERISA”), 29 U.S.C. § 1001 etseq., the Massachusetts Wage Payment Statute, G.L. c. 149, § 148 et seq., the Massachusetts Sexual Harassment Statute, G.L. c. 214 § 1C, the Massachusetts Consumer Protection Act, G.L. c. 93A, the Massachusetts Equal Rights Act, G.L. c. 93, the Massachusetts Fair Employment Practices Act, M.G.L. c. 151B, § 1 et seq., the Massachusetts Civil Rights Act, M.G.L. c. 12, §§ 11H and 11I, the Massachusetts Equal Rights Act, M.G.L. c. 93, § 102 and M.G.L. c. 214, § 1C, the Massachusetts Labor and Industries Act, M.G.L. c. 149, § 1 etseq., the Massachusetts Privacy Act, M.G.L. c. 214, § 1B, and the Massachusetts Maternity Leave Act , M.G.L. c. 149, § 105D, all as amended; all common law claims including, but not limited to, actions in tort, defamation and breach of contract; all claims to any non-vested ownership interest in the Company, contractual or otherwise, including but not limited to claims to stock or stock options; and any claim or damage arising out of my employment with, termination or separation from the Company (including a claim for retaliation) under any common law theory or any federal, state or local statute or ordinance not expressly referenced above; provided, however, that notwithstanding the foregoing, the Company agrees and hereby acknowledges that this Release Agreement is not intended to and does not (i) apply to any claims Executive may bring to enforce the terms of the Executive Officer Change in Control Agreement, (ii) release the Company of any obligation it may have pursuant to a written agreement, the Company’s articles of organization or bylaws, or as mandated by statute to indemnify me as an officer of the Company; and (iii) release the Company of any obligation to provide and/or pay benefits to me or my estate, conservator or designated beneficiary(ies) under and in accordance with the terms of any applicable Company benefit plan and/or program; provided further, that nothing in this Release Agreement prevents me from filing, cooperating with, or participating in any proceeding before the EEOC or a state Fair Employment Practices Agency (except that I acknowledge that I may not be able to recover any monetary benefits in connection with any such claim, charge or proceeding).

Waiver of Rights and Claims Under the Age Discrimination in Employment Act of 1967: Since I am 40 years of age or older, I have been informed that I have or may have specific rights and/or claims under the Age Discrimination in Employment Act of 1967 (ADEA) and I agree that:

in consideration for the payments and benefits described in the Executive Officer Change in Control Agreement, which I am not otherwise entitled to receive, I specifically and voluntarily

waive such rights and/or claims under the ADEA I might have against the Released Parties to the extent such rights and/or claims arose prior to the date this Release Agreement was executed;

I understand that rights or claims under the ADEA which may arise after the date this Release Agreement is executed are not waived by me;

I was advised that I have at least 21 days within which to consider the terms of this Release Agreement and to consult with or seek advice from an attorney of my choice or any other person of your choosing prior to executing this Release Agreement;

I have carefully read and fully understand all of the provisions of this Release Agreement, and I knowingly and voluntarily agree to all of the terms set forth in this Release Agreement; and in entering into this Release Agreement I am not relying on any representation, promise or inducement made by the Company or its attorneys with the exception of those promises described in this document.

Period for Review and Consideration of Agreement:

I acknowledge that I was informed and understand that I have twenty-one (21) days to review this Release Agreement and consider its terms before signing it.

The 21-day review period will not be affected or extended by any revisions, whether material or immaterial, that might be made to this Agreement.

Accord and Satisfaction: The amounts set forth in the Executive Officer Change in Control Agreement shall be complete and unconditional payment, settlement, accord and/or satisfaction with respect to all obligations and liabilities of the Released Parties to me, including, without limitation, all claims for back wages, salary, vacation pay, draws, incentive pay, bonuses, cash awards, equity awards, commissions, severance pay, reimbursement of expenses, any and all other forms of compensation or benefits, attorney’s fees, or other costs or sums.

Revocation Period: I may revoke this Release Agreement at any time during the seven-day period immediately following my execution hereof. As a result, this Release Agreement shall not become effective or enforceable and the Company shall have no obligation to make any payments or provide any benefits described in the Executive Officer Change in Control Agreement until the seven-day revocation period has expired.

_______________________________________ Name: John Lukez	_________________________ Date
________________________________________ Witness	_________________________ Date

2

IF YOU DO NOT WISH TO USE THE 21-DAY PERIOD,
PLEASE CAREFULLY REVIEW AND SIGN THIS DOCUMENT

I, John Lukez, acknowledge that I was informed and understand that I have 21 days within which to consider the attached Release Agreement, have been advised of my right to consult with an attorney regarding such Agreement and have considered carefully every provision of the Agreement, and that after having engaged in those actions, I prefer to and have requested that I enter into the Agreement prior to the expiration of the 21 day period.

_______________________________________ Name: John Lukez	_________________________ Date
________________________________________ Witness	_________________________ Date

3

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Gregory S. Smith, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Teradyne, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 1, 2024

By:	/s/ GREGORY S. SMITH
	Gregory S. Smith
	Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Sanjay Mehta, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Teradyne, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 1, 2024

By:	/s/ SANJAY MEHTA
	Sanjay Mehta
	Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Teradyne, Inc. (the “Company”) on Form 10-Q for the period ended September 29, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Gregory S. Smith, Chief Executive Officer of the Company, certify pursuant to 18 U.S.C Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Report.

/s/ GREGORY S. SMITH

Gregory S. Smith

Chief Executive Officer

November 1, 2024

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Teradyne, Inc. (the “Company”) on Form 10-Q for the period ended September 29, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Sanjay Mehta, Chief Financial Officer of the Company, certify pursuant to 18 U.S.C Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Report.

/s/ SANJAY MEHTA

Sanjay Mehta

Chief Financial Officer

November 1, 2024

XML

Cover Page - shares	9 Months Ended
	Sep. 29, 2024	Oct. 28, 2024
Cover [Abstract]
Amendment Flag	false
Document Type	10-Q
Document Fiscal Year Focus	2024
Entity Central Index Key	0000097210
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Document Period End Date	Sep. 29, 2024
Entity Registrant Name	TERADYNE, INC.
Entity Filer Category	Large Accelerated Filer
Trading Symbol	TER
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Title of 12(b) Security	Common Stock
Security Exchange Name	NASDAQ
Entity File Number	001-06462
Entity Incorporation, State or Country Code	MA
Entity Tax Identification Number	04-2272148
Entity Address, Address Line One	600 Riverpark Drive
Entity Address, City or Town	North Reading
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01864
City Area Code	978
Local Phone Number	370-2700
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		162,861,462

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Sep. 29, 2024		Dec. 31, 2023
Current assets:
Cash and cash equivalents		$ 510,036		$ 757,571
Marketable securities		41,631		62,154
Accounts receivable, less allowance for credit losses of $1,972 and $1,988 at September 29, 2024 and December 31, 2023, respectively		484,376		422,124
Inventories, net	[1]	297,340		309,974
Prepayments	[2]	489,548		548,970
Other current assets		15,935		37,992
Current assets held for sale		0		23,250
Total current assets		1,838,866		2,162,035
Property, plant and equipment, net		491,704		445,492
Operating lease right-of-use assets, net		70,784		73,417
Marketable securities		125,944		117,434
Deferred tax assets		201,881		175,775
Retirement plans assets		13,114		11,504
Equity method investment		538,351		0
Other assets		48,384		38,580
Acquired intangible assets, net		21,288		35,404
Goodwill		419,412		415,652
Long-term assets held for sale		0		11,531
Total assets		3,769,728	[3]	3,486,824
Current liabilities:
Accounts payable		158,459		180,131
Accrued employees' compensation and withholdings		159,794		191,750
Deferred revenue and customer advances		99,776		99,804
Other accrued liabilities		105,150		114,712
Operating lease liabilities		19,175		17,522
Income taxes payable		52,542		48,653
Current liabilities held for sale		0		7,379
Total current liabilities		594,896		659,951
Retirement plans liabilities		137,735		132,090
Long-term deferred revenue and customer advances		41,135		37,282
Long-term other accrued liabilities		8,373		19,998
Deferred tax liabilities		164		183
Long-term operating lease liabilities		60,287		65,092
Long-term incomes taxes payable		24,596		44,331
Long-term liabilities held for sale		0		2,000
Total liabilities		867,186		960,927
Commitments and contingencies (Note R)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized; 162,959 and 152,698 shares issued and outstanding at September 29, 2024, and December 31, 2023, respectively		20,370		19,087
Additional paid-in capital		1,896,161		1,827,274
Accumulated other comprehensive loss		(4,028)		(26,978)
Retained earnings		990,039		706,514
Total shareholders' equity		2,902,542		2,525,897
Total liabilities and shareholders' equity		$ 3,769,728		$ 3,486,824

[1] Inventories, net at December 31, 2023, exclude $18.0 million of primarily work-in-process inventories, net classified as assets held for sale. See Note E: "Dispositions" for additional information.

[2] Excludes $5.3 million at December 31, 2023, of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: “Dispositions” for additional information.

[3] Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 29, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Accounts receivable, less allowance for doubtful accounts	$ 1,972	$ 1,988
Common stock, par value	$ 0.125	$ 0.125
Common stock, shares authorized	1,000,000	1,000,000
Common stock, shares issued	162,959	152,698
Common stock, shares outstanding	162,959	152,698

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 29, 2024		Oct. 01, 2023		Sep. 29, 2024		Oct. 01, 2023
Revenues:
Total revenues	$ 737,298	[1]	$ 703,732	[1]	$ 2,066,996	[2]	$ 2,005,699	[2]
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)	300,784		305,441		865,357		848,495
Gross profit	436,514		398,291		1,201,639		1,157,204
Operating expenses:
Selling and administrative	157,649		138,330		461,307		434,979
Engineering and development	117,474		104,413		332,489		315,881
Acquired intangible assets amortization	4,748		4,720		14,108		14,348
Restructuring and other	4,578		6,856		11,018		15,251
Gain on sale of business	0		0		(57,486)		0
Total operating expenses	284,449		254,319		761,436		780,459
Income from operations	152,065		143,972		440,203		376,745
Non-operating (income) expense:
Interest income	(5,076)		(6,873)		(19,658)		(18,486)
Interest expense	808		963		2,998		2,994
Other (income) expense, net	(2,651)		5,602		5,574		6,470
Income before income taxes and equity in net earnings of affiliate	158,984		144,280		451,289		385,767
Income tax provision	12,260		16,164		54,095		54,069
Income before equity in net earnings of affiliate	146,724		128,116		397,194		331,698
Equity in net earnings of affiliate	(1,075)				(1,075)
Net income	$ 145,649		$ 128,116		$ 396,119		$ 331,698
Net income per common share:
Basic	$ 0.89		$ 0.83		$ 2.51		$ 2.14
Diluted	$ 0.89		$ 0.78		$ 2.42		$ 2.01
Weighted average common shares—basic	163,002		153,762		157,951		154,809
Weighted average common shares—diluted	164,253		164,050		163,357		165,037
Product [Member]
Revenues:
Total revenues	$ 612,871		$ 551,982		$ 1,668,181		$ 1,565,776
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)	253,129		239,827		704,129		655,502
Service [Member]
Revenues:
Total revenues	124,427		151,750		398,815		439,923
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)	$ 47,655		$ 65,614		$ 161,228		$ 192,993

[1] Includes $0.8 million and $1.4 million in 2024, and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

[2] Includes $2.5 million and $3.9 million in 2024 and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 145,649	$ 128,116	$ 396,119	$ 331,698
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax of $0, $0, $0, and $0, respectively	37,838	(14,325)	22,751	(2,073)
Available-for-sale marketable securities:
Unrealized (losses) gains on marketable securities arising during period, net of tax of $609, $(731), $205, and $(408), respectively	2,507	(2,628)	885	(903)
Less: Reclassification adjustment for (gains) losses included in net income, net of tax of $(2), $0, $24, and $9, respectively	(7)	0	86	33
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total	2,500	(2,628)	971	(870)
Cash flow hedges:
Unrealized (losses) gains arising during period, net of tax of $(73), $728, $285, and $1,816, respectively	(260)	2,590	1,014	6,456
Less: Reclassification adjustment for (gains) losses included in net income, net of tax of $0, $(869), $(500) and $(441) respectively	0	(3,091)	(1,780)	(1,567)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent	(260)	(501)	(766)	4,889
Defined benefit post-retirement plan:
Amortization of prior service credit, net of tax of $0, $0, $(1), and $(1), respectively	(2)	(2)	(6)	(6)
Other comprehensive income (loss)	40,076	(17,456)	22,950	1,940
Comprehensive income	$ 185,725	$ 110,660	$ 419,069	$ 333,638

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, tax	$ 0	$ 0	$ 0	$ 0
Unrealized gains (losses) on marketable securities arising during period, net of tax	609	(731)	205	(408)
Reclassification adjustment for losses (gains) included in net income, net of tax	(2)	0	24	9
Amortization of prior service credit, net of tax	0	0	(1)	(1)
Cash flow hedges Unrealized gains	(73)	728	285	1,816
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	$ 0	$ (869)	$ (500)	$ (441)

XML

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance at Dec. 31, 2022	$ 2,451,294	$ 19,470	$ 1,755,963	$ (49,868)	$ 725,729
Balance, Shares at Dec. 31, 2022		155,759,000
Net issuance of common stock under stock-based plans	13,503	$ 104	13,399
Net issuance of common stock under stock-based plans (in shares)		838,000
Stock-based compensation expense	46,775		46,775
Repurchase of common stock	(352,791)	$ (420)			(352,371)
Repurchase of common stock (in shares)		(3,362,000)
Cash dividends	(51,119)				(51,119)
Settlements of convertible notes		$ 72	(72)
Settlements of convertible notes (in shares)		585,000
Exercise of convertible notes hedge call options		$ (72)	72
Exercise of convertible notes hedge call options (in shares)		(585,000)
Net income	331,698				331,698
Other comprehensive income (loss)	1,940			1,940
Balance at Oct. 01, 2023	2,441,300	$ 19,154	1,816,137	(47,928)	653,937
Balance, Shares at Oct. 01, 2023		153,235,000
Balance at Jul. 02, 2023	2,434,883	$ 19,269	1,784,590	(30,472)	661,496
Balance, Shares at Jul. 02, 2023		154,148,000
Net issuance of common stock under stock-based plans	17,206	$ 26	17,180
Net issuance of common stock under stock-based plans (in shares)		207,000
Stock-based compensation expense	14,367		14,367
Repurchase of common stock	(118,907)	$ (141)			(118,766)
Repurchase of common stock (in shares)		(1,120,000)
Cash dividends	(16,909)				(16,909)
Settlements of convertible notes	0	$ 25	(25)
Settlements of convertible notes (in shares)		210,000
Exercise of convertible notes hedge call options	0	$ (25)	25
Exercise of convertible notes hedge call options (in shares)		(210,000)
Net income	128,116				128,116
Other comprehensive income (loss)	(17,456)			(17,456)
Balance at Oct. 01, 2023	2,441,300	$ 19,154	1,816,137	(47,928)	653,937
Balance, Shares at Oct. 01, 2023		153,235,000
Balance at Dec. 31, 2023	2,525,897	$ 19,087	1,827,274	(26,978)	706,514
Balance, Shares at Dec. 31, 2023		152,698,000
Net issuance of common stock under stock-based plans	23,431	$ 91	23,340
Net issuance of common stock under stock-based plans (in shares)		720,000
Stock-based compensation expense	46,817		46,817
Warrant exercises	(16)	$ 1,254	(1,270)
Warrant exercises (in shares)		10,036,000
Repurchase of common stock	(55,692)	$ (62)			(55,630)
Repurchase of common stock (in shares)		(495,000)
Cash dividends	(56,964)				(56,964)
Net income	396,119				396,119
Other comprehensive income (loss)	22,950			22,950
Balance at Sep. 29, 2024	2,902,542	$ 20,370	1,896,161	(4,028)	990,039
Balance, Shares at Sep. 29, 2024		162,959,000
Balance at Jun. 30, 2024	2,730,812	$ 20,225	1,865,351	(44,104)	889,340
Balance, Shares at Jun. 30, 2024		161,802,000
Net issuance of common stock under stock-based plans	14,983	$ 17	14,966
Net issuance of common stock under stock-based plans (in shares)		130,000
Stock-based compensation expense	15,999		15,999
Warrant exercises	(2)	$ 153	(155)
Warrant exercises (in shares)		1,223,000
Repurchase of common stock	(25,401)	$ (25)			(25,376)
Repurchase of common stock (in shares)		(196,000)
Cash dividends	(19,574)				(19,574)
Net income	145,649				145,649
Other comprehensive income (loss)	40,076			40,076
Balance at Sep. 29, 2024	$ 2,902,542	$ 20,370	$ 1,896,161	$ (4,028)	$ 990,039
Balance, Shares at Sep. 29, 2024		162,959,000

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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.12	$ 0.11	$ 0.36	$ 0.33

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023
Cash flows from operating activities:
Net income	$ 396,119	$ 331,698
Adjustments to reconcile net income from operations to net cash provided by operating activities:
Depreciation	74,480	68,858
Stock-based compensation	45,267	45,236
Provision for excess and obsolete inventory	15,516	23,069
Amortization	14,133	14,083
Losses (gains) on investments	10,139	(3,159)
Equity in net earnings of affiliate	1,075
Gain on sale of business	(57,486)	0
Deferred taxes	(26,261)	(24,026)
Retirement plan actuarial losses (gains)	(2,512)	0
Other	(5,041)	(13)
Changes in operating assets and liabilities
Accounts receivable	(65,266)	30,191
Inventories	11,127	6,395
Prepayments and other assets	61,438	(63,982)
Accounts payable and other liabilities	(63,666)	3,999
Deferred revenue and customer advances	3,624	(49,517)
Retirement plans contributions	(4,169)	(3,698)
Income taxes	(18,898)	(42,683)
Net cash provided by operating activities	389,619	336,451
Cash flows from investing activities:
Purchases of property, plant and equipment	(140,710)	(115,306)
Purchase of investment in a business	(527,060)	0
Purchases of marketable securities	(35,097)	(137,786)
Issuance of convertible loan		(5,000)
Proceeds from the sale of a business, net of cash and cash equivalents sold	90,348	0
Proceeds from maturities of marketable securities	33,163	71,447
Proceeds from sales of marketable securities	23,600	36,963
Proceeds from insurance	873	460
Net cash used for investing activities	(554,883)	(149,222)
Cash flows from financing activities:
Repayments of borrowings on revolving credit facility	(185,000)	0
Dividend payments	(56,936)	(51,081)
Repurchase of common stock	(55,053)	(346,492)
Payments related to net settlement of employee stock compensation awards	(13,833)	(20,586)
Payments of convertible debt principal	0	(26,735)
Proceeds from borrowings on revolving credit facility	185,000	0
Issuance of common stock under stock purchase and stock option plans	37,265	34,084
Net cash used for financing activities	(88,557)	(410,810)
Effects of exchange rate changes on cash and cash equivalents	6,286	5,769
Decrease in cash and cash equivalents	(247,535)	(217,812)
Cash and cash equivalents at beginning of period	757,571	854,773
Cash and cash equivalents at end of period	510,036	636,961
Non-cash investing activities:
Capital expenditures incurred but not yet paid:	$ 3,679	$ 2,392

XML

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 145,649	$ 128,116	$ 396,119	$ 331,698

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Insider Trading Arrangements - Ryan Driscoll	3 Months Ended
	Sep. 29, 2024 shares
Trading Arrangements, by Individual
Name	Ryan Driscoll
Title	Vice President, General Counsel, and Secretary
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	August 8, 2024
Rule 10b5-1 Arrangement Terminated	true
Termination Date	August 1, 2025
Aggregate Available	365

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The Company

9 Months Ended

Sep. 29, 2024

The Company

A. THE COMPANY

Teradyne, Inc. (“Teradyne”) is a leading global supplier of automated test equipment and robotics solutions. Teradyne designs, develops, manufactures, and sells automated test systems and robotics products. Teradyne’s automated test systems are used to test semiconductors, wireless products, data storage and complex electronics systems in many industries including consumer electronics, wireless, automotive, industrial, computing, communications, and aerospace and defense industries. Teradyne’s robotics products include collaborative robotic arms, autonomous mobile robots, and advanced robotic control software used by global manufacturing, logistics and industrial customers to improve quality, increase manufacturing and material handling efficiency, and decrease manufacturing and logistics costs. Teradyne’s automated test equipment and robotics products and services include:

•semiconductor test (“Semiconductor Test”) systems;

•storage and system level test (“Integrated System Test” formerly "Storage Test") systems, defense/aerospace (“Defense/Aerospace”) test instrumentation and systems, and circuit-board test and inspection (“Production Board Test”) systems (collectively these products represent “System Test”);

•wireless test (“Wireless Test”) systems; and

•robotics (“Robotics”) products.

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Accounting Policies

9 Months Ended

Sep. 29, 2024

Accounting Policies

B. ACCOUNTING POLICIES

Basis of Presentation

The consolidated interim financial statements include the accounts of Teradyne and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated. These interim financial statements are unaudited and reflect all normal recurring adjustments that are, in the opinion of management, necessary for the fair statement of such interim financial statements. The December 31, 2023, condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by United States of America generally accepted accounting principles (“U.S. GAAP”) for complete financial statements. The accompanying financial information should be read in conjunction with the consolidated financial statements and notes thereto contained in Teradyne’s Annual Report on Form 10-K, filed with the U.S. Securities and Exchange Commission (“SEC”) on February 22, 2024, for the year ended December 31, 2023.

Preparation of Financial Statements and Use of Estimates

The preparation of consolidated financial statements requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent liabilities. On an on-going basis, management evaluates its estimates, including those related to inventories, investments, goodwill, intangible and other long-lived assets, accounts receivable, income taxes, deferred tax assets and liabilities, pensions, warranties, contingent consideration liabilities, and loss contingencies. Management bases its estimates on historical experience and on appropriate and customary assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Management is not aware of any specific event or circumstance that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities as of the date of issuance of this Quarterly Report on Form 10-Q. These estimates may change, as new events occur, and additional information is obtained. Actual results may differ significantly from these estimates under different assumptions or conditions.

Equity Method Investments

Teradyne accounts for investments using the equity method of accounting when it has significant influence over the financial and operating policies, but not control, of the investee. The equity method investments are initially recorded at cost and included in ‘Equity method investment’ in the consolidated balance sheet. Teradyne records its share of investee's net income or loss and other comprehensive income, and the amortization of equity method basis difference, calculated as the difference between the investment and the amount of underlying equity in net assets acquired, on a 3-month lag, which is applied consistently from period to period. Teradyne's share of investee's net income and the amortization of equity method basis difference are reported in ‘Equity in net earnings of affiliate’ in the consolidated statement of operations. Teradyne includes its share of investee's other comprehensive income

and a cumulative translation adjustment in the consolidated statements of comprehensive income. Teradyne monitors on an ongoing basis its equity method investments for indicators of other-than-temporary declines in fair value below carrying value.

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Recently Issued Accounting Pronouncements

9 Months Ended

Sep. 29, 2024

Recently Issued Accounting Pronouncements

C. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS

In November 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") No. 2023-07, "Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures", which will require Teradyne to disclose significant segment expenses and other segment items used by the Chief Operating Decision Maker ("CODM") on an annual and interim basis as well as provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually. Additionally, Teradyne will be required to disclose the title and position of the CODM. The new standard is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. This ASU will have no impact on results of operations, cash flows or financial condition. Upon adoption, Teradyne will apply the amendments in this ASU retrospectively to all prior period disclosures presented in the financial statements.

In December 2023, FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures”, which requires expanded disclosures relating to the tax rate reconciliation, income taxes paid, income (loss) before income tax expense (benefit) and income tax expense (benefit), requiring a greater disaggregation of information for each. The provisions of ASU 2023-09 are effective for fiscal years beginning after December 15, 2024. The amendments in this update should be applied on a prospective basis, but retrospective application is permitted. This ASU will have no impact on results of operations, cash flows or financial condition.

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Revenue

9 Months Ended

Sep. 29, 2024

Revenue from Contract with Customer [Abstract]

Revenue

D. REVENUE

Disaggregation of Revenue

The following table provides information about disaggregated revenue by timing of revenue recognition, primary geographical market, and major product lines.

		Semiconductor Test				System Test		Robotics				Wireless Test
		System on-a-Chip		Memory				Universal Robots		Mobile Industrial Robots				Total
	(in thousands)
For the Three Months Ended September 29, 2024 (1)
Timing of Revenue Recognition
Point in Time		$	323,507	$	143,581	$	55,611	$	71,607	$	15,065	$	29,465	$	638,836
Over Time			68,848		6,798		17,701		1,811		168		3,136		98,462
Total		$	392,355	$	150,379	$	73,312	$	73,418	$	15,233	$	32,601	$	737,298
Geographical Market
Asia Pacific		$	364,476	$	137,890	$	29,277	$	10,873	$	2,960	$	24,342	$	569,818
Americas			17,150		1,325		39,919		32,315		8,460		5,515		104,684
Europe, Middle East and Africa			10,729		11,164		4,116		30,230		3,813		2,744		62,796
Total		$	392,355	$	150,379	$	73,312	$	73,418	$	15,233	$	32,601	$	737,298
For the Three Months Ended October 1, 2023 (1)
Timing of Revenue Recognition
Point in Time		$	330,846	$	86,247	$	66,418	$	68,938	$	14,012	$	32,638	$	599,099
Over Time			73,264		7,506		16,785		1,607		1,135		4,336		104,633
Total		$	404,110	$	93,753	$	83,203	$	70,545	$	15,147	$	36,974	$	703,732
Geographical Market
Asia Pacific		$	360,375	$	91,352	$	40,464	$	15,430	$	3,180	$	24,727	$	535,528
Americas			24,752		1,356		35,888		26,073		7,154		10,139		105,362
Europe, Middle East and Africa			18,983		1,045		6,851		29,042		4,813		2,108		62,842
Total		$	404,110	$	93,753	$	83,203	$	70,545	$	15,147	$	36,974	$	703,732
For the Nine Months Ended September 29, 2024 (2)
Timing of Revenue Recognition
Point in Time		$	896,635	$	367,679	$	157,203	$	210,222	$	49,850	$	82,652	$	1,764,241
Over Time			211,612		21,626		52,232		5,542		938		10,805		302,755
Total		$	1,108,247	$	389,305	$	209,435	$	215,764	$	50,788	$	93,457	$	2,066,996
Geographical Market
Asia Pacific		$	1,016,674	$	357,993	$	76,317	$	37,254	$	11,361	$	70,776	$	1,570,375
Americas			59,912		13,631		105,197		82,220		28,195		16,240		305,395
Europe, Middle East and Africa			31,661		17,681		27,921		96,290		11,232		6,441		191,226
Total		$	1,108,247	$	389,305	$	209,435	$	215,764	$	50,788	$	93,457	$	2,066,996
For the Nine Months Ended October 1, 2023 (2)
Timing of Revenue Recognition
Point in Time		$	886,201	$	260,052	$	200,076	$	194,698	$	42,748	$	108,262	$	1,692,038
Over Time			219,436		21,890		52,030		5,731		3,364		11,210		313,661
Total		$	1,105,638	$	281,942	$	252,106	$	200,429	$	46,112	$	119,472	$	2,005,699
Geographical Market
Asia Pacific		$	946,696	$	270,297	$	121,698	$	43,530	$	6,973	$	70,320	$	1,459,514
Americas			98,511		8,586		105,031		69,346		25,051		42,476		349,001
Europe, Middle East and Africa			60,431		3,059		25,377		87,553		14,088		6,676		197,184
Total		$	1,105,638	$	281,942	$	252,106	$	200,429	$	46,112	$	119,472	$	2,005,699

(1)Includes $0.8 million and $1.4 million in 2024, and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

(2)Includes $2.5 million and $3.9 million in 2024 and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

Contract Balances

During the three and nine months ended September 29, 2024, Teradyne recognized $13.4 million and $60.2 million, respectively, that was included within the deferred revenue and customer advances balances at the beginning of the period. During the three and nine months ended October 1, 2023, Teradyne recognized $21.9 million and $91.3 million, respectively, that was included within the deferred revenue and customer advances balances at the beginning of the period. This revenue primarily relates to undelivered hardware, extended warranties, training, application support, and post contract support. Each of these represents a distinct performance obligation. As of September 29, 2024, Teradyne had $1,045.4 million of unsatisfied performance obligations. Teradyne expects to recognize approximately 93% of the remaining performance obligations in the next 12 months and the remainder in 1-3 years.

Deferred revenue and customer advances consist of the following and are included in short and long-term deferred revenue and customer advances on the balance sheet:

	September 29, 2024		December 31, 2023
	(in thousands)
Maintenance, service and training	$	57,866	$	66,458
Customer advances, undelivered elements and other		44,116		35,731
Extended warranty		38,929		34,897
Total deferred revenue and customer advances	$	140,911	$	137,086

Accounts Receivable

During the three and nine months ended September 29, 2024, and October 1, 2023, Teradyne sold certain trade accounts receivables on a non-recourse basis to third-party financial institutions pursuant to factoring agreements. During the three months ended September 29, 2024, and October 1, 2023, total trade accounts receivable sold under the factoring agreements were $36.1 million and $94.1 million, respectively. During the nine months ended September 29, 2024, and October 1, 2023, total trade accounts receivable sold under the factoring agreements were $116.8 million and $191.2 million, respectively. Factoring fees for the sales of receivables were recorded in interest expense and were not material. Teradyne accounted for these transactions as sales of receivables and presented cash proceeds as cash provided by operating activities in the consolidated statements of cash flows.

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Dispositions

9 Months Ended

Sep. 29, 2024

Discontinued Operations and Disposal Groups [Abstract]

Dispositions

E. DISPOSITIONS

On May 27, 2024, Teradyne completed the sale of the Device Interface Solutions ("DIS") business, a component of the Semiconductor Test segment, to Technoprobe S.p.A. ("Technoprobe") for $85.0 million in cash, net of cash and cash equivalents sold, and a customary working capital adjustment. The sale resulted in a pre-tax gain of $57.5 million recorded as 'Gain on sale of business' in the consolidated statement of operations. The transaction did not meet the criteria to be classified as a discontinued operation, as it did not represent a strategic shift that will have a major effect on operations and financial results.

Assets and liabilities related to the DIS sale agreement met the criteria and were classified as held for sale in Teradyne’s consolidated balance sheet as of December 31, 2023, as follows:

	December 31, 2023
Current assets:
Inventories, net	$	17,952
Prepayments		5,298
Total current assets held for sale		23,250
Property, plant and equipment, net		8,986
Operating lease right-of-use assets, net		2,545
Total assets held for sale	$	34,781
Current liabilities:
Accounts payable	$	6,356
Other accrued liabilities		552
Operating lease liabilities		471
Total current liabilities held for sale		7,379
Long-term operating lease liabilities		2,000
Total liabilities held for sale	$	9,379
Net assets held for sale	$	25,402

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Equity Method Investment

9 Months Ended

Sep. 29, 2024

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investment

F. EQUITY METHOD INVESTMENT

On May 27, 2024, Teradyne paid $524.1 million to purchase a combination of previously issued and outstanding shares and shares newly issued by Technoprobe, S.p.A. ("Technoprobe"). The shares purchased represent 10% of the issued and outstanding shares of Technoprobe. Teradyne also received a board seat as part of the purchase. Teradyne accounts for this investment using the

equity method as a result of being able to exercise significant influence over the operating and financial decisions of Technoprobe. As of September 29, 2024, $538.4 million was recorded as 'Equity method investment' in the consolidated balance sheets.

	(in thousands)
Balance at June 30, 2024	$	524,060
Other comprehensive income related to investment		15,366
Equity in net earnings of affiliate		(1,075	)
Balance at September 29, 2024	$	538,351

Based on the quoted closing price of Technoprobe stock as of September 29, 2024, the fair value of the publicly traded investment was $471.8 million, and there was no other-than-temporary impairment identified.

Teradyne's equity method basis difference was calculated as the difference between the investment and the amount of underlying equity in net assets acquired. The equity method basis difference calculated at acquisition attributable to developed technology, customer relationships, trade name, property, plant and equipment, inventory, and deferred tax liability was $204.7 million. The basis differences, net of tax, will be amortized over their estimated useful lives.

Teradyne made an accounting policy election to report its share of Technoprobe's results on a 3-month lag, which is applied consistently from period to period. Teradyne records its share of Technoprobe's net income or loss and the amortization of equity method basis difference, as 'Equity in net earnings of affiliate' in the consolidated statements of operations. Teradyne includes its share of Technoprobe's other comprehensive income and a cumulative translation adjustment in the consolidated statements of comprehensive income.

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Inventories

9 Months Ended

Sep. 29, 2024

Inventory Disclosure [Abstract]

Inventories

G. INVENTORIES

Inventories, net consisted of the following at September 29, 2024, and December 31, 2023:

	September 29, 2024		December 31, 2023
	(in thousands)
Raw material	$	216,019	$	258,422
Work-in-process		48,249		26,851
Finished goods		33,072		24,701
Total inventories, net (1)	$	297,340	$	309,974

(1)Inventories, net at December 31, 2023, exclude $18.0 million of primarily work-in-process inventories, net classified as assets held for sale. See Note E: "Dispositions" for additional information.

Inventory reserves at September 29, 2024, and December 31, 2023, were $140.5 million and $136.0 million, respectively.

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Financial Instruments

9 Months Ended

Sep. 29, 2024

Fair Value Disclosures [Abstract]

Financial Instruments

H. FINANCIAL INSTRUMENTS

Cash Equivalents

Teradyne considers all highly liquid investments with original maturities of 90 days or less at the date of acquisition to be cash equivalents.

Marketable Securities

Teradyne’s equity and debt mutual funds are classified as Level 1 and available-for-sale debt securities are classified as Level 2. The vast majority of Level 2 securities are fixed income securities priced by third party pricing vendors. These pricing vendors utilize the most recent observable market information in pricing these securities or, if specific prices are not available, use other observable inputs like market transactions involving identical or comparable securities.

During the three and nine months ended September 29, 2024, and October 1, 2023, there were no transfers in or out of Level 1, Level 2, or Level 3 financial instruments.

Realized gains recorded in the three and nine months ended September 29, 2024, were $0.8 million and $2.1 million, respectively. Realized gains recorded in the three and nine months ended October 1, 2023, were $0.1 million and $0.6 million,

respectively. Realized losses recorded in the three and nine months ended September 29, 2024, were $0.0 million and $0.3 million, respectively. Realized losses recorded in the three and nine months ended October 1, 2023, were $0.0 million and $0.3 million, respectively. Realized gains and losses are included in 'Other (income) expense, net' in the consolidated statement of operations.

Unrealized gains on equity securities recorded in the three and nine months ended September 29, 2024, were $2.2 million and $5.4 million, respectively. Unrealized gains on equity securities recorded in the three and nine months ended October 1, 2023, were $0.0 million and $4.6 million, respectively. There were no unrealized losses on equity securities recorded in the three and nine months ended September 29, 2024. Unrealized losses on equity securities recorded in the three and nine months ended October 1, 2023, were $1.7 million. Unrealized gains and losses on equity securities are included in 'Other (income) expense, net' in the consolidated statement of operations.

Unrealized gains and losses on available-for-sale debt securities are included in 'Accumulated other comprehensive income (loss)' in the consolidated balance sheet.

The cost of securities sold is based on average cost.

The following tables set forth by fair value hierarchy Teradyne’s financial assets and liabilities that were measured at fair value on a recurring basis as of September 29, 2024, and December 31, 2023.

	September 29, 2024
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in thousands)
Assets
Cash	$	198,946	$	—	$	—	$	198,946
Cash equivalents		308,000		3,090		—		311,090
Available-for-sale securities:
U.S. Treasury securities		—		41,833		—		41,833
Corporate debt securities		—		37,149		—		37,149
Certificates of deposit and time deposits		—		21,741		—		21,741
Debt mutual funds		8,640		—		—		8,640
U.S. government agency securities		—		3,931		—		3,931
Non-U.S. government securities		—		801		—		801
Equity securities:
Mutual funds		53,480		—		—		53,480
	$	569,066	$	108,545	$	—	$	677,611
Derivative assets		—		332		—		332
Total	$	569,066	$	108,877	$	—	$	677,943
Liabilities
Derivative liabilities		—		1,435		—	$	1,435
Total	$	—	$	1,435	$	—	$	1,435
Reported as follows:
	(Level 1)		(Level 2)		(Level 3)		Total
	(in thousands)
Assets
Cash and cash equivalents	$	506,946	$	3,090	$	—	$	510,036
Marketable securities		—		41,631		—		41,631
Long-term marketable securities		62,120		63,824		—		125,944
Other current assets		—		332		—		332
Total	$	569,066	$	108,877	$	—	$	677,943
Liabilities
Other current liabilities		—		1,435		—		1,435
Total	$	—	$	1,435	$	—	$	1,435

	December 31, 2023
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in thousands)
Assets
Cash	$	298,156	$	—	$	—	$	298,156
Cash equivalents		453,298		6,117		—		459,415
Available-for-sale securities:
Corporate debt securities		—		52,734		—		52,734
U.S. Treasury securities		—		41,808		—		41,808
Certificates of deposit and time deposits		—		21,772		—		21,772
Debt mutual funds		8,773		—		—		8,773
U.S. government agency securities		—		4,892		—		4,892
Commercial paper		—		1,667		—		1,667
Non-U.S. government securities		—		810		—		810
Equity securities:
Mutual Funds		47,132		—		—		47,132
	$	807,359	$	129,800	$	—	$	937,159
Derivative assets		—		18,746		—		18,746
Total	$	807,359	$	148,546	$	—	$	955,905
Liabilities
Derivative liabilities		—		2,545		—		2,545
Total	$	—	$	2,545	$	—	$	2,545
Reported as follows:
	(Level 1)		(Level 2)		(Level 3)		Total
	(in thousands)
Assets
Cash and cash equivalents	$	751,454	$	6,117	$	—	$	757,571
Marketable securities		—		62,154		—		62,154
Long-term marketable securities		55,905		61,529		—		117,434
Other current assets		—		18,746		—		18,746
Total	$	807,359	$	148,546	$	—	$	955,905
Liabilities
Other current liabilities	$	—	$	2,545	$	—	$	2,545
Total	$	—	$	2,545	$	—	$	2,545

The carrying amounts and fair values of Teradyne’s financial instruments at September 29, 2024, and December 31, 2023, were as follows:

	September 29, 2024				December 31, 2023
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Assets
Cash and cash equivalents	$	510,036	$	510,036	$	757,571	$	757,571
Marketable securities		167,575		167,575		179,588		179,588
Derivative assets		332		332		18,746		18,746
Liabilities
Derivative liabilities		1,435		1,435		2,545		2,545

The fair values of accounts receivable, net and accounts payable approximate the carrying value due to the short-term nature of these instruments.

The following table summarizes the composition of available-for-sale marketable securities at September 29, 2024:

	September 29, 2024
	Available-for-Sale
	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
U.S. Treasury securities	$	45,522	$	106	$	(3,795	)	$	41,833	$	22,985
Corporate debt securities	$	39,986	$	323	$	(3,160	)	$	37,149	$	25,248
Certificates of deposit and time deposits		21,741		—		—			21,741		—
Debt mutual funds		8,846		—		(206	)		8,640		3,319
U.S. government agency securities		3,921		11		(1	)		3,931		876
Non-U.S. government securities		801		—		—			801		—
	$	120,817	$	440	$	(7,162	)	$	114,095	$	52,428

Reported as follows:

	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Marketable securities	$	41,673		20	$	(62	)	$	41,631	$	9,973
Long-term marketable securities		79,144		420		(7,100	)		72,464		42,455
	$	120,817	$	440	$	(7,162	)	$	114,095	$	52,428

The following table summarizes the composition of available-for-sale marketable securities at December 31, 2023:

	December 31, 2023
	Available-for-Sale
	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Corporate debt securities	$	56,458	$	201	$	(3,925	)	$	52,734	$	44,263
U.S. Treasury securities		45,725		14		(3,931	)		41,808		35,080
Certificates of deposit and time deposits		21,772		—		—			21,772		—
Debt mutual funds		9,081		—		(308	)		8,773		3,303
U.S. government agency securities		4,898		—		(6	)		4,892		4,892
Commercial paper		1,633		34		—			1,667		—
Non-U.S. government securities		810		—		—			810		—
	$	140,377	$	249	$	(8,170	)	$	132,456	$	87,538

Reported as follows:

	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Marketable securities	$	62,385	$	36	$	(267	)		62,154	$	34,844
Long-term marketable securities		77,992		213		(7,903	)		70,302		52,694
	$	140,377	$	249	$	(8,170	)	$	132,456	$	87,538

As of September 29, 2024, the fair market value of investments with unrealized losses less than one year and greater than one year totaled $8.3 million and $44.1 million, respectively. As of December 31, 2023, the fair market value of investments with unrealized losses for less than one year and greater than one year totaled $22.3 million and $65.2 million, respectively.

Teradyne reviews its investments to identify and evaluate investments that have an indication of possible impairment. Based on this review, Teradyne determined that the unrealized losses related to these investments at September 29, 2024, and December 31, 2023, were not other than temporary.

The contractual maturities of investments in available-for-sale securities held at September 29, 2024, were as follows:

	September 29, 2024
	Cost		Fair Market Value
	(in thousands)
Due within one year	$	41,673	$	41,631
Due after 1 year through 5 years		25,690		25,729
Due after 5 years through 10 years		7,950		7,908
Due after 10 years		36,658		30,187
Total	$	111,971	$	105,455

Contractual maturities of investments in available-for-sale securities held at September 29, 2024, exclude debt mutual funds with a fair market value of $8.6 million as they do not have a contractual maturity date.

Derivatives

Teradyne conducts business in various foreign countries, with certain transactions denominated in local currencies. As a result, Teradyne is exposed to risks relating to changes in foreign currency exchange rates. Teradyne’s foreign currency risk management objective is to minimize the effect of exchange rate fluctuations associated with the remeasurement of monetary assets and liabilities denominated in foreign currencies, and changes in its cash inflows attributable to the forecasted cash flows from certain foreign currency denominated revenues.

To minimize the effect of exchange rate fluctuations associated with the remeasurement of monetary assets and liabilities denominated in foreign currencies, Teradyne enters into foreign currency forward contracts. The change in fair value of these derivatives is recorded directly in earnings and is used to offset the change in value of monetary assets and liabilities denominated in foreign currencies.

Teradyne also enters into foreign currency forward and option contracts designated as cash flow hedges to hedge the risk of changes in its cash inflows attributable to changes in foreign currency exchange rates. The cash flow hedges have maturities of less than six months and mature in the period of revenue recognition for certain products and services in backlog and forecasted to be recognized in a future period. Teradyne evaluates cash flow hedges for effectiveness at inception based on the critical terms match method. The hedges are not expected to incur any ineffectiveness however a quarterly qualitative assessment of effectiveness is done to determine if the critical terms match method remains appropriate to use. The change in fair value of the contracts is recorded in accumulated other comprehensive income (loss) and reclassified to earnings at maturity date.

Teradyne does not use derivative financial instruments for speculative purposes.

At September 29, 2024, and December 31, 2023, Teradyne had the following contracts to buy and sell non-U.S. currencies for U.S. dollars and other non-U.S. currencies with the following notional amounts:

	Net Notional Value
	September 29, 2024		December 31, 2023
	(in millions)
Currency Hedged (Buy/Sell)
U.S. dollar/Taiwan dollar		29.6		42.7
U.S. dollar/Japanese yen		21.7		11.0
U.S. dollar/Korean won		8.9		7.2
U.S. dollar/British pound sterling		1.0		1.5
U.S. dollar/Danish krone		—		36.0
Danish krone/U.S. dollar		25.7		0.7
Euro/U.S. dollar		24.8		25.3
Singapore dollar/U.S. dollar		23.0		16.6
Philippine peso/U.S. dollar		9.7		10.1
Chinese yuan/U.S. dollar		1.7		1.0
Total	$	146.1	$	152.1

The fair value of the outstanding contracts was a net loss of $0.8 million and a net loss of $1.8 million at September 29, 2024, and December 31, 2023, respectively.

Unrealized gains and losses on foreign currency forward contracts and foreign currency remeasurement gains and losses on monetary assets and liabilities are included in 'Other (income) expense, net' in the consolidated statement of operations.

At September 29, 2024, and December 31, 2023, Teradyne had the following cash flow hedge contracts to buy and sell non-U.S. currencies for U.S. dollars with the following notional amounts:

	Net Notional Value
	September 29, 2024		December 31, 2023
	(in millions)
Currency Hedged (Buy/Sell)
U.S. dollar/Japanese yen	$	12.1	$	35.5
Total	$	12.1	$	35.5

The fair value of the outstanding cash flow hedge contracts was a loss of $0.3 million and a gain of $0.6 million at September 29, 2024, and December 31, 2023, respectively.

Unrealized gains and losses on foreign currency cash flow hedge contracts are included in accumulated other comprehensive income (loss). At maturity, the gains or losses associated with cash flow hedge contracts are recorded to revenue.

On November 7, 2023, in connection with Teradyne's agreement to acquire 10% investment in Technoprobe S.p.A, Teradyne purchased a call option to buy 481.0 million Euros. The expiration date of the option was April 26, 2024. On April 12, 2024, Teradyne entered into a forward to buy 481.0 million Euros which expired on May 23, 2024. At December 31, 2023, the fair value of the outstanding contract was $17.4 million. For the nine months ended September 29, 2024, a realized loss of $9.8 million was recorded in 'Other (income) expense, net' in the consolidated statement of operations.

The following table summarizes the fair value of derivative instruments as of September 29, 2024, and December 31, 2023:

	Balance Sheet Location	September 29, 2024			December 31, 2023
		(in thousands)
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts	Other current assets		332			733
Foreign exchange forward contracts	Other current liabilities		(1,102	)		(2,545	)
Foreign exchange option contracts	Other current assets		—			17,364
Derivatives designated as hedging instruments:
Foreign exchange forward contracts	Other current assets		—			648
Foreign exchange forward contracts	Other current liabilities		(333	)		—
Total derivatives		$	(1,103	)	$	16,200

The following table summarizes the effect of derivative instruments recognized in the statement of operations for the three and nine months ended September 29, 2024, and October 1, 2023:

		For the Three Months  Ended					For the Nine Months  Ended
	Location of (Gains) Losses Recognized in Statement of Operations	September 29, 2024		October 1, 2023			September 29, 2024			October 1, 2023
		(in thousands)					(in thousands)
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts (1)	Other (income) expense, net	$	4,829	$	(1,886	)	$	686		$	(4,667	)
Foreign exchange option contracts	Other (income) expense, net		—		—			9,764			—
Derivatives designated as hedging instruments:
Foreign exchange forward and option contracts	Revenue		—		(3,960	)		(2,280	)		(2,008	)
Total Derivatives		$	4,829	$	(5,846	)	$	8,170		$	(6,675	)

(1)The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies. For the three and nine months ended September 29, 2024, net losses (gains) from remeasurement of monetary assets and liabilities denominated in foreign currencies were $(2.9) million and $3.1 million, respectively. For the three and nine months ended October 1, 2023, net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $5.3 million and $12.3 million, respectively.

See Note I: “Debt” regarding derivatives related to the convertible senior notes.

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Debt

9 Months Ended

Sep. 29, 2024

Debt

I. DEBT

Convertible Senior Notes

On December 12, 2016, Teradyne completed a private offering of $460.0 million aggregate principal amount of 1.25% convertible senior unsecured notes (the “Notes”) and received net proceeds, after issuance costs, of approximately $450.8 million, $33.0 million of which was used to pay the net cost of the convertible note hedge transactions and $50.1 million of which was used to repurchase 2.0 million shares of Teradyne’s common stock under its existing stock repurchase program from purchasers of the Notes in privately negotiated transactions effected through one of the initial purchasers or its affiliates conducted concurrently with the pricing of the Note offering. The Notes bore interest at a rate of 1.25% per year, payable semiannually in arrears on June 15 and December 15 of each year. The Notes matured on December 15, 2023.

Concurrent with the offering of the Notes, Teradyne entered into convertible note hedge transactions (the “Note Hedge Transactions”) with the initial purchasers or their affiliates (the “Option Counterparties”). The Note Hedge Transactions cover, subject to customary anti-dilution adjustments, the number of shares of the common stock that underlie the Notes. Separately and concurrent with the pricing of the Notes, Teradyne entered into warrant transactions with the Option Counterparties (the “Warrant Transactions”) in which it sold net-share-settled (or, at its election subject to certain conditions, cash-settled) warrants to the Option Counterparties. These transactions have been accounted for as an adjustment to Teradyne's shareholders’ equity. The Warrant Transactions, which began expiring March 18, 2024, and continued to expire through July 10, 2024, covered, subject to customary anti-dilution adjustments, approximately 1.3 million shares of common stock. During the three and nine months ended September 29, 2024, 1.3 million and 14.7 million warrants expired, resulting in the issuance of 1.2 million and 10.0 million shares of Teradyne common stock, respectively. As of the final date of expiration, July 10, 2024, the strike price of the warrants was approximately $39.35 per shares.

The Warrant Transactions resulted in additional shares of Teradyne’s common stock being issued to the extent that the market price per share of Teradyne’s common stock, as measured under the terms of the Warrant Transactions, exceeds the applicable strike price of the warrants.

The interest expense on Teradyne's senior notes for three and nine months ended October 1, 2023, was as follows:

	For the Three Months  Ended				For the Nine Months  Ended
	September 29, 2024		October 1, 2023		September 29, 2024		October 1, 2023
	(in thousands)				(in thousands)
Contractual interest expense on the coupon	$	—	$	74	$	—	$	312
Amortization of debt issuance fees recognized as interest expense		—		—		—		113
Total interest expense on the convertible debt	$	—	$	74	$	—	$	425

Revolving Credit Facility

On May 1, 2020, Teradyne entered into a credit agreement (the “Credit Agreement”) with Truist Bank, as administrative agent and collateral agent, and the lenders party thereto. The Credit Agreement provided for a three-year, senior secured revolving credit facility of $400.0 million (the “Credit Facility”).

On December 10, 2021, the Credit Agreement was amended to extend the maturity date of the Credit Facility to December 10, 2026. On October 5, 2022, the Credit Agreement was amended to increase the amount of the Credit Facility to $750.0 million from $400.0 million. On November 7, 2023, the Credit Agreement was amended to allow for the purchase of the shares of Technoprobe.

The Credit Agreement provides that, subject to customary conditions, Teradyne may seek to obtain from existing or new lenders the available incremental amount under the Credit Facility, not to exceed the greater of $200.0 million or 15% of consolidated EBIDTA. The interest rate applicable to loans under the Credit Facility are, at Teradyne’s option, equal to either a base rate plus a margin ranging from 0.00% to 0.75% per annum or SOFR plus a margin ranging from 1.10% to 1.85% per annum, based on the consolidated leverage ratio of Teradyne. In addition, Teradyne will pay a commitment fee on the unused portion of the commitments under the Credit Facility ranging from 0.15% to 0.25% per annum, based on the then applicable consolidated leverage ratio.

Teradyne is not required to repay any loans under the Credit Facility prior to maturity, subject to certain customary exceptions. Teradyne is permitted to prepay all or any portion of the loans under the Credit Facility prior to maturity without premium or penalty, other than customary SOFR breakage costs.

The Credit Agreement contains customary events of default, representations, warranties, and affirmative and negative covenants that, among other things, limit Teradyne’s ability to sell assets, grant liens on assets, incur other secured indebtedness and make certain investments and restricted payments, all subject to exceptions set forth in the Credit Agreement. The Credit Agreement also requires Teradyne to satisfy two financial ratios measured at the end of each fiscal quarter: a consolidated leverage ratio and an interest coverage ratio.

The Credit Facility is guaranteed by certain of Teradyne’s domestic subsidiaries and collateralized by assets of Teradyne and such subsidiaries, including a pledge of 65% of the capital stock of certain foreign subsidiaries.

On May 16, 2024, Teradyne borrowed $185.0 million under the Credit Agreement to support the acquisition of 10% of the issued and outstanding shares of Technoprobe. Teradyne fully repaid its borrowings on the revolving credit facility prior to September 29, 2024. There was no outstanding revolver balance as of September 29, 2024.

As of November 1, 2024, the Credit Facility was undrawn, and Teradyne was in compliance with all covenants under the Credit Agreement.

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Prepayments

9 Months Ended

Sep. 29, 2024

Prepayments [Abstract]

Prepayments

J. PREPAYMENTS

Prepayments consist of the following:

	September 29, 2024		December 31, 2023
	(in thousands)
Contract manufacturer and supplier prepayments	$	439,647	$	502,257
Prepaid taxes		20,734		16,083
Prepaid maintenance and other services		19,040		17,592
Other prepayments		10,127		13,038
Total prepayments (1)	$	489,548	$	548,970

(1)Excludes $5.3 million at December 31, 2023, of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: “Dispositions” for additional information.

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Product Warranty

9 Months Ended

Sep. 29, 2024

Product Warranty

K. PRODUCT WARRANTY

Teradyne generally provides a one-year warranty on its products, commencing upon installation, acceptance or shipment. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience. Related costs are charged to the warranty accrual as incurred. The balance below is included in other accrued liabilities.

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
	(in thousands)						(in thousands)
Balance at beginning of period	$	15,244		$	12,543		$	15,698		$	14,181
Accruals for warranties issued during the period		2,149			8,859			8,331			16,237
Accruals related to pre-existing warranties		(545	)		(795	)		(1,513	)		(1,552	)
Settlements made during the period		(2,990	)		(5,892	)		(8,658	)		(14,151	)
Balance at end of period	$	13,858		$	14,715		$	13,858		$	14,715

When Teradyne receives revenue for extended warranties beyond one year it is treated as a separate performance obligation and deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. The balance below is included in short and long-term deferred revenue and customer advances.

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
	(in thousands)						(in thousands)
Balance at beginning of period	$	33,512		$	44,422		$	34,897		$	56,180
Deferral of new extended warranty revenue		9,714			2,734			22,316			11,615
Recognition of extended warranty deferred revenue		(4,297	)		(8,313	)		(18,284	)		(28,952	)
Balance at end of period	$	38,929		$	38,843		$	38,929		$	38,843

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Stock-Based Compensation

9 Months Ended

Sep. 29, 2024

Stock-Based Compensation

L. STOCK-BASED COMPENSATION

On February 1, 2023 (the “Retirement Date”), Mark E. Jagiela retired as Chief Executive Officer of Teradyne and a member of Teradyne’s Board of Directors, and Teradyne entered into an agreement (the “Retirement Agreement”) with Mr. Jagiela. Under the Retirement Agreement, Mr. Jagiela’s unvested time-based restricted stock units and stock options granted prior to his Retirement Date were modified to allow continued vesting; and any vested options or options that vest during that period may be exercised for the remainder of the applicable option term. During the nine months ended October 1, 2023, Teradyne recorded a stock-based compensation expense of $5.9 million related to the Retirement Agreement.

Under Teradyne’s stock compensation plans, Teradyne grants time-based restricted stock units, performance-based restricted stock units and stock options, and employees are eligible to purchase Teradyne’s common stock through its Employee Stock Purchase Plan (“ESPP”).

Service-based restricted stock unit awards granted to employees vest in equal annual installments over four years. Restricted stock unit awards granted to non-employee directors vest after a one-year period, with 100% of the award vesting on the earlier of (a) the first anniversary of the grant date or (b) the date of the following year’s Annual Meeting of Shareholders. Teradyne expenses the cost of the restricted stock unit awards subject to time-based vesting, which is determined to be the fair market value of the shares at the date of grant, ratably over the period during which the restrictions lapse.

Performance-based restricted stock units (“PRSUs”) granted to Teradyne’s executive officers may have a performance metric based on relative total shareholder return (“TSR”). Teradyne’s three-year TSR performance is measured against the New York Stock Exchange (“NYSE”) Composite Index. The final number of TSR PRSUs that vest will vary based upon the level of performance achieved from 0% to 200% of the target shares. The TSR PRSUs will vest upon the three-year anniversary of the grant date. The TSR PRSUs are valued using a Monte Carlo simulation model. The number of units expected to be earned, based upon the achievement of the TSR market condition, is factored into the grant date Monte Carlo valuation. Compensation expense is recognized on a straight-line basis over the shorter of the three-year service period or the period from the grant to the date described in the retirement provisions below. Compensation expense for executive officers meeting the retirement provisions prior to the grant date is recognized during the year following the grant. Compensation expense is recognized regardless of the eventual number of units that are earned based upon the market condition, provided the executive officer remains an employee at the end of the three-year period. Compensation expense is reversed if at any time during the three-year service period the executive officer is no longer an employee, subject to the retirement and termination eligibility provisions noted below.

PRSUs granted to Teradyne’s executive officers may also have a performance metric based on three-year cumulative non-GAAP profit before interest and tax (“PBIT”) as a percent of Teradyne’s revenue. Non-GAAP PBIT is a financial measure equal to GAAP income from operations less restructuring and other, net; amortization of acquired intangible assets; acquisition and divestiture related charges or credits; pension actuarial gains and losses; non-cash convertible debt interest expense; and other non-recurring gains and charges. The final number of PBIT PRSUs that vest will vary based upon the level of performance achieved from 0% to 200% of the target shares. The PBIT PRSUs will vest upon the three-year anniversary of the grant date. Compensation expense is recognized on a straight-line basis over the shorter of the three-year service period or the period from the grant date to the date described in the retirement provisions below. Compensation expense for executive officers meeting the retirement provisions prior to the grant date is recognized during the year following the grant. Compensation expense is recognized based on the number of units that are earned based upon the three-year Teradyne PBIT as a percent of Teradyne’s revenue, provided the executive officer remains an employee at the end of the three-year period subject to the retirement and termination eligibility provisions noted below.

If a PRSU recipient’s employment ends prior to the determination of the performance percentage due to (1) death or (2) after attaining both at least age sixty and at least ten years of service, retirement or termination other than for cause, then all or a portion of the recipient’s PRSUs (based on the actual performance percentage achieved on the determination date) will vest on the date the performance percentage is determined. Except as set forth in the preceding sentence, no PRSUs will vest if the executive officer is no longer an employee at the end of the three-year period. Stock options to purchase Teradyne’s common stock at 100% of the fair market value on the grant date vest in equal annual installments over four years from the grant date and have a maximum term of seven years.

On January 22, 2024, the Board enacted the Executive Retirement Policy for Restricted Stock Unit and Option Vesting (the "Retirement Policy"). Under the Retirement Policy, an executive officer that is over the age of 65 and has 10 or more years of service as of the effective date of his or her retirement will be eligible for continued vesting of his or her unvested time-based restricted stock units and stock options granted prior to his or her retirement date.

During the nine months ended September 29, 2024, and October 1, 2023, Teradyne granted 0.6 million and 0.5 million of service-based restricted stock unit awards to employees at a weighted average grant date fair value of $95.98 and $102.66, respectively, and less than 0.1 million and 0.1 million of service-based restricted stock unit awards to non-employee directors at a weighted average grant date fair value of $120.38 and $90.50, respectively.

During the nine months ended September 29, 2024, and October 1, 2023, Teradyne granted 0.1 million and 0.1 million of PBIT PRSUs with a weighted average grant date fair value of $94.51 and $102.91, respectively.

During the nine months ended September 29, 2024, and October 1, 2023, Teradyne granted 0.1 million and 0.1 million of TSR PRSUs, with a weighted average grant date fair value of $102.51 and $139.04, respectively. The grant date fair value was estimated using the Monte Carlo simulation model with the following assumptions:

	For the Nine Months  Ended
	September 29, 2024			October 1, 2023
Risk-free interest rate		3.9	%		4.0	%
Teradyne volatility-historical		42.4	%		49.7	%
NYSE Composite Index volatility-historical		15.6	%		24.1	%
Dividend yield		0.5	%		0.4	%

Expected volatility was based on the historical volatility of Teradyne’s stock and the NYSE Composite Index over the most recent three-year period. The risk-free interest rate was determined using the U.S. Treasury yield curve in effect at the time of the applicable grant. Dividend yield was based upon an estimated annual dividend amount of $0.48 per share divided by Teradyne’s stock price on the grant dates, which have a weighted average grant date stock price of $95.83 for the 2024 grants, and an estimated annual dividend amount of $0.44 per share divided by Teradyne’s stock price on the grant date of $104.12 for the 2023 grant.

During the nine months ended September 29, 2024, and October 1, 2023, Teradyne granted 0.1 million and 0.1 million of service-based stock options to executive officers at a weighted average grant date fair value of $37.50 and $41.23, respectively.

The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions:

	For the Nine Months  Ended
	September 29, 2024			October 1, 2023
Expected life (years)		4.0			4.0
Risk-free interest rate		4.0	%		3.8	%
Volatility-historical		46.3	%		46.6	%
Dividend yield		0.5	%		0.4	%

Teradyne determined the stock options’ expected life based upon historical exercise data for executive officers, the age of the executive officers and the terms of the stock option grant. Volatility was determined using historical volatility for a period equal to the expected life. The risk-free interest rate was determined using the U.S. Treasury yield curve in effect at the time of grant. Dividend yield was based upon an estimated annual dividend amount of $0.48 per share divided by Teradyne’s stock price on the grant date of $95.14 for the 2024 grant and an estimated annual dividend amount of $0.44 per share divided by Teradyne’s stock price on the grant date of $104.15 for the 2023 grant.

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Accumulated Other Comprehensive Income (Loss)

9 Months Ended

Sep. 29, 2024

Accumulated Other Comprehensive Income (Loss)

M. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

Changes in accumulated other comprehensive income (loss), which are presented net of tax, consist of the following:

	Foreign Currency Translation Adjustment			Unrealized (Losses) Gains on Marketable Securities			Unrealized (Losses) Gains on Cash Flow Hedges			Retirement Plans Prior Service Credit			Total
	(in thousands)
Nine Months Ended September 29, 2024
Balance at December 31, 2023, net of tax of $0, $(1,728), $142, $(1,132), respectively	$	(22,442	)	$	(6,194	)	$	506		$	1,152		$	(26,978	)
Other comprehensive (loss) gain before reclassifications, net of tax of $0, $205, $285, $0, respectively		22,751			885			1,014			—			24,650
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of $0, $24, $(500), $(1), respectively		—			86			(1,780	)		(6	)		(1,700	)
Net current period other comprehensive (loss) gain, net of tax of $0, $229, $(215), $(1), respectively		22,751			971			(766	)		(6	)		22,950
Balance at September 29, 2024, net of tax of $0, $(1,499), $(73), $(1,133), respectively	$	309		$	(5,223	)	$	(260	)	$	1,146		$	(4,028	)
Nine Months Ended October 1, 2023
Balance at December 31, 2022, net of tax of $0, $(2,308), $(708), $(1,130), respectively	$	(39,849	)	$	(8,661	)	$	(2,517	)	$	1,159		$	(49,868	)
Other comprehensive (loss) gain before reclassifications, net of tax of $0, $(408), $1,816, $0, respectively		(2,073	)		(903	)		6,456			—			3,480
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of $0, $9, $(441), $(1), respectively		—			33			(1,567	)		(6	)		(1,540	)
Net current period other comprehensive (loss) gain, net of tax of $0, $(399), $1,375, $(1), respectively		(2,073	)		(870	)		4,889			(6	)		1,940
Balance at October 1, 2023, net of tax of $0, $(2,707), $667, $(1,131), respectively	$	(41,922	)	$	(9,531	)	$	2,372		$	1,153		$	(47,928	)

Reclassifications out of accumulated other comprehensive income (loss) to the statement of operations for the three and nine months ended September 29, 2024, and October 1, 2023, were as follows:

Details about Accumulated Other Comprehensive Income (Loss) Components	For the Three Months  Ended				For the Nine Months  Ended						Affected Line Item in the Statements of Operations
	September 29, 2024		October 1, 2023		September 29, 2024			October 1, 2023
	(in thousands)				(in thousands)
Available-for-sale marketable securities:
Unrealized (losses) gains, net of tax of $2, $0, $(24), $(9), respectively	$	7	$	—	$	(86	)	$	(33	)	Other (income) expense, net
Cash flow hedges:
Unrealized (losses) gains, net of tax of $0, $869, $500, $441, respectively		—		3,091		1,780			1,567		Revenue
Defined benefit pension and postretirement plans:
Amortization of prior service credit, net of tax of $0, $0, $1, $1, respectively		2		2		6			6		(a)
Total reclassifications, net of tax of $2, $869, $477, $433 respectively	$	9	$	3,093	$	1,700		$	1,540		Net income

The amortization of prior service credit is included in the computation of net periodic postretirement benefit cost. See Note Q: “Retirement Plans.”

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Goodwill and Acquired Intangible Assets

9 Months Ended

Sep. 29, 2024

Goodwill and Acquired Intangible Assets

N. GOODWILL AND ACQUIRED INTANGIBLE ASSETS

Goodwill

Teradyne performs its annual goodwill impairment test as required under the provisions of ASC 350-10, “Intangibles—Goodwill and Other” on December 31 of each fiscal year unless interim indicators of impairment exist. In the nine months ended September 29, 2024, there were no interim indicators of impairment. Goodwill is considered impaired when the net book value of a reporting unit exceeds its estimated fair value.

The changes in the carrying amount of goodwill by reportable segments for the nine months ended September 29, 2024, were as follows:

	Robotics		Wireless Test			Semiconductor Test			System Test			Total
	(in thousands)
Balance at December 31, 2023
Goodwill	$	395,463	$	361,819		$	262,237		$	158,699		$	1,178,218
Accumulated impairment losses		—		(353,843	)		(260,540	)		(148,183	)		(762,566	)
Total Goodwill		395,463		7,976			1,697			10,516			415,652
Foreign currency translation adjustment		3,765		—			(5	)		—			3,760
Balance at September 29, 2024
Goodwill	$	399,229	$	361,819		$	262,232		$	158,699			1,181,978
Accumulated impairment losses		—		(353,843	)		(260,540	)		(148,183	)		(762,566	)
Total Goodwill	$	399,229	$	7,976		$	1,692		$	10,516		$	419,412

Intangible Assets

Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet:

	Gross Carrying Amount		Accumulated Amortization			Foreign Currency Translation Adjustment			Net Carrying Amount
	(in thousands)
Balance at September 29, 2024
Developed technology	$	267,706	$	(252,406	)	$	(5,337	)	$	9,963
Customer relationships		52,109		(49,134	)		210			3,185
Tradenames and trademarks		59,007		(49,618	)		(1,249	)		8,140
Total intangible assets	$	378,822	$	(351,158	)	$	(6,376	)	$	21,288
Balance at December 31, 2023
Developed technology	$	267,706	$	(243,191	)	$	(5,343	)	$	19,172
Customer relationships		52,109		(47,850	)		232			4,491
Tradenames and trademarks		59,007		(46,021	)		(1,245	)		11,741
Total intangible assets	$	378,822	$	(337,062	)	$	(6,356	)	$	35,404

Aggregate intangible asset amortization expense was $4.7 million and $14.1 million, respectively, for the three and nine months ended September 29, 2024, and $4.7 million and $14.3 million, respectively, for the three and nine months ended October 1, 2023.

Estimated intangible asset amortization expense for each of the five succeeding fiscal years and thereafter is as follows:

Year	Amortization Expense
	(in thousands)
2024	$	4,775
2025		11,454
2026		2,402
2027		1,185
2028		1,104
Thereafter		368

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Net Income Per Common Share

9 Months Ended

Sep. 29, 2024

Net Income per Common Share

O. NET INCOME PER COMMON SHARE

The following table sets forth the computation of basic and diluted net income per common share:

	For the Three Months  Ended				For the Nine Months  Ended
	September 29, 2024		October 1, 2023		September 29, 2024		October 1, 2023
	(in thousands, except per share amounts)				(in thousands, except per share amounts)
Net income for basic and diluted net income per share	$	145,649	$	128,116	$	396,119	$	331,698
Weighted average common shares-basic		163,002		153,762		157,951		154,809
Effect of dilutive potential common shares:
Restricted stock units		768		455		637		410
Convertible note hedge warrant shares (1)		460		9,168		4,751		9,009
Stock options		13		26		13		39
Employee stock purchase plan		10		10		5		8
Incremental shares from assumed conversion of convertible notes (2)		—		629		—		762
Dilutive potential common shares		1,251		10,288		5,406		10,228
Weighted average common shares-diluted		164,253		164,050		163,357		165,037
Net income per common share-basic	$	0.89	$	0.83	$	2.51	$	2.14
Net income per common share-diluted	$	0.89	$	0.78	$	2.42	$	2.01

(1)Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price, multiplied by the number of warrant shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period.

(2)Incremental shares from assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible notes, was divided by the average Teradyne stock price for the period.

The computation of diluted net income per common share for the three and nine months ended September 29, 2024, excludes the effect of the potential vesting of 0.1 million and 0.5 million, respectively, of restricted stock units because the effect would have been anti-dilutive.

The computation of diluted net income per common share for the three and nine months ended October 1, 2023, excludes the effect of the potential vesting of 0.1 million and 0.4 million, respectively, of restricted stock units because the effect would have been anti-dilutive.

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Restructuring and Other

9 Months Ended

Sep. 29, 2024

Restructuring and Related Activities [Abstract]

Restructuring and Other

P. RESTRUCTURING AND OTHER

During the three months ended September 29, 2024, Teradyne recorded restructuring and other charges primarily related to $1.3 million of severance charges related to headcount reductions principally in Robotics.

During the three months ended October 1, 2023, Teradyne recorded restructuring and other charges primarily related to $4.7 million of severance charges related to headcount reductions of 94 people, principally in Semiconductor Test and Robotics, which included charges related to a voluntary early retirement program for employees meeting certain conditions, and a $1.5 million contract termination charge.

During the nine months ended September 29, 2024, Teradyne recorded restructuring and other charges primarily related to $5.3 million of severance and other charges, related to headcount reductions of 87 people primarily in Robotics and Semiconductor Test, which included charges related to a voluntary early retirement program for employees meeting certain conditions, and $2.2 million of acquisition and divestiture expenses related to the Technoprobe transactions.

During the nine months ended October 1, 2023, Teradyne recorded restructuring and other charges primarily related to $11.8 million of severance charges related to headcount reductions of 197 people, primarily in Semiconductor Test and Robotics, which included which included charges related to a voluntary early retirement program for employees meeting certain conditions, a $1.5 million contract termination charge, and a charge of $1.1 million for an increase in environmental liability.

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Retirement Plans

9 Months Ended

Sep. 29, 2024

Retirement Plans

Q. RETIREMENT PLANS

ASC 715, “Compensation—Retirement Benefits,” requires an employer with defined benefit plans or other postretirement benefit plans to recognize an asset or a liability on its balance sheet for the overfunded or underfunded status of the plans as defined by ASC 715. The pension asset or liability represents a difference between the fair value of the pension plan’s assets and the projected benefit obligation at December 31. Teradyne uses a December 31 measurement date for all its plans.

Defined Benefit Pension Plans

Teradyne has defined benefit pension plans covering a portion of domestic employees and employees of certain non-U.S. subsidiaries. Benefits under these plans are based on employees’ years of service and compensation. Teradyne’s funding policy is to make contributions to these plans in accordance with local laws and to the extent that such contributions are tax deductible. The assets of the U.S. qualified pension plan consist primarily of fixed income and equity securities. In addition, Teradyne has an unfunded supplemental executive defined benefit plan in the United States to provide retirement benefits in excess of levels allowed by the Employment Retirement Income Security Act (“ERISA”) and the Internal Revenue Code (the “IRC”), as well as unfunded qualified foreign plans.

During the three months ended September 29, 2024, Teradyne purchased a group annuity contract for its retiree participants in the U.S. qualified pension plan. Under the group annuity, the accrued pension obligation for 132 retiree participants were transferred to an insurance company. The reduction in the pension benefit obligation and pension assets was $23.4 million. During the three and nine months ended September 29, 2024, Teradyne recorded settlement expense of $0.4 million related to the retiree group annuity transaction.

In the nine months ended September 29, 2024, and October 1, 2023, Teradyne contributed $2.3 million and $2.3 million, respectively, to the U.S. supplemental executive defined benefit pension plan, and $0.8 million and $0.8 million, respectively, to certain qualified pension plans for non-U.S. subsidiaries.

For the three and nine months ended September 29, 2024, and October 1, 2023, Teradyne’s net periodic pension cost was comprised of the following:

	For the Three Months Ended
	September 29, 2024						October 1, 2023
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	216		$	119		$	272		$	107
Interest cost		1,590			256			1,713			253
Expected return on plan assets		(1,204	)		(23	)		(1,286	)		(11	)
Net actuarial loss (gain)		(2,262	)		—			—			66
Settlement expense		394			—			—			5
Total net periodic pension cost	$	(1,266	)	$	352		$	699		$	420

	For the Nine Months Ended
	September 29, 2024						October 1, 2023
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	665		$	360		$	815		$	320
Interest cost		4,883			766			5,138			762
Expected return on plan assets		(3,737	)		(58	)		(3,856	)		(28	)
Net actuarial loss (gain)		(2,151	)		(242	)		24			66
Settlement expense		394			(24	)		—			5
Total net periodic pension cost	$	54		$	802		$	2,121		$	1,125

Postretirement Benefit Plan

In addition to receiving pension benefits, Teradyne employees in the United States who meet early retirement eligibility requirements as of their termination dates may participate in Teradyne’s Welfare Plan, which includes medical and dental benefits up to age 65. Death benefits provide a fixed sum to retirees’ survivors and are available to all retirees. Substantially all of Teradyne’s current U.S. employees could become eligible for these benefits and the existing benefit obligation relates predominantly to those

employees. During the nine months ended September 29, 2024, Teradyne recorded special termination benefit charges associated with a voluntary early retirement program.

For the three and nine months ended September 29, 2024, and October 1, 2023, Teradyne’s net periodic postretirement benefit cost was comprised of the following:

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
	(in thousands)						(in thousands)
Service cost	$	9		$	9		$	28		$	26
Interest cost		72			60			217			181
Amortization of prior service credit		(2	)		(2	)		(7	)		(7	)
Special termination benefits		—			1,423			462			1,792
Net actuarial loss (gain)		—			—			(94	)		30
Total net periodic postretirement benefit cost	$	79		$	1,490		$	606		$	2,022

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Commitments and Contingencies

9 Months Ended

Sep. 29, 2024

Commitments and Contingencies

R. COMMITMENTS AND CONTINGENCIES

Purchase Commitments

As of September 29, 2024, Teradyne had entered into purchase commitments for certain components and materials. The purchase commitments covered by the agreements aggregate to approximately $458.1 million, of which $445.9 million is for less than one year.

Legal Claims

Teradyne is subject to various legal proceedings and claims which have arisen in the ordinary course of business such as, but not limited to, patent, employment, commercial and environmental matters. Teradyne believes that it has meritorious defenses against all pending claims and intends to vigorously contest them. While it is not possible to predict or determine the outcomes of any pending claims or to provide possible ranges of losses that may arise, Teradyne believes the potential losses associated with all of these actions are unlikely to have a material adverse effect on its business, financial position or results of operations.

Guarantees and Indemnification Obligations

Teradyne provides indemnification, to the extent permitted by law, to its officers, directors, employees and agents for liabilities arising from certain events or occurrences, while the officer, director, employee, or agent, is or was serving, at Teradyne’s request in such capacity. Teradyne may enter into indemnification agreements with certain of its officers and directors. With respect to acquisitions, Teradyne provides indemnifications to or assumes indemnification obligations for the current and former directors, officers and employees of the acquired companies in accordance with the acquired companies’ by-laws and charter. As a matter of practice, Teradyne has maintained directors’ and officers’ liability insurance coverage including coverage for directors and officers of acquired companies.

Teradyne enters into agreements in the ordinary course of business with customers, resellers, distributors, integrators, and suppliers. Most of these agreements require Teradyne to defend and/or indemnify the other party against intellectual property infringement claims brought by a third party with respect to Teradyne’s products. From time to time, Teradyne also indemnifies customers and business partners for damages, losses and liabilities they may suffer or incur relating to personal injury, personal property damage, product liability, breach of confidentiality obligations and environmental claims relating to the use of Teradyne’s products and services or resulting from the acts or omissions of Teradyne, its employees, authorized agents or subcontractors. On occasion, Teradyne has also provided guarantees to customers regarding the delivery and performance of its products in addition to the warranty described below.

As a matter of ordinary course of business, Teradyne warrants that its products will substantially perform in accordance with its standard published specifications in effect at the time of delivery. Most warranties have a one-year duration commencing from installation. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based upon historical experience. When Teradyne receives revenue for extended warranties beyond the standard duration, the revenue is deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. As of September 29, 2024, and December 31, 2023, Teradyne had a product warranty accrual of $13.9 million and $15.7 million, respectively, included in other

accrued liabilities and revenue deferrals related to extended warranties of $38.9 million and $34.9 million, respectively, included in short and long-term deferred revenue and customer advances.

In addition, in the ordinary course of business, Teradyne provides minimum purchase guarantees to certain vendors to ensure continuity of supply against the market demand. Although some of these guarantees provide penalties for cancellations and/or modifications to the purchase commitments as the market demand decreases, most of the guarantees do not. Therefore, as the market demand decreases, Teradyne re-evaluates these guarantees and determines what charges, if any, should be recorded.

With respect to its agreements covering product, business or entity divestitures and acquisitions, Teradyne provides certain representations, warranties and covenants to purchasers and agrees to indemnify and hold such purchasers harmless against breaches of such representations, warranties, and covenants. Many of the indemnification claims have a definite expiration date while some remain in force indefinitely. With respect to its acquisitions, Teradyne may, from time to time, assume the liability for certain events or occurrences that took place prior to the date of acquisition.

As a matter of ordinary course of business, Teradyne occasionally guarantees certain indebtedness obligations of its subsidiary companies, limited to the borrowings from financial institutions, purchase commitments to certain vendors and lease commitments to landlords.

Based on historical experience and information known as of September 29, 2024, and December 31, 2023, except for product warranty, Teradyne has not recorded any liabilities for these guarantees and obligations because the amount would be immaterial.

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Income Taxes

9 Months Ended

Sep. 29, 2024

Income Taxes

S. INCOME TAXES

A reconciliation of the United States federal statutory corporate tax rate to Teradyne’s effective tax rate was as follows:

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
U.S. statutory federal tax rate		21.0	%		21.0	%		21.0	%		21.0	%
Non-deductible officers' compensation		0.5			1.3			0.4			1.1
Tax credits		(5.0	)		(9.3	)		(3.6	)		(5.0	)
Discrete expense (benefit) related to reserves for uncertain tax positions		(4.9	)		0.3			(2.2	)		0.1
Foreign taxes		(4.9	)		(1.5	)		(3.3	)		(1.1	)
International provisions of the U.S. Tax Cuts and Jobs Act of 2017		(0.8	)		(3.1	)		(1.1	)		(2.9	)
Other, net		1.9			2.5			0.8			0.8
Effective tax rate		7.8	%		11.2	%		12.0	%		14.0	%

On a quarterly basis, Teradyne evaluates the realizability of the deferred tax assets by jurisdiction and assesses the need for a valuation allowance. As of September 29, 2024, Teradyne believes that it will ultimately realize the deferred tax assets recorded on the condensed consolidated balance sheet. However, should Teradyne believe that it is more-likely-than-not that the deferred tax assets would not be realized, the tax provision would increase in the period in which Teradyne determined that the realizability was not likely. Teradyne considers the probability of future taxable income and historical profitability, among other factors, in assessing the realizability of the deferred tax assets.

As of September 29, 2024, and December 31, 2023, Teradyne had $7.6 million and $18.6 million, respectively, of reserves for uncertain tax positions. The $11.0 million net decrease in reserves for uncertain tax positions is related to the audit settlements.

As of September 29, 2024, Teradyne estimates that it is reasonably possible that the balance of unrecognized tax benefits may decrease approximately $0.7 million in the next twelve months because of a lapse of statutes of limitation. The estimated decrease relates to transfer pricing and U.S. federal and state research and development credits.

Teradyne recognizes interest and penalties related to income tax matters in income tax expense. As of September 29, 2024, and December 31, 2023, $0.2 million and $1.3 million, respectively, of interest and penalties were accrued for uncertain tax positions. For the nine months ended September 29, 2024, and October 1, 2023, a benefit of $1.0 million and expense of $0.2 million, respectively, were recorded for interest and penalties related to income tax items.

Teradyne qualifies for a tax holiday in Singapore by fulfilling the requirements of an agreement with the Singapore Economic Development Board under which certain headcount and spending requirements must be met. The tax savings due to the tax holiday for the nine months ended September 29, 2024, were $10.2 million, or $0.06 per diluted share. The tax savings due to the tax holiday for the nine months ended October 1, 2023, were $1.7 million, or $0.01 per diluted share. In November 2020, Teradyne entered into an agreement with the Singapore Economic Development Board which extended Teradyne's Singapore tax holiday under substantially similar terms to the agreement which expired on December 31, 2020. The new tax holiday is scheduled to expire on December 31, 2025.

In the nine months ended September 29, 2024, Teradyne recognized a $57.5 million gain on the sale of the Device Interface Solutions business which resulted in $10.7 million of income tax expense that was recognized as a discrete expense during the period in which the gain occurred.

On August 16, 2022, the Inflation Reduction Act of 2022 (“IRA”) was signed into law. The IRA introduced a 15% alternative minimum tax based on the financial statement income of certain large corporations (“CAMT”), effective January 1, 2023. Teradyne currently does not expect the CAMT to have a material impact on its financial results.

On December 15, 2022, the European Union ("EU") Member States formally adopted the EU’s Pillar Two Directive, which generally provides for a minimum effective tax rate of 15%, as established by the Organization for Economic Co-operation and Development ("OECD") Pillar Two Framework. The EU’s Pillar Two Directive effective dates are January 1, 2024, and January 1, 2025, for different aspects of the directive. On July 17, 2023, the OECD published Administrative Guidance proposing certain safe harbor rules that effectively extend certain effective dates to January 1, 2027. Certain EU Member States where Teradyne has a legal presence have recently enacted the directive and administrative guidance into their local tax legislation. Additionally, countries outside the EU where Teradyne has a legal presence have enacted similar language as the EU Members States in their local tax legislation. Teradyne is closely monitoring these developments and evaluating the potential financial impact on income tax expense. As of September 29, 2024, the effective tax rate was impacted by legislative changes that went into effect for Pillar Two in some of Teradyne's foreign jurisdictions, but it did not have a material impact on its financial statements.

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Segment Information

9 Months Ended

Sep. 29, 2024

Segment Reporting [Abstract]

Segment Information

T. SEGMENT INFORMATION

Teradyne has four reportable segments (Semiconductor Test, System Test, Wireless Test and Robotics). Each of the reportable segments represents an individual operating segment.

The Semiconductor Test segment includes operations related to the design, manufacturing and marketing of semiconductor test products and services. The System Test segment includes operations related to the design, manufacturing and marketing of products and services for storage and system level test, defense/aerospace instrumentation test, and circuit-board test. The Wireless Test segment includes operations related to the design, manufacturing and marketing of wireless test products and services. The Robotics segment includes operations related to the design, manufacturing and marketing of collaborative robotic arms, autonomous mobile robots, and advanced robotic control software. Each operating segment has a segment manager who is accountable to and maintains regular contract with Teradyne’s chief operating decision maker (Teradyne’s chief executive officer) to discuss operating activities, financial results, forecasts, and plans for the segment.

Teradyne evaluates performance based on several factors, of which the primary financial measure is business segment income (loss) before income taxes. The accounting policies of the business segments are the same as those described in Note B: “Accounting Policies” in Teradyne’s Annual Report on Form 10-K for the year ended December 31, 2023.

Segment information for the three and nine months ended September 29, 2024, and October 1, 2023, is as follows:

	Semiconductor Test		System Test		Robotics			Wireless Test		Segment Total		Corporate and Eliminations			Consolidated
	(in thousands)
Three Months Ended September 29, 2024
Revenues	$	542,734	$	73,312	$	88,651		$	32,601	$	737,298	$	—		$	737,298
Income (loss) before income taxes (1)(2)		163,778		12,522		(24,206	)		4,279	$	156,373		2,611		$	158,984
Total assets (3)		1,308,031		178,291		794,277			76,882	$	2,357,481		1,412,247		$	3,769,728
Three Months Ended October 1, 2023
Revenues	$	497,863	$	83,203	$	85,692		$	36,974	$	703,732	$	—		$	703,732
Income (loss) before income taxes (1)(2)		136,451		23,754		(21,812	)		9,469	$	147,862		(3,582	)	$	144,280
Total assets (3)		1,382,444		178,904		684,207			92,514	$	2,338,069		1,032,586		$	3,370,655
Nine Months Ended September 29, 2024
Revenues	$	1,497,552	$	209,435	$	266,552		$	93,457	$	2,066,996	$	—		$	2,066,996
Income (loss) before income taxes (1)(2)		401,475		36,138		(56,099	)		13,355	$	394,869		56,420		$	451,289
Total assets (3)		1,308,031		178,291		794,277			76,882	$	2,357,481		1,412,247		$	3,769,728
Nine Months Ended October 1, 2023
Revenues	$	1,387,580	$	252,106	$	246,541		$	119,472	$	2,005,699	$	—		$	2,005,699
Income (loss) before income taxes (1)(2)		361,676		67,629		(66,704	)		30,841	$	393,442		(7,675	)	$	385,767
Total assets (3)		1,382,444		178,904		684,207			92,514	$	2,338,069		1,032,586		$	3,370,655

(1)Included in Corporate and Eliminations are interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, severance charges, pension, acquisition and divestiture related fees, and an expense for the modification of outstanding equity awards.

(2)Included in income (loss) before taxes are charges related to restructuring and other, expense for the modification of outstanding equity awards, legal settlement, pension mark-to-market, and inventory charges.

(3)Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.

Included in each segment are charges and credits in the following line items in the statements of operations:

	For the Three Months  Ended				For the Nine Months  Ended
	September 29, 2024		October 1, 2023		September 29, 2024		October 1, 2023
	(in thousands)				(in thousands)
Semiconductor Test:
Cost of revenues—inventory charge	$	4,041	$	10,422	$	11,405	$	18,374
Restructuring and other—employee severance		—		1,776		1,277		5,055
System Test:
Cost of revenues—inventory charge	$	—	$	—	$	1,016	$	1,412
Restructuring and other—employee severance		—		—		—		1,124
Robotics:
Cost of revenues—legal settlement	$	3,600	$	—	$	3,600	$	—
Restructuring and other—employee severance		1,110		636		2,647		2,707
Cost of revenues—inventory charge		537		652		1,071		2,203
Wireless:
Cost of revenues—inventory charge	$	1,204	$	—	$	2,024	$	1,080
Corporate and Eliminations:
Restructuring and other—acquisition & divestiture related expenses	$	—	$	—	$	2,214	$	—
Selling and administrative —equity modification		—		—		1,469		5,889
Restructuring and other—employee severance		—		1,753		—		2,877
Restructuring and other—contract termination		—		1,511		—		1,511
Restructuring and other—other		2,437		—		2,437		1,100

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Shareholders' Equity

9 Months Ended

Sep. 29, 2024

Equity [Abstract]

Shareholders' Equity

U. SHAREHOLDERS’ EQUITY

Stock Repurchase Program

In January 2023, Teradyne’s Board of Directors cancelled its January 2021 repurchase program and approved a new repurchase program for up to $2.0 billion of common stock. As of January 1, 2023, share repurchases in excess of issuances are subject to a 1% excise tax, which is included as part of the cost basis of the shares acquired. In 2024, Teradyne intends, based on market conditions, to

repurchase its common stock in an amount necessary to offset dilution from equity compensation and our employee share purchase program.

During the nine months ended September 29, 2024, Teradyne repurchased 0.5 million shares of common stock for a total cost of $55.1 million at an average price of $111.32 per share. The cumulative repurchases under the January 2023 repurchase program as of September 29, 2024, were 4.4 million shares of common stock for $455.6 million at an average price per share of $103.46.

During the nine months ended October 1, 2023, Teradyne repurchased 3.4 million shares of common stock for a total cost of $349.3 million at an average price of $103.89 per share.

The total cost of shares acquired includes commissions and related excise tax and is recorded as a reduction to retained earnings.

Dividend

Holders of Teradyne’s common stock are entitled to receive dividends when they are declared by Teradyne’s Board of Directors.

In January 2024, May 2024, and August 2024, Teradyne’s Board of Directors declared a quarterly cash dividend of $0.12 per share. Dividend payments for the three and nine months ended September 29, 2024, were $19.6 million and $57.0 million, respectively.

In January 2023, May 2023, and August 2023, Teradyne’s Board of Directors declared a quarterly cash dividend of $0.11 per share. Dividend payments for the three and nine months ended October 1, 2023, were $16.9 million and $51.1 million, respectively.

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Accounting Policies (Policies)

9 Months Ended

Sep. 29, 2024

Basis of Presentation

Basis of Presentation

The consolidated interim financial statements include the accounts of Teradyne and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated. These interim financial statements are unaudited and reflect all normal recurring adjustments that are, in the opinion of management, necessary for the fair statement of such interim financial statements. The December 31, 2023, condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by United States of America generally accepted accounting principles (“U.S. GAAP”) for complete financial statements. The accompanying financial information should be read in conjunction with the consolidated financial statements and notes thereto contained in Teradyne’s Annual Report on Form 10-K, filed with the U.S. Securities and Exchange Commission (“SEC”) on February 22, 2024, for the year ended December 31, 2023.

Preparation of Financial Statements and Use of Estimates

Preparation of Financial Statements and Use of Estimates

The preparation of consolidated financial statements requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent liabilities. On an on-going basis, management evaluates its estimates, including those related to inventories, investments, goodwill, intangible and other long-lived assets, accounts receivable, income taxes, deferred tax assets and liabilities, pensions, warranties, contingent consideration liabilities, and loss contingencies. Management bases its estimates on historical experience and on appropriate and customary assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Management is not aware of any specific event or circumstance that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities as of the date of issuance of this Quarterly Report on Form 10-Q. These estimates may change, as new events occur, and additional information is obtained. Actual results may differ significantly from these estimates under different assumptions or conditions.

Equity Method Investments

Equity Method Investments

Teradyne accounts for investments using the equity method of accounting when it has significant influence over the financial and operating policies, but not control, of the investee. The equity method investments are initially recorded at cost and included in ‘Equity method investment’ in the consolidated balance sheet. Teradyne records its share of investee's net income or loss and other comprehensive income, and the amortization of equity method basis difference, calculated as the difference between the investment and the amount of underlying equity in net assets acquired, on a 3-month lag, which is applied consistently from period to period. Teradyne's share of investee's net income and the amortization of equity method basis difference are reported in ‘Equity in net earnings of affiliate’ in the consolidated statement of operations. Teradyne includes its share of investee's other comprehensive income

and a cumulative translation adjustment in the consolidated statements of comprehensive income. Teradyne monitors on an ongoing basis its equity method investments for indicators of other-than-temporary declines in fair value below carrying value.

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Revenue (Tables)

9 Months Ended

Sep. 29, 2024

Revenue from Contract with Customer [Abstract]

Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition

The following table provides information about disaggregated revenue by timing of revenue recognition, primary geographical market, and major product lines.

		Semiconductor Test				System Test		Robotics				Wireless Test
		System on-a-Chip		Memory				Universal Robots		Mobile Industrial Robots				Total
	(in thousands)
For the Three Months Ended September 29, 2024 (1)
Timing of Revenue Recognition
Point in Time		$	323,507	$	143,581	$	55,611	$	71,607	$	15,065	$	29,465	$	638,836
Over Time			68,848		6,798		17,701		1,811		168		3,136		98,462
Total		$	392,355	$	150,379	$	73,312	$	73,418	$	15,233	$	32,601	$	737,298
Geographical Market
Asia Pacific		$	364,476	$	137,890	$	29,277	$	10,873	$	2,960	$	24,342	$	569,818
Americas			17,150		1,325		39,919		32,315		8,460		5,515		104,684
Europe, Middle East and Africa			10,729		11,164		4,116		30,230		3,813		2,744		62,796
Total		$	392,355	$	150,379	$	73,312	$	73,418	$	15,233	$	32,601	$	737,298
For the Three Months Ended October 1, 2023 (1)
Timing of Revenue Recognition
Point in Time		$	330,846	$	86,247	$	66,418	$	68,938	$	14,012	$	32,638	$	599,099
Over Time			73,264		7,506		16,785		1,607		1,135		4,336		104,633
Total		$	404,110	$	93,753	$	83,203	$	70,545	$	15,147	$	36,974	$	703,732
Geographical Market
Asia Pacific		$	360,375	$	91,352	$	40,464	$	15,430	$	3,180	$	24,727	$	535,528
Americas			24,752		1,356		35,888		26,073		7,154		10,139		105,362
Europe, Middle East and Africa			18,983		1,045		6,851		29,042		4,813		2,108		62,842
Total		$	404,110	$	93,753	$	83,203	$	70,545	$	15,147	$	36,974	$	703,732
For the Nine Months Ended September 29, 2024 (2)
Timing of Revenue Recognition
Point in Time		$	896,635	$	367,679	$	157,203	$	210,222	$	49,850	$	82,652	$	1,764,241
Over Time			211,612		21,626		52,232		5,542		938		10,805		302,755
Total		$	1,108,247	$	389,305	$	209,435	$	215,764	$	50,788	$	93,457	$	2,066,996
Geographical Market
Asia Pacific		$	1,016,674	$	357,993	$	76,317	$	37,254	$	11,361	$	70,776	$	1,570,375
Americas			59,912		13,631		105,197		82,220		28,195		16,240		305,395
Europe, Middle East and Africa			31,661		17,681		27,921		96,290		11,232		6,441		191,226
Total		$	1,108,247	$	389,305	$	209,435	$	215,764	$	50,788	$	93,457	$	2,066,996
For the Nine Months Ended October 1, 2023 (2)
Timing of Revenue Recognition
Point in Time		$	886,201	$	260,052	$	200,076	$	194,698	$	42,748	$	108,262	$	1,692,038
Over Time			219,436		21,890		52,030		5,731		3,364		11,210		313,661
Total		$	1,105,638	$	281,942	$	252,106	$	200,429	$	46,112	$	119,472	$	2,005,699
Geographical Market
Asia Pacific		$	946,696	$	270,297	$	121,698	$	43,530	$	6,973	$	70,320	$	1,459,514
Americas			98,511		8,586		105,031		69,346		25,051		42,476		349,001
Europe, Middle East and Africa			60,431		3,059		25,377		87,553		14,088		6,676		197,184
Total		$	1,105,638	$	281,942	$	252,106	$	200,429	$	46,112	$	119,472	$	2,005,699

(1)Includes $0.8 million and $1.4 million in 2024, and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

(2)Includes $2.5 million and $3.9 million in 2024 and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

Deferred Revenue and Customer Advances

Deferred revenue and customer advances consist of the following and are included in short and long-term deferred revenue and customer advances on the balance sheet:

	September 29, 2024		December 31, 2023
	(in thousands)
Maintenance, service and training	$	57,866	$	66,458
Customer advances, undelivered elements and other		44,116		35,731
Extended warranty		38,929		34,897
Total deferred revenue and customer advances	$	140,911	$	137,086

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Dispositions (Tables)

9 Months Ended

Sep. 29, 2024

Device Interface Solutions [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Schedule of Assets and Liabilities Related to the DIS Sale Agreement

Assets and liabilities related to the DIS sale agreement met the criteria and were classified as held for sale in Teradyne’s consolidated balance sheet as of December 31, 2023, as follows:

	December 31, 2023
Current assets:
Inventories, net	$	17,952
Prepayments		5,298
Total current assets held for sale		23,250
Property, plant and equipment, net		8,986
Operating lease right-of-use assets, net		2,545
Total assets held for sale	$	34,781
Current liabilities:
Accounts payable	$	6,356
Other accrued liabilities		552
Operating lease liabilities		471
Total current liabilities held for sale		7,379
Long-term operating lease liabilities		2,000
Total liabilities held for sale	$	9,379
Net assets held for sale	$	25,402

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Equity Method Investment (Tables)

9 Months Ended

Sep. 29, 2024

Equity Method Investments and Joint Ventures [Abstract]

Summary of Equity Method Investment

	(in thousands)
Balance at June 30, 2024	$	524,060
Other comprehensive income related to investment		15,366
Equity in net earnings of affiliate		(1,075	)
Balance at September 29, 2024	$	538,351

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Inventories (Tables)

9 Months Ended

Sep. 29, 2024

Composition of Inventories, Net

Inventories, net consisted of the following at September 29, 2024, and December 31, 2023:

	September 29, 2024		December 31, 2023
	(in thousands)
Raw material	$	216,019	$	258,422
Work-in-process		48,249		26,851
Finished goods		33,072		24,701
Total inventories, net (1)	$	297,340	$	309,974

(1)Inventories, net at December 31, 2023, exclude $18.0 million of primarily work-in-process inventories, net classified as assets held for sale. See Note E: "Dispositions" for additional information.

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Financial Instruments (Tables)

9 Months Ended

Sep. 29, 2024

Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis

The following tables set forth by fair value hierarchy Teradyne’s financial assets and liabilities that were measured at fair value on a recurring basis as of September 29, 2024, and December 31, 2023.

	September 29, 2024
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in thousands)
Assets
Cash	$	198,946	$	—	$	—	$	198,946
Cash equivalents		308,000		3,090		—		311,090
Available-for-sale securities:
U.S. Treasury securities		—		41,833		—		41,833
Corporate debt securities		—		37,149		—		37,149
Certificates of deposit and time deposits		—		21,741		—		21,741
Debt mutual funds		8,640		—		—		8,640
U.S. government agency securities		—		3,931		—		3,931
Non-U.S. government securities		—		801		—		801
Equity securities:
Mutual funds		53,480		—		—		53,480
	$	569,066	$	108,545	$	—	$	677,611
Derivative assets		—		332		—		332
Total	$	569,066	$	108,877	$	—	$	677,943
Liabilities
Derivative liabilities		—		1,435		—	$	1,435
Total	$	—	$	1,435	$	—	$	1,435
Reported as follows:
	(Level 1)		(Level 2)		(Level 3)		Total
	(in thousands)
Assets
Cash and cash equivalents	$	506,946	$	3,090	$	—	$	510,036
Marketable securities		—		41,631		—		41,631
Long-term marketable securities		62,120		63,824		—		125,944
Other current assets		—		332		—		332
Total	$	569,066	$	108,877	$	—	$	677,943
Liabilities
Other current liabilities		—		1,435		—		1,435
Total	$	—	$	1,435	$	—	$	1,435

	December 31, 2023
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in thousands)
Assets
Cash	$	298,156	$	—	$	—	$	298,156
Cash equivalents		453,298		6,117		—		459,415
Available-for-sale securities:
Corporate debt securities		—		52,734		—		52,734
U.S. Treasury securities		—		41,808		—		41,808
Certificates of deposit and time deposits		—		21,772		—		21,772
Debt mutual funds		8,773		—		—		8,773
U.S. government agency securities		—		4,892		—		4,892
Commercial paper		—		1,667		—		1,667
Non-U.S. government securities		—		810		—		810
Equity securities:
Mutual Funds		47,132		—		—		47,132
	$	807,359	$	129,800	$	—	$	937,159
Derivative assets		—		18,746		—		18,746
Total	$	807,359	$	148,546	$	—	$	955,905
Liabilities
Derivative liabilities		—		2,545		—		2,545
Total	$	—	$	2,545	$	—	$	2,545
Reported as follows:
	(Level 1)		(Level 2)		(Level 3)		Total
	(in thousands)
Assets
Cash and cash equivalents	$	751,454	$	6,117	$	—	$	757,571
Marketable securities		—		62,154		—		62,154
Long-term marketable securities		55,905		61,529		—		117,434
Other current assets		—		18,746		—		18,746
Total	$	807,359	$	148,546	$	—	$	955,905
Liabilities
Other current liabilities	$	—	$	2,545	$	—	$	2,545
Total	$	—	$	2,545	$	—	$	2,545

Schedule of Carrying Amounts and Fair Values of Financial Instruments

The carrying amounts and fair values of Teradyne’s financial instruments at September 29, 2024, and December 31, 2023, were as follows:

	September 29, 2024				December 31, 2023
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Assets
Cash and cash equivalents	$	510,036	$	510,036	$	757,571	$	757,571
Marketable securities		167,575		167,575		179,588		179,588
Derivative assets		332		332		18,746		18,746
Liabilities
Derivative liabilities		1,435		1,435		2,545		2,545

Schedule of Available-for-Sale Marketable Securities

The following table summarizes the composition of available-for-sale marketable securities at September 29, 2024:

	September 29, 2024
	Available-for-Sale
	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
U.S. Treasury securities	$	45,522	$	106	$	(3,795	)	$	41,833	$	22,985
Corporate debt securities	$	39,986	$	323	$	(3,160	)	$	37,149	$	25,248
Certificates of deposit and time deposits		21,741		—		—			21,741		—
Debt mutual funds		8,846		—		(206	)		8,640		3,319
U.S. government agency securities		3,921		11		(1	)		3,931		876
Non-U.S. government securities		801		—		—			801		—
	$	120,817	$	440	$	(7,162	)	$	114,095	$	52,428

Reported as follows:

	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Marketable securities	$	41,673		20	$	(62	)	$	41,631	$	9,973
Long-term marketable securities		79,144		420		(7,100	)		72,464		42,455
	$	120,817	$	440	$	(7,162	)	$	114,095	$	52,428

The following table summarizes the composition of available-for-sale marketable securities at December 31, 2023:

	December 31, 2023
	Available-for-Sale
	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Corporate debt securities	$	56,458	$	201	$	(3,925	)	$	52,734	$	44,263
U.S. Treasury securities		45,725		14		(3,931	)		41,808		35,080
Certificates of deposit and time deposits		21,772		—		—			21,772		—
Debt mutual funds		9,081		—		(308	)		8,773		3,303
U.S. government agency securities		4,898		—		(6	)		4,892		4,892
Commercial paper		1,633		34		—			1,667		—
Non-U.S. government securities		810		—		—			810		—
	$	140,377	$	249	$	(8,170	)	$	132,456	$	87,538

Reported as follows:

	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Marketable securities	$	62,385	$	36	$	(267	)		62,154	$	34,844
Long-term marketable securities		77,992		213		(7,903	)		70,302		52,694
	$	140,377	$	249	$	(8,170	)	$	132,456	$	87,538

Contractual Maturities of Investments Held

The contractual maturities of investments in available-for-sale securities held at September 29, 2024, were as follows:

	September 29, 2024
	Cost		Fair Market Value
	(in thousands)
Due within one year	$	41,673	$	41,631
Due after 1 year through 5 years		25,690		25,729
Due after 5 years through 10 years		7,950		7,908
Due after 10 years		36,658		30,187
Total	$	111,971	$	105,455

Schedule of Notional Amount of Derivatives

At September 29, 2024, and December 31, 2023, Teradyne had the following contracts to buy and sell non-U.S. currencies for U.S. dollars and other non-U.S. currencies with the following notional amounts:

	Net Notional Value
	September 29, 2024		December 31, 2023
	(in millions)
Currency Hedged (Buy/Sell)
U.S. dollar/Taiwan dollar		29.6		42.7
U.S. dollar/Japanese yen		21.7		11.0
U.S. dollar/Korean won		8.9		7.2
U.S. dollar/British pound sterling		1.0		1.5
U.S. dollar/Danish krone		—		36.0
Danish krone/U.S. dollar		25.7		0.7
Euro/U.S. dollar		24.8		25.3
Singapore dollar/U.S. dollar		23.0		16.6
Philippine peso/U.S. dollar		9.7		10.1
Chinese yuan/U.S. dollar		1.7		1.0
Total	$	146.1	$	152.1

Schedule of Foreign Currency Cash Flow Hedges

At September 29, 2024, and December 31, 2023, Teradyne had the following cash flow hedge contracts to buy and sell non-U.S. currencies for U.S. dollars with the following notional amounts:

	Net Notional Value
	September 29, 2024		December 31, 2023
	(in millions)
Currency Hedged (Buy/Sell)
U.S. dollar/Japanese yen	$	12.1	$	35.5
Total	$	12.1	$	35.5

Schedule of Derivative Instruments in Statement of Financial Position at Fair Value

The following table summarizes the fair value of derivative instruments as of September 29, 2024, and December 31, 2023:

	Balance Sheet Location	September 29, 2024			December 31, 2023
		(in thousands)
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts	Other current assets		332			733
Foreign exchange forward contracts	Other current liabilities		(1,102	)		(2,545	)
Foreign exchange option contracts	Other current assets		—			17,364
Derivatives designated as hedging instruments:
Foreign exchange forward contracts	Other current assets		—			648
Foreign exchange forward contracts	Other current liabilities		(333	)		—
Total derivatives		$	(1,103	)	$	16,200

Schedule of Effect of Derivative Instruments on Statement of Operations Recognized

The following table summarizes the effect of derivative instruments recognized in the statement of operations for the three and nine months ended September 29, 2024, and October 1, 2023:

		For the Three Months  Ended					For the Nine Months  Ended
	Location of (Gains) Losses Recognized in Statement of Operations	September 29, 2024		October 1, 2023			September 29, 2024			October 1, 2023
		(in thousands)					(in thousands)
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts (1)	Other (income) expense, net	$	4,829	$	(1,886	)	$	686		$	(4,667	)
Foreign exchange option contracts	Other (income) expense, net		—		—			9,764			—
Derivatives designated as hedging instruments:
Foreign exchange forward and option contracts	Revenue		—		(3,960	)		(2,280	)		(2,008	)
Total Derivatives		$	4,829	$	(5,846	)	$	8,170		$	(6,675	)

(1)The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies. For the three and nine months ended September 29, 2024, net losses (gains) from remeasurement of monetary assets and liabilities denominated in foreign currencies were $(2.9) million and $3.1 million, respectively. For the three and nine months ended October 1, 2023, net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $5.3 million and $12.3 million, respectively.

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Debt (Tables)

9 Months Ended

Sep. 29, 2024

Schedule of Interest Expense on Teradyne's Senior Notes

The interest expense on Teradyne's senior notes for three and nine months ended October 1, 2023, was as follows:

	For the Three Months  Ended				For the Nine Months  Ended
	September 29, 2024		October 1, 2023		September 29, 2024		October 1, 2023
	(in thousands)				(in thousands)
Contractual interest expense on the coupon	$	—	$	74	$	—	$	312
Amortization of debt issuance fees recognized as interest expense		—		—		—		113
Total interest expense on the convertible debt	$	—	$	74	$	—	$	425

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Prepayments (Tables)

9 Months Ended

Sep. 29, 2024

Prepayments [Abstract]

Schedule of Prepayments and other assets

Prepayments consist of the following:

	September 29, 2024		December 31, 2023
	(in thousands)
Contract manufacturer and supplier prepayments	$	439,647	$	502,257
Prepaid taxes		20,734		16,083
Prepaid maintenance and other services		19,040		17,592
Other prepayments		10,127		13,038
Total prepayments (1)	$	489,548	$	548,970

(1)Excludes $5.3 million at December 31, 2023, of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: “Dispositions” for additional information.

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Product Warranty (Tables)

9 Months Ended

Sep. 29, 2024

Other Accrued Liabilities

Related costs are charged to the warranty accrual as incurred. The balance below is included in other accrued liabilities.

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
	(in thousands)						(in thousands)
Balance at beginning of period	$	15,244		$	12,543		$	15,698		$	14,181
Accruals for warranties issued during the period		2,149			8,859			8,331			16,237
Accruals related to pre-existing warranties		(545	)		(795	)		(1,513	)		(1,552	)
Settlements made during the period		(2,990	)		(5,892	)		(8,658	)		(14,151	)
Balance at end of period	$	13,858		$	14,715		$	13,858		$	14,715

Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances

Related costs are expensed as incurred. The balance below is included in short and long-term deferred revenue and customer advances.

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
	(in thousands)						(in thousands)
Balance at beginning of period	$	33,512		$	44,422		$	34,897		$	56,180
Deferral of new extended warranty revenue		9,714			2,734			22,316			11,615
Recognition of extended warranty deferred revenue		(4,297	)		(8,313	)		(18,284	)		(28,952	)
Balance at end of period	$	38,929		$	38,843		$	38,929		$	38,843

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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 29, 2024

Schedule of Estimated Fair Value of TSR Performance-Based Restricted Stock Unit Awards Assumptions

The grant date fair value was estimated using the Monte Carlo simulation model with the following assumptions:

	For the Nine Months  Ended
	September 29, 2024			October 1, 2023
Risk-free interest rate		3.9	%		4.0	%
Teradyne volatility-historical		42.4	%		49.7	%
NYSE Composite Index volatility-historical		15.6	%		24.1	%
Dividend yield		0.5	%		0.4	%

Fair Value of Stock Options Using Assumptions

The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions:

	For the Nine Months  Ended
	September 29, 2024			October 1, 2023
Expected life (years)		4.0			4.0
Risk-free interest rate		4.0	%		3.8	%
Volatility-historical		46.3	%		46.6	%
Dividend yield		0.5	%		0.4	%

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Accumulated Other Comprehensive Income (Loss) (Tables)

9 Months Ended

Sep. 29, 2024

Changes in Accumulated Other Comprehensive Income (Loss)

Changes in accumulated other comprehensive income (loss), which are presented net of tax, consist of the following:

	Foreign Currency Translation Adjustment			Unrealized (Losses) Gains on Marketable Securities			Unrealized (Losses) Gains on Cash Flow Hedges			Retirement Plans Prior Service Credit			Total
	(in thousands)
Nine Months Ended September 29, 2024
Balance at December 31, 2023, net of tax of $0, $(1,728), $142, $(1,132), respectively	$	(22,442	)	$	(6,194	)	$	506		$	1,152		$	(26,978	)
Other comprehensive (loss) gain before reclassifications, net of tax of $0, $205, $285, $0, respectively		22,751			885			1,014			—			24,650
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of $0, $24, $(500), $(1), respectively		—			86			(1,780	)		(6	)		(1,700	)
Net current period other comprehensive (loss) gain, net of tax of $0, $229, $(215), $(1), respectively		22,751			971			(766	)		(6	)		22,950
Balance at September 29, 2024, net of tax of $0, $(1,499), $(73), $(1,133), respectively	$	309		$	(5,223	)	$	(260	)	$	1,146		$	(4,028	)
Nine Months Ended October 1, 2023
Balance at December 31, 2022, net of tax of $0, $(2,308), $(708), $(1,130), respectively	$	(39,849	)	$	(8,661	)	$	(2,517	)	$	1,159		$	(49,868	)
Other comprehensive (loss) gain before reclassifications, net of tax of $0, $(408), $1,816, $0, respectively		(2,073	)		(903	)		6,456			—			3,480
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of $0, $9, $(441), $(1), respectively		—			33			(1,567	)		(6	)		(1,540	)
Net current period other comprehensive (loss) gain, net of tax of $0, $(399), $1,375, $(1), respectively		(2,073	)		(870	)		4,889			(6	)		1,940
Balance at October 1, 2023, net of tax of $0, $(2,707), $667, $(1,131), respectively	$	(41,922	)	$	(9,531	)	$	2,372		$	1,153		$	(47,928	)

Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations

Reclassifications out of accumulated other comprehensive income (loss) to the statement of operations for the three and nine months ended September 29, 2024, and October 1, 2023, were as follows:

Details about Accumulated Other Comprehensive Income (Loss) Components	For the Three Months  Ended				For the Nine Months  Ended						Affected Line Item in the Statements of Operations
	September 29, 2024		October 1, 2023		September 29, 2024			October 1, 2023
	(in thousands)				(in thousands)
Available-for-sale marketable securities:
Unrealized (losses) gains, net of tax of $2, $0, $(24), $(9), respectively	$	7	$	—	$	(86	)	$	(33	)	Other (income) expense, net
Cash flow hedges:
Unrealized (losses) gains, net of tax of $0, $869, $500, $441, respectively		—		3,091		1,780			1,567		Revenue
Defined benefit pension and postretirement plans:
Amortization of prior service credit, net of tax of $0, $0, $1, $1, respectively		2		2		6			6		(a)
Total reclassifications, net of tax of $2, $869, $477, $433 respectively	$	9	$	3,093	$	1,700		$	1,540		Net income

(a)The amortization of prior service credit is included in the computation of net periodic postretirement benefit cost. See Note Q: “Retirement Plans.”

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Goodwill and Acquired Intangible Assets (Tables)

9 Months Ended

Sep. 29, 2024

Changes in Carrying Amount of Goodwill by Segment

The changes in the carrying amount of goodwill by reportable segments for the nine months ended September 29, 2024, were as follows:

	Robotics		Wireless Test			Semiconductor Test			System Test			Total
	(in thousands)
Balance at December 31, 2023
Goodwill	$	395,463	$	361,819		$	262,237		$	158,699		$	1,178,218
Accumulated impairment losses		—		(353,843	)		(260,540	)		(148,183	)		(762,566	)
Total Goodwill		395,463		7,976			1,697			10,516			415,652
Foreign currency translation adjustment		3,765		—			(5	)		—			3,760
Balance at September 29, 2024
Goodwill	$	399,229	$	361,819		$	262,232		$	158,699			1,181,978
Accumulated impairment losses		—		(353,843	)		(260,540	)		(148,183	)		(762,566	)
Total Goodwill	$	399,229	$	7,976		$	1,692		$	10,516		$	419,412

Schedule of Amortizable Intangible Assets

Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet:

	Gross Carrying Amount		Accumulated Amortization			Foreign Currency Translation Adjustment			Net Carrying Amount
	(in thousands)
Balance at September 29, 2024
Developed technology	$	267,706	$	(252,406	)	$	(5,337	)	$	9,963
Customer relationships		52,109		(49,134	)		210			3,185
Tradenames and trademarks		59,007		(49,618	)		(1,249	)		8,140
Total intangible assets	$	378,822	$	(351,158	)	$	(6,376	)	$	21,288
Balance at December 31, 2023
Developed technology	$	267,706	$	(243,191	)	$	(5,343	)	$	19,172
Customer relationships		52,109		(47,850	)		232			4,491
Tradenames and trademarks		59,007		(46,021	)		(1,245	)		11,741
Total intangible assets	$	378,822	$	(337,062	)	$	(6,356	)	$	35,404

Schedule of Estimated Intangible Assets Amortization Expense

Estimated intangible asset amortization expense for each of the five succeeding fiscal years and thereafter is as follows:

Year	Amortization Expense
	(in thousands)
2024	$	4,775
2025		11,454
2026		2,402
2027		1,185
2028		1,104
Thereafter		368

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Net Income Per Common Share (Tables)

9 Months Ended

Sep. 29, 2024

Computation of Basic and Diluted Net Income (Loss) Per Common Share

The following table sets forth the computation of basic and diluted net income per common share:

	For the Three Months  Ended				For the Nine Months  Ended
	September 29, 2024		October 1, 2023		September 29, 2024		October 1, 2023
	(in thousands, except per share amounts)				(in thousands, except per share amounts)
Net income for basic and diluted net income per share	$	145,649	$	128,116	$	396,119	$	331,698
Weighted average common shares-basic		163,002		153,762		157,951		154,809
Effect of dilutive potential common shares:
Restricted stock units		768		455		637		410
Convertible note hedge warrant shares (1)		460		9,168		4,751		9,009
Stock options		13		26		13		39
Employee stock purchase plan		10		10		5		8
Incremental shares from assumed conversion of convertible notes (2)		—		629		—		762
Dilutive potential common shares		1,251		10,288		5,406		10,228
Weighted average common shares-diluted		164,253		164,050		163,357		165,037
Net income per common share-basic	$	0.89	$	0.83	$	2.51	$	2.14
Net income per common share-diluted	$	0.89	$	0.78	$	2.42	$	2.01

(1)Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price, multiplied by the number of warrant shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period.

(2)Incremental shares from assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible notes, was divided by the average Teradyne stock price for the period.

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Retirement Plans (Tables)

9 Months Ended

Sep. 29, 2024

Defined Benefit Pension Plans

Net Periodic Pension and Postretirement Benefit Costs

For the three and nine months ended September 29, 2024, and October 1, 2023, Teradyne’s net periodic pension cost was comprised of the following:

	For the Three Months Ended
	September 29, 2024						October 1, 2023
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	216		$	119		$	272		$	107
Interest cost		1,590			256			1,713			253
Expected return on plan assets		(1,204	)		(23	)		(1,286	)		(11	)
Net actuarial loss (gain)		(2,262	)		—			—			66
Settlement expense		394			—			—			5
Total net periodic pension cost	$	(1,266	)	$	352		$	699		$	420

	For the Nine Months Ended
	September 29, 2024						October 1, 2023
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	665		$	360		$	815		$	320
Interest cost		4,883			766			5,138			762
Expected return on plan assets		(3,737	)		(58	)		(3,856	)		(28	)
Net actuarial loss (gain)		(2,151	)		(242	)		24			66
Settlement expense		394			(24	)		—			5
Total net periodic pension cost	$	54		$	802		$	2,121		$	1,125

Postretirement Benefit Plans

Net Periodic Pension and Postretirement Benefit Costs

For the three and nine months ended September 29, 2024, and October 1, 2023, Teradyne’s net periodic postretirement benefit cost was comprised of the following:

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
	(in thousands)						(in thousands)
Service cost	$	9		$	9		$	28		$	26
Interest cost		72			60			217			181
Amortization of prior service credit		(2	)		(2	)		(7	)		(7	)
Special termination benefits		—			1,423			462			1,792
Net actuarial loss (gain)		—			—			(94	)		30
Total net periodic postretirement benefit cost	$	79		$	1,490		$	606		$	2,022

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Income Taxes (Tables)

9 Months Ended

Sep. 29, 2024

Reconciliation of Effective Tax Rate

A reconciliation of the United States federal statutory corporate tax rate to Teradyne’s effective tax rate was as follows:

	For the Three Months  Ended						For the Nine Months  Ended
	September 29, 2024			October 1, 2023			September 29, 2024			October 1, 2023
U.S. statutory federal tax rate		21.0	%		21.0	%		21.0	%		21.0	%
Non-deductible officers' compensation		0.5			1.3			0.4			1.1
Tax credits		(5.0	)		(9.3	)		(3.6	)		(5.0	)
Discrete expense (benefit) related to reserves for uncertain tax positions		(4.9	)		0.3			(2.2	)		0.1
Foreign taxes		(4.9	)		(1.5	)		(3.3	)		(1.1	)
International provisions of the U.S. Tax Cuts and Jobs Act of 2017		(0.8	)		(3.1	)		(1.1	)		(2.9	)
Other, net		1.9			2.5			0.8			0.8
Effective tax rate		7.8	%		11.2	%		12.0	%		14.0	%

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Segment Information (Tables)

9 Months Ended

Sep. 29, 2024

Segment Information

Segment information for the three and nine months ended September 29, 2024, and October 1, 2023, is as follows:

	Semiconductor Test		System Test		Robotics			Wireless Test		Segment Total		Corporate and Eliminations			Consolidated
	(in thousands)
Three Months Ended September 29, 2024
Revenues	$	542,734	$	73,312	$	88,651		$	32,601	$	737,298	$	—		$	737,298
Income (loss) before income taxes (1)(2)		163,778		12,522		(24,206	)		4,279	$	156,373		2,611		$	158,984
Total assets (3)		1,308,031		178,291		794,277			76,882	$	2,357,481		1,412,247		$	3,769,728
Three Months Ended October 1, 2023
Revenues	$	497,863	$	83,203	$	85,692		$	36,974	$	703,732	$	—		$	703,732
Income (loss) before income taxes (1)(2)		136,451		23,754		(21,812	)		9,469	$	147,862		(3,582	)	$	144,280
Total assets (3)		1,382,444		178,904		684,207			92,514	$	2,338,069		1,032,586		$	3,370,655
Nine Months Ended September 29, 2024
Revenues	$	1,497,552	$	209,435	$	266,552		$	93,457	$	2,066,996	$	—		$	2,066,996
Income (loss) before income taxes (1)(2)		401,475		36,138		(56,099	)		13,355	$	394,869		56,420		$	451,289
Total assets (3)		1,308,031		178,291		794,277			76,882	$	2,357,481		1,412,247		$	3,769,728
Nine Months Ended October 1, 2023
Revenues	$	1,387,580	$	252,106	$	246,541		$	119,472	$	2,005,699	$	—		$	2,005,699
Income (loss) before income taxes (1)(2)		361,676		67,629		(66,704	)		30,841	$	393,442		(7,675	)	$	385,767
Total assets (3)		1,382,444		178,904		684,207			92,514	$	2,338,069		1,032,586		$	3,370,655

(1)Included in Corporate and Eliminations are interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, severance charges, pension, acquisition and divestiture related fees, and an expense for the modification of outstanding equity awards.

(2)Included in income (loss) before taxes are charges related to restructuring and other, expense for the modification of outstanding equity awards, legal settlement, pension mark-to-market, and inventory charges.

(3)Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.

Schedule of Segment Reporting Information by Segment Charges

Included in each segment are charges and credits in the following line items in the statements of operations:

	For the Three Months  Ended				For the Nine Months  Ended
	September 29, 2024		October 1, 2023		September 29, 2024		October 1, 2023
	(in thousands)				(in thousands)
Semiconductor Test:
Cost of revenues—inventory charge	$	4,041	$	10,422	$	11,405	$	18,374
Restructuring and other—employee severance		—		1,776		1,277		5,055
System Test:
Cost of revenues—inventory charge	$	—	$	—	$	1,016	$	1,412
Restructuring and other—employee severance		—		—		—		1,124
Robotics:
Cost of revenues—legal settlement	$	3,600	$	—	$	3,600	$	—
Restructuring and other—employee severance		1,110		636		2,647		2,707
Cost of revenues—inventory charge		537		652		1,071		2,203
Wireless:
Cost of revenues—inventory charge	$	1,204	$	—	$	2,024	$	1,080
Corporate and Eliminations:
Restructuring and other—acquisition & divestiture related expenses	$	—	$	—	$	2,214	$	—
Selling and administrative —equity modification		—		—		1,469		5,889
Restructuring and other—employee severance		—		1,753		—		2,877
Restructuring and other—contract termination		—		1,511		—		1,511
Restructuring and other—other		2,437		—		2,437		1,100

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Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Trade Accounts Receivable	$ 36.1	$ 94.1	$ 116.8	$ 191.2
Deferred Revenue And Customer Advances	13.4	$ 21.9	60.2	$ 91.3
Revenue, Remaining Performance Obligation, Amount	$ 1,045.4		$ 1,045.4
Short-term Contract with Customer [Member]
Revenue, Remaining Performance Obligation, Percentage	93.00%		93.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period			12 months
Long-term Contract with Customer [Member] | Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period			3 years
Long-term Contract with Customer [Member] | Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period			1 year

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Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 29, 2024	[1]	Oct. 01, 2023		Sep. 29, 2024	[2]	Oct. 01, 2023
Disaggregation of Revenue [Line Items]
Total	$ 737,298		$ 703,732	[1]	$ 2,066,996		$ 2,005,699	[2]
System Test
Disaggregation of Revenue [Line Items]
Total	73,312		83,203	[1]	209,435		252,106	[2]
Wireless Test
Disaggregation of Revenue [Line Items]
Total	32,601		36,974	[1]	93,457		119,472	[2]
Point in Time
Disaggregation of Revenue [Line Items]
Total	638,836		599,099	[1]	1,764,241		1,692,038	[2]
Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total	55,611		66,418	[1]	157,203		200,076	[2]
Point in Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	29,465		32,638	[1]	82,652		108,262	[2]
Over Time
Disaggregation of Revenue [Line Items]
Total	98,462		104,633	[1]	302,755		313,661	[2]
Over Time | System Test
Disaggregation of Revenue [Line Items]
Total	17,701		16,785	[1]	52,232		52,030	[2]
Over Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	3,136		4,336	[1]	10,805		11,210	[2]
Asia Pacific
Disaggregation of Revenue [Line Items]
Total	569,818		535,528	[1]	1,570,375		1,459,514	[2]
Asia Pacific | System Test
Disaggregation of Revenue [Line Items]
Total	29,277		40,464	[1]	76,317		121,698	[2]
Asia Pacific | Wireless Test
Disaggregation of Revenue [Line Items]
Total	24,342		24,727	[1]	70,776		70,320	[2]
Americas
Disaggregation of Revenue [Line Items]
Total	104,684		105,362	[2]	305,395		349,001	[1]
Americas | System Test
Disaggregation of Revenue [Line Items]
Total	39,919		35,888	[2]	105,197		105,031	[1]
Americas | Wireless Test
Disaggregation of Revenue [Line Items]
Total	5,515		10,139	[2]	16,240		42,476	[1]
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total	62,796		62,842	[1]	191,226		197,184	[2]
Europe, Middle East and Africa | System Test
Disaggregation of Revenue [Line Items]
Total	4,116		6,851	[1]	27,921		25,377	[2]
Europe, Middle East and Africa | Wireless Test
Disaggregation of Revenue [Line Items]
Total	2,744		2,108	[1]	6,441		6,676	[2]
SOC | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	392,355		404,110	[1]	1,108,247		1,105,638	[2]
SOC | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	323,507		330,846	[1]	896,635		886,201	[2]
SOC | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	68,848		73,264	[1]	211,612		219,436	[2]
SOC | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	364,476		360,375	[1]	1,016,674		946,696	[2]
SOC | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	17,150		24,752	[2]	59,912		98,511	[1]
SOC | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	10,729		18,983	[1]	31,661		60,431	[2]
Memory | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	150,379		93,753	[1]	389,305		281,942	[2]
Memory | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	143,581		86,247	[1]	367,679		260,052	[2]
Memory | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	6,798		7,506	[1]	21,626		21,890	[2]
Memory | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	137,890		91,352	[1]	357,993		270,297	[2]
Memory | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	1,325		1,356	[2]	13,631		8,586	[1]
Memory | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	11,164		1,045	[1]	17,681		3,059	[2]
Universal Robots (UR) | Robotics
Disaggregation of Revenue [Line Items]
Total	73,418		70,545	[1]	215,764		200,429	[2]
Universal Robots (UR) | Point in Time | Robotics
Disaggregation of Revenue [Line Items]
Total	71,607		68,938	[1]	210,222		194,698	[2]
Universal Robots (UR) | Over Time | Robotics
Disaggregation of Revenue [Line Items]
Total	1,811		1,607	[1]	5,542		5,731	[2]
Universal Robots (UR) | Asia Pacific | Robotics
Disaggregation of Revenue [Line Items]
Total	10,873		15,430	[1]	37,254		43,530	[2]
Universal Robots (UR) | Americas | Robotics
Disaggregation of Revenue [Line Items]
Total	32,315		26,073	[2]	82,220		69,346	[1]
Universal Robots (UR) | Europe, Middle East and Africa | Robotics
Disaggregation of Revenue [Line Items]
Total	30,230		29,042	[1]	96,290		87,553	[2]
MiR | Robotics
Disaggregation of Revenue [Line Items]
Total	15,233		15,147	[1]	50,788		46,112	[2]
MiR | Point in Time | Robotics
Disaggregation of Revenue [Line Items]
Total	15,065		14,012	[1]	49,850		42,748	[2]
MiR | Over Time | Robotics
Disaggregation of Revenue [Line Items]
Total	168		1,135	[1]	938		3,364	[2]
MiR | Asia Pacific | Robotics
Disaggregation of Revenue [Line Items]
Total	2,960		3,180	[1]	11,361		6,973	[2]
MiR | Americas | Robotics
Disaggregation of Revenue [Line Items]
Total	8,460		7,154	[2]	28,195		25,051	[1]
MiR | Europe, Middle East and Africa | Robotics
Disaggregation of Revenue [Line Items]
Total	$ 3,813		$ 4,813	[1]	$ 11,232		$ 14,088	[2]

[1] Includes $0.8 million and $1.4 million in 2024, and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

[2] Includes $2.5 million and $3.9 million in 2024 and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

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Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Accounting Policies [Abstract]
Revenue on leases	$ 0.8	$ 1.4	$ 2.5	$ 3.9

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Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	Sep. 29, 2024	Jun. 30, 2024	Dec. 31, 2023	Oct. 01, 2023	Jul. 02, 2023	Dec. 31, 2022
Deferred Revenue Arrangement [Line Items]
Maintenance, service and training	$ 57,866		$ 66,458
Customer advances, undelivered elements and other	44,116		35,731
Extended warranty	38,929	$ 33,512	34,897	$ 38,843	$ 44,422	$ 56,180
Total deferred revenue and customer advances	$ 140,911		$ 137,086

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Dispositions - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	May 27, 2024	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax gain on sale of business		$ 0	$ 0	$ 57,486	$ 0
Device Interface Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 85,000
Pre-tax gain on sale of business				$ 57,500

XML

Schedule of Assets and Liabilities Related to the DIS Sale Agreement (Detail) - USD ($) $ in Thousands	Sep. 29, 2024	Dec. 31, 2023
Current assets:
Prepayments		$ 5,300
Total current assets held for sale	$ 0	23,250
Total assets held for sale	0	11,531
Current liabilities:
Total current liabilities held for sale	0	7,379
Total liabilities held for sale	$ 0	2,000
Device Interface Solutions
Current assets:
Inventories, net		17,952
Prepayments		5,298
Total current assets held for sale		23,250
Property, plant and equipment, net		8,986
Operating lease right-of-use assets, net		2,545
Total assets held for sale		34,781
Current liabilities:
Accounts payable		6,356
Other accrued liabilities		552
Operating lease liabilities		471
Total current liabilities held for sale		7,379
Long-term operating lease liabilities		2,000
Total liabilities held for sale		9,379
Net assets held for sale		$ 25,402

XML

Equity Method Investments - Additional Information (Detail) - USD ($)		9 Months Ended
	May 27, 2024	Sep. 29, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Equity Method Investments and Joint Ventures [Abstract]
Payment to purchase issued and outstanding shares by Technoprobe	$ 524,100,000
Equity method investment		$ 538,351,000		$ 524,060,000	$ 0
Percentage of issued and outstanding shares acquired	10.00%
Fair value of publicly-traded investment in Technoprobe		471,800,000
Equity method investment, other-than-temporary impairment		$ 0
Aggregate cost			$ 204,700,000

XML

Equity Method Investment - Summary of Equity Method Investment (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 29, 2024	Sep. 29, 2024
Equity Method Investments and Joint Ventures [Abstract]
Balance at June 30, 2024	$ 524,060	$ 0
Other comprehensive income related to investment	15,366
Equity in net earnings of affiliate	(1,075)	(1,075)
Balance at September 29, 2024	$ 538,351	$ 538,351

XML

Composition of Inventories, Net (Detail) - USD ($) $ in Thousands		Sep. 29, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Raw material		$ 216,019	$ 258,422
Work-in-process		48,249	26,851
Finished goods		33,072	24,701
Total inventories, net	[1]	$ 297,340	$ 309,974

[1] Inventories, net at December 31, 2023, exclude $18.0 million of primarily work-in-process inventories, net classified as assets held for sale. See Note E: "Dispositions" for additional information.

XML

Composition of Inventories, Net (Parenthetical) (Detail) $ in Millions	Dec. 31, 2023 USD ($)
Inventory Disclosure [Abstract]
Inventory work in process held for sale	$ 18.0

XML

Inventories - Additional Information (Detail) - USD ($) $ in Millions	Sep. 29, 2024	Dec. 31, 2023
Inventory [Line Items]
Inventory reserves	$ 140.5	$ 136.0

XML

Financial Instruments - Additional Information (Detail) € in Millions			3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 12, 2024 EUR (€)	Nov. 07, 2023 EUR (€)	Sep. 29, 2024 USD ($)	Oct. 01, 2023 USD ($)	Sep. 29, 2024 USD ($)	Oct. 01, 2023 USD ($)	Dec. 31, 2023 USD ($)
Financial Instruments and Fair Value [Line Items]
Available-for-sale securities, realized gain			$ 800,000	$ 100,000	$ 2,100,000	$ 600,000
Available-for-sale securities, realized loss			0	0	300,000	300,000
Fair market value of investments with unrealized losses greater than one year			44,100,000		44,100,000		$ 65,200,000
Fair market value of investments with unrealized losses less than one year			8,300,000		8,300,000		22,300,000
Unrealized loss on contracts, net			(2,900,000)	5,300,000	3,100,000	12,300,000
Equity securities unrealized gain			2,200,000	0	5,400,000	4,600,000
Equity securities unrealized loss			0	1,700,000	0	1,700,000
Other comprehensive income (Loss), cash flow hedge, gain (loss), before reclassification, after tax			(260,000)	$ 2,590,000	1,014,000	$ 6,456,000
Call Option
Financial Instruments and Fair Value [Line Items]
Realized loss on contracts, net					(9,800,000)
Expiration date of the option		Apr. 26, 2024
Fair value of outstanding contracts							17,400,000
Technoprobe S.p.A
Financial Instruments and Fair Value [Line Items]
Percentage of investment acquired		10.00%
Technoprobe S.p.A | Call Option
Financial Instruments and Fair Value [Line Items]
Notional Amount | €		€ 481.0
Cash Flow Hedging [Member]
Financial Instruments and Fair Value [Line Items]
Other comprehensive income (Loss), cash flow hedge, gain (loss), before reclassification, after tax					(300,000)		600,000
Debt Mutual Funds
Financial Instruments and Fair Value [Line Items]
Available for sale securities with out contractual maturity date			$ 8,600,000		8,600,000
Forward
Financial Instruments and Fair Value [Line Items]
Notional Amount | €	€ 481.0
Expiration date of the option	May 23, 2024
Foreign Exchange Contracts
Financial Instruments and Fair Value [Line Items]
Unrealized loss on contracts, net					$ (800,000)		$ (1,800,000)

XML

Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 29, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	$ 114,095	$ 132,456
U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	41,833	41,808
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	37,149	52,734
Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	21,741	21,772
Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	8,640	8,773
U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	3,931	4,892
Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		1,667
Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	801	810
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	677,611	937,159
Derivative assets	332	18,746
Total	677,943	955,905
Derivative liabilities	1,435	2,545
Total	1,435	2,545
Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	198,946	298,156
Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	311,090	459,415
Fair Value, Measurements, Recurring | U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	41,833	41,808
Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	37,149	52,734
Fair Value, Measurements, Recurring | Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	21,741	21,772
Fair Value, Measurements, Recurring | Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	8,640	8,773
Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	3,931	4,892
Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		1,667
Fair Value, Measurements, Recurring | Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	801	810
Fair Value, Measurements, Recurring | Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities	53,480	47,132
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	569,066	807,359
Derivative assets	0	0
Total	569,066	807,359
Derivative liabilities	0	0
Total	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	198,946	298,156
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	308,000	453,298
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	8,640	8,773
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities	53,480	47,132
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	108,545	129,800
Derivative assets	332	18,746
Total	108,877	148,546
Derivative liabilities	1,435	2,545
Total	1,435	2,545
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	0	0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	3,090	6,117
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	41,833	41,808
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	37,149	52,734
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	21,741	21,772
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	3,931	4,892
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		1,667
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	801	810
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total		0
Derivative assets	0	0
Total	0	0
Derivative liabilities	0	0
Total	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities		$ 0

XML

Schedule of Reported Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 29, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	$ 677,943	$ 955,905
Liabilities	1,435	2,545
Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	1,435	2,545
Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	332	18,746
Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	510,036	757,571
Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	41,631	62,154
Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	125,944	117,434
Quoted Prices in Active Markets for Identical Instruments (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	569,066	807,359
Liabilities	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	506,946	751,454
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	62,120	55,905
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	108,877	148,546
Liabilities	1,435	2,545
Significant Other Observable Inputs (Level 2) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	1,435	2,545
Significant Other Observable Inputs (Level 2) | Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	332	18,746
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	3,090	6,117
Significant Other Observable Inputs (Level 2) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	41,631	62,154
Significant Other Observable Inputs (Level 2) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	63,824	61,529
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Liabilities	0	0
Significant Unobservable Inputs (Level 3) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	0	0
Significant Unobservable Inputs (Level 3) | Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Significant Unobservable Inputs (Level 3) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Significant Unobservable Inputs (Level 3) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Significant Unobservable Inputs (Level 3) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	$ 0	$ 0

XML

Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 29, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Available-for-sale marketable securities, Fair Market Value	$ 114,095	$ 132,456
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	510,036	757,571
Available-for-sale marketable securities, Fair Market Value	167,575	179,588
Derivative assets	332	18,746
Derivative liabilities	$ 1,435	$ 2,545
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Deferred Tax and Other Liabilities, Noncurrent	Deferred Tax and Other Liabilities, Noncurrent
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	$ 510,036	$ 757,571
Available-for-sale marketable securities, Fair Market Value	167,575	179,588
Derivative assets	332	18,746
Derivative liabilities	$ 1,435	$ 2,545
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Deferred Tax and Other Liabilities, Noncurrent	Deferred Tax and Other Liabilities, Noncurrent
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent

XML

Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Sep. 29, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 120,817	$ 140,377
Available-for-sale marketable securities, Unrealized Gain	440	249
Available-for-sale marketable securities, Unrealized (Loss)	(7,162)	(8,170)
Available-for-sale marketable securities, Fair Market Value	114,095	132,456
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	52,428	87,538
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	45,522	45,725
Available-for-sale marketable securities, Unrealized Gain	106	14
Available-for-sale marketable securities, Unrealized (Loss)	(3,795)	(3,931)
Available-for-sale marketable securities, Fair Market Value	41,833	41,808
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	22,985	35,080
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	39,986	56,458
Available-for-sale marketable securities, Unrealized Gain	323	201
Available-for-sale marketable securities, Unrealized (Loss)	(3,160)	(3,925)
Available-for-sale marketable securities, Fair Market Value	37,149	52,734
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	25,248	44,263
Certificates of Deposit and Time Deposits
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	21,741	21,772
Available-for-sale marketable securities, Unrealized Gain		0
Available-for-sale marketable securities, Unrealized (Loss)		0
Available-for-sale marketable securities, Fair Market Value	21,741	21,772
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses		0
Debt Mutual Funds
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	8,846	9,081
Available-for-sale marketable securities, Unrealized Gain		0
Available-for-sale marketable securities, Unrealized (Loss)	(206)	(308)
Available-for-sale marketable securities, Fair Market Value	8,640	8,773
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	3,319	3,303
U.S. Government Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	3,921	4,898
Available-for-sale marketable securities, Unrealized Gain	11	0
Available-for-sale marketable securities, Unrealized (Loss)	(1)	(6)
Available-for-sale marketable securities, Fair Market Value	3,931	4,892
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	876	4,892
Commercial Paper
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost		1,633
Available-for-sale marketable securities, Unrealized Gain		34
Available-for-sale marketable securities, Unrealized (Loss)		0
Available-for-sale marketable securities, Fair Market Value		1,667
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses		0
Non-U.S. Government Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	801	810
Available-for-sale marketable securities, Unrealized Gain		0
Available-for-sale marketable securities, Unrealized (Loss)		0
Available-for-sale marketable securities, Fair Market Value	801	810
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses		$ 0

XML

Schedule of Reported Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Sep. 29, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 120,817	$ 140,377
Available-for-sale marketable securities, Unrealized Gain	440	249
Available-for-sale marketable securities, Unrealized (Loss)	(7,162)	(8,170)
Available-for-sale marketable securities, Fair Market Value	114,095	132,456
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	52,428	87,538
Marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	41,673	62,385
Available-for-sale marketable securities, Unrealized Gain	20	36
Available-for-sale marketable securities, Unrealized (Loss)	(62)	(267)
Available-for-sale marketable securities, Fair Market Value	41,631	62,154
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	9,973	34,844
Long-term marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	79,144	77,992
Available-for-sale marketable securities, Unrealized Gain	420	213
Available-for-sale marketable securities, Unrealized (Loss)	(7,100)	(7,903)
Available-for-sale marketable securities, Fair Market Value	72,464	70,302
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 42,455	$ 52,694

XML

Contractual Maturities of Investments in Debt Securities Held (Detail) $ in Thousands	Sep. 29, 2024 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 41,673
Due after 1 year through 5 years, cost	25,690
Due after 5 years through 10 years, cost	7,950
Due after 10 years, cost	36,658
Total, cost	111,971
Due within one year, fair market value	41,631
Due after 1 year through 5 years, fair market value	25,729
Due after 5 years through 10 years, fair market value	7,908
Due after 10 years, fair maket value	30,187
Total, fair market value	$ 105,455

XML

Schedule of Notional Amount of Derivatives (Detail) - USD ($) $ in Millions	Sep. 29, 2024	Dec. 31, 2023
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	$ 146.1
Derivative Asset, Notional amounts		$ 152.1
U.S. dollar/Taiwan dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	29.6	42.7
U.S. dollar/Japanese yen
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	21.7	11.0
U.S. dollar/Korean won
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	8.9	7.2
U.S. dollar/British pound sterling
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	1.0	1.5
Danish krone/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	0.0	36.0
Derivative Asset, Notional amounts	25.7	0.7
Euro/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	24.8	25.3
Singapore dollar/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	23.0	16.6
Philippine peso/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	9.7	10.1
Chinese yuan/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	$ 1.7	$ 1.0

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Schedule Of Foreign Currency Cash Flow Hedges (Detail) - Foreign Exchange Forward [Member] - Cash Flow Hedging [Member] - USD ($) $ in Millions	Sep. 29, 2024	Dec. 31, 2023
Derivative, Notional Amount	$ 12.1	$ 35.5
Long [Member] | U.S. dollar/Japanese yen
Derivative, Notional Amount	$ 12.1	$ 35.5

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Schedule of Derivative Instruments in Statement of Financial Position at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 29, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), net	$ (1,103)	$ 16,200
Not Designated as Hedging Instrument | Foreign Exchange Forward [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	332	733
Not Designated as Hedging Instrument | Foreign Exchange Forward [Member] | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	(1,102)	(2,545)
Not Designated as Hedging Instrument | Foreign Exchange Option [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	0	17,364
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	0	648
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (333)	$ 0

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Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Foreign Exchange Option [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net		$ 4,829	$ (5,846)	$ 8,170	$ (6,675)
Other (income) expense, net | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Losses (Gains) on derivatives recognized in statements of operations	[1]	4,829	(1,886)	686	(4,667)
Other (income) expense, net | Not Designated as Hedging Instrument [Member] | Foreign Exchange Option [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net		0	0	9,764	0
Sales [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward and Option Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net		$ 0	$ (3,960)	$ (2,280)	$ (2,008)

[1] The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies. For the three and nine months ended September 29, 2024, net losses (gains) from remeasurement of monetary assets and liabilities denominated in foreign currencies were $(2.9) million and $3.1 million, respectively. For the three and nine months ended October 1, 2023, net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $5.3 million and $12.3 million, respectively.

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Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Unrealized Gain (loss) on contracts	$ (2.9)	$ 5.3	$ 3.1	$ 12.3

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Debt - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions		3 Months Ended	9 Months Ended
	Dec. 12, 2016	Sep. 29, 2024	Sep. 29, 2024	Oct. 01, 2023	May 27, 2024	May 16, 2024	Dec. 31, 2023	Oct. 05, 2022	May 01, 2020
Debt Instrument
Repurchase of common stock			$ 55,053,000	$ 346,492,000
Stock issued during period, value		$ 1,200,000	10,000,000
Line of Credit Facility, Maximum Borrowing Capacity								$ 750,000,000	$ 400,000,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases		200,000,000	$ 200,000,000
Line of Credit Facility, Interest Rate Description			The interest rate applicable to loans under the Credit Facility are, at Teradyne’s option, equal to either a base rate plus a margin ranging from 0.00% to 0.75% per annum or SOFR plus a margin ranging from 1.10% to 1.85% per annum, based on the consolidated leverage ratio of Teradyne. In addition, Teradyne will pay a commitment fee on the unused portion of the commitments under the Credit Facility ranging from 0.15% to 0.25% per annum, based on the then applicable consolidated leverage ratio.
Term of revolving credit facility									3 years
Available Incremental Amount Under The Credit Facility Not To Exceed Percentage Of Consolidated EBIDTA			15.00%
Percentage of issued and outstanding shares acquired					10.00%
Retained Earnings (Accumulated Deficit)		$ 990,039,000	$ 990,039,000				$ 706,514,000
Warrant [Member]
Debt Instrument
Warrant expired		1.3	14.7
Collateral Pledged [Member]
Debt Instrument
Line of Credit Facility, Interest Rate Description			65
1.25% Convertible Senior Unsecured Notes Due December 15, 2023
Debt Instrument
Aggregate principal amount	$ 460,000,000
Debt instrument, interest rate, stated percentage	1.25%
Debt instrument, net proceeds after issuance costs	$ 450,800,000
Payment for net cost of convertible note hedges net of warrant proceeds	33,000,000
Repurchase of common stock	$ 50,100,000
Repurchase of stock, shares	2.0
Debt instrument, frequency of periodic payment	payable semiannually in arrears on June 15 and December 15 of each year
1.25% Convertible Senior Unsecured Notes
Debt Instrument
Senior notes maturity date	Dec. 15, 2023
Shares that would be issued upon conversion			1.3
Strike price per share of warrant			$ 39.35
Maximum | 1.25% Convertible Senior Unsecured Notes
Debt Instrument
Warrant transactions expiry date			Jul. 10, 2024
Minimum | 1.25% Convertible Senior Unsecured Notes
Debt Instrument
Warrant transactions expiry date			Mar. 18, 2024
Revolving Credit Facility | Maximum | Truist Bank [Member]
Debt Instrument
Commitment fee percentage of unused portion of credit facility			0.25%
Revolving Credit Facility | Minimum | Truist Bank [Member]
Debt Instrument
Commitment fee percentage of unused portion of credit facility			0.15%
Revolving Credit Facility | Base Rate | Maximum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate			0.75%
Revolving Credit Facility | Base Rate | Minimum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate			0.00%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate			1.85%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate			1.10%
Credit Agreement
Debt Instrument
Borrowed amount		$ 0	$ 0			$ 185,000,000
Percentage of issued and outstanding shares acquired						10.00%

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Interest Expense on Teradyne's Senior Notes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Debt Instrument
Contractual interest expense on the coupon	$ 0	$ 74	$ 0	$ 312
Amortization of debt issuance fees recognized as interest expense	0	0	0	113
Total interest expense on the convertible debt	$ 0	$ 74	$ 0	$ 425

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Schedule of Prepayments and Other Current Assets (Detail) - USD ($) $ in Thousands		Sep. 29, 2024	Dec. 31, 2023
Prepaid And Other Current Assets [Line Items]
Contract manufacturer and supplier prepayments		$ 439,647	$ 502,257
Prepaid maintenance and other services		19,040	17,592
Prepaid taxes		20,734	16,083
Other prepayments		10,127	13,038
Total prepayments	[1]	$ 489,548	$ 548,970

[1] Excludes $5.3 million at December 31, 2023, of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: “Dispositions” for additional information.

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Prepayments - Schedule of Prepayments and Other Current Assets (Parenthetical) (Details) $ in Millions	Dec. 31, 2023 USD ($)
Prepayments [Abstract]
Contract manufacturer and supplier prepayments, classified as assets held for sale	$ 5.3

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Warranty Accrual Included in Other Accrued Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 15,244	$ 12,543	$ 15,698	$ 14,181
Accruals for warranties issued during the period	2,149	8,859	8,331	16,237
Accruals related to pre-existing warranties	(545)	(795)	(1,513)	(1,552)
Settlements made during the period	(2,990)	(5,892)	(8,658)	(14,151)
Balance at end of period	$ 13,858	$ 14,715	$ 13,858	$ 14,715

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Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 33,512	$ 44,422	$ 34,897	$ 56,180
Deferral of new extended warranty revenue	9,714	2,734	22,316	11,615
Recognition of extended warranty deferred revenue	(4,297)	(8,313)	(18,284)	(28,952)
Balance at end of period	$ 38,929	$ 38,843	$ 38,929	$ 38,843

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023
Share-based Compensation Arrangement by Share-based Payment Award
Total shareholder return performance measurement period	3 years
Stock price	$ 95.14	$ 104.15
Description of retirement policy	On January 22, 2024, the Board enacted the Executive Retirement Policy for Restricted Stock Unit and Option Vesting (the "Retirement Policy"). Under the Retirement Policy, an executive officer that is over the age of 65 and has 10 or more years of service as of the effective date of his or her retirement will be eligible for continued vesting of his or her unvested time-based restricted stock units and stock options granted prior to his or her retirement date.
Retirement Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Allocated share-based compensation expense		$ 5.9
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of common stock price paid	100.00%
Employee Stock Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments	7 years
Employee Stock Option [Member] | Measurement Input, Expected Dividend Payment [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Estimated annual dividend amount per share	$ 0.48	$ 0.44
Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments	4 years
Percentage of awards vesting on the first anniversary of grant date	100.00%
Restricted Stock Units | Director
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments	1 year
TSR Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Total shareholder return performance measurement period	3 years
Minimum years of service for retirement to be eligible for PRSUs	10 years
Restricted stock unit awards granted	0.1	0.1
Weighted average grant date fair value of restricted stock units granted	$ 102.51	$ 139.04
Stock price		104.12
Weighted average grant date stock price	95.83
TSR Performance-Based Restricted Stock Units | Measurement Input, Expected Dividend Payment [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Estimated annual dividend amount per share	$ 0.48	$ 0.44
TSR Performance-Based Restricted Stock Units | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of vesting of target shares upon performance achieved	0.00%
TSR Performance-Based Restricted Stock Units | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of vesting of target shares upon performance achieved	200.00%
Employee Stock Purchase Plan | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments	4 years
PBIT Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted	0.1	0.1
Weighted average grant date fair value of restricted stock units granted	$ 94.51	$ 102.91
Service-Based Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted	0.6	0.5
Weighted average grant date fair value of restricted stock units granted	$ 95.98	$ 102.66
Service-Based Restricted Stock Units | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted	0.1	0.1
Service-Based Restricted Stock Units | Non Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted	0.1	0.1
Weighted average grant date fair value of restricted stock units granted	$ 120.38	$ 90.5
Service Based Stock Options | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average grant date fair value of restricted stock units granted	$ 37.5	$ 41.23

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Schedule of Estimated Fair Value of TSR Performance-Based Restricted Stock Unit Awards Assumptions (Detail) - TSR Performance-Based Restricted Stock Units	9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023
Share-based Compensation Arrangement by Share-based Payment Award
Risk-free interest rate	3.90%	4.00%
Expected historical volatility	42.40%	49.70%
Dividend yield	0.50%	0.40%
New York Stock Exchange Composite Index
Share-based Compensation Arrangement by Share-based Payment Award
Expected historical volatility	15.60%	24.10%

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Schedule of Estimated Fair Value of Stock Options Grant Using Black Scholes Option Pricing Model (Detail) - Employee Stock Option [Member]	9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023
Share-based Compensation Arrangement by Share-based Payment Award
Expected life (years)	4 years	4 years
Risk-free interest rate	4.00%	3.80%
Volatility-historical	46.30%	46.60%
Dividend yield	0.50%	0.40%

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Changes in Accumulated Other Comprehensive Income (loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 2,730,812	$ 2,434,883	$ 2,525,897	$ 2,451,294
Other comprehensive income (loss)	40,076	(17,456)	22,950	1,940
Balance	2,902,542	2,441,300	2,902,542	2,441,300
Foreign Currency Translation Reclassification Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(22,442)	(39,849)
Other comprehensive (loss) gain before reclassifications, net of tax			22,751	(2,073)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			0	0
Other comprehensive income (loss)			22,751	(2,073)
Balance	309	(41,922)	309	(41,922)
Unrealized (Losses) Gains on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(6,194)	(8,661)
Other comprehensive (loss) gain before reclassifications, net of tax			885	(903)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			86	33
Other comprehensive income (loss)			971	(870)
Balance	(5,223)	(9,531)	(5,223)	(9,531)
Unrealized (Losses) Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			506	(2,517)
Other comprehensive (loss) gain before reclassifications, net of tax			1,014	6,456
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			(1,780)	(1,567)
Other comprehensive income (loss)			(766)	4,889
Balance	(260)	2,372	(260)	2,372
Retirement Plans Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			1,152	1,159
Other comprehensive (loss) gain before reclassifications, net of tax			0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(2)	(2)	(6)	(6)
Other comprehensive income (loss)			(6)	(6)
Balance	1,146	1,153	1,146	1,153
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(44,104)	(30,472)	(26,978)	(49,868)
Other comprehensive (loss) gain before reclassifications, net of tax			24,650	3,480
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(9)	(3,093)	(1,700)	(1,540)
Other comprehensive income (loss)	40,076	(17,456)	22,950	1,940
Balance	$ (4,028)	$ (47,928)	$ (4,028)	$ (47,928)

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Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss), tax	$ (2)	$ (869)	$ (477)	$ (433)
Foreign currency translation adjustments, tax	0	0	0	0	$ 0	$ 0
Unrealized (losses) gains on marketable securities, tax	(1,499)	(2,707)	(1,499)	(2,707)	(1,728)	(2,308)
Unrealized (Losses) Gains on Cash Flow Hedges	(73)	667	(73)	667	142	(708)
Retirement plans prior service benefit, tax	(1,133)	(1,131)	(1,133)	(1,131)	$ (1,132)	$ (1,130)
Foreign Currency Translation Reclassification Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax			0	0
Amounts reclassified from accumulated other comprehensive income (loss), tax			0	0
Other comprehensive income (loss), tax			0	0
Unrealized (Losses) Gains on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax			205	(408)
Amounts reclassified from accumulated other comprehensive income (loss), tax	(2)	0	24	9
Other comprehensive income (loss), tax			229	(399)
Unrealized (Losses) Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax			285	1,816
Amounts reclassified from accumulated other comprehensive income (loss), tax			(500)	(441)
Other comprehensive income (loss), tax			(215)	1,375
Retirement Plans Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax			0	0
Amounts reclassified from accumulated other comprehensive income (loss), tax	$ 0	$ 0	(1)	(1)
Other comprehensive income (loss), tax			$ (1)	$ (1)

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Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (expense)	$ 7	$ 0	$ (86)	$ (33)
Unrealized (losses) gains, net	0	3,091	1,780	1,567
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (expense)	7	0	(86)	(33)
Reclassifications, net of tax			(86)	(33)
Amortization of Prior Service Credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	2	2	6	6
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	$ 9	$ 3,093	$ 1,700	$ 1,540

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Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	$ 0	$ 869	$ 500	$ 441
Reclassifications, tax	2	869	477	433
Unrealized (Losses) Gains on Marketable Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	2	0	(24)	(9)
Amortization of Prior Service Credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	$ 0	$ 0	$ 1	$ 1

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Goodwill and Acquired Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Goodwill and Intangible Assets Disclosure [Line Items]
Acquired intangible assets amortization	$ 4,748	$ 4,720	$ 14,108	$ 14,348

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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Sep. 29, 2024
Goodwill [Line Items]
Goodwill	$ 1,178,218	$ 1,181,978
Accumulated impairment losses	(762,566)	(762,566)
Foreign currency translation adjustment	3,760
Total Goodwill	415,652	419,412
Robotics
Goodwill [Line Items]
Goodwill	395,463	399,229
Accumulated impairment losses	0	0
Foreign currency translation adjustment	3,765
Total Goodwill	395,463	399,229
Wireless Test
Goodwill [Line Items]
Goodwill	361,819	361,819
Accumulated impairment losses	(353,843)	(353,843)
Foreign currency translation adjustment	0
Total Goodwill	7,976	7,976
Semiconductor Test
Goodwill [Line Items]
Goodwill	262,237	262,232
Accumulated impairment losses	(260,540)	(260,540)
Foreign currency translation adjustment	(5)
Total Goodwill	1,697	1,692
System Test
Goodwill [Line Items]
Goodwill	158,699	158,699
Accumulated impairment losses	(148,183)	(148,183)
Foreign currency translation adjustment	0
Total Goodwill	$ 10,516	$ 10,516

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Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 29, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 378,822	$ 378,822
Accumulated Amortization	(351,158)	(337,062)
Foreign Currency Translation Adjustment	(6,376)	(6,356)
Net Carrying Amount	21,288	35,404
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	267,706	267,706
Accumulated Amortization	(252,406)	(243,191)
Foreign Currency Translation Adjustment	(5,337)	(5,343)
Net Carrying Amount	9,963	19,172
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	52,109	52,109
Accumulated Amortization	(49,134)	(47,850)
Foreign Currency Translation Adjustment	210	232
Net Carrying Amount	3,185	4,491
Trademarks and tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	59,007	59,007
Accumulated Amortization	(49,618)	(46,021)
Foreign Currency Translation Adjustment	(1,249)	(1,245)
Net Carrying Amount	$ 8,140	$ 11,741

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Schedule of Estimated Intangible Asset Amortization Expense (Detail) $ in Thousands	Sep. 29, 2024 USD ($)
Finite-Lived Intangible Assets
2024	$ 4,775
2025	11,454
2026	2,402
2027	1,185
2028	1,104
Thereafter	$ 368

XML

Net Income Per Common Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Employee Stock Option [Member]
Net Income Loss Per Common Share
Exercise of stock options	0.1	0.1	0.5	0.4

XML

Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Net Income Loss Per Common Share
Net Income (Loss)		$ 145,649	$ 128,116	$ 396,119	$ 331,698
Weighted average common shares-basic		163,002,000	153,762,000	157,951,000	154,809,000
Convertible note hedge warrant shares	[1]	460,000	9,168,000	4,751,000	9,009,000
Incremental shares from assumed conversion of convertible notes	[2]	0	629,000	0	762,000
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements		10,000	10,000	5	8
Weighted Average Number of Shares Outstanding, Diluted, Adjustment, Total		1,251,000	10,288,000	5,406,000	10,228,000
Weighted average common shares-diluted		164,253,000	164,050,000	163,357,000	165,037,000
Earnings Per Share, Basic		$ 0.89	$ 0.83	$ 2.51	$ 2.14
Earnings Per Share, Diluted		$ 0.89	$ 0.78	$ 2.42	$ 2.01
Restricted Stock Units
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		768,000	455,000	637	410
Employee Stock Option [Member]
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		13,000	26,000	13	39

[1] Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price, multiplied by the number of warrant shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period.

[2] Incremental shares from assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible notes, was divided by the average Teradyne stock price for the period.

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Restructuring and Other - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 29, 2024 USD ($)	Oct. 01, 2023 USD ($) HeadCount	Jul. 02, 2023 HeadCount	Sep. 29, 2024 USD ($) HeadCount	Oct. 01, 2023 USD ($)
Restructuring Cost and Reserve
Severance benefit and charges	$ 0.3	$ 4.7		$ 5.3	$ 11.8
Number of severance charges related to headcount reductions | HeadCount		94	197	87
Contract termination charge		$ 1.5			1.5
Increase in environmental liability others					$ 1.1
Technoprobe [Member]
Restructuring Cost and Reserve
Acquisition and divestiture expenses				$ 2.2

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Retirement Plans - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 29, 2024 USD ($) RetireeParticipants	Sep. 29, 2024 USD ($) RetireeParticipants	Oct. 01, 2023 USD ($)
U.S. Supplemental Executive Defined Benefit Pension Plan
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans		$ 2.3	$ 2.3
Non-United States Subsidiaries
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans in 2018	$ 0.8	$ 0.8	$ 0.8
Group Annuity Contract | U.S. Qualified Pension Plan
Defined Benefit Plan Disclosure
Retiree participants transferred to accrued pension obligation | RetireeParticipants	132	132
Reduction in pension benefit obligation and pension assets	$ 23.4
Settlement expense	$ 0.4	$ 0.4

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Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Defined Benefit Plan Disclosure
Net actuarial loss (gain)			$ (2,512)	$ 0
United States
Defined Benefit Plan Disclosure
Service cost	$ 216	$ 272	665	815
Interest cost	1,590	1,713	4,883	5,138
Expected return on plan assets	(1,204)	(1,286)	(3,737)	(3,856)
Net actuarial loss (gain)	(2,262)	0	(2,151)	24
Settlement expense	394	0	394	0
Total net periodic pension cost	(1,266)	699	54	2,121
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	119	107	360	320
Interest cost	256	253	766	762
Expected return on plan assets	(23)	(11)	(58)	(28)
Net actuarial loss (gain)	0	66	(242)	66
Settlement expense	0	5	(24)	5
Total net periodic pension cost	352	420	802	1,125
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Service cost	9	9	28	26
Interest cost	72	60	217	181
Net actuarial loss (gain)	0	0	(94)	30
Amortization of prior service credit	(2)	(2)	(7)	(7)
Special termination benefits	0	1,423	462	1,792
Total net periodic pension cost	$ 79	$ 1,490	$ 606	$ 2,022

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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 29, 2024	Dec. 31, 2023
Purchase Commitment, Excluding Long-term Commitment
Aggregate purchase commitments	$ 458.1
Purchase commitments less than one year	445.9
Product warranty accrual	13.9	$ 15.7
Revenue deferrals related to extended warranties	$ 38.9	$ 34.9

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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	Dec. 15, 2022	Aug. 16, 2022	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023	Dec. 31, 2023
Income Taxes [Line Items]
Decrease in Unrecognised Tax Benefit due to lapse in Statute of limitation					$ 700
Accrued interest and penalties			$ 200		200		$ 1,300
Interest and penalties related to income tax, expense (benefit)					(1,000)	$ 200
Uncertain tax positions			7,600		7,600		$ 18,600
Net increase in uncertain tax positions					(11,000)
Percentage of alternative minimum tax		15.00%
Minimum effective tax rate	15.00%
Gain on sale of a business			0	$ 0	57,486	0
Income tax expense			$ 12,260	$ 16,164	54,095	$ 54,069
Device Interface Solutions
Income Taxes [Line Items]
Gain on sale of a business					57,500
Income tax expense					$ 10,700
SINGAPORE
Income Taxes [Line Items]
Tax savings due to the tax holiday, per share					$ 0.06	$ 0.01
Income Tax Holiday, Aggregate Dollar Amount					$ 10,200	$ 1,700

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Schedule of Reconciliation of Effective Tax Rate (Detail)	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Income Tax Disclosure [Line Items]
U.S. statutory federal tax rate	21.00%	21.00%	21.00%	21.00%
Non-deductible officers' compensation	0.50%	1.30%	0.40%	1.10%
Tax credits	(5.00%)	(9.30%)	(3.60%)	(5.00%)
Discrete expense (benefit) related to reserves for uncertain tax positions	(4.90%)	0.30%	(2.20%)	0.10%
Foreign taxes	(4.90%)	(1.50%)	(3.30%)	(1.10%)
International provisions of the U.S. Tax Cuts and Jobs Act of 2017	(0.80%)	(3.10%)	(1.10%)	(2.90%)
Other, net	1.90%	2.50%	0.80%	0.80%
Effective tax rate	7.80%	11.20%	12.00%	14.00%

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Segment Information - Additional Information (Detail)	9 Months Ended
	Sep. 29, 2024 Segment
Segment Reporting Information [Line Items]
Operating segments	4

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Schedule of Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 29, 2024		Oct. 01, 2023		Sep. 29, 2024		Oct. 01, 2023		Dec. 31, 2023
Segment Reporting Information [Line Items]
Revenues		$ 737,298	[1]	$ 703,732	[1]	$ 2,066,996	[2]	$ 2,005,699	[2]
Income (loss) before income taxes	[3],[4]	158,984		144,280		451,289		385,767
Total assets		3,769,728	[5]	3,370,655	[5]	3,769,728	[5]	3,370,655	[5]	$ 3,486,824
System Test
Segment Reporting Information [Line Items]
Revenues		73,312	[1]	83,203	[1]	209,435	[2]	252,106	[2]
Wireless Test
Segment Reporting Information [Line Items]
Revenues		32,601	[1]	36,974	[1]	93,457	[2]	119,472	[2]
Operating Segments
Segment Reporting Information [Line Items]
Revenues		737,298		703,732		2,066,996		2,005,699
Income (loss) before income taxes	[3],[4]	156,373		147,862		394,869		393,442
Total assets	[5]	2,357,481		2,338,069		2,357,481		2,338,069
Operating Segments | Semiconductor Test
Segment Reporting Information [Line Items]
Revenues		542,734		497,863		1,497,552		1,387,580
Income (loss) before income taxes	[3],[4]	163,778		136,451		401,475		361,676
Total assets	[5]	1,308,031		1,382,444		1,308,031		1,382,444
Operating Segments | System Test
Segment Reporting Information [Line Items]
Revenues		73,312		83,203		209,435		252,106
Income (loss) before income taxes	[3],[4]	12,522		23,754		36,138		67,629
Total assets	[5]	178,291		178,904		178,291		178,904
Operating Segments | Robotics
Segment Reporting Information [Line Items]
Revenues		88,651		85,692		266,552		246,541
Income (loss) before income taxes	[3],[4]	(24,206)		(21,812)		(56,099)		(66,704)
Total assets	[5]	794,277		684,207		794,277		684,207
Operating Segments | Wireless Test
Segment Reporting Information [Line Items]
Revenues		32,601		36,974		93,457		119,472
Income (loss) before income taxes	[3],[4]	4,279		9,469		13,355		30,841
Total assets	[5]	76,882		92,514		76,882		92,514
Corporate And Eliminations
Segment Reporting Information [Line Items]
Revenues		0		0		0		0
Income (loss) before income taxes	[3],[4]	2,611		(3,582)		56,420		(7,675)
Total assets	[5]	$ 1,412,247		$ 1,032,586		$ 1,412,247		$ 1,032,586

[1] Includes $0.8 million and $1.4 million in 2024, and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

[2] Includes $2.5 million and $3.9 million in 2024 and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

[3] Included in Corporate and Eliminations are interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, severance charges, pension, acquisition and divestiture related fees, and an expense for the modification of outstanding equity awards.

[4] Included in income (loss) before taxes are charges related to restructuring and other, expense for the modification of outstanding equity awards, legal settlement, pension mark-to-market, and inventory charges.

[5] Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.

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Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Segment Reporting Information [Line Items]
Restructuring and other—employee severance	$ 4,578	$ 6,856	$ 11,018	$ 15,251
Semiconductor Test
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	4,041	10,422	11,405	18,374
Restructuring and other—employee severance	0	1,776	1,277	5,055
System Test
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	0	0	1,016	1,412
Restructuring and other—employee severance	0	0	0	1,124
Robotics
Segment Reporting Information [Line Items]
Cost of revenues-legal settlement	3,600	0	3,600	0
Cost of revenues—inventory charge	537	652	1,071	2,203
Restructuring and other—employee severance	1,110	636	2,647	2,707
Wireless
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	1,204	0	2,024	1,080
Corporate And Eliminations
Segment Reporting Information [Line Items]
Restructuring and other-acquisition & divestiture related expenses	0	0	2,214	0
Selling and administrative-equity modification	0	0	1,469	5,889
Restructuring and other—employee severance	0	1,753	0	2,877
Restructuring and other-contract termination	0	1,511	0	1,511
Restructuring and other—other	$ 2,437	$ 0	$ 2,437	$ 1,100

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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended		9 Months Ended
	Jan. 01, 2023	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023	Aug. 31, 2024	May 31, 2024	Jan. 31, 2024	Aug. 31, 2023	May 31, 2023	Jan. 31, 2023
Common stock average price				$ 111.32	$ 103.89
Dividends Payable, Amount Per Share						$ 0.12	$ 0.12	$ 0.12	$ 0.11	$ 0.11	$ 0.11
Dividend payment				$ 56,936	$ 51,081
Percentage of excise tax on share repurchases in excess of issuances	1.00%
Cumulative repurchases, shares		0.5	3.4	0.5	3.4
Cumulative repurchases, value		$ 55,100	$ 349,300	$ 55,100	$ 349,300						$ 2,000,000
Common Stock
Dividend payment		$ 19,600	$ 16,900	$ 57,000	$ 51,100
2023 Repurchase Program [Member]
Common stock average price				$ 103.46
Cumulative repurchases, shares		4.4		4.4
Cumulative repurchases, value		$ 455,600		$ 455,600