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Retirement Plans (Tables)

9 Months Ended

Sep. 28, 2025

Net Periodic Pension and Postretirement Benefit Costs

For the three and nine months ended September 28, 2025, and September 29, 2024, Teradyne’s net periodic pension cost was comprised of the following:

		For the Three Months Ended
		September 28, 2025								September 29, 2024
		United States				Foreign				United States				Foreign
		(in thousands)
Service cost		$	153			$	149			$	216			$	119
Interest cost			1,426				300				1,590				256
Expected return on plan assets			(989	)			(24	)			(1,204	)			(23	)
Net actuarial loss (gain)			—				—				(2,262	)			—
Settlement loss (gain)			(800	)			—				—				—
Settlement expense			—				—				394				—
Total net periodic pension cost		$	(210	)		$	425			$	(1,266	)		$	352

		For the Nine Months Ended
		September 28, 2025								September 29, 2024
		United States				Foreign				United States				Foreign
		(in thousands)
Service cost		$	462			$	437			$	665			$	360
Interest cost			4,299				892				4,883				766
Expected return on plan assets			(2,970	)			(71	)			(3,737	)			(58	)
Net actuarial loss (gain)			41				—				(2,151	)			(242	)
Settlement loss (gain)			(800	)			—				—				—
Settlement expense			—				—				394				(24	)
Total net periodic pension cost		$	1,032			$	1,258			$	54			$	802

Postretirement Benefit Plans

Net Periodic Pension and Postretirement Benefit Costs

For the three and nine months ended September 28, 2025, and September 29, 2024, Teradyne’s net periodic postretirement benefit cost was comprised of the following:

		For the Three Months  Ended								For the Nine Months  Ended
		September 28, 2025				September 29, 2024				September 28, 2025				September 29, 2024
		(in thousands)								(in thousands)
Service cost		$	9			$	9			$	27			$	28
Interest cost			76				72				229				217
Amortization of prior service credit			(2	)			(2	)			(7	)			(7	)
Special termination benefits			—				—				684				462
Net actuarial loss (gain)			—				—				87				(94	)
Total net periodic postretirement benefit cost		$	83			$	79			$	1,020			$	606

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- Definition

Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (q)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 715
-SubTopic 20
-Subparagraph (h)
-Name Accounting Standards Codification
-Paragraph 1
-Section 50
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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