Retirement Plans (Tables)

9 Months Ended

Sep. 27, 2026

Net Periodic Pension and Postretirement Benefit Costs

For the three and nine months ended September 27, 2026, and September 28, 2025, Teradyne’s net periodic pension cost was comprised of the following:


		For the Three Months Ended
		September 27, 2026								September 28, 2025
		United States				Foreign				United States				Foreign
		(in thousands)
Service cost		$	141			$	296			$	153			$	149
Interest cost			1,358				345				1,426				300
Expected return on plan assets			(982	)			(54	)			(989	)			(24	)
Net actuarial loss (gain)			—				—				—				—
Settlement loss (gain)			(71	)			—				(800	)			—
Settlement expense			—				—				—				—
Total net periodic pension cost		$	446			$	586			$	(210	)		$	425


		For the Nine Months Ended
		September 27, 2026								September 28, 2025
		United States				Foreign				United States				Foreign
		(in thousands)
Service cost		$	427			$	897			$	462			$	437
Interest cost			4,074				1,046				4,299				892
Expected return on plan assets			(2,932	)			(163	)			(2,970	)			(71	)
Net actuarial loss (gain)			(43	)			—				41				—
Settlement loss (gain)			(71	)			—				(800	)			—
Settlement expense			—				—				—				—
Total net periodic pension cost		$	1,455			$	1,780			$	1,032			$	1,258

Postretirement Benefit Plans

Net Periodic Pension and Postretirement Benefit Costs

For the three and nine months ended September 27, 2026, and September 28, 2025, Teradyne’s net periodic postretirement benefit cost was comprised of the following:


		For the Three Months Ended								For the Nine Months Ended
		September 27, 2026				September 28, 2025				September 27, 2026				September 28, 2025
		(in thousands)								(in thousands)
Service cost		$	7			$	9			$	22			$	27
Interest cost			67				76				200				229
Amortization of prior service credit			(1	)			(2	)			(4	)			(7	)
Special termination benefits			—				—				—				684
Net actuarial loss (gain)			—				—				(114	)			87
Total net periodic postretirement benefit cost		$	73			$	83			$	105			$	1,020