Retirement Plans (Tables)

6 Months Ended

Jun. 29, 2025

Net Periodic Pension and Postretirement Benefit Costs

For the three and six months ended June 29, 2025, and June 30, 2024, Teradyne’s net periodic pension cost was comprised of the following:

	For the Three Months Ended
	June 29, 2025						June 30, 2024
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	96		$	150		$	217		$	114
Interest cost		1,165			301			1,646			243
Expected return on plan assets		(665	)		(25	)		(1,265	)		(18	)
Net actuarial loss (gain)		41			—			111			(242	)
Settlement loss (gain)		—			—			—			(24	)
Total net periodic pension cost	$	637		$	426		$	709		$	73

	For the Six Months Ended
	June 29, 2025						June 30, 2024
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	309		$	289		$	448		$	231
Interest cost		2,873			595			3,293			489
Expected return on plan assets		(1,981	)		(50	)		(2,533	)		(34	)
Net actuarial loss (gain)		41			—			111			(242	)
Settlement loss (gain)		—			—			—			(24	)
Total net periodic pension cost	$	1,242		$	834		$	1,319		$	420

Postretirement Benefit Plans

Net Periodic Pension and Postretirement Benefit Costs

For the three and six months ended June 29, 2025, and June 30, 2024, Teradyne’s net periodic postretirement benefit cost was comprised of the following:

	For the Three Months  Ended						For the Six Months  Ended
	June 29, 2025			June 30, 2024			June 29, 2025			June 30, 2024
	(in thousands)						(in thousands)
Service cost	$	8		$	9		$	18		$	18
Interest cost		80			72			153			145
Amortization of prior service credit		(2	)		(2	)		(4	)		(4	)
Special termination benefits		—			170			684			462
Net actuarial loss (gain)		87			(94	)		87			(94	)
Total net periodic postretirement benefit cost	$	173		$	155		$	938		$	527