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