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Benefit Plans
12 Months Ended
Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Benefit Plans
401(k) Plan
The Company maintains 401(k) defined contribution plans covering employees in the U.S. The related expense totaled $25.4 million, $21.9 million and $10.1 million in the fiscal years ended December 31, 2023, 2022 and 2021, respectively. During the year ended December 31, 2023, the Company matched employees’ contributions to a maximum of 5% of the employee’s eligible wages for legacy and new Entegris employees. During the year ended December 31, 2023, the Company matched legacy CMC Materials employees’ contributions to a maximum of 6% of each such employee’s eligible wages and those employees were also eligible to receive a 3% non-elective contribution. The Company’s United Kingdom, Singapore and South Korea subsidiaries also make immaterial contributions to retirement plans that function as defined contribution retirement plans.
Defined Benefit Plans
The employees of the Company’s subsidiaries in Japan, Taiwan, South Korea, France and Germany are covered in defined benefit pension plans. The benefit obligation was reduced by $1.4 million due to the EC disposition in the year ended December 31, 2023. On December 31, 2023, the Company converted its South Korea defined pension plans to defined contribution plans. As a result of this conversion, the Company settled and paid out to beneficiaries an amount of $2.3 million on January 2, 2024. The Company uses a December 31 measurement date for its pension plans. A summary of these combined plans are:
(In thousands)20232022
Projected benefit obligation$12,618 $15,253 
Fair value of plan assets1,407 1,014 
Plan assets less benefit obligation - net amount recognized(11,211)(14,239)
Accumulated benefit obligation10,375 12,151 
Cash Flows
Benefits for the combined plans were $1.0 million, $0.7 million and $0.1 million in fiscal years 2023, 2022 and 2021, respectively, consisting primarily of service costs. Net service costs are included in Cost of sales and Operating expenses, and all other costs are recorded in Other expense, net in our Consolidated Statements of Operations. The Company expects to make the following benefit payments:
(In thousands)Payments
2024$700 
2025976 
2026404 
2027453 
2028641 
Years 2029-2033
3,029