OpenERISA

Peter H. Mattson & Co., INC.

Foster City, CA, 94404

EIN 94-2456738
Plans
2
Total participants
598
Filing years
2024, 2023, 2022, 2021, 2020
NAICS
541990
Plan sponsors in CaliforniaProfessional, Scientific & Technical Services

Benefit plans on file

YearFormPlan #Plan nameParticipants
2024Form 5500002Mattson & Co. Employee Stock Ownership Plan58
2024Form 5500003Mattson & Co. 401(K) Savings Plan63
2023Form 5500002Mattson & Co. Employee Stock Ownership Plan61
2023Form 5500003Mattson & Co. 401(K) Savings Plan59
2022Form 5500002Mattson & Co. Employee Stock Ownership Plan61
2022Form 5500003Mattson & Co. 401(K) Savings Plan62
2021Form 5500002Mattson & Co. Employee Stock Ownership Plan55
2021Form 5500003Mattson & Co. 401(K) Savings Plan61
2020Form 5500002Mattson & Co. Employee Stock Ownership Plan59
2020Form 5500003Mattson & Co. 401(K) Savings Plan59

Data shown as filed with the U.S. Department of Labor (EBSA), filing years 2020–2025; not validated by OpenERISA. View official filings for this EIN on the DOL EFAST2 search.

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