OpenERISA

Mersana Therapeutics, INC.

Cambridge, MA, 02139

EIN 04-3562403
Plans
2
Total participants
1,331
Filing years
2024, 2023, 2022, 2021, 2020
NAICS
541990
Plan sponsors in MassachusettsProfessional, Scientific & Technical Services

Benefit plans on file

YearFormPlan #Plan nameParticipants
2024Form 5500001Mersana Therapeutics, INC. 401(K) Profit Sharing Plan Trust104
2024Form 5500501Mersana Therapeutics Group Health & Welfare Plan51
2023Form 5500001Mersana Therapeutics, INC. 401(K) Profit Sharing Plan Trust122
2023Form 5500501Mersana Therapeutics Group Health & Welfare Plan110
2022Form 5500001Mersana Therapeutics, INC. 401(K) Profit Sharing Plan Trust231
2022Form 5500501Mersana Therapeutics Group Health & Welfare Plan252
2021Form 5500001Mersana Therapeutics, INC. 401(K) Profit Sharing Plan Trust163
2021Form 5500501Mersana Therapeutics Group Health & Welfare Plan196
2020Form 5500001Mersana Therapeutics, INC. 401(K) Profit Sharing Plan Trust102

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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