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  2. Mersana Therapeutics, Inc.
  • Benefits analytics
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  • Health & Benefits plans

Filings through Oct 24, 2026.

Mersana Therapeutics, Inc.

EIN 04-3562403-biotechnology-Latest filing 2025
Plans
2
Retirement
1
$32.6M assets
Health & Benefits
1
$2.5M premiums
Participants
252
1800 SIERRA POINT PARKWAY, SUITE 200 - BRISBANE, CA 94005617-715-8200mersana.comLinkedIn51-200 employeesbiotechnology
Plans on this EIN
2 filings
#001401(k)-$32.6M - 184 part#501Fully insured-$2.5M - 367 lives

Health & Benefits portfolio - carriers, brokers and premium across this company's health and benefits plan.

Benefits portfolio analytics

1 plan / $2.5M premiums / 367 covered lives

Coverage by line

Premium dollars by benefit type (bundled lines overlap)

  • Health$2.3M
  • Dental$2.3M
  • Prescription drug$2.3M
  • Other$232K
  • Life$205K
  • Short-term disability$192K
  • +2 more
Total $2.5M8 rows
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Plan summaries

Each card links to its plan page. The plan page shows fees vs peers, audit grade, history and counterparties.

Retirement#001

MERSANA THERAPEUTICS, INC. 401(K) PROFIT SHARING PLAN TRUST

401(k)

Assets$32.6M
Participants184
On the plan page
Fees vs peersAudit gradeAsset trajectoryContributionsSch C providers
Open plan
Health & Benefits#501

MERSANA THERAPEUTICS GROUP HEALTH & WELFARE PLAN

Fully insured - BLUE CROSS BLUE SHIELD OF MASSACHUSETTS, INC.

Premiums$2.5M
Covered lives367
On the plan page
Premium breakdownCarriersBrokersCoverage stats
Open plan

Retirement plans

1 plan on this EIN

PlanNameTypeAssetsParticipantsLatest year
#001MERSANA THERAPEUTICS, INC. 401(K) PROFIT SHARING PLAN TRUST401(k)$32.6M1842025
  • MERSANA THERAPEUTICS, INC. 401(K) PROFIT SHARING PLAN TRUST$32.6M
    #001 · 401(k) · 2025184

Health & Benefits plans

1 plan on this EIN

PlanNameFundingCarrierPremiumsCoveredLatest year
#501MERSANA THERAPEUTICS GROUP HEALTH & WELFARE PLANFully insuredBLUE CROSS BLUE SHIELD OF MASSACHUSETTS, INC.$2.5M3672025
  • MERSANA THERAPEUTICS GROUP HEALTH & WELFARE PLAN$2.5M
    #501 · Fully insured · BLUE CROSS BLUE SHIELD OF MASSACHUSETTS, INC. · 2025367
Retirement plans
Health & Benefits plans

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