401(k) · DOL Form 5500 · 2024
Alnylam Pharmaceuticals, Inc. 401(k) Plan
Data updated 2026-08-25
- $344M
- Total assets Above avg plan size
- 1,689
- Participants Near avg headcount
- 96th
- Percentile by assets National rank
- $203,668
- Avg per participant Above avg balance/head
Official DOL plan name: Alnylam Pharmaceuticals, Inc. Savings & Investment Plan · Sponsored by Alnylam Pharmaceuticals, Inc. · Massachusetts · Professional & Technical Services
$344M in assets, 1,689 participants
Alnylam Pharmaceuticals, Inc.'s Alnylam Pharmaceuticals, Inc. Savings & Investment Plan reported $344M in total assets and 1,689 participants in its 2024 DOL Form 5500 filing, ranking in the 96th percentile by assets among filed plans. Figures are as reported by the plan sponsor to the Department of Labor, not audited or endorsed by PlainRetire.
- #19,608 in Professional & Technical Services (20,173 peers)
Coverage in Massachusetts
Alnylam Pharmaceuticals, Inc. Savings & Investment Plan covers 1,689 participants in Massachusetts, 2.6x the typical Massachusetts plan (state average ~659 per filing). Assets: $344M.
- #19,608
- in Professional & Technical Services (20,173 peers)
- +24.8%
- assets growth YoY
- 3.5×
- vs typical plan assets (national mean)
Alnylam Pharmaceuticals, Inc. Savings & Investment Plan's outsized position by total assets
Alnylam Pharmaceuticals, Inc. Savings & Investment Plan vs every filed plan by assets
End-of-year total assets · plan year 2024 · DOL Form 5500
$343,996,084 Top 4% higher than 96% of 123,620 filed plans
Dashed line + filled bar = this entry, among filed plans.
Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2024
Alnylam Pharmaceuticals, Inc. Savings & Investment Plan's large-plan peer group by participant headcount
Plan-year 2024 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Alnylam Pharmaceuticals, Inc. Savings & Investment Plan lands in the large band (1,689 participants).
What changed between DOL Form 5500 filings
plan year 2023 → plan year 2024
- Alnylam Pharmaceuticals, Inc. Savings & Investment Plan end-of-year assets rose from $276M in the plan year 2023 filing to $344M in the plan year 2024 filing.
- Alnylam Pharmaceuticals, Inc. Savings & Investment Plan reported net income rose from $65M in the plan year 2023 filing to $68M in the plan year 2024 filing.
- Alnylam Pharmaceuticals, Inc. Savings & Investment Plan reported participants rose from 1,639 in the plan year 2023 filing to 1,689 in the plan year 2024 filing.
Published 5500 schedule card
Filing strip 043696884 · Alnylam Pharmaceuticals, Inc. PY 2024 · 401(k)
Alnylam Pharmaceuticals, Inc. Savings & Investment Plan · $344M · 1,689 · 96th
- BOY $344M
- BOY 1,689
- BOY 96th
- BOY 401(k)
- BOY near Sarah Bush Lincoln Health Center Employee Retirement Plan
- BOY ind #19608
Stamps derive from this plan's Form 5500 line items (assets, participants, type, EIN, cohort placement) - not a quality rating of the sponsor. Read with Professional & Technical Services retirement plans → · Plans in Massachusetts →
Alnylam Pharmaceuticals, Inc. Savings & Investment Plan in the asset neighbourhood
Massachusetts filing particulars
| Total Assets (Beginning of Year) | $276M |
|---|---|
| Net Assets (End of Year) | $344M |
| Net Income | $68M |
| Employer EIN | 043696884 |
| Plan Effective Date | 2003-01-01 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (Alnylam Pharmaceuticals, Inc.)
Sponsor-wide plan assets over time
All Alnylam Pharmaceuticals, Inc. plans reported in each filing year
- Latest sponsor-wide plan assets
- $344M 63.6764505489773% vs 2022
- 2024 filing year
| Year | Plans | Participants | Total Assets |
|---|---|---|---|
| 2022 | 1 | 1,314 | $210M |
| 2023 | 1 | 1,639 | $276M |
| 2024 | 1 | 1,689 | $344M |
Nearby 401(k) Plans in Massachusetts
Peer 401(k) plans, same state, same plan type, ranked by total assets.
- Fidelity Retirement Savings Plan $34.2B · 66,907
- Liberty Mutual 401(k) Plan $11.4B · 34,618
- Massachusetts Institute of Technology Supplemental 401(k) Plan $7.7B · 14,762
- Boston Scientific Corporation 401(k) Retirement Savings Plan $6.8B · 20,639
- State Street Salary Savings Program $6.5B · 12,777
Alnylam Pharmaceuticals, Inc. Savings & Investment Plan's out-of-state 401(k) peers by assets and headcount
Outside Massachusetts, the nearest 401(k) by assets is Sarah Bush Lincoln Health Center Employee Retirement Plan in IL ($344M); by covered participants it is Fgny Parentco. LLC 401(k) Profit Sharing Plan & Trust in NY (1,689 participants). Same-state nearby plans are listed separately above.
Closest by plan assets
Nearest other-state filings by tot_assets_eoy ($344M here).
- Sarah Bush Lincoln Health Center Employee Retirement Plan (IL) $344M · 3,157
- The United States Pharmacopeial Convention 401(k) Savings Plan (MD) $344M · 890
- Noble Services Company LLC 401(k) and Profit Sharing Plan (TX) $344M · 1,438
- Ttec 401(k) Profit Sharing Plan (CO) $344M · 23,163
Similar participant headcount
Nearest other-state filings by covered participants (1,689 participants); asset peers above are excluded.
- Fgny Parentco. LLC 401(k) Profit Sharing Plan & Trust (NY) 1,689 · 0 off
- Braga Ranch 401(k) Plan (CA) 1,689 · 0 off
- Terumo Bct, Inc. 401(k) Plan (CO) 1,689 · 0 off
- Midco 401(k) Plan (MN) 1,689 · 0 off
DOL Form 5500 plan year 2024. Asset totals can differ widely at the same headcount; neither axis is a quality rating.