401(k) · DOL Form 5500 · 2023
Alnylam Pharmaceuticals, Inc. 401(k) Plan
Data updated 2026-08-25
- $276M
- Total assets Near avg plan size
- 1,639
- Participants Near avg headcount
- 96th
- Percentile by assets National rank
- $168,161
- 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
$276M in assets, 1,639 participants
Alnylam Pharmaceuticals, Inc.'s Alnylam Pharmaceuticals, Inc. Savings & Investment Plan reported $276M in total assets and 1,639 participants in its 2023 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.
- #19,707 in Professional & Technical Services (20,321 peers)
Coverage in Massachusetts
Alnylam Pharmaceuticals, Inc. Savings & Investment Plan covers 1,639 participants in Massachusetts, 2.5x the typical Massachusetts plan (state average ~659 per filing). Assets: $276M.
- #19,707
- in Professional & Technical Services (20,321 peers)
- +31.1%
- assets growth YoY
- 2.8×
- 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 2023 · DOL Form 5500
$275,616,093 Top 4% higher than 96% of 127,068 filed plans
Dashed line + filled bar = this entry, among filed plans.
Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2023
Alnylam Pharmaceuticals, Inc. Savings & Investment Plan's large-plan peer group by participant headcount
Plan-year 2023 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 (1,639 participants).
What changed between DOL Form 5500 filings
plan year 2022 → plan year 2023
- Alnylam Pharmaceuticals, Inc. Savings & Investment Plan reported net income rose from -$3M in the plan year 2022 filing to $65M in the plan year 2023 filing.
- Alnylam Pharmaceuticals, Inc. Savings & Investment Plan end-of-year assets rose from $210M in the plan year 2022 filing to $276M in the plan year 2023 filing.
- Alnylam Pharmaceuticals, Inc. Savings & Investment Plan reported participants rose from 1,314 in the plan year 2022 filing to 1,639 in the plan year 2023 filing.
Published 5500 schedule card
Filing strip 043696884 · Alnylam Pharmaceuticals, Inc. PY 2023 · 401(k)
Alnylam Pharmaceuticals, Inc. Savings & Investment Plan · $276M · 1,639 · 96th
- NET $276M
- BOOK 1,639
- VS-ST 96th
- BOY 401(k)
- SCH near Children's Health System, Inc. 401(k) Plan
- EBSA ind #19707
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) | $210M |
|---|---|
| Net Assets (End of Year) | $276M |
| Net Income | $65M |
| 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 $28.6B · 62,289
- Liberty Mutual 401(k) Plan $10.6B · 37,052
- Massachusetts Institute of Technology Supplemental 401(k) Plan $6.8B · 14,094
- Boston Scientific Corporation 401(k) Retirement Savings Plan $5.8B · 19,881
- Philips North America 401(k) Plan $5.8B · 19,120
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 Children's Health System, Inc. 401(k) Plan in VA ($275M); by covered participants it is Osi Systems, Inc. 401(k) Savings Plan in CA (1,639 participants). Same-state nearby plans are listed separately above.
Closest by plan assets
Nearest other-state filings by tot_assets_eoy ($276M here).
- Children's Health System, Inc. 401(k) Plan (VA) $275M · 3,891
- State Bankshares 401(k) Profit Sharing Plan (ND) $275M · 1,942
- Sally Beauty 401(k) and Profit Sharing Plan (TX) $275M · 17,873
- Midwest Radiology P.a. Profit Sharing Plan (MN) $275M · 380
Similar participant headcount
Nearest other-state filings by covered participants (1,639 participants); asset peers above are excluded.
- Osi Systems, Inc. 401(k) Savings Plan (CA) 1,639 · 0 off
- Applied Systems, Inc. Retirement Savings Plan (IL) 1,639 · 0 off
- Coherent Corp. 401(k) Profit Sharing Plan (CA) 1,639 · 0 off
- Wcg 401(k) Plan (NJ) 1,639 · 0 off
DOL Form 5500 plan year 2023. Asset totals can differ widely at the same headcount; neither axis is a quality rating.