401(k) · DOL Form 5500 · 2023
Biogen Inc. 401(k) Plan
Data updated 2026-08-25
- $1.9B
- Total assets Very large vs avg
- 5,003
- Participants Above avg headcount
- 99th
- Percentile by assets National rank
- $387,385
- Avg per participant High balance/head
Official DOL plan name: Biogen 401(k) Savings Plan · Sponsored by Biogen Inc. · Massachusetts · Manufacturing
$1.9B in assets, 5,003 participants
Biogen Inc.'s Biogen 401(k) Savings Plan reported $1.9B in total assets and 5,003 participants in its 2023 DOL Form 5500 filing, ranking in the 99th 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.
- #18,470 in Manufacturing (18,722 peers)
Coverage in Massachusetts
Biogen 401(k) Savings Plan covers 5,003 participants in Massachusetts, 7.6x the typical Massachusetts plan (state average ~659 per filing). Assets: $1.9B.
- #18,470
- in Manufacturing (18,722 peers)
- +21.0%
- assets growth YoY
- 19×
- vs typical plan assets (national mean)
Biogen 401(k) Savings Plan's outsized position by total assets
Biogen 401(k) Savings Plan vs every filed plan by assets
End-of-year total assets · plan year 2023 · DOL Form 5500
$1,938,085,017 Top 1% higher than 99% 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
Biogen 401(k) Savings 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. Biogen 401(k) Savings Plan lands in the large band (5,003 participants).
What changed between DOL Form 5500 filings
plan year 2022 → plan year 2023
- Biogen 401(k) Savings Plan reported net income rose from -$408M in the plan year 2022 filing to $303M in the plan year 2023 filing.
- Biogen 401(k) Savings Plan end-of-year assets rose from $1.6B in the plan year 2022 filing to $1.9B in the plan year 2023 filing.
- Biogen 401(k) Savings Plan reported participants fell from 5,611 in the plan year 2022 filing to 5,003 in the plan year 2023 filing.
Plan-year Form 5500 strip
Filing strip 330112644 · Biogen Inc. PY 2023 · 401(k)
Biogen 401(k) Savings Plan · $1.9B · 5,003 · 99th
- BOOK $1.9B
- VS-ST 5,003
- BOY 99th
- SCH 401(k)
- EBSA near Park Nicollet Health Services 401(k) Retirement Savings Plan
- PART ind #18470
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 Manufacturing retirement plans → · Plans in Massachusetts →
Biogen 401(k) Savings Plan in the asset neighbourhood
Massachusetts filing particulars
| Total Assets (Beginning of Year) | $1.6B |
|---|---|
| Net Assets (End of Year) | $1.9B |
| Net Income | $303M |
| Employer EIN | 330112644 |
| Plan Effective Date | 2004-01-06 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (Biogen Inc.)
Sponsor-wide plan assets over time
All Biogen Inc. plans reported in each filing year
- Latest sponsor-wide plan assets
- $2.2B 34.84383057226459% vs 2022
- 2024 filing year
| Year | Plans | Participants | Total Assets |
|---|---|---|---|
| 2022 | 1 | 5,611 | $1.6B |
| 2023 | 1 | 5,003 | $1.9B |
| 2024 | 1 | 4,292 | $2.2B |
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
Scale composition for Biogen 401(k) Savings Plan
Biogen 401(k) Savings Plan reports $1.9B in end-of-year assets across 5,003 participants (0.016% of the $12.3T held by all Form 5500 filers in the national rollup , and 0.005% of 93,925,755 covered participants) - about $387,385 per participant (2.8x the national average assets-per-participant) . Net income for plan year 2023 was $303M.
This plan identity (EIN 330112644, plan #001) has 3 Form 5500 filings on file from 2022 to 2024 , with end-of-year assets moving from $1.6B to $2.2B (+34.8%) while covered participants moved from 5,611 to 4,292 . Single-year sparse filers cannot show that trail.
| Plan year | Participants | EOY assets | Filing |
|---|---|---|---|
| 2022 | 5,611 | $1.6B | Open filing |
| 2023 | 5,003 | $1.9B | This page |
| 2024 · index core | 4,292 | $2.2B | Open filing |
The same sponsor also keeps 1 other index-core plan on PlainRetire:
- Biogen 401(k) Savings Plan (401(k), $2.2B, 4,292 participants)
Biogen 401(k) Savings Plan's out-of-state 401(k) peers by assets and headcount
Outside Massachusetts, the nearest 401(k) by assets is Park Nicollet Health Services 401(k) Retirement Savings Plan in MN ($1.9B); by covered participants it is Tmc Healthcare 401(k) Plan in AZ (5,004 participants). Same-state nearby plans are listed separately above.
Closest by plan assets
Nearest other-state filings by tot_assets_eoy ($1.9B here).
- Park Nicollet Health Services 401(k) Retirement Savings Plan (MN) $1.9B · 7,819
- Ryder System, Inc. 401(k) Savings Plan (GA) $1.9B · 40,903
- United Rentals 401(k) Investment Plan (CT) $1.9B · 19,605
- W.R. Berkley Corporation Profit Sharing Plan (CT) $1.9B · 5,905
Similar participant headcount
Nearest other-state filings by covered participants (5,003 participants); asset peers above are excluded.
DOL Form 5500 plan year 2023. Asset totals can differ widely at the same headcount; neither axis is a quality rating.