401(k) · DOL Form 5500 · 2022
Biogen Inc. 401(k) Plan
Data updated 2026-08-11
- $1.6B
- Total assets
- 5,611
- Participants
- 99th
- Percentile by assets
- $285,377
- Avg per participant
Official DOL plan name: Biogen 401(k) Savings Plan · Sponsored by Biogen Inc. · Massachusetts · Manufacturing
$1.6B in assets, 5,611 participants
Biogen Inc.'s Biogen 401(k) Savings Plan reported $1.6B in total assets and 5,611 participants in its 2022 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.
- 99th percentile by assets (of 139,126 plans)
- #20,331 in Manufacturing (20,602 peers)
Coverage in Massachusetts
Biogen 401(k) Savings Plan covers 5,611 participants in Massachusetts, 8.5x the typical Massachusetts plan (state average ~659 per filing). Assets: $1.6B.
- $1.6B
- total plan assets (2022 EOY)
- 5,611
- covered participants
- 99th
- percentile by assets (of 139,126 plans)
- $285,377
- avg assets per participant
The plan reported a net loss of $408M for the year, a single-year figure driven by markets and benefit payments, not a measure of plan health.
Participants vs Massachusetts filers
In Massachusetts, the average filing covers about 659 participants across 4,265 plans. Biogen 401(k) Savings Plan reports 5,611 participants - 8.5x that state average ($1.6B EOY assets).
Massachusetts filing particulars
| Total Assets (Beginning of Year) | $2.0B |
|---|---|
| Net Assets (End of Year) | $1.6B |
| Net Income | -$408M |
| Employer EIN | 330112644 |
| Plan Effective Date | 2004-01-06 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (Biogen Inc.)
| 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.
Biogen 401(k) Savings Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants
- Fidelity Retirement Savings Plan $23.0B · 52,036
- Liberty Mutual 401(k) Plan $8.8B · 32,843
- Massachusetts Institute of Technology Supplemental 401(k) Plan $5.8B · 13,690
- Philips North America 401(k) Plan $5.2B · 19,750
- Boston Scientific Corporation 401(k) Retirement Savings Plan $4.9B · 18,359
Scale composition for Biogen 401(k) Savings Plan
Biogen 401(k) Savings Plan reports $1.6B in end-of-year assets across 5,611 participants (0.013% of the $12.3T held by all Form 5500 filers in the national rollup , and 0.006% of 93,925,755 covered participants) - about $285,377 per participant (2.1x the national average assets-per-participant) . Net income for plan year 2022 was -$408M.
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 | This page |
| 2023 | 5,003 | $1.9B | Open filing |
| 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)
Similar-Sized 401(k) Plans Nationally
401(k) plans in other states closest to Biogen 401(k) Savings Plan by total assets, not by location.
- Ryder System, Inc. 401(k) Savings Plan (FL) $1.6B · 35,189
- Westinghouse Electric Company Savings Plan (PA) $1.6B · 4,804
- Llns 401(k) Retirement Plan (CA) $1.6B · 6,682
- Paypal 401(k) Savings Plan (CA) $1.6B · 13,355
Frequently Asked Questions
How did Biogen 401(k) Savings Plan assets move in 2022? ▼
How have Biogen Inc. plan assets changed over time? ▼
Where does Biogen 401(k) Savings Plan rank by assets among Form 5500 filers? ▼
Which 401(k) plans are similar in size to Biogen 401(k) Savings Plan? ▼
Next read for Biogen 401(k) Savings Plan
Filing takeaways
Ways to act on Biogen 401(k) Savings Plan's numbers.
- By total assets, Biogen 401(k) Savings Plan ranks among the largest 1% of all filed plans. See the largest plans
- Compare it side-by-side against 3 similar 401(k) plans in Massachusetts. Compare plans
- Biogen Inc.'s sponsor-wide assets have grown 34.8% since 2022 across 3 plan years on file. More Manufacturing plans