401(k) · DOL Form 5500 · 2023
Biogen Inc. 401(k) Plan
Data updated 2026-08-11
- $1.9B
- Total assets
- 5,003
- Participants
- 99th
- Percentile by assets
- $387,385
- Avg per participant
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.
- 99th percentile by assets (of 127,072 plans)
- #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.
- $1.9B
- total plan assets (2023 EOY)
- 5,003
- covered participants
- 99th
- percentile by assets (of 127,072 plans)
- $387,385
- avg assets per participant
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.
Participants vs Massachusetts filers
In Massachusetts, the average filing covers about 659 participants across 4,265 plans. Biogen 401(k) Savings Plan reports 5,003 participants - 7.6x that state average ($1.9B EOY assets).
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.)
| 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 $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)
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.
- 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
Frequently Asked Questions
How did Biogen 401(k) Savings Plan assets move in 2023? ▼
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