Biogen 401(k) Savings Plan
ERISA Form 5500 plan record drawn from DOL EBSA — verify with linked source filings below.
Sponsored by Biogen Inc. · Massachusetts · Manufacturing
What the 2023 filing shows
Biogen 401(k) Savings Plan holds $1.9B for 5,003 participants - about $387,385 per participant, up 21.0% over the 2023 plan year.
- $1.9B
- total plan assets (2023 EOY)
- 5,003
- covered participants
- $387,385
- avg assets per participant
- +21.0%
- assets growth YoY
What the Filing Says About Biogen 401(k) Savings Plan
Biogen 401(k) Savings Plan is a 401(k) retirement plan sponsored by Biogen Inc., headquartered in Massachusetts. As of the 2023 Form 5500 filing, the plan reports $1.9B in total end-of-year assets and covers 5,003 participants across the Manufacturing industry. The sponsor's EIN on file with the U.S. Department of Labor is 330112644, and the plan has been effective since 2004-01-06. Its filing status is currently FILING RECEIVED.
Year over year, total assets moved from $1.6B at the beginning of 2023 to $1.9B at year-end — a gain of 21.0%. Net assets (after liabilities) closed the year at $1.9B, with reported net income of $303M driven by investment returns, contributions received, and benefit payments during the period. These figures reflect what the plan administrator certified on Schedule H or Schedule I of the Form 5500 annual return and can be compared against 2 prior plan-year filings from the same sponsor shown below.
Asset totals and participant counts reflect a single plan year snapshot and can change materially with market conditions, plan mergers, or workforce changes. Fields such as "net income" include both realized investment performance and contribution/distribution flows — a single-year figure does not by itself indicate plan health or participant outcomes. This page summarizes public DOL disclosures for research and educational purposes only and is not retirement, tax, legal, or financial advice. Before making decisions about your own retirement benefits or evaluating an employer's plan, verify the underlying filing directly via the DOL EFAST2 system and consult a qualified professional.
Financial Summary (2023)
| Total Assets (Beginning of Year) | $1.6B |
| Total Assets (End of Year) | $1.9B |
| Net Assets (End of Year) | $1.9B |
| Net Income | $303M |
| Plan Type | 401(k) |
| 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.
- Fidelity Retirement Savings Plan $28.6B · 62,289
- Consolidated 403(b) Program of Mass General Brigham and Member Organizations $14.9B · 74,212
- 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
Related Data
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Frequently Asked Questions
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Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2023.
Source: DOL EFAST2 filing system (efast.dol.gov) — original filing retrieval by EIN 330112644.
Reference: IRS Publication 560 — Retirement Plans for Small Business, contribution-limit rules.
Reference: IRS Publication 590-B — Distributions from IRAs, RMD rules under SECURE Act 2.0.
Read our methodology — how this data is sourced, computed, and verified.