Biogen 401(k) plan

Biogen Inc., Cambridge, MA. EIN 33-0112644. Annual reports 2009–2024. Also filed as Biogen Idec Inc.

Biogen Inc. has one active retirement plan on file, the Biogen 401(k) Savings Plan, with 7,813 participants and $2.2 billion in assets in 2024. Fidelity has been its recordkeeper since 2009. No traditional pension plan appears in Biogen's filings since 2009.

Active plans: 1
Participants: 7,813
Plan assets: $2.2 billion
401(k) recordkeeper: Fidelity
Plans on file: 1
Industry: Manufacturing

The plan

Biogen 401(k) Savings Plan

401(k)Active

Active. The plan filed its annual report for the 2024 plan year.

Plan number: 001Employer EIN 33-0112644
Participants (2024): 7,813
Net assets (2024): $2.2 billion
Recordkeeper: Fidelity2009–2024
Plan administrator: Biogen Inc.
225 Binney Street
Cambridge, MA 02142
(617) 679-2000As filed for 2024
In effect since: January 6, 2004

Earlier sponsor: Biogen Idec Inc. (2009–2014).

Earlier plan names: Biogen Idec 401(k) Savings Plan.

Year by year, 2009 to 2024

Plan year	Participants	Net assets	Recordkeeper
2024	7,813	$2.2 billion	Fidelity
2023	8,088	$1.9 billion	Fidelity
2022	8,349	$1.6 billion	Fidelity
2021	8,420	$2.0 billion	Fidelity
2020	8,247	$1.7 billion	Fidelity
2019	7,255	$1.3 billion	Fidelity
2018	6,878	$1.0 billion	Fidelity
2017	6,674	$1.1 billion	Fidelity
2016	6,585	$940 million	Fidelity
2015	6,632	$873 million	Fidelity
2014	6,381	$824 million	Fidelity
2013	5,937	$716 million	Fidelity
2012	5,514	$530 million	Fidelity
2011	4,920	$440 million	Fidelity
2010	4,775	$452 million	Fidelity
2009	4,708	$355 million	Fidelity

If you had money in one of these plans

Call Fidelity (fidelity.com), which runs the Biogen 401(k) Savings Plan. With your Social Security number and the plan name, it can tell you whether you still have a balance and, if not, where it went.
Or call the plan administrator listed on the plan below ((617) 679-2000). That number was filed for 2024; ask for the benefits or retirement plan office.
Still stuck? The Department of Labor's benefits advisers help for free: askebsa.dol.gov or 1-866-444-3272. Never pay anyone to find your own money.

What these numbers are

They come from the Form 5500 annual reports each plan files with the Department of Labor, as the plan filed them. A plan year is usually a calendar year.
Participants counts everyone in the plan at year end: current employees, former employees who still have a balance or a pension coming, and retirees or beneficiaries being paid.
The recordkeeper is the service provider whose Schedule C entry says it keeps the plan's records. Small plans do not file Schedule C, so some plans show none.
We cannot see anyone's account. Only the plan or its recordkeeper can tell you your balance.

Sources: U.S. Department of Labor, Form 5500 datasets and PBGC trusteed plans. How we read them.

The plan

Biogen 401(k) Savings Plan

If you had money in one of these plans

What these numbers are

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