Biogen Ownership | Who Owns Biogen?

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Biogen Ownership Summary

Biogen is owned by 40.91% institutional investors, 0.16% insiders, and 58.93% retail investors. Vanguard group is the largest institutional shareholder, holding 11.90% of BIIB shares. Vanguard PRIMECAP Inv is the top mutual fund, with 5.70% of its assets in Biogen shares.

BIIB Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Biogen	40.91%	0.16%	58.93%
Sector	Healthcare Stocks	231.98%	10.74%	-142.72%
Industry	Drug Manufacturers - General Stocks	26.93%	1.98%	71.09%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	17.45M	11.90%	$3.07B
Blackrock funding, inc. /de	14.81M	10.10%	$2.61B
Primecap management co/ca/	14.76M	10.06%	$2.60B
Blackrock	14.54M	10.01%	$3.37B
State street	7.32M	5.02%	$1.03B
Wellington management group llp	4.25M	2.91%	$594.85M
Geode capital management	4.20M	2.86%	$736.43M
Point72 asset management	3.87M	2.65%	$542.52M
Norges bank	2.64M	1.80%	$464.41M
Invesco	2.42M	1.66%	$338.73M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Palo alto investors lp	185.66K	4.81%	$26.01M
Sector gamma as	85.47K	3.43%	$15.04M
Hillman capital management	38.35K	3.13%	$5.37M
Sphera funds management	82.74K	2.44%	$11.59M
Privium fund management b.v.	73.48K	2.38%	$12.93M
Provident co of the employees of the hebrew university	12.53K	2.29%	$2.20M
Patient capital management	396.65K	2.22%	$55.56M
Orion investment	39.40K	2.11%	$6.93M
Old north state wealth management	23.81K	1.97%	$4.19M
Primecap management co/ca/	14.76M	1.97%	$2.60B

Top Buyers

Holder	Shares	% Assets	Change
Norges bank	2.64M	0.05%	2.64M
D. e. shaw	1.61M	0.18%	1.17M
Marshall wace, llp	887.66K	0.13%	721.71K
Jpmorgan chase	1.86M	0.02%	588.91K
Caisse de depot et placement du quebec	569.25K	0.14%	499.68K

Top Sellers

Holder	Shares	% Assets	Change
Pacer advisors	-	-	-1.45M
Ra capital management	-	-	-1.18M
Qube research	121.61K	0.02%	-621.70K
Renaissance	399.20K	0.11%	-565.21K
Wellington management group llp	4.25M	0.10%	-551.92K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	2.64M	0.05%	2.64M	$464.41M
Vestal point capital, lp	275.00K	1.74%	275.00K	$38.52M
Artemis investment management llp	226.84K	0.48%	226.84K	$39.92M
Rakuten investment management	198.57K	0.35%	198.57K	$99.14M
Parkman healthcare partners	130.16K	1.90%	130.16K	$18.23M

Sold Out

Holder	Change
Hm payson	-1.00
Brown, lisle/cummings	-1.00
Valued wealth advisors	-1.00
Palisade asset management	-1.00
Mcclarren financial advisors	-2.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2025	624	-34.52%	59,972,123	-54.07%	40	0.51%	307	-31.78%	173	-34.47%
Sep 30, 2025	486	-45.58%	33,008,698	-73.12%	22	0.32%	229	-46.99%	121	-52.36%
Jun 30, 2025	893	-2.40%	129,663,254	2.13%	88	1.18%	434	-5.45%	252	-1.95%
Mar 31, 2025	905	-0.77%	126,690,015	-3.57%	86	1.07%	450	6.38%	258	-18.61%
Dec 31, 2024	876	-8.46%	130,920,905	3.18%	89	1.18%	401	14.24%	306	-20.10%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard PRIMECAP Inv	8.36M	5.70%	-92.90K
Vanguard Total Stock Mkt Idx Inv	4.63M	3.16%	10.25K
Vanguard US Total Market Shares ETF	4.62M	3.16%	3.46K
Vanguard Institutional 500 Index Trust	4.16M	2.84%	30.48K
Vanguard 500 Index Investor	3.74M	2.55%	23.09K
Vanguard Mid Cap Index Institutional	3.18M	2.17%	-16.76K
Invesco QQQ Trust	3.02M	2.06%	21.00K
Vanguard Health Care Inv	2.91M	1.99%	-700.24K
Vanguard Capital Opportunity Inv	2.33M	1.59%	-3.99K
Fidelity Contrafund	2.12M	1.44%	303.00K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Feb 12, 2026	Murphy Nicole	Head of Pharm Ops and Tech	Buy	$585.11
Feb 09, 2026	Singhal Priya	Head of Development	Sell	$531.55K
Feb 02, 2026	Singhal Priya	Head of Development	Sell	$134.12K
Sep 02, 2025	Singhal Priya	Head of Development	Sell	$69.05K
Jul 08, 2025	Izzar Rachid	Head of Global Product Strat.	Sell	$300.11K

Insider Transactions Trends

Date	Buy	Sell
2026 Q1	-	2
2025 Q4	-	-
2025 Q3	-	2
2025 Q2	1	1
2025 Q1	-	1

BIIB Ownership FAQ

Who Owns Biogen?

Biogen shareholders are primarily institutional investors at 40.91%, followed by 0.16% insiders and 58.93% retail investors. The average institutional ownership in Biogen's industry, Drug Manufacturers - General Stocks, is 26.93%, which Biogen exceeds.

Who owns the most shares of Biogen?

Biogen’s largest shareholders are Vanguard group (17.45M shares, 11.90%), Blackrock funding, inc. /de (14.81M shares, 10.10%), and Primecap management co/ca/ (14.76M shares, 10.06%). Together, they hold 32.06% of Biogen’s total shares outstanding.

Does Blackrock own Biogen?

Yes, BlackRock owns 10.01% of Biogen, totaling 14.54M shares as of Jun 2024. This represents 0.08% of BlackRock's total assets, with a market value of 3.37B$. In the last quarter, BlackRock increased its holdings by 393.51K shares, a 2.78% change.

Who is Biogen’s biggest shareholder by percentage of total assets invested?

Palo alto investors lp is Biogen’s biggest shareholder by percentage of total assets invested, with 4.81% of its assets in 185.66K Biogen shares, valued at 26.01M$.

Who is the top mutual fund holder of Biogen shares?

Vanguard PRIMECAP Inv is the top mutual fund holder of Biogen shares, with 5.70% of its total shares outstanding invested in 8.36M Biogen shares.

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