Biogen Ownership | Who Owns Biogen?

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Biogen Ownership Summary

Biogen is owned by 22.62% institutional investors, 0.15% insiders, and 77.23% retail investors. Vanguard group is the largest institutional shareholder, holding 11.85% of BIIB shares. Vanguard PRIMECAP Inv is the top mutual fund, with 6.14% of its assets in Biogen shares.

BIIB Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Biogen	22.62%	0.15%	77.23%
Sector	Healthcare Stocks	42.50%	10.81%	46.69%
Industry	Drug Manufacturers - General Stocks	27.22%	2.09%	70.69%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	17.29M	11.85%	$2.42B
Primecap management co/ca/	14.95M	10.25%	$2.09B
Blackrock funding, inc. /de	14.76M	10.12%	$2.07B
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	4.07M	2.79%	$567.74M
Point72 asset management	3.87M	2.65%	$542.52M
Invesco	2.42M	1.66%	$338.73M
Norges bank	2.33M	1.60%	$355.57M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Palo alto investors lp	185.66K	4.81%	$26.01M
Hillman capital management	38.35K	3.13%	$5.37M
Sector gamma as	75.47K	2.62%	$10.57M
Sphera funds management	82.74K	2.44%	$11.59M
Patient capital management	396.65K	2.22%	$55.56M
Parkman healthcare partners	130.16K	1.90%	$18.23M
Centre asset management	51.53K	1.80%	$7.88M
Orion investment	39.43K	1.76%	$5.52M
Provident co of the employees of the hebrew university	12.53K	1.75%	$1.75M
Vestal point capital, lp	275.00K	1.74%	$38.52M

Top Buyers

Holder	Shares	% Assets	Change
Norges bank	2.33M	0.05%	2.33M
Blackrock funding, inc. /de	14.76M	0.04%	1.21M
D. e. shaw	1.61M	0.18%	1.17M
Marshall wace, llp	887.66K	0.13%	721.71K
Barclays	1.36M	0.04%	561.77K

Top Sellers

Holder	Shares	% Assets	Change
Ra capital management	-	-	-1.18M
Primecap management co/ca/	14.95M	1.60%	-847.42K
Qube research	121.61K	0.02%	-621.70K
Wellington management group llp	4.25M	0.10%	-551.92K
Orbimed advisors	-	-	-509.10K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	2.33M	0.05%	2.33M	$355.57M
Vestal point capital, lp	275.00K	1.74%	275.00K	$38.52M
Rakuten investment management	198.57K	0.35%	198.57K	$99.14M
Aegon asset management uk	195.63K	0.32%	195.63K	$27.40M
Wedge capital management l l p/nc	192.87K	0.46%	192.87K	$27.02M

Sold Out

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

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Sep 30, 2024	945	-2.68%	126,668,218	-1.13%	86	1.12%	346	-16.63%	374	11.31%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard PRIMECAP Inv	9.00M	6.14%	-5.46K
Vanguard US Total Market Shares ETF	4.62M	3.16%	3.46K
Vanguard Total Stock Mkt Idx Inv	4.61M	3.15%	-104.33K
Vanguard Health Care Inv	4.37M	2.98%	-
Vanguard Institutional 500 Index Trust	4.16M	2.84%	30.48K
Vanguard 500 Index Investor	3.63M	2.47%	-531.25K
Vanguard Mid Cap Index Institutional	3.27M	2.23%	35.19K
Invesco QQQ Trust	3.02M	2.06%	21.00K
Vanguard Capital Opportunity Inv	2.40M	1.64%	57.38K
Fidelity 500 Index	1.86M	1.27%	792.00

Recent Insider Transactions

Date	Name	Role	Activity	Value
Sep 02, 2025	Singhal Priya	Head of Development	Sell	$69.05K
Jul 08, 2025	Izzar Rachid	Head of Global Product Strat.	Sell	$300.11K
May 19, 2025	Singhal Priya	Head of Development	Sell	$480.51K
May 02, 2025	DORSA CAROLINE	-	Buy	$151.56K
Mar 07, 2025	SHERWIN STEPHEN A	-	Sell	$1.31M

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	-
2025 Q3	-	2
2025 Q2	1	1
2025 Q1	-	1
2024 Q4	-	1

BIIB Ownership FAQ

Who Owns Biogen?

Biogen shareholders are primarily institutional investors at 22.62%, followed by 0.15% insiders and 77.23% retail investors. The average institutional ownership in Biogen's industry, Drug Manufacturers - General Stocks, is 27.22%, which Biogen falls below.

Who owns the most shares of Biogen?

Biogen’s largest shareholders are Vanguard group (17.29M shares, 11.85%), Primecap management co/ca/ (14.95M shares, 10.25%), and Blackrock funding, inc. /de (14.76M shares, 10.12%). Together, they hold 32.22% 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 6.14% of its total shares outstanding invested in 9M Biogen shares.

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