Biogen Ownership | Who Owns Biogen?

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Biogen Ownership Summary

Biogen is owned by 88.87% institutional investors, 0.15% insiders, and 10.98% retail investors. Vanguard group is the largest institutional shareholder, holding 11.50% 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	88.87%	0.15%	10.98%
Sector	Healthcare Stocks	488.30%	11.08%	-399.38%
Industry	Drug Manufacturers - General Stocks	50.22%	2.50%	47.29%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	16.75M	11.50%	$2.56B
Primecap management co/ca/	15.80M	10.83%	$1.98B
Blackrock	14.54M	10.01%	$3.37B
Blackrock funding, inc. /de	13.56M	9.29%	$1.70B
State street	7.40M	5.08%	$1.13B
Wellington management group llp	4.93M	3.38%	$754.01M
Point72 asset management	3.83M	2.63%	$481.23M
Geode capital management	3.70M	2.54%	$563.71M
Norges bank	2.33M	1.60%	$355.57M
Invesco	2.13M	1.46%	$325.54M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Palo alto investors lp	205.76K	5.50%	$25.84M
Hillman capital management	41.97K	2.88%	$5.27M
Logos global management lp	200.00K	2.78%	$25.12M
Sphera funds management	82.74K	2.44%	$10.39M
Sector gamma as	50.64K	2.08%	$6.36M
Patient capital management	320.47K	1.82%	$40.25M
Centre asset management	51.53K	1.80%	$7.88M
Primecap management co/ca/	15.80M	1.57%	$1.98B
Provident co of the employees of the hebrew university	12.53K	1.57%	$1.57M
Orion investment	32.90K	1.46%	$4.13M

Top Buyers

Holder	Shares	% Assets	Change
Point72 asset management	3.83M	0.94%	3.42M
Norges bank	2.33M	0.05%	2.33M
D. e. shaw	1.61M	0.18%	1.17M
Ubs group	1.05M	0.03%	544.57K
Brinker capital investments	517.27K	0.24%	509.81K

Top Sellers

Holder	Shares	% Assets	Change
Jpmorgan chase	2.10M	0.02%	-3.16M
Blackrock funding, inc. /de	13.56M	0.03%	-1.66M
T. rowe price investment management	1.39M	0.11%	-1.27M
Ra capital management	-	-	-1.18M
Ameriprise financial	144.02K	0.01%	-1.01M

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	2.33M	0.05%	2.33M	$355.57M
Alyeska investment group	508.77K	0.23%	508.77K	$63.90M
Logos global management lp	200.00K	2.78%	200.00K	$25.12M
Wedge capital management l l p/nc	192.87K	0.46%	192.87K	$27.02M
Cubist systematic strategies	114.94K	0.11%	114.94K	$17.58M

Sold Out

Holder	Change
Brown, lisle/cummings	-1.00
Hm payson	-1.00
Mcclarren financial advisors	-2.00
Financial gravity asset management	-3.00
Tfo-tdc	-3.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Jun 30, 2024	956	-3.34%	127,999,477	0.64%	88	1.15%	407	4.90%	333	-8.01%

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 Q3	-	2
2025 Q2	1	1
2025 Q1	-	1
2024 Q4	-	1
2024 Q3	-	1

BIIB Ownership FAQ

Who Owns Biogen?

Biogen shareholders are primarily institutional investors at 88.87%, followed by 0.15% insiders and 10.98% retail investors. The average institutional ownership in Biogen's industry, Drug Manufacturers - General Stocks, is 50.22%, which Biogen exceeds.

Who owns the most shares of Biogen?

Biogen’s largest shareholders are Vanguard group (16.75M shares, 11.50%), Primecap management co/ca/ (15.8M shares, 10.83%), and Blackrock (14.54M shares, 10.01%). Together, they hold 32.34% 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 5.50% of its assets in 205.76K Biogen shares, valued at 25.84M$.

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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