Biogen Ownership | Who Owns Biogen?

Overview Forecast RevenueFinancials Chart Transcripts

Biogen Ownership Summary

Biogen is owned by 86.71% institutional investors, 0.22% insiders, and 13.07% 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	86.71%	0.22%	13.07%
Sector	Healthcare Stocks	279.42%	10.64%	-190.05%
Industry	Drug Manufacturers - General Stocks	37.59%	1.26%	61.15%

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
Pacer advisors	2.67M	1.83%	$407.92M
Norges bank	2.33M	1.60%	$355.57M

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
Pacer advisors	2.67M	0.88%	2.65M
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

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
Cubist systematic strategies	114.94K	0.11%	114.94K	$17.58M
Freestone grove partners lp	111.00K	0.11%	111.00K	$13.94M

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 %
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%
Mar 31, 2024	989	-4.54%	127,188,969	-0.41%	87	1.13%	388	-8.06%	362	-1.90%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard PRIMECAP Inv	9.00M	6.14%	-5.46K
Vanguard Total Stock Mkt Idx Inv	4.72M	3.22%	16.78K
Vanguard US Total Market Shares ETF	4.62M	3.16%	3.46K
Vanguard Health Care Inv	4.37M	2.98%	-
Vanguard Institutional 500 Index Trust	4.16M	2.84%	30.48K
Vanguard 500 Index Investor	4.16M	2.84%	-5.50K
Vanguard Mid Cap Index Institutional	3.23M	2.21%	20.26K
Invesco QQQ Trust	3.01M	2.05%	-1.89K
Vanguard Capital Opportunity Inv	2.40M	1.64%	57.38K
Fidelity 500 Index	1.86M	1.27%	9.99K

Recent Insider Transactions

Date	Name	Role	Activity	Value
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
Dec 09, 2024	Singhal Priya	Head of Development	Sell	$17.29K

Insider Transactions Trends

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

BIIB Ownership FAQ

Who Owns Biogen?

Biogen shareholders are primarily institutional investors at 86.71%, followed by 0.22% insiders and 13.07% retail investors. The average institutional ownership in Biogen's industry, Drug Manufacturers - General Stocks, is 37.59%, 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.

Try Tickergate Pro Free

Customize Everything. 100% Flexibility. Fast and Easy to Use (No code or Excel Needed)

Customize your own personal stocks lists, views and charts
Choose from hundreds of fields, up to 15 years of history
Conduct deep comparison analysis

Discover trending investment themes
Find your next best investment
Research stocks using tools