Biogen Ownership | Who Owns Biogen?

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Biogen Ownership Summary

Biogen is owned by 89.86% institutional investors, 0.31% insiders, and 9.83% retail investors. Vanguard group is the largest institutional shareholder, holding 11.50% of BIIB shares. Vanguard PRIMECAP Inv is the top mutual fund, with 6.24% of its assets in Biogen shares.

BIIB Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Biogen	89.86%	0.31%	9.83%
Sector	Healthcare Stocks	57.39%	9.93%	32.68%
Industry	Drug Manufacturers - General Stocks	45.98%	1.80%	52.22%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	16.75M	11.50%	$2.56B
Primecap management co/ca/	16.05M	11.01%	$2.45B
Blackrock funding, inc. /de	15.47M	10.62%	$2.37B
Blackrock	14.54M	10.01%	$3.37B
State street	7.40M	5.08%	$1.13B
Wellington management group llp	4.93M	3.38%	$754.01M
Geode capital management	3.70M	2.54%	$563.71M
T. rowe price investment management	3.10M	2.13%	$474.02M
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
Krensavage asset management	123.78K	13.18%	$28.70M
Palo alto investors lp	190.15K	4.51%	$29.08M
Patient capital management	413.96K	2.92%	$63.30M
Hillman capital management	43.07K	2.44%	$6.59M
Rhenman & partners asset management ab	123.70K	1.94%	$18.92M
Orion investment	31.72K	1.94%	$4.85M
Primecap management co/ca/	16.05M	1.90%	$2.45B
Stoneridge investment partners	33.80K	1.85%	$5.17M
Centre asset management	51.53K	1.80%	$7.88M
Provident co of the employees of the hebrew university	9.06K	1.61%	$1.38M

Top Buyers

Holder	Shares	% Assets	Change
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
Van eck associates	1.07M	0.21%	967.52K
Qube research	1.09M	0.22%	741.50K

Top Sellers

Holder	Shares	% Assets	Change
Jpmorgan chase	2.10M	0.02%	-3.16M
Ra capital management	-	-	-1.18M
T. rowe price investment management	3.10M	0.29%	-1.16M
Ameriprise financial	144.02K	0.01%	-1.01M
Clearbridge investments	1.58K	0.00%	-600.40K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	2.33M	0.05%	2.33M	$355.57M
Causeway capital management	281.70K	0.98%	281.70K	$43.08M
Voloridge investment management	151.68K	0.08%	151.68K	$23.19M
Raymond james financial	141.97K	0.01%	141.97K	$21.71M
Cubist systematic strategies	114.94K	0.11%	114.94K	$17.58M

Sold Out

Holder	Change
Hm payson	-1.00
Mcclarren financial advisors	-2.00
Tfo-tdc	-3.00
Financial gravity asset management	-3.00
Piscataqua savings bank	-3.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Dec 31, 2023	1,036	3.39%	127,711,696	4.26%	88	1.23%	422	1.69%	369	7.58%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard PRIMECAP Inv	9.10M	6.24%	-84.08K
Vanguard Health Care Inv	4.61M	3.16%	49.90K
Vanguard US Total Market Shares ETF	4.62M	3.16%	3.46K
Vanguard Total Stock Mkt Idx Inv	4.58M	3.13%	6.69K
Vanguard Institutional 500 Index Trust	4.04M	2.76%	24.43K
Vanguard Mid Cap Index Institutional	3.15M	2.15%	13.22K
Invesco QQQ Trust	3.01M	2.06%	-2.62K
Vanguard Capital Opportunity Inv	2.35M	1.62%	4.83K
Fidelity 500 Index	1.83M	1.25%	8.13K
SPDR® S&P 500 ETF	1.81M	1.24%	-26.66K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Mar 07, 2025	SHERWIN STEPHEN A	-	Sell	$1.31M
Dec 09, 2024	Singhal Priya	Head of Development	Sell	$17.29K
Sep 03, 2024	Singhal Priya	Head of Development	Sell	$88.02K
Apr 02, 2024	Singhal Priya	Head of Development	Sell	$19.82K
Feb 22, 2024	Singhal Priya	Head of Development	Sell	$57.96K

Insider Transactions Trends

Date	Buy	Sell
2025 Q2	-	-
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 89.86%, followed by 0.31% insiders and 9.83% retail investors. The average institutional ownership in Biogen's industry, Drug Manufacturers - General Stocks, is 45.98%, 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/ (16.05M shares, 11.01%), and Blackrock funding, inc. /de (15.47M shares, 10.62%). Together, they hold 33.13% 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?

Krensavage asset management is Biogen’s biggest shareholder by percentage of total assets invested, with 13.18% of its assets in 123.78K Biogen shares, valued at 28.7M$.

Who is the top mutual fund holder of Biogen shares?

Vanguard PRIMECAP Inv is the top mutual fund holder of Biogen shares, with 6.24% of its total shares outstanding invested in 9.1M Biogen shares.

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