Biogen Ownership | Who Owns Biogen?

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Biogen Ownership Summary

Biogen is owned by 90.00% institutional investors, 0.18% insiders, and 9.82% retail investors. Vanguard group is the largest institutional shareholder, holding 11.90% of BIIB shares. Vanguard PRIMECAP Inv is the top mutual fund, with 5.66% of its assets in Biogen shares.

BIIB Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Biogen	90.00%	0.18%	9.82%
Sector	Healthcare Stocks	35.58%	11.87%	52.55%
Industry	Drug Manufacturers - General Stocks	45.52%	6.03%	48.45%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	17.45M	11.90%	$3.07B
Blackrock funding, inc. /de	15.97M	10.89%	$2.93B
Primecap management co/ca/	14.76M	10.06%	$2.71B
Blackrock	14.54M	10.01%	$3.37B
Fmr	12.81M	8.73%	$2.35B
State street	7.17M	4.89%	$1.31B
Geode capital management	4.34M	2.96%	$793.39M
Wellington management group llp	2.96M	2.02%	$542.96M
Norges bank	2.64M	1.80%	$464.41M
Morgan stanley	2.17M	1.48%	$398.00M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Palo alto investors lp	140.72K	3.95%	$25.80M
Sector gamma as	90.10K	3.90%	$16.52M
Hillman capital management	29.54K	3.76%	$5.42M
Sphera funds management	92.53K	2.69%	$16.96M
Patient capital management	379.74K	2.55%	$69.62M
Rhenman & partners asset management ab	109.10K	2.47%	$20.00M
Orion investment	39.61K	2.30%	$7.26M
Primecap management co/ca/	14.76M	2.13%	$2.71B
Sivik global healthcare	15.00K	2.09%	$2.75M
Old north state wealth management	24.59K	2.09%	$4.51M

Top Buyers

Holder	Shares	% Assets	Change
Fmr	12.81M	0.12%	3.38M
Norges bank	2.64M	0.05%	2.64M
Blackrock funding, inc. /de	15.97M	0.05%	1.16M
Vanguard fiduciary trust	825.53K	0.04%	825.53K
Aqr capital management	1.92M	0.16%	394.94K

Top Sellers

Holder	Shares	% Assets	Change
Point72 asset management	809.62K	0.19%	-2.00M
Ra capital management	-	-	-1.18M
Pacer advisors	-	-	-1.15M
Millennium management	93.96K	0.01%	-1.03M
Barclays	551.47K	0.02%	-753.53K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	2.64M	0.05%	2.64M	$464.41M
Vanguard fiduciary trust	825.53K	0.04%	825.53K	$151.34M
Vanguard global advisers	343.77K	0.03%	343.77K	$63.02M
Vestal point capital, lp	275.00K	1.74%	275.00K	$38.52M
Vanguard asset management	249.78K	0.04%	249.78K	$45.79M

Sold Out

Holder	Change
Hm payson	-1.00
Brown, lisle/cummings	-1.00
Palisade asset management	-1.00
Valued wealth advisors	-1.00
Quest 10 wealth builders	-1.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Mar 31, 2026	1,021	-2.48%	132,037,182	-5.48%	90	0.99%	515	1.58%	290	-3.33%
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%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard PRIMECAP Inv	8.36M	5.66%	-
Vanguard Total Stock Mkt Idx Inv	4.67M	3.17%	16.76K
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	3.81M	2.58%	67.95K
Fidelity Contrafund	3.27M	2.21%	211.34K
Vanguard Mid Cap Index Institutional	3.18M	2.15%	6.96K
Invesco QQQ Trust	3.02M	2.06%	21.00K
Vanguard Health Care Inv	2.40M	1.63%	-510.99K
Vanguard Capital Opportunity Inv	2.33M	1.58%	-

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 Q2	-	-
2026 Q1	1	2
2025 Q4	-	-
2025 Q3	-	2
2025 Q2	1	1

BIIB Ownership FAQ

Who Owns Biogen?

Biogen shareholders are primarily institutional investors at 90.00%, followed by 0.18% insiders and 9.82% retail investors. The average institutional ownership in Biogen's industry, Drug Manufacturers - General Stocks, is 45.52%, 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 (15.97M shares, 10.89%), and Primecap management co/ca/ (14.76M shares, 10.06%). Together, they hold 32.85% 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 3.95% of its assets in 140.72K Biogen shares, valued at 25.8M$.

Who is the top mutual fund holder of Biogen shares?

Vanguard PRIMECAP Inv is the top mutual fund holder of Biogen shares, with 5.66% of its total shares outstanding invested in 8.36M Biogen shares.

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