Biogen Ownership | Who Owns Biogen?

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Biogen Ownership Summary

Biogen is owned by 97.31% institutional investors, 0.19% insiders, and 2.50% retail investors. Fmr is the largest institutional shareholder, holding 12.38% 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	97.31%	0.19%	2.50%
Sector	Healthcare Stocks	50.51%	12.37%	37.12%
Industry	Drug Manufacturers - General Stocks	51.73%	3.54%	44.73%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Fmr	18.22M	12.38%	$3.94B
Vanguard group	17.45M	11.90%	$3.07B
Blackrock funding, inc. /de	15.99M	10.86%	$3.45B
Primecap management co/ca/	15.15M	10.30%	$3.27B
Blackrock	14.54M	10.01%	$3.37B
Vanguard capital management	9.65M	6.56%	$2.09B
State street	7.34M	4.99%	$1.59B
Geode capital management	4.45M	3.02%	$957.94M
Wellington management group llp	3.12M	2.12%	$673.56M
Norges bank	2.58M	1.75%	$557.44M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Palo alto investors lp	140.28K	4.19%	$30.31M
Hillman capital management	23.99K	3.75%	$5.18M
Healthinvest partners ab	62.78K	3.65%	$13.56M
Sphera funds management	96.63K	2.72%	$20.88M
Sector gamma as	54.16K	2.54%	$11.70M
Orion investment	39.57K	2.49%	$8.55M
Old north state wealth management	24.72K	2.28%	$5.34M
Sivik global healthcare	15.00K	2.09%	$2.75M
Patient capital management	283.70K	2.01%	$61.30M
Primecap management co/ca/	15.15M	1.94%	$3.27B

Top Buyers

Holder	Shares	% Assets	Change
Fmr	18.22M	0.17%	5.41M
Norges bank	2.58M	0.06%	2.58M
Sixth street partners management company	1.12M	0.03%	1.12M
Amundi	1.52M	0.08%	726.00K
Ubs group	1.03M	0.03%	506.70K

Top Sellers

Holder	Shares	% Assets	Change
Ra capital management	-	-	-1.18M
T. rowe price investment management	113.87K	0.02%	-1.05M
Van eck associates	98.11K	0.01%	-981.75K
Point72 asset management	88.15K	0.02%	-721.47K
Two sigma advisers, lp	13.50K	0.00%	-442.00K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	2.58M	0.06%	2.58M	$557.44M
Sixth street partners management company	1.12M	0.03%	1.12M	$241.48M
Vestal point capital, lp	275.00K	1.74%	275.00K	$38.52M
Lord, abbett	130.18K	0.08%	130.18K	$28.13M
Axa investment managers	118.31K	0.04%	118.31K	$16.57M

Sold Out

Holder	Change
Brown, lisle/cummings	-1.00
Hm payson	-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 %
Jun 30, 2026	1,083	2.46%	143,236,996	6.12%	97	1.15%	544	1.68%	294	-
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%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard PRIMECAP Inv	8.36M	5.66%	-
Fidelity Contrafund	4.99M	3.38%	913.88K
Vanguard MStar Total Stk Mkt Idx Invest	4.70M	3.18%	13.85K
Vanguard Total Stock Mkt Idx Inv	4.69M	3.18%	16.70K
Vanguard Morn Total Stk Mkt Idx Investor	4.69M	3.17%	16.70K
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	3.88M	2.62%	40.33K
Vanguard Mid Cap Index Institutional	3.20M	2.17%	15.51K
Vanguard Morn Mid Cap Index Instl	3.20M	2.17%	15.51K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 03, 2026	Minor Lloyd	-	Sell	$120.58K
Aug 04, 2026	Minor Lloyd	-	Sell	$119.17K
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

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	-	2
2026 Q2	-	-
2026 Q1	1	2
2025 Q4	-	-
2025 Q3	-	2

BIIB Ownership FAQ

Who Owns Biogen?

Biogen shareholders are primarily institutional investors at 97.31%, followed by 0.19% insiders and 2.50% retail investors. The average institutional ownership in Biogen's industry, Drug Manufacturers - General Stocks, is 51.73%, which Biogen exceeds.

Who owns the most shares of Biogen?

Biogen’s largest shareholders are Fmr (18.22M shares, 12.38%), Vanguard group (17.45M shares, 11.90%), and Blackrock funding, inc. /de (15.99M shares, 10.86%). Together, they hold 35.14% 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 4.19% of its assets in 140.28K Biogen shares, valued at 30.31M$.

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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