Biogen Inc. BIIB

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248.35 USD +4.42 (+1.81%)

At closeNov 6, 2026, 4:08 PM EST

248.35 0.00 0.00%

After hours · Nov 6, 4:08 PM ET

240.00 Day range 250.03

151.83 52-week range 258.78

Held by insiders 0.19%

Held by institutions 100.20%

Float held by institutions 100.39%

Institutions 1,515

Top institutional holders
Holder	% held	Shares	Value	Reported
FMR, LLC	12.32%	18,217,239	4.53B	Jun 29, 2026
Blackrock Inc.	10.81%	15,985,736	3.97B	Jun 29, 2026
Primecap Management Company	10.25%	15,154,606	3.76B	Jun 29, 2026
Vanguard Capital Management LLC	6.53%	9,651,117	2.40B	Jun 29, 2026
State Street Corporation	4.97%	7,344,327	1.82B	Jun 29, 2026
Vanguard Portfolio Management LLC	4.47%	6,604,936	1.64B	Jun 29, 2026

Top mutual fund holders
Holder	% held	Shares	Value	Reported
VANGUARD CHESTER FUNDS-Vanguard PRIMECAP Fund	5.66%	8,359,880	2.08B	Jun 29, 2026
Fidelity Contrafund	3.54%	5,227,192	1.30B	Sep 29, 2026
VANGUARD INDEX FUNDS-Vanguard Total Stock Market Index Fund	3.17%	4,687,985	1.16B	Jun 29, 2026
VANGUARD INDEX FUNDS-Vanguard 500 Index Fund	2.59%	3,827,862	950.88M	Jun 29, 2026
VANGUARD INDEX FUNDS-Vanguard Mid-Cap Index Fund	2.16%	3,199,078	794.68M	Jun 29, 2026
VANGUARD SPECIALIZED FUNDS-Vanguard Health Care Fund	1.86%	2,745,486	682.01M	Jul 30, 2026

BIIB insiders
Insider	Relation	Latest transaction	Date	Shares held
ALEXANDER SUSAN H	Officer	Conversion of Exercise of derivative security	Feb 5, 2026	61,889
DORSA CAROLINE D	Director	Stock Award(Grant)	Jun 16, 2025	31,002
GREGORY GINGER	Officer	Conversion of Exercise of derivative security	Feb 5, 2026	22,358
KRAMER ROBIN C.	Chief Financial Officer	Conversion of Exercise of derivative security	Feb 5, 2026	11,471
MANTAS JESUS B	Director	Stock Award(Grant)	Jun 8, 2026	11,263
MCDONNELL MICHAEL R	Chief Financial Officer	Conversion of Exercise of derivative security	Feb 9, 2025	24,341

Held by funds