Biogen Inc. BIIB

Set alert

254.87 USD +6.52 (+2.63%)

At closeNov 9, 2026, 4:20 PM EST

254.87 0.00 0.00%

After hours · Nov 9, 4:20 PM ET

246.44 Day range 261.00

153.77 52-week range 261.00

Held by insiders 0.19%

Held by institutions 100.07%

Float held by institutions 100.26%

Institutions 1,513

Top institutional holders
Holder	% held	Shares	Value	Reported
FMR, LLC	12.32%	18,217,239	4.64B	Jun 29, 2026
Blackrock Inc.	10.81%	15,985,736	4.07B	Jun 29, 2026
Primecap Management Company	10.25%	15,154,606	3.86B	Jun 29, 2026
Vanguard Capital Management LLC	6.53%	9,651,117	2.46B	Jun 29, 2026
State Street Corporation	4.97%	7,344,327	1.87B	Jun 29, 2026
Vanguard Portfolio Management LLC	4.47%	6,604,936	1.68B	Jun 29, 2026

Top mutual fund holders
Holder	% held	Shares	Value	Reported
VANGUARD CHESTER FUNDS-Vanguard PRIMECAP Fund	5.66%	8,359,880	2.13B	Jun 29, 2026
Fidelity Contrafund	3.54%	5,227,192	1.33B	Sep 29, 2026
VANGUARD INDEX FUNDS-Vanguard Total Stock Market Index Fund	3.17%	4,687,985	1.19B	Jun 29, 2026
VANGUARD INDEX FUNDS-Vanguard 500 Index Fund	2.59%	3,827,862	975.61M	Jun 29, 2026
VANGUARD INDEX FUNDS-Vanguard Mid-Cap Index Fund	2.16%	3,199,078	815.35M	Jun 29, 2026
VANGUARD SPECIALIZED FUNDS-Vanguard Health Care Fund	1.86%	2,745,486	699.74M	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

Ownership