Shares Out (Basic)

147.70M

Quarterly · Period ending: Jun 30, 2026

BIIB Shares Out (Basic)

Latest reported147.70Mperiod endingJun 30, 2026

BIIB Quarterly Shares Out (Basic) (411.43M → 147.70M)

Quarterly shares out (basic)

High-resolution chart · PNG

BIIB shares out (basic) history

Quarterly. Dates are reporting period ends; fiscal years can differ from calendar years.

Biogen Shares Out (Basic) — Quarterly
Period ending	Shares Out (Basic)
Jun 30, 2001	389,964,000
Mar 31, 2001	389,964,000
Dec 31, 2000	445,226,000
Sep 30, 2000	444,222,000
Jun 30, 2000	445,929,000
Mar 31, 2000	451,080,000
Dec 31, 1999	451,080,000
Sep 30, 1999	907,317,000
Jun 30, 1999	897,931,000
Mar 31, 1999	884,516,000
Dec 31, 1998	884,516,000
Sep 30, 1998	867,692,000
Jun 30, 1998	897,143,000
Mar 31, 1998	877,895,000
Dec 31, 1997	877,895,000
Sep 30, 1997	878,571,000
Jun 30, 1997	852,857,000
Mar 31, 1997	850,000,000
Dec 31, 1996	850,000,000
Sep 30, 1996	845,625,000
Jun 30, 1996	780,000,000
Mar 31, 1996	740,000,000
Dec 31, 1995	740,000,000
Sep 30, 1995	660,000,000
Jun 30, 1995	750,000,000
Mar 31, 1995	840,000,000
Dec 31, 1994	840,000,000
Sep 30, 1994	792,000,000
Jun 30, 1994	816,000,000
Mar 31, 1994	840,000,000
Dec 31, 1993	840,000,000
Sep 30, 1993	753,333,000
Jun 30, 1993	672,000,000
Mar 31, 1993	847,500,000
Dec 31, 1992	847,500,000
Sep 30, 1992	740,000,000
Jun 30, 1992	420,000,000
Mar 31, 1992	480,000,000
Dec 31, 1991	480,000,000
Sep 30, 1991	600,000,000
Jun 30, 1991	660,000,000
Mar 31, 1991	420,000,000
Dec 31, 1990	420,000,000
Sep 30, 1990	390,000,000
Jun 30, 1990	390,000,000
Mar 31, 1990	390,000,000
Dec 31, 1989	390,000,000
Sep 30, 1989	390,000,000
Jun 30, 1989	390,000,000
Mar 31, 1989	240,000,000
Dec 31, 1988	240,000,000
Sep 30, 1988	240,000,000
Jun 30, 1988	540,000,000
Mar 31, 1988	540,000,000
Dec 31, 1987	515,245,000
Sep 30, 1987	525,000,000
Jun 30, 1987	495,000,000
Mar 31, 1987	480,000,000
Dec 31, 1986	480,000,000
Sep 30, 1986	450,000,000
Jun 30, 1986	446,667,000
Mar 31, 1986	420,000,000
Dec 31, 1985	420,000,000
Sep 30, 1985	411,429,000