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, 2026	147,700,000
Mar 31, 2026	147,200,000
Dec 31, 2025	146,700,000
Sep 30, 2025	146,600,000
Jun 30, 2025	145,900,000
Mar 31, 2025	145,900,000
Dec 31, 2024	145,700,000
Sep 30, 2024	145,700,000
Jun 30, 2024	145,600,000
Mar 31, 2024	145,200,000
Dec 31, 2023	144,900,000
Sep 30, 2023	144,800,000
Jun 30, 2023	144,700,000
Mar 31, 2023	144,400,000
Dec 31, 2022	144,100,000
Sep 30, 2022	144,400,000
Jun 30, 2022	145,900,000
Mar 31, 2022	147,100,000
Dec 31, 2021	146,900,000
Sep 30, 2021	148,000,000
Jun 30, 2021	149,700,000
Mar 31, 2021	151,900,000
Dec 31, 2020	153,700,000
Sep 30, 2020	156,900,000
Jun 30, 2020	160,600,000
Mar 31, 2020	172,800,000
Dec 31, 2019	177,800,000
Sep 30, 2019	184,000,000
Jun 30, 2019	190,300,000
Mar 31, 2019	196,600,000
Dec 31, 2018	199,800,000
Sep 30, 2018	201,400,000
Jun 30, 2018	207,100,000
Mar 31, 2018	211,400,000
Dec 31, 2017	211,500,000
Sep 30, 2017	211,400,000
Jun 30, 2017	211,900,000
Mar 31, 2017	215,600,000
Dec 31, 2016	216,600,000
Sep 30, 2016	218,900,000
Jun 30, 2016	219,100,000
Mar 31, 2016	218,900,000
Dec 31, 2015	220,400,000
Sep 30, 2015	232,200,000
Jun 30, 2015	235,300,000
Mar 31, 2015	234,995,000
Dec 31, 2014	235,481,000
Sep 30, 2014	236,217,000
Jun 30, 2014	236,661,000
Mar 31, 2014	236,786,000
Dec 31, 2013	236,283,000
Sep 30, 2013	237,070,000
Jun 30, 2013	237,484,000
Mar 31, 2013	236,837,000
Dec 31, 2012	236,612,000
Sep 30, 2012	236,474,000
Jun 30, 2012	238,988,000
Mar 31, 2012	239,754,000
Dec 31, 2011	242,959,000
Sep 30, 2011	242,883,000
Jun 30, 2011	242,375,000
Mar 31, 2011	241,536,000
Dec 31, 2010	241,536,000
Sep 30, 2010	239,864,000
Jun 30, 2010	259,938,000
Mar 31, 2010	269,922,000
Dec 31, 2009	269,922,000
Sep 30, 2009	288,917,000
Jun 30, 2009	288,615,000
Mar 31, 2009	287,703,000
Dec 31, 2008	287,703,000
Sep 30, 2008	291,408,000
Jun 30, 2008	290,356,000
Mar 31, 2008	296,171,000
Dec 31, 2007	296,171,000
Sep 30, 2007	288,958,000
Jun 30, 2007	340,315,000
Mar 31, 2007	340,310,000
Dec 31, 2006	340,310,000
Sep 30, 2006	338,021,000
Jun 30, 2006	342,375,000
Mar 31, 2006	339,653,000
Dec 31, 2005	339,653,000
Sep 30, 2005	336,536,000
Jun 30, 2005	332,629,000
Mar 31, 2005	335,279,000
Dec 31, 2004	335,279,000
Sep 30, 2004	334,777,000
Jun 30, 2004	337,018,000
Mar 31, 2004	333,699,000
Dec 31, 2003	333,699,000
Sep 30, 2003	389,964,000
Jun 30, 2003	389,964,000
Mar 31, 2003	389,964,000
Dec 31, 2002	389,964,000
Sep 30, 2002	389,964,000
Jun 30, 2002	389,964,000
Mar 31, 2002	389,964,000
Dec 31, 2001	389,964,000
Sep 30, 2001	389,964,000