BIIB tangible book value per share history

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

Biogen Tangible Book Value Per Share — Annual fiscal periods
Period ending	Tangible Book Value Per Share
Dec 31, 2025	17.636
Dec 31, 2024	3.7467
Dec 31, 2023	1.501
Dec 31, 2022	39.8438
Dec 31, 2021	19.9685
Dec 31, 2020	11.4338
Dec 31, 2019	21.667
Dec 31, 2018	20.5232
Dec 31, 2017	19.2192
Dec 31, 2016	21.2958
Dec 31, 2015	11.3827
Dec 31, 2014	21.2612
Dec 31, 2013	12.2965
Dec 31, 2012	17.3615
Dec 31, 2011	15.1508
Dec 31, 2010	10.0287
Dec 31, 2009	11.3176
Dec 31, 2008	8.5738
Dec 31, 2007	6.0302
Dec 31, 2006	9.5922
Dec 31, 2005	8.3432
Dec 31, 2004	7.1119
Dec 31, 2003	6.7829
Dec 31, 2002	4.0502
Dec 31, 2001	3.4164
Dec 31, 2000	2.4492
Dec 31, 1999	2.147
Dec 31, 1998	0.7945
Dec 31, 1997	0.5939
Dec 31, 1996	0.5575
Dec 31, 1995	0.5319
Dec 31, 1994	0.3944
Dec 31, 1993	0.4253
Dec 31, 1992	0.3393
Dec 31, 1991	0.3433
Dec 31, 1990	0.2581
Dec 31, 1989	0.3454
Dec 31, 1988	0.2675
Dec 31, 1987	0.1237
Dec 31, 1986	0.1834
Dec 31, 1985	0.1645