Earnings per Share

6 Months Ended

Jun. 30, 2026


Note 14:			Earnings per Share

Basic and diluted shares outstanding used in our earnings per share calculation are calculated as follows:


	For the Three Months Ended June 30,				For the Six Months Ended June 30,
(In millions)	2026		2025		2026		2025
Numerator:
Net income attributable to Biogen Inc.	$	97.5	$	634.8	$	417.0	$	875.3
Denominator:
Weighted average number of common shares outstanding	147.7		146.5		147.4		146.3
Effect of dilutive securities:

Time-vested restricted stock units	0.8		0.2		1.0		0.3

Performance stock units settled in stock	0.2		—		0.2		0.1
Dilutive potential common shares	1.0		0.2		1.2		0.4
Shares used in calculating diluted earnings per share	148.7		146.7		148.6		146.7

Amounts excluded from the calculation of net income per diluted share because their effects were anti-dilutive were insignificant.