BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

BlackRock, Inc.'s Holding History (CIK: 0002012383)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 14,811,370 Value ($000) $2,606,653 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 14,763,952 Value ($000) $2,068,134 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 13,555,466 Value ($000) $1,702,431 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 15,211,036 Value ($000) $2,081,478 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 15,473,710 Value ($000) $2,366,240 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 15,347,041 Value ($000) $2,974,870 Avg Close $209.21 Range $188.78 - $238.00

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	14,811,370	$2,606,653	$163.37	$138.00 - $185.17
Q3 2025	14,763,952	$2,068,134	$135.17	$121.05 - $150.28
Q2 2025	13,555,466	$1,702,431	$124.60	$110.04 - $137.32
Q1 2025	15,211,036	$2,081,478	$142.96	$128.51 - $157.09
Q4 2024	15,473,710	$2,366,240	$168.67	$145.07 - $195.00
Q3 2024	15,347,041	$2,974,870	$209.21	$188.78 - $238.00