BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

SIERRA OCEAN, LLC's Holding History (CIK: 0002051715)

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

Q2 2025

Shares 8 Value ($000) $1 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 39 Value ($000) $5 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 20 Value ($000) $3 Avg Close $168.67 Range $145.07 - $195.00

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2025	8	$1	$124.60	$110.04 - $137.32
Q1 2025	39	$5	$142.96	$128.51 - $157.09
Q4 2024	20	$3	$168.67	$145.07 - $195.00