BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Weiss Asset Management LP's Holding History (CIK: 0001357550)

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

Q4 2025

Shares 55,560 Value ($000) $9,778 Avg Close $163.37 Range $138.00 - $185.17

Q1 2024

Shares 1,554 Value ($000) $335 Avg Close $234.20 Range $211.02 - $268.30

Q2 2021

Shares 5,612 Value ($000) $1,943 Avg Close $302.94 Range $257.03 - $468.55

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	55,560	$9,778	$163.37	$138.00 - $185.17
Q1 2024	1,554	$335	$234.20	$211.02 - $268.30
Q2 2021	5,612	$1,943	$302.94	$257.03 - $468.55