BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

SOUTHEASTERN ASSET MANAGEMENT INC/TN/'s Holding History (CIK: 0000807985)

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

Q1 2022

Shares 842,962 Value ($000) $177,528 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 858,523 Value ($000) $205,977 Avg Close $257.12 Range $221.72 - $290.76

Q1 2021

Shares 603,890 Value ($000) $168,939 Avg Close $269.69 Range $238.40 - $296.38

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2022	842,962	$177,528	$217.46	$192.67 - $249.00
Q4 2021	858,523	$205,977	$257.12	$221.72 - $290.76
Q1 2021	603,890	$168,939	$269.69	$238.40 - $296.38