BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

BERKSHIRE ASSET MANAGEMENT LLC/PA's Holding History (CIK: 0000949012)

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

Q3 2025

Shares 1,541 Value ($000) $216 Avg Close $135.17 Range $121.05 - $150.28

Q4 2024

Shares 1,568 Value ($000) $229 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 2,029 Value ($000) $470 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 2,029 Value ($000) $470 Avg Close $217.32 Range $189.44 - $237.54

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2025	1,541	$216	$135.17	$121.05 - $150.28
Q4 2024	1,568	$229	$168.67	$145.07 - $195.00
Q3 2024	2,029	$470	$209.21	$188.78 - $238.00
Q2 2024	2,029	$470	$217.32	$189.44 - $237.54