BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

First County Bank /CT/'s Holding History (CIK: 0001983616)

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

Q4 2025

Shares 4,412 Value ($000) $776 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 4,477 Value ($000) $627 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 4,477 Value ($000) $562 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 4,772 Value ($000) $653 Avg Close $142.96 Range $128.51 - $157.09

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	4,412	$776	$163.37	$138.00 - $185.17
Q3 2025	4,477	$627	$135.17	$121.05 - $150.28
Q2 2025	4,477	$562	$124.60	$110.04 - $137.32
Q1 2025	4,772	$653	$142.96	$128.51 - $157.09