BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

BERKSHIRE HATHAWAY INC's Holding History (CIK: 0001067983)

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

Q1 2021

Shares 643,022 Value ($000) $179,885 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 643,022 Value ($000) $157,450 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 643,022 Value ($000) $182,412 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 643,022 Value ($000) $172,041 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 643,022 Value ($000) $203,440 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 648,447 Value ($000) $192,414 Avg Close $277.46 Range $219.70 - $318.00

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2021	643,022	$179,885	$269.69	$238.40 - $296.38
Q4 2020	643,022	$157,450	$259.08	$223.25 - $363.92
Q3 2020	643,022	$182,412	$278.91	$261.87 - $312.00
Q2 2020	643,022	$172,041	$300.59	$257.60 - $350.24
Q1 2020	643,022	$203,440	$303.47	$262.25 - $374.99
Q4 2019	648,447	$192,414	$277.46	$219.70 - $318.00