Berkshire Hathaway
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Berkshire Hathaway’s Biogen BIIB Stock Holding History

Berkshire Hathaway’s Portfolio BIIB Stock Details BIIB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2021
Q2 		– Sell
-643,022
Closed -$180M – 46
2021
Q1 		$180M Hold
643,022
– – 0.07% 36
2020
Q4 		$157M Hold
643,022
– – 0.06% 39
2020
Q3 		$182M Hold
643,022
– – 0.08% 41
2020
Q2 		$172M Hold
643,022
– – 0.09% 35
2020
Q1 		$203M Sell
643,022
-5,425
-0.8% -$1.65M 0.12% 40
2019
Q4 		$192M Buy
+648,447
New +$180M 0.08% 41

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