Warren Buffett’s Biogen BIIB Stock Holding History

Warren Buffett’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

Other funds holding BIIB

Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

ClearBridge Investments New York $115B AUM 24.78% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Northern Trust Chicago, Illinois $757B AUM 28.64% 1-Year Est. Return

Norges Bank Oslo, Norway $935B AUM

Warren Buffett's BIIB Position: Q2 2021 in Review

Warren Buffett sold out of Biogen (BIIB) in Q2 2021, closing a stake of 643,022 shares — an estimated $180M sold.

Warren Buffett first reported a position in BIIB in Q4 2019 and held it in 6 quarters. The position peaked at $203M in Q1 2020. 1,105 funds tracked by Wall St. Rank hold BIIB as of Q2 2021.

Warren Buffett reported no remaining Biogen position as of Q2 2021 after selling out during the quarter.
Warren Buffett sold 643,022 Biogen shares in Q2 2021, an estimated $180M.
Warren Buffett first reported a position in Biogen in Q4 2019 and held it in 6 quarters.
Warren Buffett's Biogen position peaked at $203M in Q1 2020.
1,105 funds tracked by Wall St. Rank held Biogen as of Q2 2021.

Based on Berkshire Hathaway's 13F filing for Q2 2021, filed 16 Aug 2021.