Steven Cohen’s Biogen BIIB Stock Holding History

Steven Cohen’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
2026 Q2	$64.8K	Sell	300 -4,400	-94%	-$842K	﹤0.01%	3761
2026 Q1	$862K	Sell	4,700 -996,800	-100%	-$184M	﹤0.01%	2852
2025 Q4	$176M	Buy	1,001,500 +1,500	+0.2%	+$245K	0.2%	72
2025 Q3	$140M	Buy	1,000,000 +750,000	+300%	+$101M	0.23%	76
2025 Q2	$31.4M	Buy	+250,000	New	+$31.2M	0.06%	353
2022 Q1	–	Sell	-10,000	Closed	-$2.4M	–	1178
2021 Q4	$2.4M	Buy	+10,000	New	+$2.57M	0.01%	793
2020 Q2	–	Sell	-69,600	Closed	-$22M	–	812
2020 Q1	$22M	Buy	+69,600	New	+$21.1M	0.18%	163

Other funds holding BIIB

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

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

Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

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

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return

Norges Bank Oslo, Norway $1T AUM

Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

Steven Cohen's BIIB Position: Q2 2026 in Review

Steven Cohen reduced its Biogen (BIIB) stake by 89% in Q2 2026, selling an estimated $138M and leaving 88,149 shares worth $19M. The position accounts for 0.02% of the portfolio, ranked #920.

Steven Cohen first reported a position in BIIB in Q2 2014 and has held it in 35 quarters since. The position peaked at $543M in Q3 2025. 1,036 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

Steven Cohen held 88,149 shares of Biogen worth $19M as of Q2 2026.
Steven Cohen sold 721,468 Biogen shares in Q2 2026, an estimated $138M.
Biogen made up 0.02% of Steven Cohen's portfolio in Q2 2026, its #920 holding.
Steven Cohen first reported a position in Biogen in Q2 2014 and has held it in 35 quarters since.
Steven Cohen's Biogen position peaked at $543M in Q3 2025.
1,036 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Point72 Asset Management's 13F filing for Q2 2026, filed 14 Aug 2026.