Logos Global Management’s Biogen BIIB Stock Holding History

Logos Global Management’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	–	Sell	-200,000	Closed	-$36.7M	–	71
2026 Q1	$36.7M	Hold	200,000	–	–	1.83%	17
2025 Q4	$35.2M	Buy	200,000 +100,000	+100%	+$16.3M	2.13%	15
2025 Q3	$14M	Sell	100,000 -100,000	-50%	-$13.5M	1.26%	30
2025 Q2	$25.1M	Buy	+200,000	New	+$24.9M	2.78%	10
2023 Q3	–	Sell	-100,000	Closed	-$28.5M	–	60
2023 Q2	$28.5M	Hold	100,000	–	–	3.87%	8
2023 Q1	$27.8M	Buy	+100,000	New	+$27.7M	3.98%	8

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

Logos Global Management's BIIB Position: Q2 2026 in Review

Logos Global Management sold out of Biogen (BIIB) in Q2 2026, closing a stake of 200,000 shares — an estimated $36.7M sold.

Logos Global Management first reported a position in BIIB in Q1 2023 and held it in 6 quarters. The position peaked at $36.7M in Q1 2026. 1,041 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

Logos Global Management reported no remaining Biogen position as of Q2 2026 after selling out during the quarter.
Logos Global Management sold 200,000 Biogen shares in Q2 2026, an estimated $36.7M.
Logos Global Management first reported a position in Biogen in Q1 2023 and held it in 6 quarters.
Logos Global Management's Biogen position peaked at $36.7M in Q1 2026.
1,041 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

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