Sphera Funds Management’s Biogen BIIB Stock Holding History

Sphera Funds 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	$21.6M	Buy	+100,000	New	+$19.1M	2.82%	6
2021 Q4	–	Sell	-50,000	Closed	-$14.1M	–	99
2021 Q3	$14.1M	Hold	50,000	–	–	1.19%	19
2021 Q2	$17.3M	Buy	+50,000	New	+$15.1M	1.17%	25
2017 Q3	–	Sell	-500	Closed	-$14.5M	–	134
2017 Q2	$14.5M	Buy	+500	New	+$132K	2.46%	9

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

Sphera Funds Management's BIIB Position: Q2 2026 in Review

Sphera Funds Management increased its Biogen (BIIB) stake by 4.4% in Q2 2026, buying an estimated $784K and bringing the position to 96,626 shares worth $20.9M. The position accounts for 2.72% of the portfolio, ranked #7.

Sphera Funds Management first reported a position in BIIB in Q4 2013 and has held it in 37 quarters since. The position peaked at $37.9M in Q4 2015. 1,045 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

Sphera Funds Management held 96,626 shares of Biogen worth $20.9M as of Q2 2026.
Sphera Funds Management bought 4,100 Biogen shares in Q2 2026, an estimated $784K.
Biogen made up 2.72% of Sphera Funds Management's portfolio in Q2 2026, its #7 holding.
Sphera Funds Management first reported a position in Biogen in Q4 2013 and has held it in 37 quarters since.
Sphera Funds Management's Biogen position peaked at $37.9M in Q4 2015.
1,045 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

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