MYDA Advisors’s Biogen BIIB Stock Holding History

MYDA Advisors’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
2025 Q3	–	Sell	-10,000	Closed	-$1.26M	–	161
2025 Q2	$1.26M	Buy	10,000 +7,000	+233%	+$872K	0.22%	85
2025 Q1	$411K	Sell	3,000 -9,000	-75%	-$1.29M	0.07%	122
2024 Q4	$1.84M	Buy	+12,000	New	+$2.02M	0.46%	55

Other funds holding BIIB

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

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

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 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

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

JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

MYDA Advisors's BIIB Position: Q3 2025 in Review

MYDA Advisors sold out of Biogen (BIIB) in Q3 2025, closing a stake of 10,000 shares — an estimated $1.26M sold.

MYDA Advisors first reported a position in BIIB in Q4 2024 and held it in 3 quarters. The position peaked at $1.84M in Q4 2024. 908 funds tracked by Wall St. Rank hold BIIB as of Q3 2025.

MYDA Advisors reported no remaining Biogen position as of Q3 2025 after selling out during the quarter.
MYDA Advisors sold 10,000 Biogen shares in Q3 2025, an estimated $1.26M.
MYDA Advisors first reported a position in Biogen in Q4 2024 and held it in 3 quarters.
MYDA Advisors's Biogen position peaked at $1.84M in Q4 2024.
908 funds tracked by Wall St. Rank held Biogen as of Q3 2025.

Based on MYDA Advisors's 13F filing for Q3 2025, filed 13 Nov 2025.