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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
2026
Q1 		– Sell
-19,000
Closed -$3.34M – 159
2025
Q4 		$3.34M Buy
+19,000
New +$3.1M 0.64% 36
2025
Q3 		– Sell
-30,000
Closed -$3.77M – 160
2025
Q2 		$3.77M Sell
30,000
-29,000
-49% -$3.61M 0.66% 47
2025
Q1 		$8.07M Buy
59,000
+39,000
+195% +$5.58M 1.4% 19
2024
Q4 		$3.06M Buy
+20,000
New +$3.37M 0.77% 39

Other funds holding BIIB

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 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. 905 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.
  • 905 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.