Hudson Bay Capital Management
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Hudson Bay Capital Management’s Biogen BIIB Stock Holding History

Hudson Bay Capital 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
2019
Q2 		– Sell
-30,000
Closed -$7.09M – 440
2019
Q1 		$7.09M Buy
30,000
+10,000
+50% +$3.15M 0.09% 217
2018
Q4 		$6.02M Buy
+20,000
New +$6.38M 0.08% 235
2017
Q2 		– Sell
-10,000
Closed -$2.73M – 548
2017
Q1 		$2.73M Sell
10,000
-105,500
-91% -$29.8M 0.04% 395
2016
Q4 		$32.8M Buy
115,500
+27,400
+31% +$8.12M 0.68% 22
2016
Q3 		$27.6M Buy
+88,100
New +$26.1M 0.67% 29

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

Hudson Bay Capital Management's BIIB Position: Q1 2026 in Review

Hudson Bay Capital Management reduced its Biogen (BIIB) stake by 9.2% in Q1 2026, selling an estimated $3.78M and leaving 201,367 shares worth $36.9M. The position accounts for 0.13% of the portfolio, ranked #137.

Hudson Bay Capital Management first reported a position in BIIB in Q3 2016 and has held it in 35 quarters since. The position peaked at $58.2M in Q3 2024. 1,003 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Hudson Bay Capital Management held 201,367 shares of Biogen worth $36.9M as of Q1 2026.
  • Hudson Bay Capital Management sold 20,493 Biogen shares in Q1 2026, an estimated $3.78M.
  • Biogen made up 0.13% of Hudson Bay Capital Management's portfolio in Q1 2026, its #137 holding.
  • Hudson Bay Capital Management first reported a position in Biogen in Q3 2016 and has held it in 35 quarters since.
  • Hudson Bay Capital Management's Biogen position peaked at $58.2M in Q3 2024.
  • 1,003 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Hudson Bay Capital Management's 13F filing for Q1 2026, filed 13 May 2026.