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Marex Group’s Biogen BIIB Stock Holding History

Marex Group’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
Q4 		– Sell
-2,525
Closed -$354K – 993
2025
Q3 		$354K Buy
+2,525
New +$341K ﹤0.01% 583
2025
Q2 		– Sell
-3,081
Closed -$422K – 673
2025
Q1 		$422K Sell
3,081
-4,411
-59% -$631K 0.01% 373
2024
Q4 		$1.15M Buy
7,492
+3,625
+94% +$611K 0.02% 224
2024
Q3 		$750K Buy
3,867
+2,568
+198% +$537K 0.02% 240
2024
Q2 		$301K Buy
1,299
+45
+4% +$9.78K 0.01% 413
2024
Q1 		$270K Sell
1,254
-182
-13% -$42.6K 0.01% 341
2023
Q4 		$372K Buy
1,436
+193
+16% +$47.4K 0.01% 355
2023
Q3 		$319K Buy
1,243
+530
+74% +$142K 0.05% 152
2023
Q2 		$203K Sell
713
-439
-38% -$131K 0.04% 200
2023
Q1 		$320K Buy
+1,152
New +$319K 0.04% 194

Other funds holding BIIB

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Point72 Asset Management
Point72 Asset Management Stamford, Connecticut $90.7B AUM 77.13% 1-Year Est. Return
Norges Bank
Norges Bank Oslo, Norway $1T AUM
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

Marex Group's BIIB Position: Q4 2025 in Review

Marex Group sold out of Biogen (BIIB) in Q4 2025, closing a stake of 2,525 shares — an estimated $354K sold.

Marex Group first reported a position in BIIB in Q1 2023 and held it in 10 quarters. The position peaked at $1.15M in Q4 2024. 1,000 funds tracked by Wall St. Rank hold BIIB as of Q4 2025.

  • Marex Group reported no remaining Biogen position as of Q4 2025 after selling out during the quarter.
  • Marex Group sold 2,525 Biogen shares in Q4 2025, an estimated $354K.
  • Marex Group first reported a position in Biogen in Q1 2023 and held it in 10 quarters.
  • Marex Group's Biogen position peaked at $1.15M in Q4 2024.
  • 1,000 funds tracked by Wall St. Rank held Biogen as of Q4 2025.

Based on Marex Group's 13F filing for Q4 2025, filed 12 Feb 2026.