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Polymer Capital Management’s Biogen BIIB Stock Holding History

Polymer 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
2026
Q1 		– Sell
-5,022
Closed -$884K – 832
2025
Q4 		$884K Buy
5,022
+2,348
+88% +$384K 0.09% 324
2025
Q3 		$375K Sell
2,674
-1,086
-29% -$147K 0.04% 505
2025
Q2 		$472K Sell
3,760
-120
-3% -$15K 0.06% 268
2025
Q1 		$531K Buy
+3,880
New +$555K 0.14% 152

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

Polymer Capital Management's BIIB Position: Q1 2026 in Review

Polymer Capital Management sold out of Biogen (BIIB) in Q1 2026, closing a stake of 5,022 shares — an estimated $884K sold.

Polymer Capital Management first reported a position in BIIB in Q1 2025 and held it in 4 quarters. The position peaked at $884K in Q4 2025. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Polymer Capital Management reported no remaining Biogen position as of Q1 2026 after selling out during the quarter.
  • Polymer Capital Management sold 5,022 Biogen shares in Q1 2026, an estimated $884K.
  • Polymer Capital Management first reported a position in Biogen in Q1 2025 and held it in 4 quarters.
  • Polymer Capital Management's Biogen position peaked at $884K in Q4 2025.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Polymer Capital Management's 13F filing for Q1 2026, filed 14 May 2026.