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iSAM Funds (UK)’s Biogen BIIB Stock Holding History

iSAM Funds (UK)’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 		$535K Buy
+2,916
New +$537K 0.26% 128
2025
Q4 		– Sell
-17,191
Closed -$2.41M – 358
2025
Q3 		$2.41M Buy
17,191
+12,666
+280% +$1.71M 0.49% 50
2025
Q2 		$568K Buy
+4,525
New +$564K 0.12% 243
2024
Q4 		– Sell
-5,756
Closed -$1.12M – 260
2024
Q3 		$1.12M Buy
+5,756
New +$1.2M 0.63% 42
2024
Q2 		– Sell
-1,389
Closed -$300K – 239
2024
Q1 		$300K Buy
+1,389
New +$325K 0.17% 176
2023
Q3 		– Sell
-3,402
Closed -$969K – 233
2023
Q2 		$969K Buy
+3,402
New +$1.01M 0.87% 28

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

iSAM Funds (UK)'s BIIB Position: Q1 2026 in Review

iSAM Funds (UK) opened a new position in Biogen (BIIB) in Q1 2026: 2,916 shares worth $535K. The stake represents 0.26% of the portfolio and ranks #128 among its holdings. This is a return to the name: iSAM Funds (UK) previously reported a position in BIIB as recently as Q3 2025.

iSAM Funds (UK) first reported a position in BIIB in Q2 2023 and has held it in 6 quarters since. The position peaked at $2.41M in Q3 2025. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • iSAM Funds (UK) held 2,916 shares of Biogen worth $535K as of Q1 2026.
  • Biogen was a new iSAM Funds (UK) position in Q1 2026.
  • Biogen made up 0.26% of iSAM Funds (UK)'s portfolio in Q1 2026, its #128 holding.
  • iSAM Funds (UK) first reported a position in Biogen in Q2 2023 and has held it in 6 quarters since.
  • iSAM Funds (UK)'s Biogen position peaked at $2.41M in Q3 2025.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on iSAM Funds (UK)'s 13F filing for Q1 2026, filed 13 May 2026.