PEAK6
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PEAK6’s Biogen BIIB Stock Holding History

PEAK6’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 		$5.16M Buy
+28,166
New +$5.19M 0.01% 885
2025
Q3 		– Sell
-17,286
Closed -$2.34M – 2941
2025
Q2 		$2.17M Sell
17,286
-13,336
-44% -$1.66M ﹤0.01% 1383
2025
Q1 		$4.19M Buy
30,622
+21,871
+250% +$3.13M 0.01% 1029
2024
Q4 		$1.34M Buy
+8,751
New +$1.48M ﹤0.01% 1649

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

PEAK6's BIIB Position: Q1 2026 in Review

PEAK6 opened a new position in Biogen (BIIB) in Q1 2026: 28,166 shares worth $5.16M. The stake represents 0.01% of the portfolio and ranks #885 among its holdings. This is a return to the name: PEAK6 previously reported a position in BIIB as recently as Q2 2025.

PEAK6 first reported a position in BIIB in Q4 2024 and has held it in 4 quarters since. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • PEAK6 held 28,166 shares of Biogen worth $5.16M as of Q1 2026.
  • Biogen was a new PEAK6 position in Q1 2026.
  • Biogen made up 0.01% of PEAK6's portfolio in Q1 2026, its #885 holding.
  • PEAK6 first reported a position in Biogen in Q4 2024 and has held it in 4 quarters since.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on PEAK6's 13F filing for Q1 2026, filed 14 May 2026.