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Atom Investors’s Biogen BIIB Stock Holding History

Atom Investors’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
2021
Q3 		– Sell
-15,900
Closed -$5.51M – 316
2021
Q2 		$5.51M Buy
+15,900
New +$4.82M 0.69% 25

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

Atom Investors's BIIB Position: Q1 2026 in Review

Atom Investors increased its Biogen (BIIB) stake by 14% in Q1 2026, buying an estimated $558K and bringing the position to 24,749 shares worth $4.54M. The position accounts for 0.32% of the portfolio, ranked #92.

Atom Investors first reported a position in BIIB in Q1 2019 and has held it in 13 quarters since. The position peaked at $11.1M in Q3 2019. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Atom Investors held 24,749 shares of Biogen worth $4.54M as of Q1 2026.
  • Atom Investors bought 3,029 Biogen shares in Q1 2026, an estimated $558K.
  • Biogen made up 0.32% of Atom Investors's portfolio in Q1 2026, its #92 holding.
  • Atom Investors first reported a position in Biogen in Q1 2019 and has held it in 13 quarters since.
  • Atom Investors's Biogen position peaked at $11.1M in Q3 2019.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Atom Investors's 13F filing for Q1 2026, filed 15 May 2026.