Holocene Advisors
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Holocene Advisors’s Biogen BIIB Stock Holding History

Holocene Advisors’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
2020
Q3 		– Sell
-345,000
Closed -$92.3M – 679
2020
Q2 		$92.3M Buy
+345,000
New +$104M 0.81% 40

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

Holocene Advisors's BIIB Position: Q1 2026 in Review

Holocene Advisors opened a new position in Biogen (BIIB) in Q1 2026: 4,793 shares worth $879K. The stake represents ﹤0.01% of the portfolio and ranks #690 among its holdings. This is a return to the name: Holocene Advisors previously reported a position in BIIB as recently as Q3 2025.

Holocene Advisors first reported a position in BIIB in Q1 2018 and has held it in 8 quarters since. The position peaked at $74.2M in Q4 2019. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Holocene Advisors held 4,793 shares of Biogen worth $879K as of Q1 2026.
  • Biogen was a new Holocene Advisors position in Q1 2026.
  • Biogen made up ﹤0.01% of Holocene Advisors's portfolio in Q1 2026, its #690 holding.
  • Holocene Advisors first reported a position in Biogen in Q1 2018 and has held it in 8 quarters since.
  • Holocene Advisors's Biogen position peaked at $74.2M in Q4 2019.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Holocene Advisors's 13F filing for Q1 2026, filed 15 May 2026.