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Siren LLC’s Arcus Biosciences RCUS Stock Holding History

Siren LLC’s Portfolio RCUS Stock Details RCUS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$74.6M Sell
2,420,430
-586,647
-20% -$14.5M 1.51% 20
2026
Q1 		$65M Hold
3,007,077
– – 1.8% 17
2025
Q4 		$71.7M Buy
3,007,077
+95,000
+3% +$1.94M 2.14% 13
2025
Q3 		$39.6M Buy
2,912,077
+1,300,000
+81% +$13.5M 1.55% 22
2025
Q2 		$13.1M Hold
1,612,077
– – 0.68% 35
2025
Q1 		$12.7M Hold
1,612,077
– – 0.71% 33
2024
Q4 		$24M Hold
1,612,077
– – 1.06% 28
2024
Q3 		$24.6M Buy
+1,612,077
New +$25.4M 1.23% 28

Other funds holding RCUS

GS
Gilead Sciences Foster City, California $1.65B AUM 166.99% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
SCM
Suvretta Capital Management New York $5.47B AUM 131.34% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Citadel Advisors
Citadel Advisors Miami, Florida $875B AUM 40.89% 1-Year Est. Return
WP
Woodline Partners San Francisco, California $32.4B AUM 58.5% 1-Year Est. Return

Siren LLC's RCUS Position: Q2 2026 in Review

Siren LLC reduced its Arcus Biosciences (RCUS) stake by 20% in Q2 2026, selling an estimated $14.5M and leaving 2,420,430 shares worth $74.6M. The position accounts for 1.51% of the portfolio, ranked #20.

Siren LLC first reported a position in RCUS in Q3 2024 and has held it in 8 quarters since. 231 funds tracked by Wall St. Rank hold RCUS as of Q2 2026.

  • Siren LLC held 2,420,430 shares of Arcus Biosciences worth $74.6M as of Q2 2026.
  • Siren LLC sold 586,647 Arcus Biosciences shares in Q2 2026, an estimated $14.5M.
  • Arcus Biosciences made up 1.51% of Siren LLC's portfolio in Q2 2026, its #20 holding.
  • Siren LLC first reported a position in Arcus Biosciences in Q3 2024 and has held it in 8 quarters since.
  • 231 funds tracked by Wall St. Rank held Arcus Biosciences as of Q2 2026.

Based on Siren LLC's 13F filing for Q2 2026, filed 13 Aug 2026.