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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
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 $2.12B AUM 143.53% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
SCM
Suvretta Capital Management New York $3.92B AUM 86.67% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
WP
Woodline Partners San Francisco, California $26.4B AUM 44.85% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Siren LLC's RCUS Position: Q1 2026 in Review

Siren LLC held its Arcus Biosciences (RCUS) position steady in Q1 2026 at 3,007,077 shares worth $65M. The position accounts for 1.8% of the portfolio, ranked #17.

Siren LLC first reported a position in RCUS in Q3 2024 and has held it in 7 quarters since. The position peaked at $71.7M in Q4 2025. 210 funds tracked by Wall St. Rank hold RCUS as of Q1 2026.

  • Siren LLC held 3,007,077 shares of Arcus Biosciences worth $65M as of Q1 2026.
  • Siren LLC left its Arcus Biosciences share count unchanged in Q1 2026.
  • Arcus Biosciences made up 1.8% of Siren LLC's portfolio in Q1 2026, its #17 holding.
  • Siren LLC first reported a position in Arcus Biosciences in Q3 2024 and has held it in 7 quarters since.
  • Siren LLC's Arcus Biosciences position peaked at $71.7M in Q4 2025.
  • 210 funds tracked by Wall St. Rank held Arcus Biosciences as of Q1 2026.

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