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Siren LLC’s Cytokinetics CYTK Stock Holding History

Siren LLC’s Portfolio CYTK Stock Details CYTK Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$40.5M Buy
+613,952
New +$39M 1.12% 25
2025
Q1 		– Sell
-402,323
Closed -$18.9M – 120
2024
Q4 		$18.9M Sell
402,323
-123,648
-24% -$6.42M 0.84% 34
2024
Q3 		$27.8M Buy
+525,971
New +$29.3M 1.39% 26

Other funds holding CYTK

T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
ACA
Avoro Capital Advisors New York $10.2B AUM 149.19% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return

Siren LLC's CYTK Position: Q1 2026 in Review

Siren LLC opened a new position in Cytokinetics (CYTK) in Q1 2026: 613,952 shares worth $40.5M. The stake represents 1.12% of the portfolio and ranks #25 among its holdings. This is a return to the name: Siren LLC previously reported a position in CYTK as recently as Q4 2024.

Siren LLC first reported a position in CYTK in Q3 2024 and has held it in 3 quarters since. 439 funds tracked by Wall St. Rank hold CYTK as of Q1 2026.

  • Siren LLC held 613,952 shares of Cytokinetics worth $40.5M as of Q1 2026.
  • Cytokinetics was a new Siren LLC position in Q1 2026.
  • Cytokinetics made up 1.12% of Siren LLC's portfolio in Q1 2026, its #25 holding.
  • Siren LLC first reported a position in Cytokinetics in Q3 2024 and has held it in 3 quarters since.
  • 439 funds tracked by Wall St. Rank held Cytokinetics as of Q1 2026.

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