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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
Q2 		$64.7M Buy
758,952
+145,000
+24% +$10.4M 1.31% 27
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

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
State Street
State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
ACA
Avoro Capital Advisors New York $11.1B AUM 207.82% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Siren LLC's CYTK Position: Q2 2026 in Review

Siren LLC increased its Cytokinetics (CYTK) stake by 24% in Q2 2026, buying an estimated $10.4M and bringing the position to 758,952 shares worth $64.7M. The position accounts for 1.31% of the portfolio, ranked #27.

Siren LLC first reported a position in CYTK in Q3 2024 and has held it in 4 quarters since. 484 funds tracked by Wall St. Rank hold CYTK as of Q2 2026.

  • Siren LLC held 758,952 shares of Cytokinetics worth $64.7M as of Q2 2026.
  • Siren LLC bought 145,000 Cytokinetics shares in Q2 2026, an estimated $10.4M.
  • Cytokinetics made up 1.31% of Siren LLC's portfolio in Q2 2026, its #27 holding.
  • Siren LLC first reported a position in Cytokinetics in Q3 2024 and has held it in 4 quarters since.
  • 484 funds tracked by Wall St. Rank held Cytokinetics as of Q2 2026.

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