William Blair Investment Management
CYTK icon

William Blair Investment Management’s Cytokinetics CYTK Stock Holding History

William Blair Investment Management’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 		$137M Buy
1,603,442
+515,851
+47% +$37M 0.41% 75
2026
Q1 		$71.7M Buy
+1,087,591
New +$69.1M 0.24% 115

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 $3.37T AUM 44.26% 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

William Blair Investment Management's CYTK Position: Q2 2026 in Review

William Blair Investment Management increased its Cytokinetics (CYTK) stake by 47% in Q2 2026, buying an estimated $37M and bringing the position to 1,603,442 shares worth $137M. The position accounts for 0.41% of the portfolio, ranked #75.

William Blair Investment Management first reported a position in CYTK in Q1 2026 and has held it in 2 quarters since. 482 funds tracked by Wall St. Rank hold CYTK as of Q2 2026.

  • William Blair Investment Management held 1,603,442 shares of Cytokinetics worth $137M as of Q2 2026.
  • William Blair Investment Management bought 515,851 Cytokinetics shares in Q2 2026, an estimated $37M.
  • Cytokinetics made up 0.41% of William Blair Investment Management's portfolio in Q2 2026, its #75 holding.
  • William Blair Investment Management first reported a position in Cytokinetics in Q1 2026 and has held it in 2 quarters since.
  • 482 funds tracked by Wall St. Rank held Cytokinetics as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.