Horizon Quantum Holdings is trading 5.59% down at $16.43 after overnight risk-off sentiment and rising long-term Treasury yields pressured growth-oriented technology and quantum stocks.

  • No fresh company-specific announcement was identified for August 21, 2026.
  • Shares gained 3.45% to $17.40 on August 20; broader pre-market indexes were modestly higher after their prior-session sell-off.