QuantumSi is trading 5.14% lower at $1.66 after-hours, with no clear company-specific catalyst identified and the cause uncertain.

  • Shares closed the regular session at $1.75 on October 29.
  • No clear company-specific announcement explaining the decline surfaced in available coverage. QuantumSi’s next business update and third-quarter results are scheduled for November 5, not October 29.
  • The Nasdaq fell 2.32%, which may have added pressure, but no source directly links the broader selloff to QuantumSi’s move.