QuantumSi is trading at $1.33, down 6.88%, with biotech-sector weakness a possible contributor.

  • No October 2 company announcement was identified to explain the pre-market decline.
  • Recent Proteus results were positive, but were announced earlier and do not clearly explain the move.
  • The biotech-sector ETF was down 2.01% pre-market amid negative company-specific news across the industry; this context offers a possible explanation, not confirmation of the direct cause.