QuantumSi is trading 15.14% down at $1.47 on October 30, 2026, with the broad technology selloff the clearest available explanation; no company-specific catalyst was identified. - Reuters reported the Nasdaq fell 2.26% at the open as Amazon’s AI spending plans and Intel’s cash-burn warning heightened concerns about AI infrastructure costs and returns. - QuantumSi’s investor-relations page lists its next business update and third-quarter results for November 5. - Supplied price context shows a sharp reversal after several consecutive gains.