QuantumSi is trading 10.36% up at $0.85, supported mainly by broader biotech-sector strength rather than a newly reported company-specific catalyst.
- Biotech ETF XBI is up 2.06% during the regular session, while major U.S. indices are modestly higher.
- QuantumSi’s latest significant update was its August 13 earnings release, which included a Proteus launch delay to Q2 2027 and workforce reductions, making it unlikely to explain the August 25 advance.