QuantumSi is trading 8.36% up at $0.85 based on the provided live price context, despite biotech weakness; the catalyst remains unclear.
- No new company-specific announcement or filing dated August 21, 2026 was identified.
- The latest listed release was its August 18 conference participation notice, following August 13 earnings and the Proteus launch delay.
- Monitor for delayed filings, partnership news, or unusual trading activity.