QSI QuantumSi Inc
Company Analysis
Latest News
🔴 QuantumSi is trading 12.2% down today amid biotech and broader-market weakness
QuantumSi is trading 12.2% down at $1.15 on October 16, 2026, amid broader selling pressure, with no clear company-specific negative catalyst identified. -...
🔴 QuantumSi falls 5.7% — Biotech Sector Declines Amid Broad Market Rotation
With Biotech (XBI) down 2.1%, this looks like a sector-led move rather than a company-specific surprise. The biotechnology sector, as represented by the XBI...
🔴 QuantumSi is trading 10.4% down today as hotter-than-expected inflation revives Federal Reserve rate-hike concerns
QuantumSi is trading at $1.25, with a change of -10.43%, as hotter-than-expected inflation revived concerns about further Federal Reserve rate hikes,...
🔴 QuantumSi is trading 5% down on October 15, 2026, as rate concerns pressure tech shares
QuantumSi is trading at $1.33, down 5.04%, amid broader market pressure on technology shares. - The Nasdaq is down 0.86%; inflation and interest-rate concerns...
🟢 QuantumSi is trading 5% up with no specific catalyst established
QuantumSi is trading at $1.43, up +5.15%, with no specific catalyst established. - No clear company-specific announcement explaining the October 13 move was...
🔴 QuantumSi is trading 10.46% down on October 12 — with no clear catalyst identified
QuantumSi is trading 10.46% down at $1.37 on October 12, with no clear company-specific announcement identified to explain the decline. - The latest reported...
🔴 QuantumSi is trading 8.17% down
QuantumSi is trading at $1.41, down 8.17% at 9:38 a.m. EST on October 12, 2026; no clear company-specific announcement or event explaining the decline was...
🟢 QuantumSi is trading 12.35% up
QuantumSi is trading at $1.37, up 12.35% on October 9, 2026; available reports do not directly attribute the move to a catalyst. - On October 8, Quantum-Si...
Quantum-Si Announces Detection of 19 Amino Acids in Proteus™ Development Program
Quantum-Si Incorporated (QSI) announced a key milestone in its Proteus™ single-molecule protein sequencing platform, having successfully demonstrated the...
🔴 QuantumSi is trading 5.5% down amid biotech-sector weakness
QuantumSi is trading 5.5% lower at $1.21 on October 8, 2026, with biotech-sector weakness possibly contributing. - XBI is down 2.04% in the session; major U.S....
🟢 QuantumSi is trading 6.15% up with no confirmed catalyst
QuantumSi is trading at $1.29, up 6.15% on October 7, 2026, with no confirmed reason identified for the move. - The latest listed Quantum-Si press release is...
🔴 QuantumSi is trading 5% down today amid broad risk-off pressure
QuantumSi is trading 5.33% lower at $1.16 on October 7 amid broader market weakness; no company-specific catalyst was confirmed. - The S&P 500 is down 0.61%...
🔴 QuantumSi is trading 6.6% down today amid biotech-sector pressure
QuantumSi is trading at $1.20, with a -6.64% change, amid biotech-sector pressure; available evidence does not establish the exact cause. - No October 6...
🟢 QuantumSi is trading 5% up
QuantumSi is trading at $1.34, up 5.08%, with no clearly reported company-specific catalyst identified for October 6, 2026. - No fresh company announcement was...
🔴 QuantumSi is trading 10.65% down
QuantumSi is trading 10.65% lower at $1.39, with no clear company-specific announcement identified to explain the October 5 decline. - The latest prominent...
🔴 QuantumSi is trading 8.1% down
QuantumSi is trading 8.06% down at $1.43 on October 5, 2026, with no clear company-specific announcement or fresh catalyst identified. - Its latest prominent...
🔴 QuantumSi is trading 11% down in pre-market with no clear catalyst identified
QuantumSi is trading at $1.38, down 10.95% in pre-market; the decline’s cause remains unclear. - No clear company-specific announcement or fresh catalyst was...
🔴 QuantumSi is trading 5.72% down in pre-market with no clear fresh catalyst identified
QuantumSi is trading at $1.46, down 5.72% in pre-market on October 5, after a four-session run-up; the cause of the decline remains unclear. - Shares rose...
🟢 QuantumSi is trading 6.6% up
On October 2, 2026, QuantumSi is trading 6.64% up at $1.52, with no clear company-specific catalyst identified. - The company’s latest listed announcement was...
🔴 QuantumSi is trading 12.94% down as the catalyst remains unclear
QuantumSi is trading at $1.25, down -12.94%, with the specific cause of the decline unclear. - No company announcement or clear catalyst explaining the...