
Quantum-Si fell 13.3% from $1.58 to $1.37, behind the S&P 500's +9.8%. Its worst day was Jun 5 (−18.0%), and its low came Jul 29 at $0.70.
Nov 11, 2025 – Nov 9, 2026 · picked from earnings, analyst actions, headlines and the biggest daily moves
EPS of $-0.08 beat the $-0.13 estimate on $451,000.00 revenue (est. $809,200.00); FY revenue guidance of $1.0M against the $5.4M consensus.
−4.0% · S&P 500 +0.7%
Quantum-Si shares rose 24.9%, while the S&P 500 rose 0.8%.
Story events cover the past 12 months · Times ET
+24.9% · S&P 500 +0.8%
EPS of $-0.10 beat the $-0.10 estimate on $258,000.00 revenue (est. $319,200.00); FY revenue guidance of $1.0M against the $1.0M consensus.
−7.5% · S&P 500 +0.8%
Quantum-Si shares fell 18.0%, while the S&P 500 fell 2.6%.
−18.0%, the year's worst day · S&P 500 −2.6%
Quantum-Si closed at its lowest level of the year, 55.6% below where the year started.
−7.7% · S&P 500 −1.5%
EPS of $-0.11 beat the $-0.11 estimate on $344,000.00 revenue (est. $307,600.00); FY revenue guidance of $1.0M against the $1.0M consensus.
−6.4% · S&P 500 −0.2%
Quantum-Si shares rose 33.6%, while the S&P 500 rose 0.2%.
+33.6%, the year's best day · S&P 500 +0.2%
Quantum-Si Incorporated (NASDAQ:QSI) ("Quantum-Si," "QSI" or the "Company"), a proteomics company redefining protein analysis through single-molecule protein sequencing, today announced that it
+25.4%, on 41M shares, the year's heaviest volume · S&P 500 +0.6%
Quantum-Si closed at its highest level of the year, 10.8% above where the year started.
+1.7% · S&P 500 −0.4%
EPS of $-0.10 beat the $-0.12 estimate on $212,000.00 revenue (est. $274,664.00); FY revenue guidance of $1.0M against the $1.1M consensus.
+13.7% · S&P 500 +0.3%
Where it ended: a close of $1.37 on Nov 9, 2026. Up next: Q4 2026 earnings on Mar 2, 2027 (EPS est. $-0.11, revenue est. $233,864.00).
Nothing in the past 12 months.
All QSI dividend historyReplay the year: the line draws itself and stops at each of the 10 moments with what happened and how the stock reacted.
Chart by ChartIQ. Events, ratings, quote and fundamentals from Benzinga APIs. Daily bars for QSI and SPY from Benzinga historical bars. Not investment advice.