Quantum-Si Incorporated Class A Common Stock. Replay the stock market charts of QSI day by day, back to 2003. Open long and short positions without spending any money. Quantum-Si incorporated, a life sciences company, develops a single molecule detection platform for sample preparation and sequencing. It offers a proprietary single molecule detection platform for use in semiconductor industry to field proteomics to enable next generation protein sequencing. The company was incorporated in 2013 is based in Guilford, Connecticut.
