Quantum-Si is a life sciences tools company focused on next-generation protein sequencing (NGPS). The company's core product is the Platinum/Platinum Pro benchtop instrument, which sequences proteins at the single-molecule, amino acid level, enabling researchers to identify proteins, measure their abundance, and detect post-translational modifications. Quantum-Si sells to academic institutions, biopharma companies, government labs, and CROs. The company follows the classic razor/blade model used across life sciences tools: instruments are sold (or placed via lease/rental) to build an installed base, and customers then purchase consumable kits — library preparation, sequencing, and barcoding kits — for every sequencing run. Consumables are expected to become the primary recurring revenue engine over time. Instruments are priced at ~$85K for Platinum and ~$120K for Platinum Pro, well below the $1M+ cost of incumbent mass spectrometry systems, which is a core commercial differentiator. Quantum-Si sells directly in the U.S. and through a network of 23+ international distributors elsewhere, with roughly 65% of the installed base outside the U.S. The company's next major product, Proteus, is expected to launch by end of 2026, featuring a substantially higher-density chip and automated workflow, which Quantum-Si believes could allow any lab to run advanced proteomics without large core lab infrastructure. Quantum-Si is pre-profitability and in early commercialization, funded by a balance sheet that held ~$230M as of September 2025.