Quantum-Si Inc
Quantum-Si Incorporated (Nasdaq: QSI) is a life sciences company focused on proteomics research with the mission of transforming single-molecule analysis and democratizing access to the proteome. The company develops a proprietary, universal, single-molecule detection platform applied to next-generation protein… From the company’s description.
Margins and return on equity change in ; everything else in percent. Fewer shares and less debt are shown plainly, not as bad news — it depends what you make of buybacks. Dotted labels explain each measure. is shown separately from the annual figures.
What Quantum-Si Inc does
In the company’s own words
Quantum-Si Incorporated (Nasdaq: QSI) is a life sciences company focused on proteomics research with the mission of transforming single-molecule analysis and democratizing access to the proteome. The company develops a proprietary, universal, single-molecule detection platform applied to next-generation protein sequencing (NGPS) that enables researchers and clinicians to sequence proteins in a massively parallel fashion rather than sequentially, providing improved resolution and unbiased access to the proteome at unprecedented speed and scale.
The company's current product portfolio includes the Platinum and Platinum Pro NGPS instruments, library preparation and barcoding kits, sequencing kits, and Platinum Analysis Software, a cloud-based solution that automates data analysis workflows and provides visualization of sequencing results. Platinum was the first-to-market NGPS instrument, priced at approximately $85,000, while Platinum Pro, launched in January 2025, offers enhanced capabilities at approximately $120,000. The company began a controlled launch of Platinum in December 2022, moved to controlled commercial launch in January 2023, and transitioned to full commercial launch in the second quarter of 2024.
Quantum-Si's competitive advantages include differentiated single-molecule, kinetic detection technology providing amino acid-level resolution; automated, user-friendly data analysis through its proprietary software; a business model leveraging a growing installed base with recurring consumable revenue; and robust patent protection with 402 issued patents and 348 pending applications as of December 31, 2025. The company maintains a direct sales force in the United States, combined direct and distributor approach in Europe, and distributor relationships across key global markets.
The company's strategic roadmap includes development of Proteus, its next-generation platform anticipated to launch by the end of 2026, designed to provide single-molecule amino acid-level resolution with significantly higher sequencing output, increased sample throughput, workflow automation, and automated data analysis. Quantum-Si was incorporated in Delaware in 2020 as HighCape Capital Acquisition Corp. and completed a business combination with Q-SI Operations Inc. in June 2021, which was founded in 2013. The company's management team brings decades of cumulative experience in healthcare and life sciences, including previous success launching disruptive technologies in genomics and sequencing markets.
Company details
- Sector
- Healthcare
- Industry
- Medical Instruments
- Headquarters
- BRANFORD, CT
- Fiscal year end
- December
- CIK
- 1816431
- SIC
- 3829
Financial performance, year by year
Fiscal 2021–2025 · USDThe full income statement, balance sheet and cash flow for each of these years — every figure traceable to its filing — is on the Financials tab with a free account.
Who owns Quantum-Si Inc — and what changed
Funds as of 2026Q2 · superinvestors as of 2026-06-30
Largest fund holders · Quantum-Si Inc’s weight in each
Fund ownership is a floor, not a census — pensions, insurers and people holding shares directly are not visible here.
Fund ownership counts N-PORT filers only, so it is a floor rather than a census — pensions, insurers and direct holders are not visible here, and the remainder is not “held by individuals”.
Could not be determined for this company: bond issues.
Every fund and institutional holder, quarter by quarter, is on the Ownership tab with a free account.
Recent filings
All filings →Each filing opens into its own statements and disclosures here.
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