Quantum-Si incorporated (QSI)
NasdaqGM
Price as at 1 Oct 2026, 00:00 UTC. Quotes are delayed.
Fundamentals
Valuation and ratings
Quantum-Si incorporated trades at $1.07. We do not hold enough of the inputs to value this company with the confidence the estimate implies, so we publish no fair value for it rather than a number we would not defend.
About Quantum-Si incorporated
Quantum-Si incorporated, a life sciences company, develops proprietary, universal, and single-molecule detection platform applied to proteomics to enable next-gen protein sequencing (NGPS). The company offers Platinum and Platinum Pro NGPS instruments for single-molecule, amino acid level resolution, and automated data analysis; library preparation kits to prepare a customer's protein sample for sequencing; and sequencing kits, which contain the reagents and consumables used to perform NGPS. It also provides Platinum analysis software, a cloud-based solution that automates data analysis workflows and visualizes the sequencing results. The company was founded in 2013 and is headquartered in Branford, Connecticut.
Company profile, industry and headcount are as reported by our data provider and can lag a company's own filings by a reporting period. The annual report is the authority.
Super investor ownership
6 of the funds we track reported a position in their latest SEC 13F filing. Largest first:
- Cathie Wood, ARK Investment Management LLC$6.34M · 0.0% of book
- Israel Englander, MILLENNIUM MANAGEMENT LLC$2.77M · 0.0% of book
- Cliff Asness, AQR CAPITAL MANAGEMENT LLC$2.08M · 0.0% of book
- Renaissance Technologies, RENAISSANCE TECHNOLOGIES LLC$490.2K · 0.0% of book
- Ken Griffin, CITADEL ADVISORS LLC$39.2K · 0.0% of book
A word of warning on reading these figures: a 13F reports the market value of a holding, so a fund that traded nothing at all still appears to have sold when the price fell. We found 102 companies where the standard reading gives the opposite answer. Only the share count is honest.
Common questions
Which funds own QSI?
6 of the institutions we track reported a position in QSI in their most recent SEC 13F filing. A 13F is filed up to 45 days after quarter end, so it tells you what a fund held then, not what it holds now.
Where does SteadyShares get its QSI data?
Fundamentals for QSI come from company filings and exchange data, as listed on NasdaqGM; institutional ownership comes from SEC 13F filings. The share price shown was last refreshed on 1 Oct 2026, 00:00 UTC and is delayed. Metrics we do not hold are left out of the page rather than estimated.
The full research page for QSI, with financial statements, ownership detail, peer comparison and alerts, is free inside the app.
Data from company filings, exchange quotes and SEC EDGAR 13F disclosures. Quotes are delayed. Metrics we do not have are left out rather than estimated. Educational information, not financial advice.