# Quantum-Si (QSI) — Overview

QSI · NASDAQ · Stock

Canonical page: https://www.lighthorse.io/tickers/qsi

## Price

Last close $1.31 on Oct 15, 2026. 52-week range $0.70 – $2.63.

## Company profile

Quantum-Si Inc is a life sciences company focused on proteomics research and analytical technologies. It develops single-molecule detection platforms designed to enable next-generation protein sequencing (NGPS) and large-scale protein analysis. Its technology supports massively parallel sequencing of proteins and can also be applied to the study of nucleic acids, providing tools for researchers and clinical applications in molecular analysis. The company's revenue is derived from sales of products and services.

## Frequently Asked Questions

### How do I buy stock in Quantum-Si (QSI)?

QSI trades commission-free with a Light Horse Securities brokerage account — from the mobile app, the web at [Light Horse Dashboard](https://portal.lighthorse.io), the trading API, or an [AI agent connected over MCP](/instructions/ai/claude). The trade panel on this page places the order once you are signed in.

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Data provided by [AInvest](https://www.ainvest.com).