---
title: "Quantum-Si incorporated (QSI.US) — Company Overview"
type: "Symbol"
locale: "en"
url: "https://longbridge.com/en/quote/QSI.US/overview.md"
symbol: "QSI.US"
name: "Quantum-Si incorporated"
parent: "https://longbridge.com/en/quote/QSI.US.md"
datetime: "2026-04-05T05:52:41.366Z"
locales:
  - [en](https://longbridge.com/en/quote/QSI.US/overview.md)
  - [zh-CN](https://longbridge.com/zh-CN/quote/QSI.US/overview.md)
  - [zh-HK](https://longbridge.com/zh-HK/quote/QSI.US/overview.md)
---

> Supported Languages: [简体中文](https://longbridge.com/zh-CN/quote/QSI.US/overview.md) | [繁體中文](https://longbridge.com/zh-HK/quote/QSI.US/overview.md)


# Quantum-Si incorporated (QSI.US) — Company Overview

## Basic Information

| Item | Detail |
|------|--------|
| Industry | Life Sciences Tools and Services |
| Exchange | US Market |
| Address | 29 Business Park Drive, Branford, Connecticut, United States |
| Website | [www.quantum-si.com](https://www.quantum-si.com) |

## Company Profile

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.

## Key Executives

| Name | Title |
|------|-------|
| Jeffrey Alan Hawkins | President, CEO & Director |
| Charles R. Kummeth | Independent Chairman |
| Jonathan M. Rothberg | Founder & Executive Director |
| Jeffry R. Keyes | CFO & Treasurer |
| Todd Rearick | Chief Technology Officer |
| Christian Lapointe | General Counsel & Corporate Secretary |
| Ruth Ann Fattori | Independent Director |
| Scott Edward Mendel | Independent Director |

## Major Shareholders

| Name | Ratio | Report Date |
|------|-------|-------------|
| Jonathan M. Rothberg | 15.55% | 2025-10-16 |
| BlackRock, Inc. | 6.03% | 2025-12-31 |
| The Vanguard Group, Inc. | 4.44% | 2025-12-31 |
| ARK Investment Management LLC | 3.25% | 2025-12-31 |
| Nikko Asset Management Co., Ltd. | 2.17% | 2025-12-31 |
| Geode Capital Management, LLC | 1.90% | 2025-12-31 |
| State Street Global Advisors, Inc. | 1.65% | 2025-12-31 |
| Citadel Advisors LLC | 1.24% | 2025-12-31 |
| Susquehanna International Group, LLP | 1.08% | 2025-12-31 |
| Northern Trust Global Investments | 1.02% | 2025-12-31 |

## Business Breakdown

| Segment | Revenue | Ratio |
|---------|---------|-------|
| Biotechnology (Startups) | 2436000 | 100% |

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## Geographic Segments

| Region | Revenue | Ratio |
|--------|---------|-------|
| International | 1737000 | 71.31% |
| United States | 699000 | 28.69% |


---

> **Disclaimer: This article is for reference only and does not constitute any investment advice.**