Skip to main content
Recent Quotes
My Watchlist
Indicators
Markets
Stocks
ETFs
Tools
Markets:
Overview
News
Currencies
International
Treasuries

Quantum-Si Incorporated - Class A Common Stock (NQ:QSI)

0.7700 +0.0399 (+5.47%)
Streaming Delayed Price Updated: 4:00 PM EDT, Sep 17, 2026 Add to My Watchlist
Quote
Overview Detailed Quote Charting Historical Prices
News
All News News Headlines Press Releases
Research
Quarterly Reports Insider Filings Other Filings

Price and Volume

Detailed Quote
Volume 2,825,715
Open 0.7495
Bid (Size) 0.7696 (1,000)
Ask (Size) 0.7842 (200)
Prev. Close 0.7301
Today's Range 0.7495 - 0.7963
52wk Range 0.6900 - 3.100
Shares Outstanding N/A
Dividend Yield N/A
Chart for (: )
Intraday 1 Week 1 Month 3 Month 1 Year 3 Year 5 Year

Top News

More News
News headline image
Quantum-Si Announces Detection of 18 Amino Acids Using a Developmental Sequencing Kit on Proteus™
Milestone continues the progress towards detection of all 20 amino acids by end of 2026 
From Quantum-Si Incorporated
Via GlobeNewswire
News headline image
Quantum-Si Expands Proteus™ Roadshow with Additional U.S. and European Cities
Growing Multi-City Program Continues to Increase Awareness of Proteus and Support Customer Funnel Development Ahead of Commercial Launch 
From Quantum-Si Incorporated
Via GlobeNewswire

Performance

YTD
-33.6%
-33.6%
1 Month
+3.5%
+3.5%
3 Month
-18.5%
-18.5%
6 Month
-12.7%
-12.7%
1 Year
-42.1%
-42.1%

More News

Read More
News headline image
Quantum-Si (QSI) Q2 2026 Earnings Call Transcript ↗
Via The Motley Fool
Topics Earnings
Quantum-Si (QSI) Reports Q1 2026 Revenue Miss but Beats EPS Amid Proteus Launch Preparations ↗
Via Chartmill
News headline image
Quantum-Si to Participate in the H.C. Wainwright 28th Annual Global Investment Conference
From Quantum-Si Incorporated
Via GlobeNewswire
News headline image
Quantum-Si Q2 Earnings Call Highlights ↗
Via MarketBeat
Topics Earnings
News headline image
Full Transcript: Quantum-Si Q2 2026 Earnings Call ↗
Via Benzinga
Topics Earnings
News headline image
Quantum-Si Reports Second Quarter 2026 Financial Results and Provides Proteus™ Development Update
From Quantum-Si Incorporated
Via GlobeNewswire
News headline image
Quantum-Si to Report Second Quarter 2026 Financial Results on August 13, 2026
From Quantum-Si Incorporated
Via GlobeNewswire
News headline image
Quantum-Si Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)
From Quantum-Si Incorporated
Via Business Wire
News headline image
Quantum-Si and Cell Signaling Technology Partner to Advance Post-Translational Modification Analysis on Proteus™
From Quantum-Si Incorporated
Via Business Wire
News headline image
Quantum-Si Announces the Expansion of the Proteus™ Roadshow
From Quantum-Si Incorporated
Via Business Wire
News headline image
Quantum-Si Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)
From Quantum-Si Incorporated
Via Business Wire
News headline image
Quantum-Si Q1 Earnings Call Highlights ↗
Via MarketBeat
Topics Earnings
News headline image
Quantum-Si (QSI) Q1 2026 Earnings Transcript ↗
Via The Motley Fool
News headline image
Quantum-Si Reports First Quarter 2026 Financial Results and Highlights Proteus™ Development Milestones
From Quantum-Si Incorporated
Via Business Wire
News headline image
Quantum-Si to Participate in the H.C. Wainwright 4th Annual BioConnect Investor Conference at NASDAQ
From Quantum-Si Incorporated
Via Business Wire
News headline image
Quantum-Si Announces Successful Sequencing on Integrated Proteus™ Instruments
From Quantum-Si Incorporated
Via Business Wire
News headline image
Forget Neuralink: The Real Brain Tech Trade Has 10 Names You’ve Never Heard ↗
Via InvestorPlace
Topics Artificial Intelligence Economy Initial Public Offering
News headline image
Quantum-Si to Report First Quarter 2026 Financial Results on May 7, 2026
From Quantum-Si Incorporated
Via Business Wire
News headline image
Quantum-Si Announces Two Customer Posters to be Presented at the American Association of Cancer Research Annual Meeting
From Quantum-Si Incorporated
Via Business Wire
News headline image
Quantum-Si Announces New Manuscript Demonstrating the Value of Single-molecule Protein Sequencing to Aid in Identifying New Cancer Treatment Strategies
From Quantum-Si Incorporated
Via Business Wire
News headline image
Quantum-Si Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)
From Quantum-Si Incorporated
Via Business Wire
News headline image
Quantum-Si Announces First Customer Samples Tested on the Proteus™ Prototype System
From Quantum-Si Incorporated
Via Business Wire
News headline image
Quantum-Si Announces the Start of the Proteus™ Roadshow
From Quantum-Si Incorporated
Via Business Wire

Frequently Asked Questions

Is Quantum-Si Incorporated - Class A Common Stock publicly traded?
Yes, Quantum-Si Incorporated - Class A Common Stock is publicly traded.
What exchange does Quantum-Si Incorporated - Class A Common Stock trade on?
Quantum-Si Incorporated - Class A Common Stock trades on the Nasdaq Stock Market
What is the ticker symbol for Quantum-Si Incorporated - Class A Common Stock?
The ticker symbol for Quantum-Si Incorporated - Class A Common Stock is QSI on the Nasdaq Stock Market
What is the current price of Quantum-Si Incorporated - Class A Common Stock?
The current price of Quantum-Si Incorporated - Class A Common Stock is 0.7700
When was Quantum-Si Incorporated - Class A Common Stock last traded?
The last trade of Quantum-Si Incorporated - Class A Common Stock was at 09/17/26 04:00 PM ET
Stock Quote API & Stock News API supplied by www.cloudquote.io
Quotes delayed at least 20 minutes.
By accessing this page, you agree to the Privacy Policy and Terms Of Service.
© 2025 FinancialContent. All rights reserved.