Quantum-Si Inc (QSI) Stock Price, Quote & News

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...

Industry: Medical Devices

Sector: Healthcare

Phone: 866 688 7374

Website: www.quantum-si.com

Address:

29 Business Park Drive, Branford, United States

Determinedstocks Jun. 4 at 9:47 PM

$QSI lung cancer and 14 proteins https://www.nytimes.com/2026/06/04/well/lung-cancer-prevention.html?smid=nytcore-ios-share

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425Pyrat Jun. 4 at 8:05 PM

$QSI well, no bang into close today. Guess I'll just have to be happy with green 6%

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Lincoln1962 Jun. 4 at 7:39 PM

$QSI

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425Pyrat Jun. 4 at 7:21 PM

$QSI Give me 1.30+ close with 10m+ volume

1 · Reply

motherlandreturns Jun. 4 at 5:19 PM

$QSI Is there any news on why this is up?

1 · Reply

permedbull Jun. 4 at 5:15 PM

$QSI cleared on runway 5. cabin crew prepare for takeoff ✈️

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Bullshyte Jun. 4 at 4:28 PM

$QSI Phenomenally

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Mickf2022 Jun. 4 at 4:25 PM

$QSI @johnnytom

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Akhedr1 Jun. 4 at 4:22 PM

$QSI 👌

1 · Reply

Moamen22 Jun. 4 at 4:21 PM

$QSI why is this going up?

1 · Reply

Quantum-Si Announces the Expansion of the Proteus™ Roadshow

QSI

May 19, 2026, 4:00 PM EDT - 16 days ago

Quantum-Si incorporated Transcript: H.C. Wainwright 4th Annual BioConnect Investor Conference

May 13, 2026, 8:00 PM EDT - 22 days ago

Quantum-Si Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)

QSI

May 7, 2026, 4:30 PM EDT - 4 weeks ago

Quantum-Si incorporated Earnings Call Transcript: Q1 2026

May 7, 2026, 4:30 PM EDT - 4 weeks ago

Quantum-Si incorporated Earnings release: Q1 2026

May 7, 2026, 4:30 PM EDT - 4 weeks ago

Quantum-Si incorporated Quarterly report: Q1 2026

May 7, 2026, 4:05 PM EDT - 4 weeks ago

Quantum-Si Reports First Quarter 2026 Financial Results and Highlights Proteus™ Development Milestones

QSI

May 1, 2026, 8:30 AM EDT - 4 weeks ago

Quantum-Si to Participate in the H.C. Wainwright 4th Annual BioConnect Investor Conference at NASDAQ

QSI

Apr 28, 2026, 8:30 AM EDT - 5 weeks ago

Quantum-Si Announces Successful Sequencing on Integrated Proteus™ Instruments

QSI

Apr 16, 2026, 8:30 AM EDT - 7 weeks ago

Quantum-Si to Report First Quarter 2026 Financial Results on May 7, 2026

QSI

Apr 15, 2026, 8:30 AM EDT - 7 weeks ago

Quantum-Si Announces Two Customer Posters to be Presented at the American Association of Cancer Research Annual Meeting

QSI

Apr 14, 2026, 8:30 AM EDT - 7 weeks ago

Quantum-Si Announces New Manuscript Demonstrating the Value of Single-molecule Protein Sequencing to Aid in Identifying New Cancer Treatment Strategies

QSI

Apr 8, 2026, 9:15 AM EDT - 2 months ago

Quantum-Si Announces First Customer Samples Tested on the Proteus™ Prototype System

QSI

Apr 6, 2026, 9:40 AM EDT - 2 months ago

Quantum-Si Announces the Start of the Proteus™ Roadshow

QSI

Apr 1, 2026, 8:00 AM EDT - 2 months ago

Quantum-Si incorporated Proxy statement: Proxy filing

Apr 1, 2026, 8:00 AM EDT - 2 months ago

Quantum-Si incorporated Proxy statement: Proxy filing

Mar 3, 2026, 4:30 PM EST - 3 months ago

Quantum-Si incorporated Earnings Call Transcript: Q4 2025

Mar 3, 2026, 4:30 PM EST - 3 months ago

Quantum-Si incorporated Annual report: Q4 2025

Mar 3, 2026, 4:30 PM EST - 3 months ago

Quantum-Si incorporated Earnings release: Q4 2025

Mar 3, 2026, 4:05 PM EST - 3 months ago

Quantum-Si Reports Fourth Quarter and Full Year 2025 Financial Results

QSI

Feb 10, 2026, 8:00 AM EST - 4 months ago

Quantum-Si to Report Fourth Quarter and Full Year 2025 Financial Results on March 3, 2026

QSI

Feb 5, 2026, 8:00 AM EST - 4 months ago

Quantum-Si Announces the Release of Two New Manuscripts Demonstrating the Value of Single-Molecule Protein Sequencing in Clinical Proteomics and Pathogen & Toxin Detection

QSI

Dec 22, 2025, 8:00 AM EST - 5 months ago

Quantum-Si Announces Launch of New Version 3 Library Preparation Kit and a Suite of Data Analysis Tool Enhancements

QSI

Nov 20, 2025, 3:30 PM EST - 7 months ago

Quantum-Si incorporated Transcript: CG MedTech, Diagnostics and Digital Health & Services Forum

Nov 20, 2025, 8:00 AM EST - 7 months ago

Quantum-Si Highlights Significant Development Advancements for Proteus™ and Industry Leading Technology Pipeline at Investor & Analyst Day

QSI

Nov 19, 2025, 10:00 AM EST - 7 months ago

Quantum-Si incorporated Transcript: Investor Day 2025

Nov 19, 2025, 8:00 AM EST - 7 months ago

Quantum-Si to Highlight Significant Proteus™ Platform Development Progress and Provide Insights into the Company's Industry Leading Technology Pipeline at Investor & Analyst Day

QSI

Nov 5, 2025, 4:30 PM EST - 7 months ago

Quantum-Si incorporated Earnings Call Transcript: Q3 2025

Nov 5, 2025, 4:30 PM EST - 7 months ago

Quantum-Si incorporated Quarterly report: Q3 2025

Nov 5, 2025, 4:30 PM EST - 7 months ago

Quantum-Si incorporated Earnings release: Q3 2025

Nov 5, 2025, 4:05 PM EST - 7 months ago

Quantum-Si Reports Third Quarter 2025 Financial Results

QSI

Oct 20, 2025, 8:00 AM EDT - 8 months ago

Quantum-Si to Participate in the Canaccord Genuity MedTech, Diagnostics and Digital Health & Services Forum

QSI

Oct 13, 2025, 8:00 AM EDT - 8 months ago

Quantum-Si to Report Third Quarter 2025 Financial Results on November 5, 2025

QSI

Oct 9, 2025, 8:00 AM EDT - 8 months ago

Quantum-Si incorporated Registration statement: Registration Filing

Sep 26, 2025, 8:00 AM EDT - 8 months ago

Quantum-Si incorporated Registration statement: Registration Filing

Sep 23, 2025, 8:00 AM EDT - 9 months ago

Quantum-Si to Host Investor & Analyst Event in New York City on November 19, 2025

QSI

Sep 9, 2025, 10:00 AM EDT - 9 months ago

Quantum-Si incorporated Transcript: H.C. Wainwright 27th Annual Global Investment Conference

Sep 8, 2025, 8:00 AM EDT - 9 months ago

Quantum-Si Announces the Launch of V4 Sequencing Kit, Expanding Proteome Coverage and Unlocking New Applications for Protein Sequencing

QSI

Aug 19, 2025, 8:00 AM EDT - 10 months ago

Quantum-Si to Participate in the H.C. Wainwright 27th Annual Global Investment Conference

QSI

Aug 14, 2025, 11:15 AM EDT - 10 months ago

Quantum-Si incorporated Transcript: UBS Precision Medicine Frontiers Summit Conference

Aug 12, 2025, 4:00 PM EDT - 10 months ago

Quantum-Si incorporated Transcript: Canaccord Genuity’s 45th Annual Growth Conference

Aug 8, 2025, 8:00 AM EDT - 10 months ago

Quantum-Si to Participate in the UBS Precision Medicine Frontiers Summit

QSI

Aug 5, 2025, 4:30 PM EDT - 10 months ago

Quantum-Si incorporated Earnings Call Transcript: Q2 2025

Aug 5, 2025, 4:30 PM EDT - 10 months ago

Quantum-Si incorporated Quarterly report: Q2 2025

Aug 5, 2025, 4:30 PM EDT - 10 months ago

Quantum-Si incorporated Earnings release: Q2 2025

Aug 5, 2025, 4:05 PM EDT - 10 months ago

Quantum-Si Reports Second Quarter 2025 Financial Results

QSI

Jul 21, 2025, 8:00 AM EDT - 11 months ago

Quantum-Si to Participate in the Canaccord Genuity 45th Annual Growth Conference

QSI

Jul 14, 2025, 8:00 AM EDT - 11 months ago

Quantum-Si to Report Second Quarter 2025 Financial Results on August 5, 2025

QSI

Jul 3, 2025, 8:34 PM EDT - 1 year ago

Quantum-Si Incorporated Announces Pricing of $50 Million Registered Direct Offering of Common Stock

QSI

Jun 24, 2025, 8:00 AM EDT - 1 year ago

Quantum-Si Platinum® Pro Instrument Placed at the Broad Institute to Support Regional Research Initiatives

QSI

Jun 19, 2025, 8:00 AM EDT - 1 year ago

Quantum-Si to Join Leading Experts from DNAnexus, Olink, and Northwestern in Upcoming GenomeWeb Webinar on Proteomics Data Integration and Standardization

QSI

Jun 17, 2025, 8:00 AM EDT - 1 year ago

Quantum-Si Customer to Showcase Protein Barcoding for Nucleic Acid–LNP Therapeutic Development at Festival of Genomics Boston

QSI

Jun 10, 2025, 8:00 AM EDT - 1 year ago

Quantum-Si's Single-Molecule Tech Enables Precise, Multiplexed Measurement of Nanobody Binding in a Single Assay

QSI

May 15, 2025, 4:30 PM EDT - 1 year ago

Quantum-Si incorporated Earnings Call Transcript: Q1 2025

May 15, 2025, 4:30 PM EDT - 1 year ago

Quantum-Si incorporated Quarterly report: Q1 2025

May 15, 2025, 4:30 PM EDT - 1 year ago

Quantum-Si incorporated Earnings release: Q1 2025

May 15, 2025, 4:05 PM EDT - 1 year ago

Quantum-Si Reports First Quarter 2025 Financial Results

QSI

May 12, 2025, 8:00 AM EDT - 1 year ago

Dr. Gloria Sheynkman from the University of Virginia to Present Pioneering Research utilizing Quantum-Si's Next-Gen Protein Sequencing™ Platform in Upcoming Nature Webinar on May 15

QSI

Apr 24, 2025, 8:00 AM EDT - 1 year ago

Quantum-Si to Report First Quarter 2025 Financial Results on May 15, 2025

QSI

Mar 26, 2025, 8:00 AM EDT - 1 year ago

Quantum-Si Begins Shipping Platinum® Pro, Advancing Accessibility in Next-Gen Protein Sequencing™

QSI

Mar 24, 2025, 6:01 AM EDT - 1 year ago

Quantum-Si to Participate in DNAnexus Webinar on Large Scale Proteomics in Multi-Omics Research

QSI

Mar 20, 2025, 8:00 AM EDT - 1 year ago

Quantum-Si incorporated Proxy statement: Proxy Filing

Mar 20, 2025, 8:00 AM EDT - 1 year ago

Quantum-Si incorporated Proxy statement: Proxy Filing

Mar 3, 2025, 4:30 PM EST - 1 year ago

Quantum-Si incorporated Earnings Call Transcript: Q4 2024

Mar 3, 2025, 4:30 PM EST - 1 year ago

Quantum-Si incorporated Annual report: Q4 2024

Mar 3, 2025, 4:30 PM EST - 1 year ago

Quantum-Si incorporated Earnings release: Q4 2024

Mar 3, 2025, 4:05 PM EST - 1 year ago

Quantum-Si Reports Fourth Quarter and Full Year 2024 Financial Results

QSI

Feb 18, 2025, 4:05 PM EST - 1 year ago

Quantum-Si's Customers and Researchers to Showcase Next-Generation Protein Sequencing™ at AGBT 2025

QSI

Feb 13, 2025, 8:00 AM EST - 1 year ago

Quantum-Si and Researchers to Showcase Next-Generation Protein Sequencing™ at US HUPO 2025

QSI

Feb 12, 2025, 8:00 AM EST - 1 year ago

Quantum-Si to Report Fourth Quarter and Full Year 2024 Financial Results on March 3, 2025

QSI

Feb 4, 2025, 8:00 AM EST - 1 year ago

Quantum-Si Establishes Scientific Advisory Board to Shape Next-Generation Proteomic Technologies

QSI

Jan 28, 2025, 8:00 AM EST - 1 year ago

Quantum-Si and IDEX Health & Science to Partner on Optics Module for Proteus™ Instrument

QSI

Jan 20, 2025, 8:00 AM EST - 1 year ago

Quantum-Si Showcases Advances in Multiomics at the Festival of Genomics UK

QSI

Jan 13, 2025, 8:00 AM EST - 1 year ago

Quantum-Si Launches Platinum® Pro: The End-to-End Solution for Deeper Insights in Proteomics

QSI

Jan 8, 2025, 8:00 AM EST - 1 year ago

Quantum-Si's New Preprint Showcases Protein Barcoding as a Powerful Tool for Transforming Proteomics

QSI

Dec 27, 2024, 3:11 AM EST - 1 year ago

RGTI, QSI, QMCO, IONQ stocks are surging: time to short them?

IONQ QMCO QSI RGTI

Dec 20, 2024, 8:00 AM EST - 1 year ago

Quantum-Si's New Preprint Showcases Advances in Protein Variant Detection using ProteoVue™ Software with Next-Generation Protein Sequencing™

QSI

Dec 18, 2024, 8:00 AM EST - 1 year ago

Quantum-Si Announces Inducement Grant Under Nasdaq Listing Rule 5635(c)(4)

QSI

Dec 12, 2024, 5:00 AM EST - 1 year ago

Quantum-Si Expands International Distribution Network

QSI

Dec 4, 2024, 8:30 AM EST - 1 year ago

Quantum-Si Launches Platinum® New Library Prep Kit, Expanding Access to Next-Generation Protein Sequencing™

QSI

Determinedstocks Jun. 4 at 9:47 PM

$QSI lung cancer and 14 proteins https://www.nytimes.com/2026/06/04/well/lung-cancer-prevention.html?smid=nytcore-ios-share

0 · Reply

425Pyrat Jun. 4 at 8:05 PM

$QSI well, no bang into close today. Guess I'll just have to be happy with green 6%

0 · Reply

Lincoln1962 Jun. 4 at 7:39 PM

$QSI

0 · Reply

425Pyrat Jun. 4 at 7:21 PM

$QSI Give me 1.30+ close with 10m+ volume

1 · Reply

motherlandreturns Jun. 4 at 5:19 PM

$QSI Is there any news on why this is up?

1 · Reply

permedbull Jun. 4 at 5:15 PM

$QSI cleared on runway 5. cabin crew prepare for takeoff ✈️

0 · Reply

Bullshyte Jun. 4 at 4:28 PM

$QSI Phenomenally

0 · Reply

Mickf2022 Jun. 4 at 4:25 PM

$QSI @johnnytom

0 · Reply

Akhedr1 Jun. 4 at 4:22 PM

$QSI 👌

1 · Reply

Moamen22 Jun. 4 at 4:21 PM

$QSI why is this going up?

1 · Reply

Gsmittypoos Jun. 4 at 4:21 PM

$QSI

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Mickf2022 Jun. 4 at 4:17 PM

$QSI this is where whales come into a stock on technical milestones..and momentum can be aggressive.

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johnnytom Jun. 4 at 4:14 PM

$QSI can someone explain the potential here

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Rebooter Jun. 4 at 3:57 PM

$QSI In case you were wondering, today will be the 10th consecutive close above $1 for QSI, meaning the company will officially be in compliance with NASDAQ listing requirements and therefore not at risk for a delist or reverse split.

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Mickf2022 Jun. 4 at 3:20 PM

$QSI we poked through the 200 day MA on Tues but it dropped back Wednesday and now hopefully it's confirmed today... This is a extremely bullish...and I'm not messing...it started 2 weeks ago when it bottomed

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blucpa Jun. 4 at 3:19 PM

$QSI solid start need to close above 1.26 today..

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Carnegieinrarematerials Jun. 4 at 2:55 PM

$QSI

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supplySHOCK Jun. 4 at 9:35 AM

$CORN.X $MNDY $VERA $QSI find

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big_dipper1546 Jun. 4 at 12:00 AM

$QSI Compny website validating Stock Market News video by Josh and partner https://www.quantum-si.com/press-releases/quantum-si-announces-the-expansion-of-the-proteus-roadshow/

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big_dipper1546 Jun. 3 at 10:41 PM

$QSI Too busy watching pretty girls go by. LOL. Well the PROTEUS PLATFORM do actually WORK. LOAD UP This baby will be on its way to commercialization and a $40+ price tag. https://youtu.be/yfDmp9mtCHA?si=b52qylHP4YQ_MrLV

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Akhedr1 Jun. 3 at 8:00 PM

$QSI Tomorrow we hit $1.30 at least

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OkieDokieTrader Jun. 3 at 6:03 PM

$QMCO Bought it!!! This thing is a small cap as well. The quantum narrative has started to really ramp up this week. Also keep an eye on $IBM $IONQ $QSI and there’s several others I’m not thinking of at the moment.

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Market Cap	259.13M
Revenue (ttm)	2.44M
Net Income (ttm)	-101.34M
EPS (ttm)	N/A
PE Ratio	0.00
Forward PE	N/A
Profit Margin	-4,153.28%
Debt to Equity Ratio	0.00

Volume	9,545,900
Avg Vol	5,869,142
Day's Range	N/A - N/A
Shares Out	217.76M
Stochastic %K	93%
Beta	3.18
Analysts	Sell
Price Target	$2.50