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

moneymavens May. 12 at 11:14 PM

$QSI flag chart waving all in and ready to move higher

0 · Reply

Chi2ggzz May. 12 at 9:30 PM

$QSI Nice flag I’m in for now

0 · Reply

LongMoneyMovements May. 12 at 8:19 PM

$QSI 2026-05-07 13F Rothschild Investment Llc bought 1,688 shares https://fintel.io/so/us/qsi

0 · Reply

LongMoneyMovements May. 12 at 8:17 PM

$QSI 2026-05-08 13F Vanguard Portfolio Management Llc bought 1,520,646 shares https://fintel.io/so/us/qsi

0 · Reply

LongMoneyMovements May. 12 at 8:16 PM

$QSI 2026-05-08 13F State Board Of Administration Of Florida Retirement System bought 41,282 https://fintel.io/so/us/qsi

0 · Reply

LongMoneyMovements May. 12 at 8:16 PM

$QSI 2026-05-12 13F ARK Investment Management LLC bought 6,878,899 shares https://fintel.io/so/us/qsi

0 · Reply

Moneypool May. 12 at 5:42 PM

$QSI I added 1000 at .91 Only have 4000 but the average now is 1.21

1 · Reply

Geevs1 May. 12 at 2:38 PM

$QSI buy more?

1 · Reply

moneymavens May. 12 at 1:56 PM

$QSI scuttlebutt is QSI tracking of viruses .. either way the 1$ has ben defended and the next leg is to 1.14 1.30 and then after all about the street making its move .. enjoy

1 · Reply

luminouslumens May. 12 at 1:47 PM

$QSI $ALP $FABC $MOBX

0 · Reply

Quantum-Si incorporated Earnings Call Transcript: Q1 2026

May 7, 2026, 4:05 PM EDT - 5 days ago

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

May 1, 2026, 8:30 AM EDT - 11 days ago

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

2026-04-28T12:59:57.000Z - 14 days ago

Quantum-Si announces sequencing on Integrated Proteus instruments

Apr 28, 2026, 8:30 AM EDT - 14 days ago

Quantum-Si Announces Successful Sequencing on Integrated Proteus™ Instruments

Apr 16, 2026, 8:30 AM EDT - 26 days ago

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

2026-04-15T12:45:17.000Z - 27 days ago

Quantum-Si announces two customer posters to be presented at AACR meeting

Apr 15, 2026, 8:30 AM EDT - 27 days ago

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

2026-04-14T12:37:56.000Z - 4 weeks ago

Quantum-Si announces new manuscript on bioRxiv

Apr 14, 2026, 8:30 AM EDT - 4 weeks ago

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

Apr 10, 2026, 5:30 PM EDT - 4 weeks ago

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

2026-04-08T13:40:07.000Z - 4 weeks ago

Quantum-Si announces customer samples tested on Proteus prototype system

2026-04-08T13:29:36.000Z - 4 weeks ago

Quantum-Si announces customer samples tested on Proteus prototype system

Apr 8, 2026, 9:15 AM EDT - 4 weeks ago

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

Apr 6, 2026, 9:40 AM EDT - 5 weeks ago

Quantum-Si Announces the Start of the Proteus™ Roadshow

2026-03-05T11:36:39.000Z - 2 months ago

Quantum-Si price target lowered to $1 from $1.50 at Canaccord

Mar 3, 2026, 4:30 PM EST - 2 months ago

Quantum-Si incorporated Earnings Call Transcript: Q4 2025

Mar 3, 2026, 4:05 PM EST - 2 months ago

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

Feb 10, 2026, 8:00 AM EST - 3 months ago

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

Feb 5, 2026, 8:00 AM EST - 3 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

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

2025-12-22T12:00:37.000Z - 5 months ago

Quantum-Si price target lowered to $1.50 from $2 at Canaccord

2025-11-24T13:45:19.000Z - 6 months ago

Largest borrow rate increases among liquid names

AISP DFDV DUST MREO RVPH SMCX

Nov 20, 2025, 3:30 PM EST - 6 months ago

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

Nov 20, 2025, 8:00 AM EST - 6 months ago

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

Nov 19, 2025, 10:00 AM EST - 6 months ago

Quantum-Si incorporated Transcript: Investor Day 2025

Nov 19, 2025, 8:00 AM EST - 6 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

2025-11-07T18:16:05.000Z - 6 months ago

Quantum-Si price target lowered to $2.50 from $3 at Alliance Global Partners

Nov 5, 2025, 4:30 PM EST - 6 months ago

Quantum-Si incorporated Earnings Call Transcript: Q3 2025

Nov 5, 2025, 4:05 PM EST - 6 months ago

Quantum-Si Reports Third Quarter 2025 Financial Results

2025-10-27T10:50:47.000Z - 7 months ago

Quantum-Si price target raised to $2 from $1 at Canaccord

Oct 20, 2025, 8:00 AM EDT - 7 months ago

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

Oct 13, 2025, 8:00 AM EDT - 7 months ago

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

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

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

Sep 9, 2025, 10:00 AM EDT - 8 months ago

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

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

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

Aug 19, 2025, 8:00 AM EDT - 9 months ago

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

Aug 14, 2025, 11:15 AM EDT - 9 months ago

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

Aug 12, 2025, 4:00 PM EDT - 9 months ago

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

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

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

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

Quantum-Si incorporated Earnings Call Transcript: Q2 2025

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

Quantum-Si Reports Second Quarter 2025 Financial Results

Jul 21, 2025, 8:00 AM EDT - 10 months ago

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

Jul 14, 2025, 8:00 AM EDT - 10 months ago

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

Jul 3, 2025, 8:34 PM EDT - 11 months ago

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

Jun 24, 2025, 8:00 AM EDT - 11 months ago

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

Jun 19, 2025, 8:00 AM EDT - 11 months ago

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

Jun 17, 2025, 8:00 AM EDT - 11 months ago

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

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

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

Quantum-Si incorporated Earnings Call Transcript: Q1 2025

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

Quantum-Si Reports First Quarter 2025 Financial Results

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

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

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

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

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

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

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

Quantum-Si incorporated Earnings Call Transcript: Q4 2024

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

IONQ QMCO 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™

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

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

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

Quantum-Si Expands International Distribution Network

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™

Dec 3, 2024, 8:30 AM EST - 1 year ago

Quantum-Si Introduces Protein Barcoding Kit for Multiplexed Protein Screening

moneymavens May. 12 at 11:14 PM

$QSI flag chart waving all in and ready to move higher

0 · Reply

Chi2ggzz May. 12 at 9:30 PM

$QSI Nice flag I’m in for now

0 · Reply

LongMoneyMovements May. 12 at 8:19 PM

$QSI 2026-05-07 13F Rothschild Investment Llc bought 1,688 shares https://fintel.io/so/us/qsi

0 · Reply

LongMoneyMovements May. 12 at 8:17 PM

$QSI 2026-05-08 13F Vanguard Portfolio Management Llc bought 1,520,646 shares https://fintel.io/so/us/qsi

0 · Reply

LongMoneyMovements May. 12 at 8:16 PM

$QSI 2026-05-08 13F State Board Of Administration Of Florida Retirement System bought 41,282 https://fintel.io/so/us/qsi

0 · Reply

LongMoneyMovements May. 12 at 8:16 PM

$QSI 2026-05-12 13F ARK Investment Management LLC bought 6,878,899 shares https://fintel.io/so/us/qsi

0 · Reply

Moneypool May. 12 at 5:42 PM

$QSI I added 1000 at .91 Only have 4000 but the average now is 1.21

1 · Reply

Geevs1 May. 12 at 2:38 PM

$QSI buy more?

1 · Reply

moneymavens May. 12 at 1:56 PM

$QSI scuttlebutt is QSI tracking of viruses .. either way the 1$ has ben defended and the next leg is to 1.14 1.30 and then after all about the street making its move .. enjoy

1 · Reply

luminouslumens May. 12 at 1:47 PM

$QSI $ALP $FABC $MOBX

0 · Reply

GoldenKnightsFan May. 12 at 1:46 PM

$QSI Any news? Hanta virus?

0 · Reply

Mbs7bro May. 12 at 12:44 AM

$QUBT $QSI

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dombomb809 May. 11 at 8:24 PM

$QSI with the trust me bro.

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mkultra May. 11 at 5:06 PM

$QSI is QSI the biggest scam on the stock market?

2 · Reply

Svitlana May. 11 at 2:15 PM

$QSI

1 · Reply

KindnessWins May. 11 at 1:56 PM

$QSI this thing wants to rip our faces off

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Rebooter May. 11 at 1:49 PM

$QSI $XBI $ARKG https://www.cnbc.com/2026/05/11/hantavirus-cases-pharma-stocks-surge-moderna-novavax.html

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WalterWhite13 May. 11 at 1:42 PM

$QSI out of business by end of year.

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BringDownThoseReps May. 11 at 1:42 AM

$QSI give it 12-18 months and they will own it for nothing .... 😂

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Gsmittypoos May. 10 at 9:49 PM

$QSI these big names don’t own this stock for nothing

1 · Reply

Rebooter May. 10 at 3:26 PM

$NAUT $QSI Inaccurate. Platinum/Proteus (Quantum-Si) is a protein sequencing platform, operating at single amino acid resolution. The closest direct competition is mass spectrometry. Voyager (Nautilus) is an affinity-based, single molecule platform for analysis of protein variations (proteoforms). The closest direct competition is a platform like SomaScan from Standard BioTools. If anything, the Voyager platform could be considered complementary to Platinum/Proteus, for downstream analysis of QSI output. Many core labs will utilize both. The market hasn't made a 'choice' in regards to either of them.

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HypnoTrader May. 9 at 4:37 PM

$NAUT and $QSI are direct competitors, although with different approaches to the same problem. Both are de facto pre-revenue. Yet naut is in uptrend, while qsi stuck in a range. Market made a choice?

2 · Reply

Market Cap	199.54M
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	10,063,399
Avg Vol	4,934,516
Day's Range	N/A - N/A
Shares Out	216.37M
Stochastic %K	42%
Beta	3.15
Analysts	Sell
Price Target	$2.50