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

Mickf2022 Jul. 15 at 1:13 PM

$QSI There's no way management would go down the road to forfeit earnings for 2026 if they weren't confident of the roll out of proteus.by year end.

1 · Reply

big_dipper1546 Jul. 14 at 1:54 PM

$QSI why is it gapping up? Why Maria?

0 · Reply

Brodman Jul. 14 at 11:33 AM

$QSI Out of business EOY 2026

1 · Reply

Mickf2022 Jul. 14 at 5:27 AM

$QSI Facts matter!!!

1 · Reply

CelticBeast Jul. 13 at 1:26 PM

$QSI what are we 20 days under a dollar, need some positive news to support price! 😵‍💫🍀

1 · Reply

Mickf2022 Jul. 10 at 10:06 PM

$QSI Still holding strong

0 · Reply

Morty752 Jul. 10 at 6:12 PM

$QSI The biggest problem with this stock is that management and insiders sell whenever there is a tiny spike. If they don't believe in their own shit, how come other would believe in it!!??

3 · Reply

Morty752 Jul. 10 at 6:04 PM

$QSI Will this shit ever be 2 bucks again? 😄

1 · Reply

big_dipper Jul. 10 at 2:07 AM

$QSI Q1 2026 fully “integrated system” delivered and operational Q2 End2end sequencing on fully integrated system Collaboration with external customers

0 · Reply

11thestate Jul. 9 at 1:45 PM

$QSI / $CAPA stock dropped over 70% after investors alleged HighCape Capital and Quantum-Si overstated the company’s commercialization plans and business outlook, leading to a $7.6M investor settlement. If you bought or held $QSI shares in 2021 you may still be able to recover losses, late claims are currently being considered: https://11th.com/cases/highcapecapital-investor-settlement

0 · Reply

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

2026-06-10T12:10:49.000Z - 5 weeks ago

Quantum-Si announces partnership with Cell Signaling Technology

Jun 10, 2026, 8:00 AM EDT - 5 weeks ago

Quantum-Si and Cell Signaling Technology Partner to Advance Post-Translational Modification Analysis on Proteus™

2026-06-03T13:20:36.000Z - 6 weeks ago

Quantum-Si announces expansion of Proteus Roadshow

Jun 3, 2026, 8:00 AM EDT - 6 weeks ago

Quantum-Si Announces the Expansion of the Proteus™ Roadshow

May 19, 2026, 4:00 PM EDT - 2 months ago

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

May 7, 2026, 4:30 PM EDT - 2 months ago

Quantum-Si incorporated Earnings Call Transcript: Q1 2026

May 7, 2026, 4:30 PM EDT - 2 months ago

Quantum-Si incorporated Earnings release: Q1 2026

May 7, 2026, 4:30 PM EDT - 2 months ago

Quantum-Si incorporated Quarterly report: Q1 2026

May 7, 2026, 4:05 PM EDT - 2 months ago

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

May 1, 2026, 8:30 AM EDT - 2 months ago

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

2026-04-28T12:59:57.000Z - 2 months ago

Quantum-Si announces sequencing on Integrated Proteus instruments

Apr 28, 2026, 8:30 AM EDT - 2 months ago

Quantum-Si Announces Successful Sequencing on Integrated Proteus™ Instruments

Apr 16, 2026, 8:30 AM EDT - 3 months ago

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

2026-04-15T12:45:17.000Z - 3 months ago

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

Apr 15, 2026, 8:30 AM EDT - 3 months 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 - 3 months ago

Quantum-Si announces new manuscript on bioRxiv

Apr 14, 2026, 8:30 AM EDT - 3 months ago

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

2026-04-08T13:40:07.000Z - 3 months ago

Quantum-Si announces customer samples tested on Proteus prototype system

2026-04-08T13:29:36.000Z - 3 months ago

Quantum-Si announces customer samples tested on Proteus prototype system

Apr 8, 2026, 9:15 AM EDT - 3 months ago

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

Apr 6, 2026, 9:40 AM EDT - 3 months ago

Quantum-Si Announces the Start of the Proteus™ Roadshow

Apr 1, 2026, 8:00 AM EDT - 3 months ago

Quantum-Si incorporated Proxy statement: Proxy filing

Apr 1, 2026, 8:00 AM EDT - 3 months ago

Quantum-Si incorporated Proxy statement: Proxy filing

2026-03-05T11:36:39.000Z - 4 months ago

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

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

Quantum-Si incorporated Earnings Call Transcript: Q4 2025

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

Quantum-Si incorporated Annual report: Q4 2025

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

Quantum-Si incorporated Earnings release: Q4 2025

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

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

Feb 10, 2026, 8:00 AM EST - 5 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 - 5 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 - 7 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 - 7 months ago

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

Nov 20, 2025, 3:30 PM EST - 8 months ago

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

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

Quantum-Si incorporated Transcript: Investor Day 2025

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

Nov 5, 2025, 4:30 PM EST - 8 months ago

Quantum-Si incorporated Earnings Call Transcript: Q3 2025

Nov 5, 2025, 4:30 PM EST - 8 months ago

Quantum-Si incorporated Quarterly report: Q3 2025

Nov 5, 2025, 4:30 PM EST - 8 months ago

Quantum-Si incorporated Earnings release: Q3 2025

Nov 5, 2025, 4:05 PM EST - 8 months ago

Quantum-Si Reports Third Quarter 2025 Financial Results

Oct 20, 2025, 8:00 AM EDT - 9 months ago

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

Oct 13, 2025, 8:00 AM EDT - 9 months ago

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

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

Quantum-Si incorporated Registration statement: Registration Filing

Sep 26, 2025, 8:00 AM EDT - 10 months ago

Quantum-Si incorporated Registration statement: Registration Filing

Sep 23, 2025, 8:00 AM EDT - 10 months ago

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

Sep 9, 2025, 10:00 AM EDT - 11 months ago

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

Sep 8, 2025, 8:00 AM EDT - 11 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 - 11 months ago

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

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

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

Aug 12, 2025, 4:00 PM EDT - 1 year ago

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

Aug 8, 2025, 8:00 AM EDT - 1 year ago

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

Aug 5, 2025, 4:30 PM EDT - 1 year ago

Quantum-Si incorporated Earnings Call Transcript: Q2 2025

Aug 5, 2025, 4:30 PM EDT - 1 year ago

Quantum-Si incorporated Quarterly report: Q2 2025

Aug 5, 2025, 4:30 PM EDT - 1 year ago

Quantum-Si incorporated Earnings release: Q2 2025

Aug 5, 2025, 4:05 PM EDT - 1 year ago

Quantum-Si Reports Second Quarter 2025 Financial Results

Jul 21, 2025, 8:00 AM EDT - 1 year ago

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

Jul 14, 2025, 8:00 AM EDT - 1 year ago

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

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

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

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

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

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

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, 4:30 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

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 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

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

Mickf2022 Jul. 15 at 1:13 PM

$QSI There's no way management would go down the road to forfeit earnings for 2026 if they weren't confident of the roll out of proteus.by year end.

1 · Reply

big_dipper1546 Jul. 14 at 1:54 PM

$QSI why is it gapping up? Why Maria?

0 · Reply

Brodman Jul. 14 at 11:33 AM

$QSI Out of business EOY 2026

1 · Reply

Mickf2022 Jul. 14 at 5:27 AM

$QSI Facts matter!!!

1 · Reply

CelticBeast Jul. 13 at 1:26 PM

$QSI what are we 20 days under a dollar, need some positive news to support price! 😵‍💫🍀

1 · Reply

Mickf2022 Jul. 10 at 10:06 PM

$QSI Still holding strong

0 · Reply

Morty752 Jul. 10 at 6:12 PM

$QSI The biggest problem with this stock is that management and insiders sell whenever there is a tiny spike. If they don't believe in their own shit, how come other would believe in it!!??

3 · Reply

Morty752 Jul. 10 at 6:04 PM

$QSI Will this shit ever be 2 bucks again? 😄

1 · Reply

big_dipper Jul. 10 at 2:07 AM

$QSI Q1 2026 fully “integrated system” delivered and operational Q2 End2end sequencing on fully integrated system Collaboration with external customers

0 · Reply

11thestate Jul. 9 at 1:45 PM

0 · Reply

Spartalaw Jul. 8 at 2:42 PM

$QSI

1 · Reply

Tl5000 Jul. 7 at 9:49 PM

$QSI look at kymera - focus on targeted proteins

0 · Reply

WalterWhite13 Jul. 7 at 6:37 PM

$QSI complete fraud. Nothing works, stock sucks, executives are sucking the blood out.

1 · Reply

big_dipper Jul. 7 at 3:39 AM

$QSI Canada’s Quantum Defence https://publications.gc.ca/site/eng/9.919592/publication.html

0 · Reply

CelticBeast Jul. 6 at 11:17 PM

$QSI 🤫🍀

0 · Reply

Lord_of_Wallstreet Jul. 4 at 6:49 AM

$QSI talk all the 💩 you want about QSI = however, it’s the only one that’s actually bullish “Positive” in the entire quantum sector at the moment. “ QSI. Is not quantum 🖕”

0 · Reply

Rebooter Jul. 3 at 5:09 PM

$QSI The future of biomedical research and the next Illumina has a $200 million market cap. A company that sells electric cars has a market cap 7500 times higher than that. Think about that. At some point, QSI's market cap will experience a significant rerate. It's a question of when, not if.

5 · Reply