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

Company Profile

Quantum-Si incorporated, a life sciences company, engages in the development of single-molecule detection platform to enable Next Generation Protein Sequencing (NGPS). The company offers Platinum NGPS instrument that provides single molecule amino acid level resolution with a streamlined workflow, including automated data analysis that accessible to researchers in all laboratory types; Platinum Pro NGPS instrument, a single molecule amino acid resolution, which provides an enhanced user interfac...

Industry: Medical Devices

Sector: Healthcare

Phone: 866 688 7374

Website: www.quantum-si.com

Address:

29 Business Park Drive, Branford, United States

Gsmittypoos Dec. 14 at 2:25 AM

$QSI noble prize winner coming up. I’m not selling until this goes way, way up. You suckers can keep selling!

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TheUnmaker Dec. 13 at 12:35 AM

$QSI needs more pain. I see under 1.15 as possible entry levels. Bring down the stock price more, many of us are waiting on the side lines.

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Determinedstocks Dec. 12 at 9:39 PM

$QSI Until they roll out Proteus - a year from now - this is a dead stock. There are no real catalysts in sight, save for a surprise in sales of PPro or some amazing partnership that adds revenue. Why buy into PPro now if Proteus is coming down the pike (especially when academic funding in the US is in free fall)? The tech continues to improve - 20 amino acids is amazing. That's also a year+ away, if all goes to plan. I think the stock price can easily slip back below $1 between now and next year and that seems extremely risky given the lack of upcoming catalysts. A delisting and/or reverse stock split would suck. I'm strapped in, but I'm not happy about it. Someone talk me off the ledge...

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Gsmittypoos Dec. 12 at 9:14 PM

$QSI bad seven percent drop and then a little pop after hours, which equates to massive manipulation. I’ve seen this for years and years, and just goes to show the SEC isn’t doing its job at all. No one goes to prison for stealing retail money.

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ragingOx Dec. 12 at 3:11 PM

$QSI Mistake

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BankoCapital Dec. 12 at 2:46 PM

$QSI Loaded up at 1.46 couple thousand shares. Was driving a rally last time from 1.50 to 2.02 and sold. Loaded up again. Cheers mates.

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Tothemoonemoji Dec. 11 at 8:35 PM

$QSI I find it very annoying that the price stays rangebound, but millions of shares trade every day. Im in other stocks where less than a quarter of this volume trades daily. Idk who keeps buying and selling this

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SolarWind Dec. 11 at 7:24 PM

$QSI

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LiuKang1 Dec. 11 at 5:23 PM

$QSI anyone still holding this pos? Still holding 5k shares - finger on the sell button but stock is wedging out hard.

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Forward16 Dec. 11 at 5:18 PM

$QSI wouldn’t the company have to file a 13G? Not sure just learning about all this….Here is what I found on 13G filings. Multiple companies that are major institutional investors in Quantum-Si (QSI) stock have filed Schedule 13G or 13G/A forms in 2025. The primary entities that filed recently are The Vanguard Group and ARK Investment Management LLC. The Vanguard Group filed a Schedule 13G on July 29, 2025, after acquiring beneficial ownership of over 5% of the company's shares, and subsequently an amended 13G/A on October 30, 2025, updating its holdings. Other companies that have filed Schedule 13G/A amendments in 2025 include: ARK Investment Management LLC (multiple filings in January, May, and June 2025) Nikko Asset Management Americas, Inc. (February 2025) Sumitomo Mitsui Trust Group, Inc. (February 2025)

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

Nov 19, 2025, 6:43 PM EST - 24 days ago

Quantum-Si incorporated (QSI) Analyst/Investor Day Transcript

Nov 19, 2025, 8:00 AM EST - 24 days 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, 11:01 PM EST - 5 weeks ago

Quantum-Si incorporated (QSI) Q3 2025 Earnings Call Transcript

Nov 5, 2025, 4:05 PM EST - 5 weeks ago

Quantum-Si Reports Third Quarter 2025 Financial Results

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

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

Oct 13, 2025, 8:00 AM EDT - 2 months ago

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

Oct 10, 2025, 4:35 PM EDT - 2 months ago

Why Quantum-Si Stock Flopped on Friday

Sep 23, 2025, 8:00 AM EDT - 2 months ago

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

Sep 15, 2025, 4:05 PM EDT - 3 months ago

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

Sep 8, 2025, 8:00 AM EDT - 3 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 - 4 months ago

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

Aug 8, 2025, 8:00 AM EDT - 4 months ago

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

Aug 5, 2025, 10:50 PM EDT - 4 months ago

Quantum-Si (QSI) Q2 Revenue Falls 47%

Aug 5, 2025, 7:54 PM EDT - 4 months ago

Quantum-Si incorporated (QSI) Q2 2025 Earnings Call Transcript

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

Quantum-Si Reports Second Quarter 2025 Financial Results

Jul 23, 2025, 7:30 AM EDT - 5 months ago

Quantum-Si Stock: A Small Position Is Warranted (Technical Analysis)

Jul 21, 2025, 8:00 AM EDT - 5 months ago

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

Jul 14, 2025, 8:00 AM EDT - 5 months ago

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

Jul 7, 2025, 8:19 AM EDT - 5 months ago

Tesla, Quantum-Si And Other Big Stocks Moving Lower In Monday's Pre-Market Session

TSLA

Jul 3, 2025, 8:34 PM EDT - 5 months ago

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

Jun 24, 2025, 8:00 AM EDT - 6 months ago

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

Jun 19, 2025, 8:00 AM EDT - 6 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 - 6 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 - 6 months ago

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

May 22, 2025, 7:30 AM EDT - 7 months ago

Quantum-Si: Sell On Weak Prospects And Risk Of Further Dilution

May 15, 2025, 8:24 PM EDT - 7 months ago

Quantum-Si incorporated (QSI) Q1 2025 Earnings Call Transcript

May 15, 2025, 4:05 PM EDT - 7 months ago

Quantum-Si Reports First Quarter 2025 Financial Results

May 12, 2025, 8:00 AM EDT - 7 months 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 - 8 months ago

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

Mar 26, 2025, 8:00 AM EDT - 9 months ago

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

Mar 24, 2025, 6:01 AM EDT - 9 months ago

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

Mar 11, 2025, 12:24 AM EDT - 9 months ago

Quantum-Si: A Rose, By Any Other Name, Wouldn't Smell As Sweet

Mar 3, 2025, 7:42 PM EST - 10 months ago

Quantum-Si incorporated (QSI) Q4 2024 Earnings Call Transcript

Mar 3, 2025, 4:05 PM EST - 10 months ago

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

Feb 18, 2025, 4:05 PM EST - 10 months ago

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

Feb 13, 2025, 8:00 AM EST - 10 months ago

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

Feb 12, 2025, 8:00 AM EST - 10 months ago

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

Feb 4, 2025, 8:00 AM EST - 11 months ago

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

Jan 28, 2025, 8:00 AM EST - 11 months ago

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

Jan 20, 2025, 8:00 AM EST - 11 months ago

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

Jan 13, 2025, 8:00 AM EST - 11 months 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

Jan 7, 2025, 9:30 AM EST - 1 year ago

Quantum-Si's 327% Rally In Six Months: Is Nvidia The Catalyst For More Gains?

NVDA

Dec 29, 2024, 9:30 AM EST - 1 year ago

Quantum-Si: The Technical Picture Has Improved (Rating Upgrade)

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™

Gsmittypoos Dec. 14 at 2:25 AM

$QSI noble prize winner coming up. I’m not selling until this goes way, way up. You suckers can keep selling!

0 · Reply

TheUnmaker Dec. 13 at 12:35 AM

$QSI needs more pain. I see under 1.15 as possible entry levels. Bring down the stock price more, many of us are waiting on the side lines.

0 · Reply

Determinedstocks Dec. 12 at 9:39 PM

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Gsmittypoos Dec. 12 at 9:14 PM

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ragingOx Dec. 12 at 3:11 PM

$QSI Mistake

1 · Reply

BankoCapital Dec. 12 at 2:46 PM

$QSI Loaded up at 1.46 couple thousand shares. Was driving a rally last time from 1.50 to 2.02 and sold. Loaded up again. Cheers mates.

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Tothemoonemoji Dec. 11 at 8:35 PM

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SolarWind Dec. 11 at 7:24 PM

$QSI

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LiuKang1 Dec. 11 at 5:23 PM

$QSI anyone still holding this pos? Still holding 5k shares - finger on the sell button but stock is wedging out hard.

3 · Reply

Forward16 Dec. 11 at 5:18 PM

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CelticBeast Dec. 10 at 11:11 PM

$QSI that’s it cmon 😵‍💫🙏🏻

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Tothemoonemoji Dec. 10 at 10:53 PM

$QSI So are we never going to find out who they raised the 50 million from?

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Rebooter Dec. 10 at 6:02 PM

$QSI

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SolarWind Dec. 10 at 5:38 PM

$QSI

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Estimize Dec. 9 at 9:00 PM

Wall St is expecting -0.12 EPS for $QSI Q4 [Reporting 03/09 AMC] http://www.estimize.com/intro/qsi?chart=historical&metric_name=eps&utm_con

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Mbs7bro Dec. 9 at 7:21 PM

$QSI No crying at the Casino!!! 🎰 Give me 3-5 by Jan 16th!!

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vu_jade Dec. 9 at 6:50 PM

$QSI end of year pop coming

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Smather84 Dec. 9 at 3:23 PM

$QSI we expecting anything of interest in tomorrows chit chat?

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DeerJuice Dec. 8 at 7:47 PM

$QSI 50pb drop is going to send us to $3+

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vu_jade Dec. 8 at 3:35 PM

$QSI almost punched through this AM .. It will

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Gsmittypoos Dec. 8 at 3:33 PM

$QSI this is our week! Interest rate cut Wed

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Market Cap	277.98M
Revenue (ttm)	3.06M
Net Income (ttm)	-101.01M
EPS (ttm)	N/A
PE Ratio	0.00
Forward PE	N/A
Profit Margin	-3,300.98%
Debt to Equity Ratio	0.00

Volume	5,641,000
Avg Vol	11,024,830
Day's Range	N/A - N/A
Shares Out	215.49M
Stochastic %K	11%
Beta	2.96
Analysts	Sell
Price Target	$2.83