What is QSI's market cap?

$284.55M, based on the Nov 3 close of $1.30.

Does Quantum-Si Incorporated pay a dividend?

No regular cash dividend has been paid in the last year.

How much of QSI is sold short?

13.2M shares, 7.8% of float, as of Oct 15, 2026.

What sector is QSI in?

Technology, in the Measuring Instruments industry.

NASDAQ · QSITechnologyMeasuring Instruments

Quantum-Si Incorporated Class A Common Stock (QSI)

$1.30+3.17%

Close Nov 3, 2026 · split-adjusted

Nov 2, 2026$1.26▼ 37.00% in range

Nov 3, 2025Low $0.70 · High $2.00Nov 2, 2026

What changed · written from our data

As of Nov 3, 2026

Quantum-Si Incorporated closed at $1.30 on Nov 3, up 3.17%, 39.5% below its 52-week closing high. Volume of 4.6M shares was 0.46× its 20-day average (below normal).

Split-adjusted performance: +1.6% over one month, +35.2% over six months, -39.5% over one year.

In the quarter ended Jun 30, 2026, revenue was $344K, down 41.8% from a year earlier, with a net margin of -6841.3%.

Short interest was 13.2M shares at the Oct 15 settlement, up 11.6% from the prior report (7.8% of float, 1.0 days to cover).

Market cap$284.5M218.9M shares

Revenue · quarter$344.0K−41.8% YoY

Diluted EPS$-0.11—

P/E · TTM—P/S 177.3×

Net margin-6,841.3%Gross 50.0%

Dividend yieldNone

52-week range0.70 – 2.15−39.5% from high

Volume4.6M0.46× 20-day avg

Volatility · 60d137.9%Annualised

Short % of float7.8%1.0 days to cover

Net cash$111.7MCash $111.7M

Next earnings—Not scheduled

Split-adjusted performance

1W −21.2%1M +1.6%3M +71.8%6M +35.2%YTD +18.2%1Y −39.5%3Y +13.5%5Y −84.1%

Earnings reactions

History →

No reported quarters with price history yet.

Rank within Measuring Instruments

Percentile among 9 companies (100 = best)

6-month momentum86

Revenue growth0

Net margin0

Value (low P/E)—

Size38

Industry medians: 6-month return −4.7%, revenue growth +10.1%, net margin −4.3%, P/E 58.0×.

Short interest

Details →

Shares short13.2M+11.6% vs prior

Days to cover1.0Settled Oct 15

% of float7.8%

Short vol. 10d43.2%of daily volume

Closest peers by size in Measuring Instruments

Company	Price	Today	6M	Rev. growth	Net margin	P/E	Mkt cap
QSIQuantum-Si Incorporated	$1.30	+3.17%	+35.2%	−41.8%	−6841.3%	—	$284.5M
OWLTOwlet	$4.23	−1.63%	−14.7%	+29.9%	−4.3%	—	$123.6M	Compare
GEOSGeospace Technologies	$4.08	−0.73%	−54.1%	−36.4%	−61.4%	—	$52.8M	Compare
BCHTBirchtech	$1.12	+3.23%	—	—	−79.6%	—	$29.5M	Compare
MIRMirion Technologies	$19.05	+1.98%	−5.4%	+24.5%	2.7%	161.3	$4.68B	Compare
ONTOOnto Innovation	$202.39	+5.74%	−33.6%	+35.3%	17.5%	74.9	$9.93B	Compare
TRMBTrimble	$65.61	−0.35%	−4.0%	+11.0%	−48.5%	—	$15.30B	Compare
ROKRockwell Automation	$446.38	+1.41%	+2.4%	+7.9%	17.6%	41.2	$49.57B	Compare
TMOThermo Fisher Scientific	$698.34	+2.30%	+49.6%	+9.1%	14.2%	36.6	$258.75B	Compare

News about Quantum-Si Incorporated

All news →

Quantum-Si to Provide a Business Update and Report Third Quarter 2026 Financial Results on November 5, 2026GlobeNewswire Inc. · Oct 16, 2026Neutral Quantum-Si Presents Interim Proteus™ Data at World HUPO 2026 Demonstrating a Significant Step Change in Performance Compared to Platinum® ProGlobeNewswire Inc. · Sep 29, 2026▲ Positive

Quick answers

What does Quantum-Si Incorporated do?: Quantum-Si Inc is a life sciences company focused on proteomics research and analytical technologies. It develops single-molecule detection platforms designed to enable next-generation protein sequencing (NGPS) and large-scale protein analysis.
What is QSI's market cap?: $284.55M, based on the Nov 3 close of $1.30.
Does Quantum-Si Incorporated pay a dividend?: No regular cash dividend has been paid in the last year.
How much of QSI is sold short?: 13.2M shares, 7.8% of float, as of Oct 15, 2026.
What sector is QSI in?: Technology, in the Measuring Instruments industry.

About Quantum-Si Incorporated

Quantum-Si Inc is a life sciences company focused on proteomics research and analytical technologies. It develops single-molecule detection platforms designed to enable next-generation protein sequencing (NGPS) and large-scale protein analysis. Its technology supports massively parallel sequencing of proteins and can also be applied to the study of nucleic acids, providing tools for researchers and clinical applications in molecular analysis. The company's revenue is derived from sales of products and services.

HQ: Branford, CT145 employeesListed Jun 11, 2021quantum-si.com

Sources: Massive / Polygon daily aggregates (split-adjusted) · SEC filings via Massive · FINRA settlements via Massive · Financial Modeling Prep. Figures are dated where shown; research is informational, not investment advice. Methodology