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StockVS

NASDAQ · Medical Devices · USD

Quantum-Si incorporated (QSI) Stock Analysis

Quantum-Si incorporated (QSI) is a Medical Devices stock listed on NASDAQ and quoted in US Dollar.

Last Updated: October 21, 2026

QSI

$1.23

+$0.07 (+6.03%)

Oct 21, 2026 · Market close

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Price History

Hover for the daily close. The dotted line marks the period open.

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QSI Key Statistics

As of Oct 21, 2026
Trading
Open
$1.16
Previous Close
$1.16
Day's Range
1.16–1.23
52-Week Range
0.69–2.44
Volume
3.37M
BetaHow much the share price moves relative to the wider market. 1.0 moves in line with it; above 1.0 swings more, below 1.0 less.
3.22
Valuation
Market Cap
$269.23M
P/E Ratio
unprofitable
P/S ratioMarket value divided by annual revenue. Useful for companies that are not yet profitable, where a P/E cannot be calculated.
167.74
EPS (ttm)Profit attributable to each share over the last twelve months.
−0.45
Financials (FY)
Revenue (FY)
$2.44M−20.34%
Net Income (FY)
−$101.34M
Shares OutstandingThe total number of shares held by all investors. Market value is this figure multiplied by the share price.
198.95M
1-Year Return
−47.44%
Dividend and dates
Earnings Date
November 5, 2026
Avg Volume
5.33M

Only metrics the company reports are shown. Data provided by Yahoo Finance via yfinance. Updated daily.

Key facts

As of October 21, 2026, QSI closed at $1.23, −47.44% over 1 year.

Quantum-Si incorporated (QSI) has a market capitalization of $269.23M.

In fiscal 2025, QSI reported revenue of $2.44M.

QSI Stock Return by Calendar Year

Quantum-Si incorporated (QSI) return since Nov 2020: what $10,000 became

1 year
$10,000 $5,256
−47.44%
5 years
$10,000 $1,449
−85.51%
Since Nov 2020
$10,000 $1,245
−87.55%

If you had invested $10,000 in Quantum-Si incorporated (QSI) at the close on November 13, 2020, the earliest close on record here, it would have been worth $1,245 at the close on October 21, 2026: −87.55% in total, −29.60% a year, over a partial period shorter than 10 years. A historical calculation from closing prices adjusted for splits and dividends, before fees and taxes.

Calendar-year returns computed from daily closing prices. Partial years are shown muted and marked with an asterisk.

YearReturn
2026 (partial year)+11.82%
2025−59.26%
2024+34.33%
2023+9.84%
2022−76.75%
2021−22.46%
2020 (partial year)+2.73%

As of October 21, 2026.

QSI Revenue and Earnings by Fiscal Year

FY ends December
Fiscal yearRevenueNet incomeNet margin
2025$2.44M−$101.34M−4,160.1%
2024$3.06M−$101.01M−3,303.0%
2023$1.08M−$95.96M−8,868.8%
2022$0.00−$132.44M—
Fiscal yearRevenueGross profitOperating incomeNet incomeNet margin
2025$2.44M$1.15M−$97.36M−$101.34M−4,160.1%
2024$3.06M$1.60M−$108.58M−$101.01M−3,303.0%
2023$1.08M$488.00K−$111.17M−$95.96M−8,868.8%
2022$0.00$0.00−$114.36M−$132.44M—

Annual figures as reported, in the company's reporting currency. As of December 31, 2025.

QSI Valuation vs Medical Devices Median

Median of 145 stocks
MetricQSIMedical Devices medianvs median
P/S ratio167.742.5366.3x the median

Medians across 145 Medical Devices stocks that report the metric. Medians, not averages, so one outlier cannot move them. As of October 21, 2026.

Recent News

All 20 articles ↓

News provided by third-party sources. Not financial advice.

Analysis

Data-derived

Company Overview

Quantum-Si incorporated (QSI) carries a market capitalisation of $269.23M. It is classified in the Medical Devices industry, within the Healthcare sector. The company reports 145 employees.

QSI last closed at $1.23 on October 21, 2026. That is +$0.07 (+6.03%) against the previous close. The 52-week range on file runs from $0.69 to $2.44. The latest close sits 78.26% above that 52-week low.

Financial Health

In fiscal 2025, Quantum-Si incorporated reported revenue of $2.44M. That is −20.34% against the prior fiscal year, when revenue was $3.06M. The same year closed with a net loss of $101.34M. Earnings per share on a trailing basis come to −0.45.

Across the 4 fiscal years on file, revenue moves from $0.00 in 2022 to $2.44M in 2025. Of those 4 years, 0 report positive net income.

Valuation Assessment

The record shows negative trailing earnings, so no price-to-earnings ratio is published. The price-to-sales ratio is 167.74. On price-to-sales that is 66.3 times the Medical Devices median of 2.53. 145 Medical Devices companies report these metrics, and the medians quoted come from that group.

The reported beta is 3.22. Daily returns over the trailing 5 years annualize to a volatility of 127.26%. Over the trailing twelve months the total return is −47.44%. Measured over 5 years, that is −32.05% a year compounded.

Growth & Income

The record shows no dividend for QSI.

The strongest complete calendar year on file is 2024 at +34.33%; the weakest is 2022 at −76.75%. Of the 5 complete calendar years on file, 2 finished higher. 2026 is still running; the total return is +11.82% year to date.

Peer Comparison

Quantum-Si incorporated (QSI) operates in the Medical Devices industry. Here is how it compares to its closest peers by market capitalization:

Company Ticker Market Cap P/E Ratio
Quantum-Si incorporated QSI $269.23M —
Abbott Laboratories ABT $173.92B 32.4
Medtronic plc. MDT $119.00B 22.9
Stryker Corporation SYK $114.15B 30.8

The Medical Devices industry average P/E ratio is 27.1x. Quantum-Si incorporated has no P/E ratio because it is not currently profitable.

Every figure above is read from this page's own data on each daily rebuild. Informational only, not financial advice. As of October 21, 2026.

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About Quantum-Si incorporated

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 also provides Platinum analysis software, a cloud-based solution that automates data analysis workflows and visualizes the sequencing results. The company was founded in 2013 and is headquartered in Branford, Connecticut.

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