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QSIQuantum-Si incorporated
$1.40$277M
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QSI logo

Quantum-Si incorporated

QSI
NASDAQ · Biotechnology
$1.40
At close - Oct 23, 4:00 PM EDT - USD
Market Cap$277M
P/E-2.7x
52W High$2.44
Volume11.33M
OverviewTerminalAnalysisFinancialsValuationEarningsBreakoutsOwnership
VCP Research Verdict2026Q1

Persistent Revenue Contraction Threatens Proteomics Commercialization Viability

Quantum-Si faces a critical inflection point as the commercial rollout of its Platinum platform struggles to gain market traction, evidenced by a 69.4% year-over-year revenue decline in 2026Q1. The company's inability to achieve consistent manufacturing scale ...

GrowthContracting
ProfitabilityNegative
ValuationReview
TechnicalsStrong
Explore valuation models
MARKET ACTION

QSI price & volume

Price trend, volume and key moving averages

Launch Terminal
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Decision Checklist4 Core Signals

What matters now

The signals most likely to change the investment case.

01

Earnings momentum

8/12 Beats

EPS beat 8 of last 12 quarters

02

Valuation risk

-107% Peers

P/E is 107% below peer median

03

Market leadership

RS 95 · Leader

High momentum (Outperforming 95% of market)

04

Strong Uptrend

Strong Trend

Price > 20DMA > 50DMA > 200DMA

Next CatalystConfirmed earnings · Nov 5

Market performance

Price History →

Trailing total returns as of 10/24/2026, which may include dividends or other distributions. Benchmark is S&P 500 (^GSPC).

YTD Return
QSI+20.69%
S&P 500 (^GSPC)+11.24%
1-Year Return
QSI-36.36%
S&P 500 (^GSPC)+13.13%
3-Year Return
QSI+11.11%
S&P 500 (^GSPC)+111.62%
5-Year Return
QSI-83.19%
S&P 500 (^GSPC)+85.06%

Growth & profitability

Annual revenue & EPS trend
Revenue
$2M-20.3% YoY
Net income
-$101M-0.3% YoY
Free cash flow
-$97M-5.3% YoY
Operating margin
-3996.7%-446.2 pts YoY
ROIC (TTM)-38.2%
Avg ROIC 5Y-
ROE (TTM)-46.5%
Piotroski Score2 / 9
Financial Statements →
03

Monitor what changed

Recent results and news deserve attention only when they alter the forward view.

OPERATING RESULTS

Recent Earnings

Earnings History
EPS Beat Rate8/12 (67%)
Revenue Beat Rate3/12 (25%)
QuarterEPS (Act vs Est)Revenue (Act vs Est)
Q3 2026Latest
Aug 13, 2026
-$0.11+2.9%
vs -$0.11
$344,000+13.9%
vs $302,000
Q2 2026
May 7, 2026
-$0.10+16.7%
vs -$0.12
$258,000-13.6%
vs $298,667
Q2 2026
Mar 3, 2026
-$0.08+42.9%
vs -$0.14
$451,000-40.8%
vs $761,900
Q4 2025
Nov 5, 2025
-$0.17-41.7%
vs -$0.12
$552,000-7.9%
vs $599,330
Historical baseline: 12 quarters analyzedGAAP / Adjusted
MARKET COVERAGE

Latest News

5 Stories
GlobeNewsWire·Oct 16, 2026
Quantum-Si to Provide a Business Update and Report Third Quarter 2026 Financial Results on November 5, 2026

BRANFORD, Conn., Oct. 16, 2026 (GLOBE NEWSWIRE) -- Quantum-Si Incorporated (Nasdaq: QSI) (“Quantum-Si,” “QSI” or the “Company”), a proteomics technology company redefining protein analysis through single-molecule detection, today announced that it will provide a business update and report financial results for the third quarter 2026 on Thursday, November 5, 2026.

GlobeNewsWire·Oct 15, 2026
Quantum-Si Regains Compliance with Nasdaq Minimum Bid Price Requirement

BRANFORD, Conn., Oct. 15, 2026 (GLOBE NEWSWIRE) -- Quantum-Si Incorporated (Nasdaq: QSI) (“Quantum-Si,” “QSI,” or the “Company”), a proteomics company redefining protein analysis through single-molecule protein sequencing, today announced that it has received written notice from the Listing Qualifications Department (the “Staff”) of The Nasdaq Stock Market LLC (“Nasdaq”) stating that the Company has regained compliance with the minimum bid price requirement for continued listing on The Nasdaq Global Market under Listing Rule 5450(a)(1).

Seeking Alpha·Oct 11, 2026
Leading Indicators For The October Breakout Cycle

Q4 historically delivers outsized S&P 500 returns, especially following midterm election years, supporting the 'October breakout cycle' thesis. Since 2000, the gains in the fourth quarter have averaged more than half of the S&P 500's annual returns with more positive years than all the other quarters. Small cap healthcare/biotech, technology, and consumer cyclicals—like PRME, CRNC, and FOSL—are highlighted as early breakout candidates with strong institutional interest and analyst targets.

InvestorPlace·Oct 9, 2026
Beyond Elon Musk's Neuralink: Two Public Stocks With a Stake in the Brain Race

Elon Musk's Neuralink is giving us a glimpse of a future in which the human brain can communicate directly with computers. For investors, there's just one problem: You can't buy Neuralink stock.

Filtered for Quantum-Si incorporatedMore Headlines
04

Compare before deciding

Benchmark QSI against direct peers instead of judging its metrics in isolation.

Peers Comparison

Key metrics vs top competitors for Quantum-Si incorporated (QSI)

Full Screener →
CompanyPriceMarket CapP/E RatioRev Growth (1Y)Net MarginROEDiv Yield
QSI logoQSIQuantum-Si incorporatedCurrent
$1.40$276.95M-2.75-20.34%-4160.06%-46.52%—
PACB logoPACBPacific Biosciences of California, Inc.
$2.11$655.37M-1.163.89%-82.49%-4961.74%—
CDNA logoCDNACareDx, Inc
$69.21$3.58B-173.0313.79%24.23%32.81%—
ACMR logoACMRACM Research, Inc.
$50.55$3.24B36.9015.24%14.48%7.24%—
ILMN logoILMNIllumina, Inc.
$269.42$40.76B49.43-0.78%18.36%31.08%—
FLGT logoFLGTFulgent Genetics, Inc.
$20.10$570.85M-10.2013.83%-26.05%-7.91%—

Compare QSI vs Peers

Quantum-Si incorporated (QSI) vs competitors — business, growth, and fundamentals comparison against the closest industry rivals.

Closest Rival

vs PACB

Most directly comparable listed peer for QSI.

Scale Benchmark

vs TMO

Larger-name benchmark to compare QSI against a more recognizable public peer.

Peer Set

Compare Top 5

vs PACB, CDNA, ACMR, ILMN

05

Keep researching

Verify the primary filings, follow material updates, and answer the remaining questions.

QSI SEC Filings & Documents

Quantum-Si incorporated (QSI) SEC filings — annual & quarterly reports (10-K, 10-Q)

8-K Announcements

6
Material company update

Aug 13, 2026·SEC

Material company update

Jul 24, 2026·SEC

Material company update

Jun 24, 2026·SEC

10-K Annual Reports

3
FY 2026

Mar 3, 2026·SEC

FY 2025

Mar 3, 2025·SEC

FY 2024

Feb 29, 2024·SEC

10-Q Quarterly Reports

6
FY 2026

Aug 13, 2026·SEC

FY 2026

May 7, 2026·SEC

FY 2025

Nov 5, 2025·SEC

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QSI Frequently Asked Questions

Quantum-Si incorporated (QSI) stock FAQ — growth, dividends, profitability & financials explained

Growth & Financials
What is Quantum-Si incorporated's revenue?

Quantum-Si incorporated (QSI) reported $1.6M in revenue for fiscal year 2025.

How fast is Quantum-Si incorporated growing?

Quantum-Si incorporated (QSI) saw revenue decline by 20.3% over the past year.

Is QSI profitable?

Quantum-Si incorporated (QSI) reported a net loss of $98.5M for fiscal year 2025.

Dividend & Returns
What is QSI's return on equity?

Quantum-Si incorporated (QSI) has a return on equity (ROE) of -46.5%. Negative ROE indicates the company is unprofitable.

What is Quantum-Si incorporated's free cash flow?

Quantum-Si incorporated (QSI) had negative free cash flow of $93.7M in fiscal year 2025, likely due to heavy capital investments.

What if you invested $1,000 in QSI back in 2019?

Total return calculator · dividends reinvested · 7+ years of data

See returns →