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QuantumSi Inc (QSI) fair value: what the stock is really worth

As of Oct 20, 2026: fair value (intrinsic value) of QuantumSi Inc stock $0.65, price $1.16, upside -44.3%, quality 24 out of 100. Rating: strongly overvalued. Calculated from audited financials with 26 valuation models and 37 quality factors, updated daily.

  1. Fair value above price? No
  2. Good quality? No
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Healthcare · US · ISIN US74765K1051

QI QuantumSi Inc logo Thin data Oct 21, 2026

QuantumSi Inc

QSI · US

Weakest SetupStrongly overvalued and low quality.

Our calculation puts a fair price 44% below what the stock costs today.

Low debt
Mixed Growth (revenue 3y +74.4 %/yr in USD)
Fair value $0.6460 · Strongly overvalued (−44.3%)
Quality 24/100
Negative free cash flow
Trails peers (2/7)
Narrow moat 5/100 · thin data
Thin data
⚠ Dilution
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What runs behind every stock

26 valuation models 8 families, DCF to NCAV 37 quality factors margins, balance sheet, cashflow, debt 6 AI factors moat, what no ratio measures 2,000+ data points verified, per stock, median

69 individual criteria per stock, every one traceable See the method →

Price vs Fair Value

$12.72 $0.6330 Fair Value $0.6460 Jul 2021 Oct 2026

White line = price, green steps = our fair value per fiscal year, dashed = 300-day average. As of Oct 21, 2026.

How to read this chart

60‑month range $0.6330 – $12.72 · fair‑value band $0.4250 – $0.8075 · the $1.16 price screens above the $0.6460 fair value. Green steps = our fair value per fiscal year (point-in-time, no hindsight). Dashed = 300-day average. As of Oct 21, 2026.

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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 also provides Platinum analysis software, a cloud-based solution that automates data analysis workflows and visualizes the sequencing results.

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The company was founded in 2013 and is headquartered in Branford, Connecticut.

Stock analysis

QuantumSi Inc (QSI) currently trades at $1.16, while our model-based Fair Value estimate is $0.6460, 44.3% below the price, so the stock looks overvalued today.

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Valuation

How firm this estimate is: it rests on 1 models at a data quality of 96/100, which puts the data coverage at low.

Scenario range: $0.4250 (bear) to $0.8075 (bull), the price of $1.16 sits above it. Bear and bull are the same models on cautious and optimistic assumptions, a range, not a price target.

Quality & growth

The Quality Score stands at 24/100 (below-average quality), in the Healthcare sector.

Mixed Growth: Revenue is growing, but margins or cash flow do not fully confirm the trend.

QuantumSi Inc reported revenue of $2.4M in FY2025 versus $0 in FY2021. Reported net income was −$101M in FY2025.

Key figures

Market cap $253M Micro · EPS (TTM) $−0.4600 · Return on equity −49.1% · Return on assets (EBIT) −34.3% · Operating margin −7,450% · Revenue (TTM) $1.6M · Revenue growth (YoY) −41.8% · Free cash flow −$97.2M.

Competitive moat

Our AI-assisted moat analysis scores the competitive advantage at 5 out of 100 (low confidence).

What moves the price

The share trades about 55% below its 52-week high and 65% above its 52-week low, currently above its 200-day average.

For context, the median of 10 Healthcare peers we cover trades at 7% fair-value upside, at −44%, QSI screens richer than that median.

Fair Value models

Bear $0.4250 Fair Value $0.6460 Bull $0.8075
Price $1.16 · Upside -44.3%
Model ⓘEach model values the company its own way (discounted cash flow, earnings, assets, dividends). The fair value above starts from their evidence-weighted blend, not from a single model. In cyclical trough or peak years, after dilution or a stock split it is adjusted afterwards, so it can sit above or below the models. Bear ⓘBear = the cautious scenario: the same model computed with conservative anchors (lower growth, margins and valuation multiples). Together with Bull it frames a plausible valuation range, not a price target.BaseBull ⓘBull = the optimistic scenario: the same model computed with favourable anchors (higher growth, margins and valuation multiples). Together with Bear it frames a plausible valuation range, not a price target. If a model's bull case is above four times its base value, the table shows that limit with a > sign (like the overall Bull above): beyond it no assumption holds. Coverage ⓘCoverage = how well-backed THIS model's estimate is for this stock (0–100): how complete and reliable its input data are, and how well the model fits the company. The final Fair Value is an evidence-weighted blend, so better-evidenced models count more. Green ≥70, amber 50–69, grey below 50.
Best data coverage
NCAV (Graham) $0.5000 $0.7600 $0.9500 54
All 1 models by family
Asset-Based
NCAV (Graham) $0.5000 $0.7600 $0.9500 54

The fair value above starts from this blend and is adjusted for dilution from new shares.

Open the full fair value analysis →

Quality Score breakdown

Overall quality 24/100

It rates the business: profits, how they develop, real cash, balance sheet, investing and share count.

Profitability 0
How much profit the company makes from its sales and capital
Quality Growth 19
Are margins and returns getting better?
Cashflow 10
Do the profits arrive as real cash?
Financial strength 57
Debt, balance sheet and risk of trouble
Investment 67
Does it invest with discipline instead of growing at any price?
Low Volatility 0
How calm the share price moves, does not count
Momentum 54
Price trend of the last 3 to 12 months, does not count
Near the 52-week high 12
Distance to the 52-week high, does not count
New shares 0
Buys back shares or issues new ones?

Open the full quality analysis →

Revenue & earnings trend

Growth Quality ⓘGrowth is valuable only when reinvestment earns attractive returns (Aswath Damodaran): sustainable growth depends on return on capital, reinvestment and efficiency. Basis: total company revenue over the periods shown on the cards (3Y/5Y/all years), not per share, so a merger can show up as a growth jump; per-share earnings growth is in the value-creation card. 19/100
Revenue is growing, but margins or cash flow do not fully confirm the trend.
Revenue growth 1 year
−20.3%
Revenue growth 3 years ⓘMeasures the company's TOTAL revenue from reported annual statements: compound average growth per year (CAGR) from the fiscal year 3, 5 or N years back to the most recent comparable fiscal year. Not per share: buybacks do not change this number, and a merger can appear as a growth jump. Per-share growth (which does include buybacks) is in the value-creation card.
+74.4%
Profit margin (trend) ⓘOperating margin then vs now, from reported annual statements. A falling margin after a boom year is the classic peak-earnings signal: the growth rate then leans on an inflated base.
−26,980.6% (2022) → −3,996.7% (2025)
What shareholders gained per year ⓘWe only publish this rate when it is defensible. Reason: fiscal 2025 is a loss year, no rate is defined from a loss
not computed

QSI screens overvalued: fair value 44% below the price. Compare with Abbott Laboratories, →

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Peer GroupⓘHow this stock ranks against its industry: the green marker is this stock, the band is the typical 25–75% peer range, and the tick is the median.Medical Devices · 326 stocks

Beats the industry median on 2/6 measures
Overall it trails its industry peers.
Valuation
Quality Score 24 · Bottom 25%
Fair Value upside −44.3% · Below median
Profitability
Return on assets −41.3% · Bottom 25%
Growth and dividend
Revenue growth (quarter YoY) −41.8% · Bottom 25%
Balance sheet
Debt / equity 0.01× · Below median

Valuation Multiplesvs Medical Devices median · lower = cheaper

P/B 1.15× · Cheaper than median

Strength profile in five axes (Snowflake)

VALUEFUTUREPASTHEALTHDIVIDEND
This stock
VALUEFUTUREPASTHEALTHDIVIDEND
Sector peers
VALUE (fair-value potential)0 · sector 9
FUTURE (revenue growth)0 · sector 33
PAST (return on equity)0 · sector 16
HEALTH (low debt)100 · sector 98
DIVIDEND (yield)0 · sector 38

VALUE 0: the price sits above our fair-value range.

Context: sector, industry, market

Values & ESG

Does this company touch areas you may want to avoid? The classification is inferred from sector and industry.

None of the checked exposures detected

Similar stocks

10 more Medical Devices stocks, each showing price versus our Fair Value estimate.

Stock Price Fair Value vs Fair Value Compare
Stryker Corporation SYK $304.40 $334.84 +10% vs QSI
Boston Scientific Corporation BSX $43.00 $47.30 +10% vs QSI
DexCom, Inc DXCM $85.98 $94.58 +10% vs QSI
Shenzhen Mindray Bio-Medical Electronics Co 300760 ¥166.00 ¥182.60 +10% vs QSI
GE HealthCare Technologies Inc GEHC $65.74 $70.37 +7% vs QSI
Edwards Lifesciences Corporation EW $87.22 $81.94 −6% vs QSI
Siemens Healthineers AG SHL €41.44 €35.19 −15% vs QSI
Abbott Laboratories, ABT $102.45 $75.28 −27% vs QSI
Medtronic plc MDT $92.77 $65.61 −29% vs QSI
Koninklijke Philips N.V PHIA €22.18 €15.23 −31% vs QSI

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QuantumSi Inc · Fair Value
$0.6460 −44%Fair Value
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Cite: Fair Value Calculator (2026). "QuantumSi Inc Fair Value". https://www.fairvalue-calculator.com/stock/QSI

Frequently asked questions

Is QuantumSi Inc (QSI) overvalued or undervalued?
As of Oct 21, 2026, our model estimates a fair value of $0.6460 versus a price of $1.16, about −44% upside (overvalued).
What is the fair value of QSI?
Our model-based fair value for QuantumSi Inc is $0.6460 (as of Oct 21, 2026), built from audited fundamentals. The current price: $1.16.
What is the quality score of QSI?
QuantumSi Inc has a Quality Score of 24/100. It measures business quality (profitability, growth, cash flow, balance-sheet strength, investment discipline, share issuance). Market factors such as price momentum and volatility do not enter the number; they are shown separately in the detail view.
What is the price target for QuantumSi Inc (QSI)?
Our model-based price target is the fair value of $0.6460 (as of Oct 21, 2026) from 1 valuation models. Cautious scenario $0.4250, optimistic scenario $0.8075. It is a calculation from audited fundamentals, not an analyst target.
What is the QuantumSi Inc stock forecast for 2026?
Our models put fair value at $0.6460, about −44% upside versus a price of $1.16 (overvalued). Cautious scenario $0.4250, optimistic scenario $0.8075. The calculation is refreshed regularly with new filings.
What is the revenue of QuantumSi Inc (QSI)?
QuantumSi Inc reported trailing-twelve-month revenue of about $1.6M (latest available figure, as of Oct 21, 2026).
What is the intrinsic value of QuantumSi Inc (QSI)?
Intrinsic value and fair value mean the same thing: what the business is worth on its numbers, independent of the share price. For QuantumSi Inc it is $0.6460 per share (as of Oct 21, 2026), against a price of $1.16. It is the blended result of 1 valuation models (cash flow, earnings, asset, dividend).
Is QuantumSi Inc stock overvalued or undervalued in 2026?
As of Oct 21, 2026, QSI trades above its calculated fair value: price $1.16, fair value $0.6460, a gap of about −44% (overvalued). The calculation is refreshed with each new quarterly report, so the verdict can change during the year.
Is fair value the same as the market price of QSI?
No. The price is what the market pays today ($1.16); the fair value is what the company's own numbers justify ($0.6460). For QuantumSi Inc the two are $0.5140 per share apart. That gap is exactly why we show both numbers side by side.
How much is QuantumSi Inc worth?
The market values QuantumSi Inc at about $253M (market capitalisation, as of Oct 21, 2026). Per share that is $1.16; our models calculate a fair value of $0.6460 per share.
What do the bullish and bearish scenarios say about QSI?
Our models span a range for QuantumSi Inc: cautious scenario $0.4250, base $0.6460, optimistic $0.8075 per share (as of Oct 21, 2026, price $1.16). The range comes from different growth and margin assumptions, not from analyst opinions.
How solid is the balance sheet of QuantumSi Inc (QSI)?
Balance-sheet figures for QuantumSi Inc (as of Oct 21, 2026): return on equity −49.1%, debt of 0.01 per unit of equity. They feed the Quality Score of 24/100, which measures business quality independently of the share price.
How far is QSI from its 52-week high?
QuantumSi Inc trades at $1.16, about 55% below its 52-week high of $2.59 and 65% above the low of $0.7020 (as of Oct 20, 2026). Distance from the high says nothing about value: that is what the fair value of $0.6460 is for.
Which stocks are comparable to QuantumSi Inc?
From the same area (Healthcare) we also value Abbott Laboratories,, Stryker Corporation, Medtronic plc, Boston Scientific Corporation, among others. Each of them has its own fair-value calculation on this site using the same models, so the comparison is like for like.
Is QuantumSi Inc stock attractive at the current price?
The data as of Oct 21, 2026: price $1.16, calculated fair value $0.6460 (−44%), Quality Score 24/100, from 1 models. Whether that fits your horizon and risk tolerance is your call. We provide the calculation, not investment advice.
How is the fair value of QSI calculated?
We run QuantumSi Inc through 1 models from four families: discounted cash flow, earnings models, asset and balance-sheet models, and dividend models. Every model gets the same audited fundamentals; the result is the weighted average of $0.6460, with the spread shown as a cautious and an optimistic scenario.
Is it still worth investing in stocks now?
The global stock market currently sits 13.8 % above its aggregate fair value. QuantumSi Inc itself currently trades above fair value. An expensive market is no reason to stay out and no reason to buy everything at once: keep a broad savings plan running, buy single stocks only with money you can do without, and hold part of your money liquid while the market is high. The full picture including sectors is on is it worth investing now.
What is the share price of QuantumSi Inc (QSI)?
The closing price on Oct 20, 2026 was $1.16. Our model-based fair value is $0.6460, about −44% upside (overvalued). We carry closing prices from our data provider, not a live tick.
What should I pay attention to with QuantumSi Inc right now?
The price sits above even our optimistic bull case ($0.8075). The favourable scenario is already priced in. Weak quality (24/100) and above fair value at the same time, the margin of safety is missing on both counts. The large gap to fair value rests on thin data (low evidence): fewer applicable models and a shorter history. Read it with extra caution. A fairly wide model range ($0.4250 to $0.8075) leaves room in how you read the outcome.

Key figures of QuantumSi Inc

How large is the market capitalisation of QuantumSi Inc (QSI)?
The market capitalisation of QuantumSi Inc is $253M. The stock-market value of the whole company: share price times number of shares. It is what the market asks for the entire business today.
What are the earnings per share of QuantumSi Inc (QSI)?
Earnings per share at QuantumSi Inc are $−0.4600. Earnings per share over the last twelve months: total profit spread across every single share.
What is the return on equity of QuantumSi Inc (QSI)?
The return on equity (ROE) of QuantumSi Inc is −49.1% (last twelve months). Profit relative to shareholders' equity, how efficiently the company works with its owners' money.
What is the EBIT return on assets of QuantumSi Inc (QSI)?
On an EBIT basis the return on assets of QuantumSi Inc is −34.3% (avg 5y). Operating profit (EBIT) relative to everything the company owns, as a multi-year average. It describes the business model rather than one good or bad year.
What is the operating margin of QuantumSi Inc (QSI)?
The operating margin of QuantumSi Inc is −7,450% (last twelve months). Profit from the core business (before interest and taxes) relative to revenue.
How fast is revenue growing at QuantumSi Inc (QSI)?
Revenue at QuantumSi Inc is growing −41.8% versus a year earlier (3y avg +74.4%). How much revenue grew versus a year earlier (YoY). The 3-year average next to it puts the single year in context.
How much free cash flow does QuantumSi Inc (QSI) generate?
The free cash flow of QuantumSi Inc is −$97.2M (fiscal year 2025). The cash truly left after running and investing in the business, this is what pays dividends and buybacks.
How much net cash does QuantumSi Inc (QSI) hold?
QuantumSi Inc holds more cash than debt, $17.5M net (fiscal year 2025). The company holds more cash than debt, a safety cushion.
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