Q.S.I Co. LTD (066310) fair value: what the stock is really worth
As of Nov 9, 2026: fair value (intrinsic value) of Q.S.I Co. LTD stock KRW 4,441, price KRW 7,540, that is 41.1% below the price, quality 62 out of 100. Rating: strongly overvalued. Calculated from audited financials with 24 of our 26 valuation models and 37 quality factors, updated daily.
69 individual criteria per stock, every one traceableSee the method →
Price vs Fair Value
White line = price, green steps = our fair value per fiscal year. As of Nov 9, 2026.
How to read this chart
60‑month range 5,448 KRW – 25,395 KRW · fair‑value band 3,630 KRW – 5,338 KRW · the 7,540 KRW price screens above the 4,441 KRW fair value. Green steps = our fair value per fiscal year (point-in-time, no hindsight). As of Nov 9, 2026.
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Q.S.I Co., LTD. develops, manufactures, and sells red and infra-red laser diodes in South Korea and internationally. The company was founded in 2000 and is based in Cheonan-si, South Korea.
Stock analysis
Q.S.I Co. LTD (066310) currently trades at 7,540 KRW, while our model-based Fair Value estimate is 4,441 KRW, 41% below the price, so the stock looks overvalued today.
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Valuation
Bull case: the Growth Earnings group reads highest at a median of 5,908 KRW per share, and 2 of the 24 models we run sit above the 7,540 KRW price.
Bear case: the Dividend Discount group reads lowest at 839.17 KRW, and 22 of the 24 models stay below the price. Data coverage for this calculation is medium.
Scenario range: 3,630 KRW (bear) to 5,338 KRW (bull), the price of 7,540 KRW 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 62/100 (solid quality), in the Technology sector.
Weak Growth: Revenue growth is weak: less than 2 % a year.
Q.S.I Co. LTD reported revenue of 23.3B KRW in FY2025 versus 29.4B KRW in FY2021, a compound −5.6%/yr. Reported net income was 2.5B KRW in FY2025, compounding +12.7%/yr from FY2021.
Key figures
Market cap 68.6B KRW (≈ $50.7M) Micro · P/S ratio 2.96 · Dividend yield 1.4% · Net margin 13.7% · Return on equity 215% · Return on assets (EBIT) −0.2% (5-year average) · Operating margin 6.2% · Revenue (TTM) 22.9B KRW.
Competitive moat
Our AI-assisted moat analysis scores the competitive advantage at 54 out of 100 (low confidence).
What moves the price
The share trades about 58% below its 52-week high and 31% above its 52-week low, currently below its 200-day average.
For context, the median of 10 Technology peers we cover trades at 1% fair-value upside, at −41%, 066310 screens richer than that median.
Fair Value models
Bear3,630 KRWFair Value 4,441 KRWBull5,338 KRW
Price 7,540 KRW · Downside -41.1%
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.
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.40/100
Revenue growth is weak: less than 2 % a year.
Revenue growth 1 year
+9.0%
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.
+0.8%
Revenue growth 5 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.
+0.2%
Start year 2020 (pandemic). Over 10 years: −0.9% a year
Revenue growth 16 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.
+0.7%
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What shareholders gained per year (last 5 years), in KRW ⓘWhat the business itself delivers per year: earnings growth per share plus the dividend yield. This is what you get IF the market keeps valuing the stock the same way: it contains no assumption about the market changing its mind. Computed per share, so buybacks count and a merger does not pass as growth. For a company that pays no dividend it is pure earnings growth per share. Period: earnings growth per share as CAGR over the last 5 reported fiscal years (annual statements), plus the current dividend yield. The start value is the median of the three years around the start, so a single crisis year (a pandemic or a write-down) does not distort the rate. Measured in KRW: this currency has depreciated against the euro and dollar over the long run, so part of the nominal rate is currency erosion that never reaches a EUR/USD investor.
+17.1%
Earnings growth per share plus dividend.
Earnings per share, growth per year+15.7%
Dividend (yield on the price)1.4%
Pace: 5 vs 10 years ⓘTwo data points, not a trend model: earnings growth per share over the last 5 fiscal years against the last 10. Labelled "steady" when both rates are within 3 percentage points of each other, otherwise picking up or flattening. Shown only when ten years of history exist.15.7% vs 4.8%, picking up
Profit margin 2020 to 2025 ⓘ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.2% → 1%
Pace: the 5-year rate starts in 2020 (pandemic)
⚠ Revenue per share shrinking 1.5%/yr over ~7Y (margins eroding too) ⓘStructural-decline marker: revenue PER SHARE has fallen over the last decade (robust median trend, not a single year). Backtested across 2005 to 2017, such businesses trailed the market by about 2.5 percentage points per year. Display only: it does not change the fair value or the quality score.
Growth Forecast
A lot of optimism in the price
The price assumes more growth than the company has delivered so far.
What the price assumes ⓘThis turns our valuation around: instead of asking what the share is worth, it asks what growth the current price requires. It uses the cash the company keeps after all spending (free cash flow), the same discount rate as our models, five years of growth, then slowing evenly to 2 % a year by year ten. Compared with the analysts' sales forecasts extended to the same five years (at least three analysts, for context only, it does not enter the Fair Value): within 3 percentage points counts as "in line" (amber), below that little optimism (green), above that a lot of optimism (red).
+15.9%
Yearly growth needed for the next five years to justify today's price.
What forecasts expect
n/a
No analyst forecast available.
After inflation (South Korea: IMF forecast 2.1% a year to 2030, 2.1% from 2016 to 2025) that is about +13.6% a year for the price.
Price, fair value, quality and upside side by side.
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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.Semiconductors & Semiconductor Equipment · 49 stocks
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Is Q.S.I Co. LTD (066310) overvalued or undervalued?
As of Nov 9, 2026, our model estimates a fair value of 4,441 KRW versus a price of 7,540 KRW, about 41% lower (overvalued).
What is the fair value of 066310?
Our model-based fair value for Q.S.I Co. LTD is 4,441 KRW (as of Nov 9, 2026), built from audited fundamentals. The current price: 7,540 KRW.
What is the quality score of 066310?
Q.S.I Co. LTD has a Quality Score of 62/100. 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 Q.S.I Co. LTD (066310)?
Our model-based price target is the fair value of 4,441 KRW (as of Nov 9, 2026) from 24 valuation models. Cautious scenario 3,630 KRW, optimistic scenario 5,338 KRW. It is a calculation from audited fundamentals, not an analyst target.
What is the Q.S.I Co. LTD stock forecast for 2026?
Our models put fair value at 4,441 KRW, about 41% lower versus a price of 7,540 KRW (overvalued). Cautious scenario 3,630 KRW, optimistic scenario 5,338 KRW. The calculation is refreshed regularly with new filings.
What is the revenue of Q.S.I Co. LTD (066310)?
Q.S.I Co. LTD reported trailing-twelve-month revenue of about 22.9B KRW (latest available figure, as of Nov 9, 2026).
Does Q.S.I Co. LTD pay a dividend?
Q.S.I Co. LTD currently shows a dividend yield of 1.36% relative to its recent price (as of Nov 9, 2026).
How much is the dividend of Q.S.I Co. LTD (066310)?
Q.S.I Co. LTD has a dividend yield of 1.4%. A dividend has been paid every year since 2017. Our assessment: Safety not assessed. Payout ratio and cash coverage are not available, so we do not judge how safe this dividend is.
What growth is priced into Q.S.I Co. LTD (066310)?
For today's price to be fair in a discounted-cash-flow model, Q.S.I Co. LTD would have to grow free cash flow by +15.9 % per year for five years (discount rate 14.4 %, then slowing evenly to 2 % perpetual growth by year ten). Over the last 5 years revenue grew +0.2 % per year. As of Nov 9, 2026.
What discount rate (WACC) does the fair value of 066310 use?
Our models discount Q.S.I Co. LTD at 14.4 %: a base by market capitalisation (micro), damped by beta 1.38, country premium for South Korea. The same rate applies in all 26 models.
What is a reverse DCF?
A reverse DCF turns the usual calculation around. Instead of deriving a value from assumptions, it takes today's price as given and asks: what free-cash-flow growth would a company have to deliver for exactly this price to be fair? The result is not a forecast but the expectation already priced in. For Q.S.I Co. LTD that is +15.9 % per year for five years, then slowing evenly to 2 % by year ten, using the same discount rate (14.4 %) and the same formula as our fair value.
How much growth has Q.S.I Co. LTD (066310) delivered so far?
Over the past 5 years revenue at Q.S.I Co. LTD grew +0.2 % a year. The price currently implies free-cash-flow growth of +15.9 % per year. Comparing the two shows how much confidence is in the price: if it demands more than has been delivered, the business has to accelerate for the maths to work.
How fast is the sector of Q.S.I Co. LTD (066310) growing?
The median revenue growth in the sector is +11.5 % a year. That is the yardstick for the growth priced into Q.S.I Co. LTD (+15.9 % per year): it shows whether the expectation is within the usual range or beyond it.
What is the free cash flow yield of Q.S.I Co. LTD (066310)?
The free-cash-flow yield on the price is 4.55 %: that much free cash flow Q.S.I Co. LTD produces per unit of market value. When it exceeds the discount rate of our models (14.4 %), the business already earns more than its cost of capital demands, and the price needs little additional growth.
What is the intrinsic value of Q.S.I Co. LTD (066310)?
Intrinsic value and fair value mean the same thing: what the business is worth on its numbers, independent of the share price. For Q.S.I Co. LTD it is 4,441 KRW per share (as of Nov 9, 2026), against a price of 7,540 KRW. It is the blended result of 24 valuation models in 8 families (DCF Models, Earnings-Based, Dividend Discount, Multiples, Asset-Based, Growth DCF, Economic Profit, Growth Earnings).
Is Q.S.I Co. LTD stock overvalued or undervalued in 2026?
As of Nov 9, 2026, 066310 trades above its calculated fair value: price 7,540 KRW, fair value 4,441 KRW, a gap of about −41% (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 066310?
No. The price is what the market pays today (7,540 KRW); the fair value is what the company's own numbers justify (4,441 KRW). For Q.S.I Co. LTD the two are 3,099 KRW per share apart. That gap is exactly why we show both numbers side by side.
How much is Q.S.I Co. LTD worth?
The market values Q.S.I Co. LTD at about 68.6B KRW (market capitalisation, as of Nov 9, 2026). Per share that is 7,540 KRW; our models calculate a fair value of 4,441 KRW per share.
What do the bullish and bearish scenarios say about 066310?
Our models span a range for Q.S.I Co. LTD: cautious scenario 3,630 KRW, base 4,441 KRW, optimistic 5,338 KRW per share (as of Nov 9, 2026, price 7,540 KRW). The range comes from different growth and margin assumptions, not from analyst opinions.
How solid is the balance sheet of Q.S.I Co. LTD (066310)?
Balance-sheet figures for Q.S.I Co. LTD (as of Nov 9, 2026): return on equity 215.4%, debt of 0.09 per unit of equity. They feed the Quality Score of 62/100, which measures business quality independently of the share price.
How far is 066310 from its 52-week high?
Q.S.I Co. LTD trades at 7,540 KRW, about 58% below its 52-week high of 17,870 KRW and 31% above the low of 5,770 KRW (as of Nov 9, 2026). Distance from the high says nothing about value: that is what the fair value of 4,441 KRW is for.
Which stocks are comparable to Q.S.I Co. LTD?
From the same area (Technology) we also value JUSUNG ENGINEERING Co, PSK HOLDINGS Inc, ISC Co, TSE Co, 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 Q.S.I Co. LTD stock attractive at the current price?
The data as of Nov 9, 2026: price 7,540 KRW, calculated fair value 4,441 KRW (−41%), Quality Score 62/100, from 24 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 066310 calculated?
We run Q.S.I Co. LTD through 24 models from 8 families: DCF Models, Earnings-Based, Dividend Discount, Multiples, Asset-Based, Growth DCF, Economic Profit, Growth Earnings. Every model gets the same audited fundamentals; the fair value of 4,441 KRW builds on their evidence-weighted average, 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 13.3% above its aggregate fair value. Q.S.I Co. LTD 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 Q.S.I Co. LTD (066310)?
The closing price on Nov 9, 2026 was 7,540 KRW. Our model-based fair value is 4,441 KRW, about 41% lower (overvalued). We carry closing prices from our data provider, not a live tick.
What should I pay attention to with Q.S.I Co. LTD right now?
The price sits above even our optimistic bull case (5,338 KRW). The favourable scenario is already priced in. Solid but not exceptional quality (62/100) and above fair value, neither a clear bargain nor a standout compounder.
Key figures of Q.S.I Co. LTD
How large is the market capitalisation of Q.S.I Co. LTD (066310)?
The market capitalisation of Q.S.I Co. LTD is 68.6B KRW (≈ $50.7M). 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 is the P/S ratio of Q.S.I Co. LTD (066310)?
The price-to-sales ratio of Q.S.I Co. LTD is 2.96 (last twelve months). Price to sales: market value relative to yearly revenue. Useful when profit is thin or distorted.
What is the dividend yield of Q.S.I Co. LTD (066310)?
The dividend yield of Q.S.I Co. LTD is 1.4%. Yearly dividend relative to the share price. 3% pays 3 per 100 invested. Below: how much of profit is used for it.
What is the net margin of Q.S.I Co. LTD (066310)?
The net margin of Q.S.I Co. LTD is 13.7% (last twelve months). How much of every unit of revenue ends up as profit. 10% means 10 cents of profit per dollar of sales.
What is the return on equity of Q.S.I Co. LTD (066310)?
The return on equity (ROE) of Q.S.I Co. LTD is 215% (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 Q.S.I Co. LTD (066310)?
On an EBIT basis the return on assets of Q.S.I Co. LTD is −0.2% (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 Q.S.I Co. LTD (066310)?
The operating margin of Q.S.I Co. LTD is 6.2% (last twelve months). Profit from the core business (before interest and taxes) relative to revenue.
How fast is revenue growing at Q.S.I Co. LTD (066310)?
Revenue at Q.S.I Co. LTD is growing −22.5% versus a year earlier (3y avg +0.8%). How much revenue grew versus a year earlier (YoY). The 3-year average next to it puts the single year in context.
How fast are earnings growing at Q.S.I Co. LTD (066310)?
Earnings per share at Q.S.I Co. LTD are growing +31.9% versus a year earlier. How much earnings per share grew versus a year earlier.
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Some data
Nov 9, 2026