Q.S.I Co (066310) Fair Value & Analysis
Technology · KR · Market cap 63.8B KRW
Fair value as of: Jul 22, 2026
From 22 valuation models · updated 19 days ago
Share price +0.5% over the past month.
A solid business, but screening 38% overvalued on our models.
What matters now
- The price sits above even our optimistic bull case (5,983 KRW). The favourable scenario is already priced in.
- Solid but not exceptional quality (63/100) and above fair value, neither a clear bargain nor a standout compounder.
Price vs Fair Value (5 years)
White line = price, green steps = our fair value per fiscal year, dashed = 300-day average. As of Jul 22, 2026.
How to read this chart
60‑month range 5,448 KRW – 25,395 KRW · fair‑value band 3,590 KRW – 5,983 KRW · the 7,660 KRW price screens above the 4,787 KRW fair value. Green steps = our fair value per fiscal year (point-in-time, no hindsight). Dashed = 300-day average. As of Jul 22, 2026.
Analysis
Q.S.I Co (066310) currently trades at 7,660 KRW, while our model-based Fair Value estimate is 4,787 KRW, implying the stock looks roughly 37.5% overvalued today. The Quality Score stands at 63/100 (solid quality), in the Technology sector. Bear case: priced above our estimate, the market already discounts strong expectations. Bull case: above-average quality can justify a premium, the entry price still matters most (evidence: high).
Over the trailing twelve months, Q.S.I Co generated revenue of 22.9B KRW at a net margin of 13.7%. Revenue declined 22.5% year over year. It earns a return on equity of 215.4%. Fundamentals as of Jul 22, 2026
Our scenario range runs from 3,590 KRW (bear case) to 5,983 KRW (bull case); at 7,660 KRW, the current price sits above that range. Bear and bull are the same models run on conservative and optimistic assumptions (margins, growth, valuation multiples), so a plausible valuation range, not a price target. The share trades about 66% below its 52-week high and 18% above its 52-week low, currently below its 200-day average. For context, the median of 10 Technology peers we cover trades at -68% fair-value upside, at -38%, 066310 screens cheaper than that median.
Fair Value models
Each model estimates fair value its own way; the Fair Value above is the evidence-weighted blend. Evidence (0–100) measures how completely this model’s inputs are available: well-fed models carry more weight in the blend. The spread across models is intentional, each one stresses a different value driver; dividend models, for instance, come out structurally low when payout is small.
All 22 models by family
Widest divergence: Asset-Based (6,555 KRW) versus Earnings-Based (1,245 KRW). Highest evidence: Growth DCF (80).
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Key figures & financial health
More key figures
Figures from reported company fundamentals · as of Jul 22, 2026. TTM = trailing twelve months.
Quality Score breakdown
Of which business quality 62 · Market factors (momentum, volatility) 18
Non-valuation factor families (profitability, growth, cashflow, financial strength, momentum …), each academically grounded. Valuation itself sits in the Fair Value and is deliberately excluded here to avoid double-counting.
About the company
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.
Company description, as reported by the company or data provider.
Revenue & earnings trend
FY2021 – FY2025 · reported fiscal years
Q.S.I Co 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.
066310 screens 38% overvalued. Compare with TES Co →
Peer Group
Semiconductors & Semiconductor Equipment · 46 stocks
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.
Valuation Multiples vs Semiconductors & Semiconductor Equipment median · lower = cheaper
Snowflake
Five quick dimensions, each 0 to 100: VALUE (fair-value potential), FUTURE (revenue growth), PAST (return on equity), HEALTH (low debt), DIVIDEND (yield). Green = this stock, grey = typical sector peer.
VALUE 0: the price sits above our fair-value range.
Values & ESG
Does this company touch areas you may want to avoid? The classification is inferred from sector and industry.
ESG scores are not available for this stock yet. Values and ESG data are contextual and can differ between providers.
Similar stocks
10 more Semiconductors & Semiconductor Equipment stocks, each showing price versus our Fair Value estimate (as of Jul 22, 2026).
| Stock | Price | Fair Value | vs Fair Value |
|---|---|---|---|
| TES Co 095610 | 194,300 KRW | 48,953 KRW | -75% |
| Eugene Technology Co 084370 | 146,800 KRW | 38,128 KRW | -74% |
| TSE Co 131290 | 282,500 KRW | 69,101 KRW | -76% |
| ISC Co 095340 | 151,200 KRW | 46,504 KRW | -69% |
| PSK HOLDINGS Inc 031980 | 136,200 KRW | 69,242 KRW | -49% |
| Jeju Semiconductor Corp 080220 | 81,900 KRW | 23,473 KRW | -71% |
| Tokai Carbon Korea Co 064760 | 232,000 KRW | 112,596 KRW | -51% |
| HANA Micron Inc 067310 | 35,750 KRW | 11,501 KRW | -68% |
| RFHIC Corporation 218410 | 46,250 KRW | 20,781 KRW | -55% |
| S&S Tech Corporation 101490 | 39,600 KRW | 46,799 KRW | +18% |
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How we calculate Fair Value
Each company is valued through a stack of independent intrinsic-value models (DCF variants, residual-income, multiples and more), blended into one family-balanced consensus and weighted by how much trustworthy data backs it. A separate quality layer scores the fundamentals. Every input is real reported data, nothing guessed.
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