Q.S.ICo큐에스아이
066310 · KOSDAQ · ₩066310 · 큐에스아이
- Market cap
- ₩70B
- Enterprise value
- ₩55B
- P/E
- 10.9×
- P/B
- 0.8×
- Dividend yield
- 1.3%
- ROE
- 7.0%
- Net margin
- 24.9%
Trailing 12 months from filed financial statements, as of H1 2026. Dividend yield: the 2025 dividend per share from the annual report ÷ today's price.
52-week range−66.8% from the high
₩5,360Today: ₩7,440 – ₩7,670₩22,750
Returns
- 1W−0.7%
- 1M−8.8%
- 3M+30.8%
- 6M−50.2%
- YTD+1.8%
- 1Y+4.3%
- Volume today
- 33,471
- 0.5× the 20-day average
- Traded today
- ₩254M
- Listed shares
- 9,271,621
- EPS (12 months)
- ₩693
- Earnings yield 9.2%
Upcoming dates
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Signals
Quiet- BuzzQuietBuzz 35 of 100 (50 is a normal day for this stock).
- MomentumWeak-7.6% over the last month; the price is below its 20-day average.
Signals describe activity, not recommendations. Not financial advice.
Q.S.ICo stock overview
Q.S.ICo (큐에스아이, KRX: 066310) is listed on KOSDAQ, in the Semiconductors sector. The company manufactures and sells semiconductor lasers and optical semiconductor products, with laser diodes as its main product, and offers a total solution for customized semiconductor laser products. Its shares closed at ₩7,550 on Oct 28, 2026, up 1.62% on the day, giving it a market value of ₩70B.
Key facts
- Market cap
- ₩70B
- Sector
- Semiconductors
- Latest price change
- +1.62%
- As of
- Oct 28, 2026
- Main business
- The company manufactures and sells semiconductor lasers and optical semiconductor products, with laser diodes as its main product, and offers a total solution for customized semiconductor laser products.
Quick answers about Q.S.ICo
- What does Q.S.ICo do?
- The company manufactures and sells semiconductor lasers and optical semiconductor products, with laser diodes as its main product, and offers a total solution for customized semiconductor laser products. Its laser diodes are used in power tools, barcode scanners, laser printers, factory automation sensors, air-purifier particle sensors, medical devices, and 3D depth sensors, with customers including major global manufacturers such as Black&Decker, HP, Canon, Zebra, Sick, and Keyence. Its production is based in Cheonan, South Korea, and China (Weihai).
- What is the market cap of Q.S.ICo?
- The market capitalisation of Q.S.ICo was ₩70B at the close on Oct 28, 2026.
- Who are the largest shareholders of Q.S.ICo?
- According to the latest official filings, the largest reported holders are Samhwa Yanghaeng (32.70%, as of Jul 14, 2026); Korea Securities Finance (4.33%, as of Jul 9, 2026); Lee Sang-heon (0.11%, as of Mar 28, 2025).
- When is the next earnings report from Q.S.ICo?
- Korean companies rarely announce results dates in advance. Based on when Q.S.ICo filed the same report in past years, its next 3q results is expected between Nov 13, 2026 and Nov 14, 2026.
Company profile
The company manufactures and sells semiconductor lasers and optical semiconductor products, with laser diodes as its main product, and offers a total solution for customized semiconductor laser products. Its laser diodes are used in power tools, barcode scanners, laser printers, factory automation sensors, air-purifier particle sensors, medical devices, and 3D depth sensors, with customers including major global manufacturers such as Black&Decker, HP, Canon, Zebra, Sick, and Keyence. Its production is based in Cheonan, South Korea, and China (Weihai).
Written by AI from the company's latest annual report.
- Korean name
- 큐에스아이
- Sector
- Semiconductors
- CEO
- 이청대
- Founded
- Jul 2000
- Listed
- Nov 2006
- Listed shares
- 9,271,621
- Fiscal year ends
- Month 12
- Website
- www.qsilaser.com
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Recent filings
See all- Buyback trust contract signedSep 9, 2026
- Half-year report (Jun 2026)Aug 14, 2026
- 5%+ holding reportJul 14, 2026
- 5%+ holding reportJul 9, 2026
- Amended: Quarterly report (Mar 2026)Jul 2, 2026
Titles in Korean until English translations are added.
Also known as: Q.S.ICo / 큐에스아이 / 066310 / KRX:066310
Source: KRX statistical information