Q.S.I (A066310) Stock Overview

Develops, manufactures, and sells red and infra-red laser diodes in South Korea and internationally. More details

A066310 fundamental analysis
Snowflake Score
Valuation	1/6
Future Growth	0/6
Past Performance	3/6
Financial Health	6/6
Dividends	1/6

Rewards

Price-To-Earnings ratio (21.6x) is below the Semiconductor industry average (24.3x)

Earnings grew by 154.6% over the past year

Risk Analysis

Highly volatile share price over the past 3 months compared to the KR market

Earnings have declined by 2.9% per year over past 5 years

Does not have a meaningful market cap (₩99B)

Large one-off items impacting financial results

A066310 Community Fair Values

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Q.S.I Co., LTD. Competitors

Price History & Performance

Summary of share price highs, lows and changes for Q.S.I
Historical stock prices
Current Share Price	₩11,160.00
52 Week High	₩22,750.00
52 Week Low	₩6,610.00
Beta	0.90
1 Month Change	-27.25%
3 Month Change	31.91%
1 Year Change	46.26%
3 Year Change	7.62%
5 Year Change	-29.59%
Change since IPO	-3.79%

Recent updates

Analysis Article • Nov 26

Q.S.I's (KOSDAQ:066310) Solid Earnings Are Supported By Other Strong Factors

Investors were underwhelmed by the solid earnings posted by Q.S.I Co., LTD. ( KOSDAQ:066310 ) recently. We have done...

Analysis Article • Mar 24

Why Q.S.I's (KOSDAQ:066310) Earnings Are Better Than They Seem

The market seemed underwhelmed by last week's earnings announcement from Q.S.I Co., LTD. ( KOSDAQ:066310 ) despite the...

Analysis Article • Dec 27

Subdued Growth No Barrier To Q.S.I Co., LTD. (KOSDAQ:066310) With Shares Advancing 26%

Q.S.I Co., LTD. ( KOSDAQ:066310 ) shares have had a really impressive month, gaining 26% after a shaky period...

Analysis Article • Nov 12

Q.S.I Co., LTD.'s (KOSDAQ:066310) Popularity With Investors Is Under Threat From Overpricing

Q.S.I Co., LTD.'s ( KOSDAQ:066310 ) price-to-sales (or "P/S") ratio of 2.8x may not look like an appealing investment...

Analysis Article • Mar 18

Q.S.I's (KOSDAQ:066310) Weak Earnings May Only Reveal A Part Of The Whole Picture

Investors were disappointed by Q.S.I Co., LTD.'s ( KOSDAQ:066310 ) latest earnings release. We did some analysis, and...

Analysis Article • Mar 30

There Are Reasons To Feel Uneasy About Q.S.I's (KOSDAQ:066310) Returns On Capital

To find a multi-bagger stock, what are the underlying trends we should look for in a business? Amongst other things...

Analysis Article • Feb 23

Is Q.S.I (KOSDAQ:066310) Using Too Much Debt?

Warren Buffett famously said, 'Volatility is far from synonymous with risk.' So it might be obvious that you need to...

Analysis Article • Jan 19

Is Quantum Semiconductor International's (KOSDAQ:066310) 197% Share Price Increase Well Justified?

When you buy a stock there is always a possibility that it could drop 100%. But when you pick a company that is really...

Analysis Article • Dec 15

Is Quantum Semiconductor International (KOSDAQ:066310) Set To Make A Turnaround?

What financial metrics can indicate to us that a company is maturing or even in decline? A business that's potentially...

Shareholder Returns

	A066310	KR Semiconductor	KR Market
7D	-20.3%	16.2%	6.7%
1Y	46.3%	778.3%	195.0%

Return vs Industry: A066310 underperformed the KR Semiconductor industry which returned 778.3% over the past year.

Return vs Market: A066310 underperformed the KR Market which returned 195% over the past year.

Price Volatility

Is A066310's price volatile compared to industry and market?
A066310 volatility
A066310 Average Weekly Movement	17.9%
Semiconductor Industry Average Movement	13.8%
Market Average Movement	9.5%
10% most volatile stocks in KR Market	16.6%
10% least volatile stocks in KR Market	4.9%

Stable Share Price: A066310's share price has been volatile over the past 3 months compared to the KR market.

Volatility Over Time: A066310's weekly volatility has increased from 11% to 18% over the past year.

About the Company

Founded	Employees	CEO	Website
2000	105	Cheong-Dae Lee	www.qsilaser.com

Q.S.I Co., LTD. develops, manufactures, and sells red and infra-red laser diodes in South Korea and internationally. The company also provides foundry services, that includes Epi wafers, wafer foundry services, and package services.

Q.S.I Co., LTD. Fundamentals Summary

How do Q.S.I's earnings and revenue compare to its market cap?
A066310 fundamental statistics
Market cap	₩98.68b
Earnings (TTM)	₩4.57b
Revenue (TTM)	₩23.79b

21.6x

P/E Ratio

4.1x

P/S Ratio

Is A066310 overvalued?

See Fair Value and valuation analysis

Earnings & Revenue

Key profitability statistics from the latest earnings report (TTM)
A066310 income statement (TTM)
Revenue	₩23.79b
Cost of Revenue	₩18.04b
Gross Profit	₩5.75b
Other Expenses	₩1.18b
Earnings	₩4.57b

Last Reported Earnings

Mar 31, 2026

Next Earnings Date

n/a

Earnings per share (EPS)	517.29
Gross Margin	24.17%
Net Profit Margin	19.22%
Debt/Equity Ratio	0%

How did A066310 perform over the long term?

See historical performance and comparison

Dividends

0.9%

Current Dividend Yield

n/a

Payout Ratio

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2026/06/01 16:48
End of Day Share Price	2026/06/01 00:00
Earnings	2026/03/31
Annual Earnings	2025/12/31

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

^* Example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more.

Analysis Model and Snowflake

Details of the analysis model used to generate this report is available on our Github page, we also have guides on how to use our reports and tutorials on Youtube.

Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on Github.

Analyst Sources

Q.S.I Co., LTD. is covered by 1 analysts. 0 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

Analyst	Institution
Seung Wook Lee	SK Securities Co., Ltd.

Q.S.I (A066310) Stock Overview

Rewards

Risk Analysis

Q.S.I Co., LTD. Competitors

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Vissem Electronics

Uniquest

Wavice

Price History & Performance

Recent News & Updates

Investor sentiment deteriorates as stock falls 17%

Investor sentiment improves as stock rises 20%

Investor sentiment improves as stock rises 19%

Full year 2025 earnings released: EPS: ₩282 (vs ₩360 in FY 2024)

Investor sentiment deteriorates as stock falls 16%

Q.S.I Co., LTD., Annual General Meeting, Mar 24, 2026

Recent updates

Investor sentiment deteriorates as stock falls 17%

Investor sentiment improves as stock rises 20%

Investor sentiment improves as stock rises 19%

Full year 2025 earnings released: EPS: ₩282 (vs ₩360 in FY 2024)

Investor sentiment deteriorates as stock falls 16%

Q.S.I Co., LTD., Annual General Meeting, Mar 24, 2026

Upcoming dividend of ₩100.00 per share

Q.S.I's (KOSDAQ:066310) Solid Earnings Are Supported By Other Strong Factors

Dividend of ₩100.00 announced

Q.S.I Co., LTD. announces Annual dividend, payable on April 10, 2026

New minor risk - Share price stability

Investor sentiment improves as stock rises 22%

New minor risk - Earnings quality

Why Q.S.I's (KOSDAQ:066310) Earnings Are Better Than They Seem

Full year 2024 earnings released: EPS: ₩360 (vs ₩294 in FY 2023)

Q.S.I Co., LTD., Annual General Meeting, Mar 25, 2025

Investor sentiment deteriorates as stock falls 26%

Subdued Growth No Barrier To Q.S.I Co., LTD. (KOSDAQ:066310) With Shares Advancing 26%

New minor risk - Share price stability

Upcoming dividend of ₩100.00 per share

Investor sentiment improves as stock rises 18%

Q.S.I Co., LTD. (KOSDAQ:A066310) announces an Equity Buyback for KRW 1,500 million worth of its shares.

Q.S.I Co., LTD.'s (KOSDAQ:066310) Popularity With Investors Is Under Threat From Overpricing

New major risk - Dividend sustainability

Q.S.I Co., LTD. (KOSDAQ:A066310) announces an Equity Buyback for KRW 1,000 million worth of its shares.

Q.S.I Co., LTD. (KOSDAQ:A066310) announces an Equity Buyback for KRW 500 million worth of its shares.

Q.S.I's (KOSDAQ:066310) Weak Earnings May Only Reveal A Part Of The Whole Picture

Full year 2023 earnings released: EPS: ₩294 (vs ₩757 in FY 2022)

Upcoming dividend of ₩100.00 per share at 1.1% yield

Third quarter 2023 earnings released: ₩229 loss per share (vs ₩190 profit in 3Q 2022)

Q.S.I Co., LTD. (KOSDAQ:A066310) announces an Equity Buyback for KRW 1,000 million worth of its shares.

Full year 2022 earnings released: EPS: ₩757 (vs ₩185 in FY 2021)

Upcoming dividend of ₩100.00 per share

No independent directors

Now 20% undervalued after recent price drop

Now 24% undervalued after recent price drop

Investor sentiment deteriorated over the past week

Now 24% undervalued after recent price drop

Now 21% undervalued after recent price drop

Investor sentiment improved over the past week

Investor sentiment deteriorated over the past week

No independent directors

Full year 2021 earnings: Revenues and EPS in line with analyst expectations

Investor sentiment improved over the past week

Upcoming dividend of ₩50.00 per share

Investor sentiment improved over the past week

There Are Reasons To Feel Uneasy About Q.S.I's (KOSDAQ:066310) Returns On Capital

Is Q.S.I (KOSDAQ:066310) Using Too Much Debt?

Q.S.I Co., LTD., Annual General Meeting, Mar 19, 2021

New 90-day high: ₩20,200

Is Quantum Semiconductor International's (KOSDAQ:066310) 197% Share Price Increase Well Justified?

New 90-day high: ₩18,000

Upcoming Dividend of ₩50.00 Per Share

Is Quantum Semiconductor International (KOSDAQ:066310) Set To Make A Turnaround?

New 90-day high: ₩17,750

Quantum Semiconductor International Co., Ltd. announced that it has received KRW 13.9999569 billion in funding from NH Investment & Securities Co., Ltd., Investment Arm, DB Financial Investment Co.,Ltd., Investment Arm, Evest Investment Securities Co., Ltd. and other investors

Quantum Semiconductor International Co., Ltd. announced that it expects to receive KRW 13.9999569 billion in funding from NH Investment & Securities Co., Ltd., Investment Arm, DB Financial Investment Co.,Ltd., Investment Arm, Evest Investment Securities Co., Ltd. and other investors

Shareholder Returns

Price Volatility

About the Company

Q.S.I Co., LTD. Fundamentals Summary

Earnings & Revenue

Dividends