1. South Korea Stocks

  2. •

    Electronic technology

  3. •

    Semiconductors
QSI Co., Ltd.

QSI Co., Ltd.

KKRX:066310
7,410.00
KRW
-60.00
(-0.80%)
509.38EPS
20.87P/E
96.34BMarket Cap
2013 Y
2014 Y
2015 Y
2016 Y
2017 Y
2018 Y
2019 Y
2020 Y
2021 Y
2022 Y
2023 Y
2024 Y
2025 Y
TTM
Revenue per Share
3,093.72
2,926.82
3,092.55
2,669.74
2,740.28
2,343.75
2,813.95
2,709.56
3,487.22
2,451.85
2,026.15
2,363.89
2,609.85
2,649.73
Basic EPS, GAAP
449
385
168
172
91
-44
137
16
185
757
294
360
282
509.38
Free Cash Flow per Basic Share
105.96
195.83
251.69
-31.46
80.99
140.86
6.68
-867.85
575.69
351.71
295.33
59.15
349.79
268.8
Dividend per Share
- -
50.02
- -
50
- -
50.79
18.88
47.77
57.04
100.19
98.78
100.96
117.39
0.12
Book Value per Share
5,828.87
6,172.78
6,328.46
6,413.45
6,443.69
6,365.46
6,585.98
6,602.87
8,035.38
8,775.91
9,039.59
9,493.27
9,645.11
9,858.09
Tangible Book Value per Share
5,482.17
5,813.13
5,933.64
6,015.78
5,954.07
5,876.63
6,174.35
6,243.67
7,829.29
8,589.11
8,831.5
9,272.79
9,431.54
9,684.95
Basic Weighted Avg Shares
8
8
8
8
8
8
8
8
8
9
9
9
9
9
Sales/Revenue/Turnover
25,636
24,217
25,495
22,021
22,628
18,824
22,680
23,003
29,380
22,699
18,687
21,363
23,283
23,794
Operating Margin (%)
14.48
14.37
5.5
4.06
4.72
-5.6
1.84
1.87
9.21
8.13
-22.71
5.54
1.26
3.62
Depreciation Expense
1,871
1,913
2,295
2,544
2,669
2,495
2,460
2,179
3,096
2,791
2,629
2,724
2,426
2,400
Net Income, GAAP
3,721
3,186
1,385
1,419
751
-353
1,104
136
1,559
7,008
2,712
3,253
2,516
4,574
Effective Tax Rate (%)
11.33
15.69
13.13
11.4
- -
- -
- -
- -
39.83
18.57
- -
6.1
9.43
11.28
Profit Margin (%)
14.51
13.15
5.43
6.44
3.32
-1.88
4.87
0.59
5.31
30.87
14.51
15.23
10.81
19.22
Working Capital
27,094
29,870
29,310
29,853
25,707
20,686
24,977
13,298
29,235
27,700
27,351
34,904
36,288
37,061
LT Debt
- -
- -
- -
- -
- -
- -
215
557
553
427
359
324
250
270
Total Equity
48,253
51,007
52,203
52,773
52,565
51,481
54,492
54,631
73,896
81,265
82,475
83,943
87,412
89,342
Return on Invested Capital (%)
7.01
5.84
2.34
1.51
- -
- -
- -
- -
2.51
1.92
- -
1.33
0.31
0.87
Return on Capital (%)
7.99
6.4
2.69
2.7
- -
- -
- -
- -
3.57
8.99
- -
3.9
2.93
5.28
Return on Common Equity (%)
8.02
6.42
2.68
2.7
1.43
-0.68
2.08
0.25
2.43
9.03
3.31
3.91
2.94
5.29

Capital Structure

KRW

•

in mil. unless spec.
Sep'25
Dec'25
Mar'26
ST Debt
84
88
94
LT Borrowings
- -
- -
- -
LT Finance Leases
239
250
270
Preferred Equity and Hybrid Capital
- -
- -
- -
Shares Outstanding
9
9
9
Market Capitalization
72,672
67,246
96,338

Working Capital

KRW

•

in mil. unless spec.
Sep'25
Dec'25
Mar'26
Total Current Assets
37,002
40,460
42,513
Cash, Cash Equivalents & STI
22,621
26,930
27,425
Accounts Receivable, Net
4,154
4,176
5,257
Inventories
8,357
8,246
8,571
Total Current Liabilities
3,634
4,171
5,452
Payables & Accruals
- -
- -
- -
ST Debt
84
88
94
Deferred Revenue
- -
- -
- -

Growth Rates

KRW

•

in mil. unless spec.

(avg. rate of change)

10 years
5 years
1 year
Total Equity
5.74%
10.53%
4.13%
Free Cash Flow
-1,410.2%
37.66%
483.71%
Net Income, GAAP
64.13%
266.61%
-22.67%
Sales/Revenue/Turnover
0.48%
2.12%
8.98%
Total Cash Common Dividend
- -
24.93%
14.78%

Quarterly Revenue

KRW

•

in mil. unless spec.

Year

Q1
Q2
Q3
Q4
FY
2024
4,965
6,008
5,061
5,329
21,363
2025
5,633
5,723
5,892
6,035
23,283
2026
6,144
- -
- -
- -
- -

Quarterly Earnings Per Share

KRW

•

in mil. unless spec.

Year

Q1
Q2
Q3
Q4
FY
2024
181
31
36
113.34
360
2025
22
21.99
65.32
170.28
282
2026
248.44
- -
- -
- -
- -

Quarterly Dividends Per Share

KRW

•

in mil. unless spec.

Year

Q1
Q2
Q3
Q4
FY
2024
- -
- -
- -
- -
100.96
2025
- -
- -
-0.17
0.29
117.39
2026
- -
- -
- -
- -
- -

Company Description

Company Profile APIChatGPT
CEO
Cheong-Dae Lee
Full Time Employees
138
Sector
Electronic technology
Industry
Semiconductors
Address
Cheonan South Korea
IPO Date
Nov 24, 2006
Website
qsilaser.com
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Business
Q.S.I Co., Ltd. is a South Korea-based company specializing in the development, manufacturing, and sale of semiconductor laser diodes and optical semiconductor-related products. The company produces a range of laser diodes including red and infrared types utilized in power tools, barcode scanners, laser beam printers, optical pickup units for digital versatile discs (DVDs) and compact discs (CDs), as well as applications in medical equipment, sensors, lidar, and optical communications. It offers foundry services such as epitaxial wafer production, wafer foundry services, and packaging services. The company markets its products under the QSI Laser Diode brand and serves domestic and international customers, including major electronics firms like Fuji Xerox, Panasonic, and Samsung. Founded in 2000 and headquartered in Cheonan-si, South Korea, Q.S.I Co., Ltd. has established advanced manufacturing capabilities in compound semiconductors such as laser diodes, VCSELs, RF devices, and Micro LED technology. In the last couple of years, Q.S.I Co., Ltd. has reinforced its position by enhancing its manufacturing technology and capacity, focusing on providing comprehensive foundry and device manufacturing services. It has made operational improvements by investing in speed management and research and development to overcome import dependence on laser diodes and maintain competitiveness. The company continues to expand its product range and capabilities to serve various high-tech markets, with an emphasis on innovation in photonic semiconductor technology and advanced production systems that cover epitaxial, fabrication, and packaging processes. Q.S.I's recent strategic approach emphasizes maintaining strong client relationships with recognized electronics manufacturers while targeting broader international markets. This includes enhancing product designs and expanding foundry services to include VCSEL and Micro LED devices, positioning itself as a key player in the semiconductor laser diode segment within the Asia-Pacific region and globally. Overall, Q.S.I Co., Ltd. operates primarily in the semiconductor and photonics industry segments, addressing diverse end markets such as industrial, consumer electronics, medical, and communication sectors with a comprehensive portfolio of laser diode products and semiconductor manufacturing services. It maintains a technological edge by blending product innovation with foundry service excellence and expanding production capabilities since its inception in 2000.