Q.S.I Co., LTD. (KOSDAQ:066310)

Revenue by Segment

Financials in millions KRW. Fiscal year is January - December.

Fiscal Year	FY 2025	FY 2024	FY 2023	FY 2022	FY 2021	FY 2020	FY 2019	FY 2018	FY 2017	FY 2016
Period Ending	Dec 31, 2025	Dec 31, 2024	Dec 31, 2023	Dec 31, 2022	Dec 31, 2021	Dec 31, 2020	Dec 31, 2019	Dec 31, 2018	Dec 31, 2017	Dec 31, 2016
Optical Semiconductor Business			18.69B	22.70B	29.38B	23.00B	22.68B
Optical Semiconductor Business Growth			-17.68%	-22.74%	27.72%	1.43%	20.48%
Total			18.69B	22.70B	29.38B	23.00B	22.68B
Total Growth			-17.68%	-22.74%	27.72%	1.43%	20.48%

Revenue by Geography

Financials in millions KRW. Fiscal year is January - December.

Fiscal Year	FY 2025	FY 2024	FY 2023	FY 2022	FY 2021	FY 2020	FY 2019	FY 2018	FY 2017	FY 2016
Period Ending	Dec 31, 2025	Dec 31, 2024	Dec 31, 2023	Dec 31, 2022	Dec 31, 2021	Dec 31, 2020	Dec 31, 2019	Dec 31, 2018	Dec 31, 2017	Dec 31, 2016
South Korea			2.10B	3.18B	7.84B	3.87B	3.01B
South Korea Growth			-33.98%	-59.37%	102.37%	28.56%	-4.40%
United States of America			1.48B	2.10B	4.10B	4.20B	3.55B
United States of America Growth			-29.41%	-48.82%	-2.37%	18.20%	165.96%
China			11.75B	13.94B	14.09B	12.87B	13.70B
China Growth			-15.70%	-1.08%	9.49%	-6.07%	23.91%
Europe			2.89B	2.84B	2.82B	1.84B	2.10B
Europe Growth			1.70%	0.97%	53.13%	-12.49%	-8.34%
Other			463.41M	636.26M	534.71M	221.72M	311.02M
Other Growth			-27.17%	18.99%	141.17%	-28.71%	-68.48%
Total			18.69B	22.70B	29.38B	23.00B	22.68B
Total Growth			-17.68%	-22.74%	27.72%	1.43%	20.48%

Data Source: S&P Global Market Intelligence Last updated: Mar 31, 2026

Financial data is provided by S&P Global Market Intelligence and updates within hours after each earnings release, which is every three months for this company.

Update frequency:

Quarterly

Last checked:

Jul 19, 2026

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