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Q
066310
vs
K
KOSPI 200
Over the past 12 months, QSI Co Ltd has underperformed KOSPI 200, delivering a return of +4% compared to KOSPI 200's +112% growth.
Stocks Performance
066310 vs KOSPI 200
Performance Gap
066310 vs KOSPI 200
Performance By Year
066310 vs KOSPI 200
Compare the stock's returns with its benchmark index and competitors. Gain insights into its relative performance over time.
QSI Co Ltd
Glance View
QSI Co Ltd, also known as QSI, makes semiconductor laser diodes. These are tiny light sources used in products such as optical sensors, laser modules, scanners, and other electronics that need a precise beam of light. The company sells these components to device makers and industrial customers that build them into finished products. Its business is mainly based on manufacturing and selling laser diode chips and related parts, along with custom device development for specific customer needs. QSI earns money when customers buy these components in volume, and in some cases through engineering work tied to product design and qualification. That makes it a parts supplier rather than a consumer brand. What sets QSI apart is that it sits deep in the electronics supply chain, where small component quality matters a lot. Customers care about wavelength accuracy, durability, and consistent performance, so QSI competes on technical know-how and manufacturing precision rather than on marketing or retail reach.