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QSI is a compound semiconductor specialist headquartered in Cheonan, Chungnam Province, whose core business is manufacturing and selling finished laser diode (LD) products.

For VCSEL, RF devices (MMIC), and Micro LED, the company operates an epi-foundry and device fabrication service model rather than selling finished goods.

Its main LD products are used in barcode scanners, laser beam printers (LBP), and industrial sensors, and the company has also expanded into high-power pulsed semiconductor laser diodes for autonomous vehicle and industrial LiDAR applications.

On the new-business front, QSI is developing InP HEMT-based ultra-high-frequency RF semiconductors and a red Micro LED epi platform, and last year co-developed cryogenic next-generation semiconductor devices with Kyungpook National University, which is backed by Samsung Electronics.

Its customer base spans domestic and overseas markets, with the company describing a global customer group across industrial sensors, robotics, and printer applications.

On the ownership side, controlling shareholder Samhwa Yanghang strengthened its grip in August 2025 by acquiring treasury shares, raising the combined stake of the largest shareholder and related parties from 28.82% to 32.69%.

However, the traditional LD- and sensor-centered business has struggled to grow, leaving overall revenue stuck in the low-20-billion-won range for several years, a situation the company is now attempting to overcome through new-business investment.

Annual consolidated revenue fell from 22.7 billion won in 2022 to 18.7 billion won in 2023, then recovered to 21.4 billion won in 2024 and 23.3 billion won in 2025.

Operating profit, however, was far more volatile: the 1.85 billion won operating profit in 2022 turned into a 4.24 billion won operating loss in 2023, rebounded to 1.18 billion won in 2024, and then shrank sharply again to just 294 million won in 2025.

Net income attributable to owners moved from 7.01 billion won in 2022 to 2.71 billion won in 2023, 3.25 billion won in 2024, and 2.52 billion won in 2025—a milder but still generally declining trend compared with operating profit.

On a quarterly basis, revenue rose steadily from 5.72 billion won in Q2 2025 to 5.89 billion won in Q3, then 6.03 billion won in Q4, while net income expanded markedly toward year-end, reaching 1.94 billion won, then 585 million won, then 1.54 billion won respectively alongside operating profit of 15 million won, 216 million won, and 96 million won.

In Q1 2026, both operating profit (534 million won) and net income (2.25 billion won) improved clearly on revenue of 6.14 billion won, while in Q2 2026 revenue climbed further to 7.70 billion won—the largest of the recent four quarters—yet operating profit slipped back to a loss of 12.5 million won.

Net income in that same quarter, however, came in at 2.05 billion won, moving in the opposite direction from the operating loss, suggesting non-operating factors played a substantial role in the quarter's bottom line.

Over the trailing four quarters from Q3 2025 through Q2 2026, net income attributable to owners totaled roughly 6.43 billion won, exceeding levels seen in several recent full fiscal years.

The compound and photonic semiconductor industry spans multiple applications—laser diodes, VCSEL, RF devices, and Micro LED—so QSI's fortunes are shaped by overlapping demand from several end markets rather than a single downstream cycle.

Interest in photonic semiconductors has reportedly grown alongside data center and AI infrastructure expansion, with Nvidia's CEO citing optical semiconductors as a key technology for future AI infrastructure.

In quantum computing hardware, demand continues for low-noise, high-frequency devices that operate in cryogenic environments, and QSI has unveiled an InGaAs-based high-electron-mobility transistor (HEMT) claimed to achieve world-leading 813GHz performance in this space.

That said, these emerging technology areas do not yet appear to have reached mass-production or meaningful revenue-generation stages, and their contribution to overall sales is estimated to remain limited.

Competitively, few domestic producers directly manufacture laser diodes, giving QSI a niche position, but in newer areas such as VCSEL, RF semiconductors, and Micro LED it must compete against larger overseas compound-semiconductor and photonics companies.

As a small company with revenue still in the low-20-billion-won range, QSI's earnings trajectory is likely to be driven more by the commercialization success of individual new businesses than by broader industry cycles.

In February 2026, the company began offering an InP multi-project wafer (MPW) service and free process design kit (PDK) distribution, positioning the move as an effort to energize the domestic high-frequency semiconductor ecosystem.

Around the same period, media reports indicated the company had launched R&D in RF semiconductors and Micro LED to break out of a revenue plateau in the low-20-billion-won range that has persisted around its laser-diode-centered business.

In March 2026, QSI announced it had co-developed, together with Kyungpook National University, an InGaAs-based HEMT device operating in cryogenic conditions with a claimed 813GHz performance level, expanding its cryogenic semiconductor technology base for applications such as quantum computing, aerospace, and ultra-sensitive sensors.

At its March 2026 annual general meeting, the company approved a cash dividend of 100 won per common share, totaling roughly 906 million won, along with a new executive retirement benefit regulation, reaffirming a shareholder-return policy maintained for nine consecutive years since 2017.

In the first quarter of 2026, rising demand for sensor and laser beam printer (LBP) product lines and expanded supply to global customers appear to have contributed to revenue growth and a return to operating profit through cost efficiencies.

However, since operating profit swung back into a loss in the second quarter despite continued revenue growth, the balance between ongoing new-business R&D spending and cost pressures—along with how quickly new businesses translate into actual revenue—are likely to remain key points to watch.