PER, EPS, PBR and BPS are calculated in-house from the last 4 quarters (2025Q3–2026Q2) · Dividend yield is based on ₩0 per share · Prices as of the 2026-10-02 close
Sigetronics is expanding into optical sensors, power semiconductors, and defense-grade devices, but operating losses have widened for four consecutive years through 2025, and a profitability turnaround has yet to show up in the reported numbers.
2025 revenue was KRW 12.75 billion with an operating loss of KRW 7.59 billion, wider than the prior year's KRW 6.29 billion loss.
Net losses stayed in the KRW 2 billion range in both Q1 and Q2 2026, bringing the trailing four-quarter (Q3 2025–Q2 2026) net loss to about KRW 8.41 billion.
The company completed a specialty semiconductor M-FAB with roughly 20,000 wafers per month of capacity and reorganized its structure and portfolio with a target utilization rate above 75%.
The company began mass-supplying miniature optical sensors to a top-1-to-2 global customer and completed development of a defense-grade GaN MMIC based on ETRI technology transfer.
The debt ratio rose from 36.5% in 2023 to 53.9% in 2025, and shareholders' equity declined from KRW 28.99 billion to KRW 22.11 billion over the same period due to accumulated losses.
Sigetronics, listed on KOSDAQ in August 2023, is a specialty semiconductor device company that develops and produces electrostatic discharge (ESD) and transient voltage suppression (TVS) protection devices, sensor devices such as avalanche photodiodes (APD), and power semiconductors including GaN, SiC, and MCT devices.
Building on manufacturing capability spanning silicon as well as advanced materials such as gallium arsenide, gallium nitride, and silicon carbide, the company has built a specialty semiconductor M-FAB with roughly 20,000 wafers per month of capacity.
The company owns its own epitaxial (Epi) process technology, which it applies directly to its foundry line, allowing it to also offer contract manufacturing services.
It recently reorganized its portfolio to expand from an ESD-centered business into optical sensors and volume foundry services, centered on six new products developed over the prior year.
In new business areas, the company has begun mass-supplying miniature optical sensors used in optical encoders for robots and industrial machinery to a top-1-to-2 global customer, and in defense it has localized a space-grade Schottky barrier diode with the Korea Aerospace Research Institute and developed a high-power radar semiconductor (X-Band PA MMIC) based on technology transfer from the Electronics and Telecommunications Research Institute.
Downstream demand cited includes protection devices for smartphones, electric vehicles, and industrial sensors, protection and signal devices for AI data centers, and sensors for robotics and physical AI applications.
In terms of competitive positioning, the ESD/TVS and optical sensor space is a fragmented market with numerous global discrete-device makers, and the company is cited as one of the few domestic players operating its own foundry.
| Quarter | Revenue | Operating profit | Op. margin |
|---|---|---|---|
| 2025Q2 | ₩3.4B | -₩1.9B | −55.9% |
| 2025Q3 | ₩3.9B | -₩1.6B | −41.8% |
| 2025Q4 | ₩2.8B | -₩2.5B | −89.5% |
| 2026Q1 | ₩3.6B | -₩2.3B | −63.1% |
| 2026Q2 | ₩3.8B | -₩2.1B | −56.5% |
| Year | Revenue | Operating profit | Net income (parent) | Op. margin | ROE | Debt-to-equity |
|---|---|---|---|---|---|---|
| 2022 | ₩14.5B | -₩4.8B | -₩4.4B | −33.4% | −36.9% | 114.9% |
| 2023 | ₩12.5B | -₩5.4B | -₩5.5B | −43.5% | −19.1% | 36.5% |
| 2024 | ₩12.2B | -₩6.3B | -₩5.7B | −51.6% | −24.2% | 42.8% |
| 2025 | ₩12.7B | -₩7.6B | -₩8B | −59.5% | −36.2% | 53.9% |
Consolidated basis (financial statements including subsidiaries) · Final figures from DART filings · Net income attributable to owners of the parent · Data as of 2026-09-05
Annual revenue fell from KRW 14.52 billion in 2022 to KRW 12.51 billion in 2023 and KRW 12.17 billion in 2024, then edged up slightly to KRW 12.75 billion in 2025, still below the 2022 level.
Operating losses, however, widened every year, from KRW 4.85 billion in 2022 to KRW 5.44 billion in 2023, KRW 6.29 billion in 2024, and KRW 7.59 billion in 2025, pushing the operating margin from -33.4% to -59.5% over that span.
Losses deepening even as revenue held roughly steady suggests a cost base—fab ramp-up fixed costs, R&D spending, and portfolio-restructuring expenses—growing faster than revenue. Net loss attributable to owners also widened from KRW 4.37 billion in 2022 to KRW 8.01 billion in 2025.
On a quarterly basis, Q3 2025 revenue of KRW 3.92 billion was the highest of the last five quarters shown, while its operating loss of KRW 1.64 billion was the smallest, suggesting losses narrow somewhat as revenue scales up.
But Q4 2025 revenue dropped sharply to KRW 2.81 billion and the operating loss widened to KRW 2.51 billion, underscoring significant quarter-to-quarter volatility.
In 2026, revenue recovered to KRW 3.59 billion in Q1 and KRW 3.78 billion in Q2, but operating losses remained sizable at KRW 2.26 billion and KRW 2.14 billion respectively, so the revenue recovery has not yet clearly translated into improved profitability.
Over the trailing four quarters (Q3 2025 through Q2 2026), the company posted combined revenue of about KRW 14.10 billion, an operating loss of about KRW 8.55 billion, and a net loss of about KRW 8.41 billion, indicating the loss-making pattern has persisted on a rolling annual basis as well.
The power and discrete-device and optical sensor markets are in a phase where rising power density and server integration in AI data centers are increasing demand for ESD and surge protection devices.
Demand for photosensors used to monitor heart rate, blood pressure, and sleep is also growing with the spread of wearable and healthcare devices, and expanding automation in robots and industrial machinery using optical encoders is cited as another growth driver for the optical sensor market.
Industry estimates put the global optical sensor market at about $24.5 billion in 2024, growing at over 10% annually to roughly $71.9 billion by 2032, with the external-environment optical sensor segment cited as accounting for more than half of the total market.
In power semiconductors, compound materials such as GaN and SiC are drawing attention in electric vehicles, 5G, and data centers for their higher-voltage, faster-switching, and higher-efficiency characteristics relative to silicon.
In defense, demand for GaN-on-SiC-based high-power semiconductors used in active electronically scanned array (AESA) radar is reported to be rising in the global defense market.
Sigetronics' simultaneous exposure to several of these sub-markets reduces dependence on any single downstream sector, but each of these fields already has established global competitors, meaning the company faces the dual challenge of achieving economies of scale and customer qualification as a newer entrant.
At its March 2026 annual general meeting, the company said it would pursue aggressive sales and production expansion using funds raised through a rights offering, and declared 2026 the starting point of a turn to profitability.
Completion of an approximately KRW 6 billion shareholder rights offering to reinforce its financial base was cited as the backdrop for this roadmap.
The company began mass production of new devices on a new line in 2026 and has set a goal of raising fab utilization above 75% within a short period to capture economies of scale.
In the optical sensor segment, following the start of mass supply to a top-1-to-2 global customer, reports have indicated an outlook for expanding related exports through 2027.
In defense, the company said it completed development and performance verification of an X-Band GaN MMIC, with related research submitted to and under review at an international journal (IEEE), and that it plans to expand into higher-frequency Ku-band and Ka-band products and build out full-scale production going forward.
Over the medium to long term, the company also outlined plans to expand into defense, robotics, and physical AI applications based on MEMS and power RF device technology.
Whether these plans translate into actual revenue and earnings improvement remains to be confirmed through upcoming quarterly results and fab utilization data.
Sigetronics has posted a net loss every year, so a price-to-earnings ratio cannot be calculated, and valuation discussion centers mainly on the price-to-book ratio. Both self-calculated and KRX-based price-to-book ratios sit at or below 1, meaning the market is valuing the company below its accounting net asset value.
According to one market data provider's tally, the average price-to-book ratio since listing has been around 1.5 times, so the stock currently trades at a lower multiple than that historical average. The company has no history of paying cash dividends, limiting any dividend-yield appeal.
Shareholders' equity has been on a declining trend since 2023 due to accumulated losses, meaning the capital base underlying book value per share is itself shrinking—a factor worth weighing alongside any valuation comparison.
PER, EPS, PBR and BPS are all calculated in-house (the same method as Naver and Toss) · Dividend yield = cash dividend per share from DART filings (supplemented by KRX) ÷ current price · As of 2026-09-05
The company began mass-supplying miniature optical sensors to a top-1-to-2 global customer, marking an entry point into the robotics and physical AI markets. In defense, it completed a GaN MMIC based on ETRI technology transfer and localized a space-grade SBD.
Diversifying revenue sources away from a single ESD-centered business toward optical sensors, power semiconductors, and defense-grade devices broadens the range of future growth paths.
The company completed a roughly 20,000-wafer-per-month M-FAB and reorganized its structure and portfolio with a target utilization rate above 75%.
Operating its own epitaxial process alongside foundry services, allowing it to manage the entire process from design to production, is cited as a strength for development speed and quality control.
If utilization reaches the target level, there is room for profitability to improve as fixed costs are spread over higher volume.
The company completed a roughly KRW 6 billion shareholder rights offering to secure funding for growth investment. It said it would use this to pursue aggressive sales and production expansion, and presented 2026 as the founding year of a turn to profitability. The capital raise partly offsets the shareholders' equity decline caused by accumulated losses.
The operating loss widened every year from KRW 4.85 billion in 2022 to KRW 7.59 billion in 2025, and the operating margin deteriorated from -33.4% to -59.5%.
Quarterly net losses in the KRW 2 billion range have continued through the first half of 2026, so the turnaround roadmap has not yet been confirmed in the actual figures. Even with a modest recent revenue recovery, the loss size itself remains large.
Annual revenue fell from KRW 14.52 billion in 2022 to KRW 12.17 billion in 2024, then edged up only slightly to KRW 12.75 billion in 2025, still below the level of four years earlier. Separate from the steady stream of new-business announcements, a clear growth curve lifting total revenue has not yet been confirmed. Quarterly revenue can also drop sharply, as seen in Q4 2025, indicating low stability.
The debt ratio rose from 36.5% in 2023 to 53.9% in 2025, while shareholders' equity fell from KRW 28.99 billion to KRW 22.11 billion over the same period. Although the rights offering added some capital, the structure is one in which recurring annual net losses keep eroding equity. If losses continue, the need for additional outside funding could grow.
Whether the process of raising fab utilization above 75% and converting the six new products into stable revenue proceeds as planned remains unverified. New products such as optical sensors and GaN MMICs also require time to stabilize production yield and quality. Any delay relative to the targeted timeline could also push back the point at which earnings improve.
Achievements such as optical sensor supply to a top-1-to-2 global customer and development of a defense MMIC are early-stage, and there may be a lag before actual production volumes and pricing are clearly reflected in the financial statements.
If dependence on a specific large customer grows, earnings sensitivity to negotiating leverage or volume swings could also increase.
With shareholders' equity continuing to decline due to accumulated losses, further losses could necessitate additional external financing such as another rights offering. Any additional capital raise would also carry the potential for dilution of existing shareholders' stakes.
The Q3 report filing will be the point to check revenue and operating loss trends, as well as whether fab utilization has improved.
It will be important to confirm whether the company reaches its targeted 75% fab utilization and whether that produces signs of an improved cost structure.
The outcome of the IEEE review for the X-Band GaN MMIC, along with progress on follow-on Ku-band/Ka-band product development and production system buildout, warrants monitoring.
It will be worth tracking, quarter by quarter, whether the outlook for expanding optical sensor exports to a top-1-to-2 global customer translates into actual volume and revenue.
Sigetronics is broadening its portfolio from an ESD/TVS protection-device-centered business into optical sensors, power semiconductors, and defense-grade devices, announcing a series of new customer wins and technology validations along the way.
At the same time, the confirmed financial statements show operating losses widening for four straight years from 2022 through 2025 and shareholders' equity declining, with quarterly net losses continuing through the first half of 2026.
The targeted 75% fab utilization rate, the financial buffer secured through the rights offering, and the start of mass supply to a global customer can be seen as the basis for the company's stated turnaround roadmap, but whether these translate into actual earnings improvement remains to be confirmed.
On the valuation side, the shares trade at a lower multiple relative to net asset value, while profitability ratios cannot be calculated given the ongoing net losses.
Taken together, this is a phase where early signals of new-business expansion coexist with persistent losses, and upcoming quarterly results and utilization data will be the key variables to watch for direction.
Report written 2026-09-05 · Data as of 2026-09-04
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