Kostecsys

Kostecsys was founded in 1997 as a maker of thermal materials and structural components for semiconductor packaging, and it was listed on KOSDAQ in 2023 through a merger with a special-purpose acquisition company.

Its core technology is the KCMC (copper-molybdenum composite) material platform, which combines low thermal expansion with high thermal conductivity and underpins RF communication packages, power-semiconductor spacers, and thermal base plates.

Its flagship products are ceramic, LCP, and QFN packages used in 5G power transistors, supplied on a production basis to NXP, typically under recurring, relatively small supply contracts. Given its B2B model, its customer base is understood to also include Hyundai Motor in addition to NXP.

More recently, the business has expanded toward chip spacers and via spacers for SiC and GaN devices that address heat dissipation in electric-vehicle and industrial power semiconductors as well as AI data-center power modules, and these products have passed a US production qualification at global chipmaker Onsemi and entered full delivery.

The company also broadened its customer base by signing a large-scale spacer supply agreement with a North American semiconductor company running from July 2025 through December 2027 on a quarterly confirmed-order basis.

Separately, it developed wafer bonding/debonding equipment used in high-bandwidth memory (HBM) manufacturing, employing ultraviolet laser technology as it explores a new business area.

The power-semiconductor thermal spacer market has traditionally been dominated by Japanese suppliers, and Kostecsys is positioned to challenge that structure through domestic localization efforts.

Consolidated revenue fell sharply from KRW 25.35 billion in 2022 to KRW 11.55 billion in 2023, a 54.4% drop, and operating profit swung from a KRW 3.57 billion gain to a KRW 1.32 billion loss over the same period.

In 2024, revenue rose modestly to KRW 14.21 billion, but the operating loss widened to KRW 1.89 billion, pushing the operating margin down to -13.3%.

In 2025, revenue reached KRW 15.22 billion with operating profit of KRW 184 million (a 1.2% operating margin), marking a full-year turn to operating profit, although the bottom line remained a net loss of KRW 563 million.

On a quarterly basis, operating losses persisted in 2Q25 (-KRW 350 million) and 3Q25 (-KRW 320 million) before revenue jumped to KRW 5.71 billion in 4Q25, producing operating profit of KRW 1.24 billion and net income of KRW 789 million — a clear inflection point.

That momentum carried through 1Q26 (revenue KRW 5.45 billion, operating profit KRW 1.13 billion, net income KRW 947 million) and 2Q26 (revenue KRW 5.34 billion, operating profit KRW 1.19 billion, net income KRW 900 million), sustaining three consecutive quarters of double-digit-billion-won operating profit.

Summed over the most recent four quarters (3Q25–2Q26), revenue reached KRW 19.50 billion, operating profit KRW 3.24 billion, and owners' net income KRW 2.11 billion — already exceeding the prior full-year results.

On the balance sheet, the debt ratio fluctuated from 274.3% in 2022 to 46.1% in 2023, 77.0% in 2024, and 151.1% in 2025, a pattern that can be linked to liabilities incurred for capacity investment such as spacer capacity expansion.

Operating cash flow also improved, moving from net outflows of KRW 6.08 billion in 2023 and KRW 1.34 billion in 2024 to a net inflow of KRW 539 million in 2025, providing cash-flow support for the shift to profitability.

The market for power-semiconductor thermal components is growing alongside expanding adoption of next-generation SiC and GaN power devices, tied to rising heat-management requirements as AI data-center power density increases.

The GaN RF device market that Kostecsys operates in is projected to grow at an 18% annual rate, and the company is pursuing greater market share within it.

The power-semiconductor thermal spacer market has traditionally been dominated by Japanese suppliers, and Kostecsys is regarded as having built a vertically integrated position from thermal materials to finished packages after pursuing localization of SiC power-semiconductor thermal spacers since 2019.

Growing RF semiconductor demand from 5G network expansion, together with growth in the power-semiconductor market for electric vehicles and energy storage systems, is cited as a backdrop for the company's revenue expansion.

In terms of competitive positioning, its established RF package business counts NXP, STMicroelectronics, and Microchip among its major global customers, while its spacer business is emerging around supply to US power-semiconductor companies including Onsemi as a new growth channel.

Structurally, as data-center and electric-vehicle power infrastructure investment continues, both domestic and overseas back-end and materials suppliers are entering the thermal-solution competition, making the durability of Kostecsys's technical differentiation an important variable going forward.

Kiwoom Securities analyst Kim Hak-jun projected in an April 28, 2026 report that 2026 revenue would reach KRW 41.8 billion (up 174.6% year over year) with operating profit of about KRW 9.5 billion, and noted an expectation of roughly KRW 5.0 billion in new revenue in the second half of 2026 from RF communication chips used in missile systems such as Cheongung, supplied through a domestic partner.

The same report explained that the company supplies spacers into power modules rated above 800VDC and that its materials are diversifying across multiple products as stacked integration expands.

Earlier, in a July 16, 2025 report, Kiwoom had also cited expectations for structural growth driven by expanding end markets and higher-value-added spacer supply, though it did not issue an investment rating or price target.

The KRW 59.4 billion spacer supply contract with the North American semiconductor company runs on a quarterly confirmed-purchase-order basis, and revenue contribution appears to have begun in earnest from the fourth quarter of 2025. As of late May 2026, Morgan Stanley & Co.

International plc was confirmed to have appeared on the shareholder disclosure list as a major shareholder.

Given that the company has continued to share, through investor relations, updates on qualification progress with other customers for its SiC power-semiconductor spacers and on capacity-expansion plans, whether it secures additional customers and the timing of capacity additions are likely to be key to further revenue acceleration.

That said, prior reports have noted that the production schedule for electric-vehicle spacers could be delayed depending on whether specific vehicle models are confirmed for production.