J.E.T. Co., LTD.
6228・Standard Market・Machinery
Business
J.E.T. Co., LTD. is primarily engaged in the development, design, manufacture, and sale of cleaning equipment used in front-end semiconductor manufacturing processes. Having inherited the technology and customer base of its predecessor, SES Co., Ltd., in 2009, the company offers batch-type cleaning equipment (BW3700, BW3000, BW2000, BW3500) and single-wafer cleaning equipment (HTS-300). Its main customers are major semiconductor manufacturers in South Korea, China, and Taiwan, including Samsung Electronics, with sales to South Korea (¥6,338 million) and China (¥6,525 million) accounting for the majority of revenue in FY2025 (ending December 2025). The company is also pursuing new business expansion into the U.S. and Japanese markets, and in addition to equipment sales, it operates a field service business covering maintenance, modification, and parts sales.
Business Model
The company manufactures semiconductor cleaning equipment on a build-to-order basis, adopting an advance-payment-based cash collection structure in which approximately 90% of the equipment price is collected by the time of shipment. In addition to equipment sales, the company accumulates field service revenue from maintenance, modification, and parts sales for previously delivered equipment. By establishing local subsidiaries or branch offices in Korea, Taiwan, China, the United States, and Japan and building an after-sales service framework, the company maintains ongoing relationships with customers, leading to orders for their next round of capital investment. The company also utilizes sales support outsourcing arrangements with its parent company, ZEUS Co., Ltd., which involve payment of sales commissions (3% to 5% of the sales price).
Company Strengths
Including the era of the predecessor company S.E.S. Co., Ltd., the company has delivered a cumulative total of over 1,000 cleaning systems to semiconductor manufacturers in South Korea, Taiwan, China, Japan, the United States, and elsewhere. Even counting only deliveries since the establishment of the current company, more than 500 units have been delivered, including over 400 units to Samsung Electronics, including designated adoption for specialized processes. This track record underpins the company's credibility in developing new customers.
The batch-type cleaning systems feature a customizable design that allows the configuration and number of cleaning tanks to be modified according to customer requirements, and the proprietary F-Type, which separates wafer loading and unloading to the front and rear, maximizes the number of wafers processed per unit of time. The single-wafer HTS-300 has a high-temperature processing capability of up to 240°C and has been adopted for specialized processes not supported by other companies. The company's estimated share of the global batch-type cleaning equipment market in fiscal 2024 was approximately 8.8%.
In addition to its main markets of South Korea (via parent company ZEUS and its Korean branch), China (Oribright Shanghai), and Taiwan (J.E.T. Semi-Con. International Taiwan), the company began operations in the U.S. market through JET AMERICA INC., established in October 2023, and started sales activities in the Japanese market from January 2024. Through this five-region structure, the company has built a system that integrates after-sales service with the acquisition of new orders.
ENVALITH's Perspective
Performance Trend
Revenue declined for three consecutive periods, from ¥23,129 million in FY2023 (ending December 2023) to ¥19,316 million in FY2024 (ending December 2024) to ¥14,662 million in FY2025 (ending December 2025), shrinking approximately 36% over two years. Operating income declined from ¥1,762 million in FY2023 (ending December 2023) to ¥1,087 million in FY2024 (ending December 2024), and turned negative to ¥-1,493 million in FY2025 (ending December 2025). Net income also fell to ¥-2,336 million. The primary external factors were the stagnation of capital investment for mature-generation semiconductors in the Chinese market and intensifying competition with Chinese domestic equipment manufacturers. In addition, the recognition of low-margin projects, inventory valuation losses, and the reversal of deferred tax assets significantly worsened profit and loss.
Growth Strategy
Pursuing diversification through expanded sales of the new BW3500 and innovative single-wafer cleaning equipment, alongside market development in the U.S. and Japan
The company aims to expand sales of the BW3500, which began sales in July 2024, in its core markets of South Korea, China, and Taiwan, promoting a switchover from the existing BW3000. In China, it will strengthen proposals targeting advanced semiconductor investment at 28nm and below.
The company has advanced joint development of innovative single-wafer cleaning equipment for a leading Japanese foundry to its final stage, and has also received inquiries regarding adoption consideration from a global Japanese sensor semiconductor manufacturer and a global Taiwanese foundry. Capital expenditure of ¥412 million was made in FY2025 (ending December 2025) for the development and manufacture of the new single-wafer cleaning equipment.
Through JET AMERICA INC., established in October 2023, the company recorded sales of ¥690 million in FY2025 (ending December 2025) from cleaning equipment for glass interposers. The company will continue to pursue new customer development in the U.S. market.
In September 2025, the company acquired a 24.0% equity interest in Xinbisi Semiconductor Technology (Nantong) Co., Ltd., making it an equity-method affiliate. The company aims to sell domestically produced Chinese equipment to semiconductor manufacturers that continue capital investment.
Leveraging its five-region structure spanning South Korea, Taiwan, China, the United States, and Japan, the company aims to actively expand field service revenue overseas—from maintenance, modification, and parts sales for installed equipment—to stabilize earnings during market downturns.
Last updated: July 19, 2026