ENVALITH
株式会社精工技研 logo

SEIKOH GIKEN Co., Ltd.

6834・Standard Market・Electric Appliances

Official website
株式会社精工技研 logo
SEIKOH GIKEN Co., Ltd.6834

Business

Seiko Giken Co., Ltd. is a precision components manufacturer founded in 1972, operating two business segments: "Precision Equipment-related" and "Optical Products-related." In the Precision Equipment-related segment, the company manufactures and sells precision molded products, molds, and metal parts for automobiles and electronic devices, while in the Optical Products-related segment, it handles optical connectors, optical connector polishing machines, inspection and measurement equipment, and photoelectric field sensors, among other products. With 11 consolidated subsidiaries in Japan and overseas (in the U.S., Germany, China, Thailand, France, etc.), the company has built a global development, manufacturing, and sales structure. Its major customers include leading companies in the automotive and information/communications fields such as DENSO, Toyota Industries, and Corning Optical Communications, and consolidated net sales for FY2026 (ending March 2026) reached a record high of ¥30,088 million.

Business Model

Centered on in-house developed precision mold, molding, and optical technologies, the company offers a combination of consumable parts such as optical connectors and manufacturing equipment such as optical connector polishing machines. With both parts and equipment forming two pillars, the business is deeply embedded in customers' manufacturing processes, and customer relationships are maintained through domestic and overseas trade shows, trading companies, and distributors. Multiple production sites in China, Thailand, and Japan balance manufacturing costs with supply stability, and the cost ratio is being improved through an increasing proportion of high-value-added products.

Company Strengths

The company has an in-house group structure for the integrated development, manufacturing, and sales of optical connectors (consumable parts) and optical connector polishing machines and inspection/measurement equipment (manufacturing equipment). In FY2026 (ending March 2026), sales related to optical products reached a record high of ¥20,124 million (up 86.6% year on year), and the order backlog also accumulated to ¥8,313 million (up 176.2% year on year), confirming deep integration into customers' manufacturing processes.

Since selling the world's first mass-production spherical polishing machine for optical connectors in 1987, the company has continuously deepened its precision mold, precision molding, and optical technologies. As of the end of March 2025, it held 172 patents domestically and internationally, and its medium-term plan sets a target of increasing patent registrations by 30% or more by the end of FY2026 compared to the end of FY2021. This forms a technological entry barrier that is difficult for competitors to imitate in a short period.

The company has established a system for manufacturing optical communication components across multiple sites in Japan (Matsudo), China (Hangzhou, Dalian, Hebi), and Thailand. In FY2026 (ending March 2026), it achieved approximately a threefold expansion of production capacity for optical connector polishing machines within a single year, demonstrating its ability to respond to a surge in demand. The Thailand subsidiary passed customer factory audits and began mass production, achieving both geopolitical risk diversification and supply stability.

ENVALITH's Perspective

In FY2026 (ending March 2026), sales related to optical products rose 86.6% year on year to ¥20,124 million, with segment profit of ¥6,668 million, driving overall company performance. As an external factor, the accelerating social implementation of generative AI and the rush of data center construction have caused demand to surge sharply, and as long as this tailwind continues, a high level of performance can be expected to be maintained. On the other hand, continued attention is needed regarding the downside risk to performance should there be a shift in the data center investment cycle or should customers curb capital expenditure.

Sales related to precision equipment in FY2026 (ending March 2026) reached a record high of ¥9,963 million (up 8.3% year on year), but segment profit remained at only ¥1,065 million, with a profit margin of approximately 10.7%, diverging significantly from that of optical products (approximately 33.1%). Sales of parts and molds for electric vehicles continue to decline, and the structural transformation of the automotive industry accompanying the shift to EVs is constraining the improvement of profitability in the precision equipment segment. While MG's full-year contribution continues, improving the profit margin of the precision equipment segment is a challenge for stabilizing overall company earnings.

The consolidated earnings forecast for FY2027 (ending March 2026) projects sales of ¥34,000 million (up 13.0% year on year), operating profit of ¥8,300 million (up 7.3%), and net income attributable to owners of parent of ¥6,400 million (up 3.0%), indicating continued growth in both revenue and profit, but the growth rate slows significantly from FY2026 (ending March 2026) (sales up 50.6%, operating profit up 174.5%). The annual dividend is planned to be increased to ¥120 (from ¥100 in the previous period), showing a proactive stance toward shareholder returns, but the payout ratio remains low at 16.8%. As the final year of the medium-term plan, the focus of investment decisions will be on the degree of certainty in achieving the newly revised upward targets (sales of ¥34,000 million, operating profit of ¥8,300 million) and the presentation of a growth scenario beyond that.

Growth Strategy

Accelerating growth across three axes—optical communications, EVs, and M&A—while diversifying the global supply chain

In addition to the start of mass production of optical connectors at Thai subsidiary SEIKOH GIKEN (THAILAND), the company established Seikoh Giken Optoelectronics (Hebi) Co., Ltd. in Hebi City, Henan Province, China in January 2025, building a mass-production system for next-generation multi-fiber optical connectors. This will secure supply capacity in response to continued growth in data center demand while simultaneously strengthening BCP measures.

The company is advancing development of multi-fiber optical connectors and other products used for ultra-high-speed, high-bandwidth parallel optical transmission. By adapting its product portfolio to next-generation standards, it aims to capture new demand arising from progress in power-saving and optoelectronic integration technologies, thereby maintaining a competitive advantage.

The company continues to resolve technical challenges toward commercializing the in-mold coating technology 'SSIMC,' jointly developed with Sumitomo Heavy Industries, as a system-sales product. It is also expanding precision molded products into new industrial fields such as automotive, medical, and biotechnology, aiming to respond to changes in automotive component composition driven by EV adoption and to improve profitability.

MG Co., Ltd. (mass production molding of automotive connectors and office equipment parts), which became a consolidated subsidiary in October 2024, contributed for a full fiscal year in FY2026 (ending March 2026), helping precision equipment-related sales reach a record high. The company will continue to use M&A as a growth lever, pursuing synergies with its existing technologies.

The company achieved its original FY2027 (ending March 2027) targets—net sales of ¥25,000 million and operating profit of ¥3,300 million—one year ahead of schedule, in FY2026 (ending March 2026). In light of this, the final-year targets have been revised upward to net sales of ¥34,000 million and operating profit of ¥8,300 million, and the company is working to build a foundation for continued growth.

Last updated: July 19, 2026