ENVALITH
スミダコーポレーション株式会社 logo

SUMIDA CORPORATION

6817・Prime Market・Electric Appliances

Official website
スミダコーポレーション株式会社 logo
SUMIDA CORPORATION6817

Business

Sumida Corporation, founded in 1956, is a coil specialist manufacturer that operates as a pure holding company overseeing consolidated subsidiaries in Japan and overseas. It supplies a diverse range of coil-related components and modules—including Power Inductors, Transformers, EMC Filters, and Sensors—to three markets: automotive-related (approximately 60% of sales composition), industrial-related, and home appliance-related applications. The company consists of two segments, Asia Pacific Business (approximately 67% of sales) and EU Business (approximately 39% of sales), and has established a local production-for-local-consumption system that completes design, manufacturing, and sales within each of the Asia, Europe, and North America regions. In October 2025, the company made Schmidbauer, a German specialist in Large Coils, a subsidiary, expanding its business domain into high-power applications such as wind power, railways, and defense. The company is listed on the Tokyo Stock Exchange Prime Market.

Business Model

Coils are custom products whose specifications are finalized at the final stage of electronic circuit design, and technical capability to respond to different required specifications each time serves as a barrier to entry. By providing the "eight integrated technologies" of winding, surface treatment, molding, precision processing, materials, design, evaluation, and production as a one-stop service, the company achieves customers' required quality, delivery times, and costs, thereby securing continued orders. Production is centered on Asian bases such as China and Vietnam, while regional production is also conducted in Europe (Romania and Slovenia) and North America, achieving both cost competitiveness and diversification of geopolitical risk. Since capital expenditures are executed based on already-secured orders, the company places emphasis on managing capital efficiency.

Company Strengths

The company possesses eight core technology elements in-house—winding, surface treatment, molding, precision processing, materials, design, evaluation, and production—enabling a one-stop system for developing and mass-producing coils with specifications that differ by customer. R&D expenses in FY2025 (ending December 2025) amounted to ¥5,632 million (Asia Pacific ¥4,168 million, EU ¥1,463 million), reflecting continuous reinforcement of the technology base.

Starting with its entry into Taiwan and Hong Kong in the 1970s, the company expanded production sites to China, Vietnam, Europe, and North America. It now has a structure in place to complete design, manufacturing, and sales within each of the Asia, Europe, and North America regions, keeping the direct impact of U.S. tariffs minor while meeting customers' local production and consumption needs. In FY2025 (ending December 2025), sales by production region were diversified: China ¥77,516 million, Europe ¥44,646 million, North America ¥12,779 million, and Asia (excluding China) ¥12,251 million.

In October 2025, the company acquired 80% of the issued shares of Schmidbauer (Germany), a specialist manufacturer of large coils for high-output applications such as wind power generation, railways, defense, and marine vessels, making it a subsidiary. This provided access to a new market with almost no overlap in customer base with the company's existing small coil business, and it plans to expand the production and sales regions of Schmidbauer Products by leveraging Sumida's global manufacturing footprint.

ENVALITH's Perspective

In Q1 FY2026, revenue was ¥38,428 million (up 8.6% year-on-year) and operating profit was ¥1,511 million (up 22.2% year-on-year), marking a solid start. However, the full-year forecast (revenue of ¥156,000 million, operating profit of ¥7,500 million) remains unchanged, with Q1 progress rates standing at only 24.6% for revenue and 20.1% for operating profit. The pullback from front-loaded demand driven by U.S. tariff risk has already become apparent in North American automotive demand, requiring close attention to demand trends in the second half.

At the end of Q1 FY2026, net interest-bearing debt stood at ¥52,929 million, with a net D/E ratio of 0.84x (up 0.03 points from the end of the previous fiscal year). Approximately 80% of borrowings are at floating interest rates, and under an average borrowing rate of 2.9%, financial expenses increased to ¥613 million (up ¥50 million year-on-year), continuing an upward trend. As an external factor, with interest rate levels remaining elevated, financial income/expenses turned negative at ¥610 million due to the impact of interest payments and other items, significantly reducing the conversion rate from operating profit to profit before tax—an issue that remains a continuing challenge.

Segment profit in the EU Business reached ¥838 million (up 89.5% year-on-year), clearly reflecting the effects of the business restructuring completed in the previous fiscal year. Meanwhile, segment profit in the Asia Pacific Business declined to ¥645 million (down 21.4% year-on-year), a decrease despite this being the final year of optimizing indirect costs at Chinese manufacturing operations. To achieve the ROE target of 8.4% or higher (FY2028) set out in the Medium-Term Management Plan 2026-2028, simultaneous improvement in both segments and cumulative free cash flow generation of at least ¥23.0 billion over three years are required, and verifying the feasibility of this will be a key focus of investment decisions.

Growth Strategy

Targeting ROE of 8.4% and FCF of ¥23.0 billion by 2028, the company pursues growth through three drivers: xEV, AI data centers, and Schmidbauer.

Capturing the medium-to-long-term growth trend across the overall xEV segment, including HV and PHEV, by expanding supply of coils supporting higher voltage and higher efficiency. Automotive-related sales in Q1 FY2026 (ending March 2026) were solid at ¥22,677 million (up 2.9% year on year). Full acquisition of vogtronics' equity has established a foundation for expanding xEV business at the Slovenia and Mexico sites.

Capturing demand related to power supply and cooling for high-load servers driven by the spread of generative AI, as well as needs for strengthening power generation and transmission grid infrastructure. Industry-related sales in Q1 FY2026 (ending March 2026) grew strongly to ¥10,887 million (up 19.2% year on year). Data center-related demand was confirmed to be trending favorably.

Continuing to capture the net sales increase effect from Schmidbauer in large coil areas such as wind power generation, railways, defense, and marine vessels. In Q1 FY2026 (ending March 2026), this functioned as a net increase factor in EU Business sales, with EU Business segment profit reaching ¥838 million, up 89.5% year on year. PMI (post-merger integration) promotion and acquisition of projects in new areas continue.

Promoting improvement in manufacturing efficiency, including the optimization of manufacturing indirect costs in China (final year of the three-year plan), along with cost reductions in indirect areas. In Q1 FY2026 (ending March 2026), reduced fixed cost burden due to higher utilization rates contributed ¥449 million as a profit-increasing factor. Strengthening the earnings structure in conjunction with a focus on high-value-added areas.

Last updated: July 17, 2026