ENVALITH
SECカーボン株式会社 logo

SEC CARBON,LIMITED

5304・Standard Market・Glass & Ceramics Products

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SECカーボン株式会社 logo
SEC CARBON,LIMITED5304

Business

SEC CARBON,LIMITED, founded in 1934, is a carbon products specialist manufacturer listed on the Standard Market of the Tokyo Stock Exchange. The company operates four product groups: Cathode Blocks for Aluminum Smelting (70.6% of net sales), Artificial Graphite Electrodes (14.5%), Special Carbon Products (11.7%), and Fine Powder and Other Carbon Products (3.2%). Manufacturing is conducted at two main sites, the Kyoto Plant (Fukuchiyama City) and the Okayama Plant, and products are supplied to aluminum smelting companies, electric furnace steelmakers, industrial furnace manufacturers, and others in Japan and overseas, with Sumisho CRM Co., Ltd. as the main sales channel (66.6% of net sales). The group conducts business through 3 subsidiaries and 1 affiliated company.

Business Model

A manufacturing and sales model based primarily on forecast production driven by user production trends, combined in part with build-to-order production. The company handles everything in-house, from raw material procurement to manufacturing and sales, and maintained a high operating margin of 21.9% in FY2025 (ended March 2025). It maintains financial soundness by funding capital expenditures with internal funds, with an equity ratio reaching 90.7%. While leveraging its sales channel through its main customer, Sumisho CRM Corporation, dividends received from investment securities have also contributed to non-operating income.

Company Strengths

The operating margin for FY2025 (ended March 2025) remained at a high level of 21.9%. The equity ratio rose from 83.0% in the previous fiscal year to 90.7%, with net assets of ¥73,801 million secured against total assets of ¥81,395 million. The company possesses financial soundness sufficient to fund capital expenditures entirely from internal resources.

The company began manufacturing cathode blocks following the 1986 merger with Kyowa Carbon, building a track record as a global standard for graphitized cathode blocks. In FY2025 (ended March 2025), this remained the company's core product, maintaining a firm position with sales of ¥22,002 million, accounting for 70.6% of total sales.

Since its founding in 1934, the company has accumulated over 90 years of manufacturing and evaluation technology for carbon materials. R&D expenses for FY2025 (ended March 2025) totaled ¥555 million, with ongoing research in next-generation fields such as fine powder for lithium-ion secondary batteries, extending the service life of components for high-temperature industrial furnaces, and CO₂ utilization (molten salt electrolysis technology).

ENVALITH's Perspective

The net loss for FY2026 (ending March 2026) is mainly attributable to an impairment loss of ¥6,063 million, and the impact on performance is largely of a one-time nature. On the other hand, net sales stood at ¥25,101 million, remaining sharply down from the peak of ¥37,307 million recorded in FY2024 (ended March 2024). As an external factor, the timing of recovery in aluminum smelting demand and crude steel production will be key to a turnaround in performance. Trends in the resolution of inventory adjustments warrant close monitoring.

The structure in which the main sales channel is concentrated in Sumisho CRM (a Sumitomo Corporation group company) continues to remain a structural risk from the standpoint of bargaining power and pricing power. In addition, risks stemming from U.S. tariff policy have become apparent, raising concerns about the impact on the carbon products business, which has a high dependence on exports. As an external factor, trends in trade policy could affect the earnings outlook going forward.

While the investment phase continues, with ¥3,567 million in acquisitions of property, plant and equipment and ¥1,959 million in acquisitions of investment securities, the operating margin declined from 27.4% in FY2024 (ended March 2024) to 16.0% in FY2026 (ending March 2026). Dividend payments of ¥2,004 million have been maintained, indicating that the company's stance on shareholder returns remains firm; however, without a full-fledged recovery in profitability, questions about sustainability arise. The company faces a phase in which results toward the final year of "Sustainable 2026" will be put to the test.

Growth Strategy

The Company aims for sustainable growth under the three pillars of "Sustainable 2026" (strengthening growth foundation, strengthening management structure, and promoting capital policy).

Through continuous capital investment in buildings, machinery and equipment, etc. (acquisition of property, plant and equipment of ¥3,567 million in FY2026 (ending March 2026)), the Company aims to secure supply capacity for a phase of demand recovery. Depreciation expense increased significantly year on year to ¥2,048 million, indicating that the investment phase is ongoing.

Nippon Denkyoku Co., Ltd. was made an equity-method affiliate, deepening business collaboration in the field of Artificial Graphite Electrodes. During the current period, an equity in losses of affiliates of ¥16 million was recorded, and while revenue contribution is still a work in progress, expansion of the business foundation is advancing.

Despite recording a net loss, the Company maintained dividend payments of ¥2,004 million, upholding its stance on shareholder returns. It also continued to build up investment securities, with acquisitions of ¥1,959 million, thereby strengthening a structure in which non-operating income such as dividends received supplements earnings.

Last updated: July 17, 2026