- Business
- Sumiseki Holdings, Inc. (1514.T) is a Japan-based holding company primarily engaged in the coal business, new materials production, and quarrying operations. The company imports, purchases, and sells coal primarily in Japan through its Coal segment; manufactures and sells synthetic diamonds and artificial diamonds for industrial use via its New Materials segment; and collects, processes, and sells crushed stones in its Quarry segment. It also invests in overseas coal mines, particularly in Australia, from which it receives substantial dividend income, and operates through subsidiaries like Sumiseki Trading Co., Ltd., which provides thermal coal trading and logistical services including coal stock yards. Founded in 2008 and headquartered in Tokyo, Japan, Sumiseki Holdings maintains primary operations in Japan with expanding revenue contributions from Australia. In recent developments, the company entered into a capital and business alliance agreement with Asou Co., Ltd. in May 2024, which led to a change in its parent company status by May 2024; announced a new medium-term management plan in May 2025; executed a basic agreement for another capital and business alliance in May 2025; disclosed a stock transfer agreement in July 2025; and continues to receive regular dividends from its Australian coal mine investments, including notifications in September 2024, March 2025, and June 2025 from subsidiaries.