Sumitomo Metal Mining Co., Ltd.

As a company listed on the Tokyo Stock Exchange Prime Market, Sumitomo Metal Mining Co., Ltd. discloses its major shareholders through its statutory securities report rather than a complete, continuously updated share register. According to shareholder data reported as of 31 March 2026, the company had approximately 75,540 shareholders of record; financial institutions held about 30.6 percent of outstanding shares and foreign investors held approximately 37.97 percent. The largest disclosed holder was Japan Master Trust Bank, Ltd. (trust account) at approximately 17.22 percent, followed by Custody Bank of Japan, Ltd. (trust account) at approximately 6.2 percent, State Street Bank and Trust Company (account 505001) at approximately 4.27 percent, Toyota Motor Corporation at approximately 4.09 percent, and BNY Mellon as agent for non-treaty JASDEC clients at approximately 3.12 percent, with Sumitomo Life Insurance Company, JPMorgan Chase Bank (account 385781) and Nippon Life Insurance Company each holding smaller stakes.

This is a major-shareholders-only disclosure: it lists the largest registered holders required by Japanese securities-report rules, not the company’s full base of individual and institutional shareholders. Several of the largest positions, including Japan Master Trust Bank and Custody Bank of Japan, are held in trust accounts on behalf of underlying institutional clients whose individual identities are not disclosed in the securities report, so these percentages do not identify the beneficial owner of the shares held in those accounts.

No ultimate beneficial owner can be identified from this information. No shareholder or reported trust holding approaches a controlling stake, the largest trust-account holdings are nominee positions for undisclosed underlying clients, and Japan’s disclosure regime for a widely held listed company of this size does not require publication of a beneficial-ownership register.

The on-file officer record for Sumitomo Metal Mining Co., Ltd. lists five active individuals out of 22 officer records held in total: Nobumasa Kemori as Chief Executive Officer, Toru Higo as Senior Managing Executive Officer, General Manager of Corporate Planning and Director, Yoshiaki Nakazato as Executive Chairman, Hideyuki Okamoto as Managing Executive Officer, General Manager of the Mineral Resources Business Unit and Director, and Mihoko Yano as Executive Officer and General Manager of the Sustainability Department, appointed 1 January 2019. Nationality, country of residence and most appointment dates are not recorded for these individuals.

This roster does not reflect the company’s current board. According to Sumitomo Metal Mining Co., Ltd.’s own corporate-information pages and a personnel announcement dated 11 May 2026, the Board of Directors changed effective 25 June 2026: Nobuhiro Matsumoto became Representative Director and President, Akira Nozaki moved from President to Representative Director and Chairman, and the current executive directors also include Masaru Takebayashi and Yasuhiro Miyake, alongside four outside directors and four statutory auditors. None of the five individuals in the on-file record hold these current representative-director roles, and Yoshiaki Nakazato, shown here as active Executive Chairman, had already left that position before the 2026 changes.

Nationality and country of residence are not disclosed for any of the listed individuals; Japan’s corporate registry does not publish this information, so it should be treated as not disclosed rather than absent. The available officer information is therefore best described as historical: it corresponds to an earlier point in the company’s governance rather than to the board and executive structure now in place.

Sumitomo Metal Mining Co., Ltd. is an independent, listed parent company: no immediate or ultimate parent is disclosed for the entity, consistent with its status as a Tokyo Stock Exchange Prime Market company. Beneath it sits a large multinational group of subsidiaries, affiliates and joint ventures engaged in mineral resource development, non-ferrous metal smelting and refining, and materials manufacturing, spanning Japan and more than a dozen other jurisdictions including the Philippines, the United States, Canada, Peru, Australia, South Korea, Vietnam, China, Taiwan, the Netherlands and the United Kingdom.

One relationship independently confirmed through an official filing is the company’s own establishment in the United Kingdom: UK Companies House records “Sumitomo Metal Mining Co., Ltd.” (company number FC018829) as an overseas company with a UK establishment, not a separate legal entity, whose home-country registration is given as number 0104-01-015273 with the Tokyo Legal Affairs Bureau, Minato Branch — the same registration underlying this profile’s Japanese corporate number. This UK establishment is accordingly a branch of Sumitomo Metal Mining Co., Ltd. rather than a subsidiary.

The remaining entities recorded in the underlying corporate-linkage data — including Sumiko Logistics Co., Ltd. and Shisaka Smelting Co., Ltd. in Japan, Coral Bay Nickel Corporation and Taganito HPAL Nickel Corporation in the Philippines, Sumitomo Metal Mining America Inc. and Sumitomo Metal Mining Arizona, Inc. in the United States, Sumitomo Metal Mining Oceania Pty Ltd in Australia, SMM Korea Co., Ltd., SMM Vietnam Co., Ltd. and SMMCV Holding B.V. in the Netherlands — correspond to entities publicly associated with Sumitomo Metal Mining Co., Ltd.’s mineral resources and smelting operations, but ownership percentages and the direct-versus-indirect nature of each holding are not independently confirmed here, so they are presented as disclosed group affiliates rather than fully verified parent or subsidiary relationships.

Group-structure information for Sumitomo Metal Mining Co., Ltd. is partial: a UK branch relationship is independently verified through Companies House, and a broad set of affiliated group entities is recorded across mining, smelting and materials operations, but ownership and voting percentages for those entities are not disclosed in the sources reviewed here.