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Sumitomo Metal Mining Reports Ransomware Attack at Philippine Nickel Subsidiary

Tipranks • April 8, 2026

Sumitomo Metal Mining has disclosed that its Philippine nickel smelting subsidiary, Coral Bay Nickel Corporation, suffered a ransomware attack in which two servers were encrypted following unauthorized third-party access. The company immediately isolated the affected servers and, with external specialists, is investigating the scope of the breach and working to restore systems, while apologizing to business partners and stakeholders.

Operations at Coral Bay Nickel’s production plant remain unaffected, with control systems intact and production continuing, and there has been no impact on other group mines, smelters, refineries, or plants. The networks of Coral Bay Nickel, Sumitomo Metal Mining Philippine Holdings, and Taganito HPAL Nickel have been disconnected as a precaution, and although the group currently expects only a limited impact on consolidated results for the fiscal year ended March 2026, a detailed assessment of financial effects is ongoing.

The most recent analyst rating on (JP:5713) stock is a Buy with a Yen9829.00 price target. To see the full list of analyst forecasts on Sumitomo Metal Mining Co stock, see the JP:5713 Stock Forecast page .

More Sumitomo Metal Mining Co

Sumitomo Metal Mining Co., Ltd. is a Japanese non-ferrous metals producer focused on mining, smelting, and refining operations, with a strong presence in nickel smelting through subsidiaries such as Coral Bay Nickel Corporation in the Philippines. The company supplies key materials for global industrial and battery-related applications and operates mines, smelters, refineries, and plants worldwide.

Average Trading Volume: 6,435,376

Technical Sentiment Signal: Strong Buy

Current Market Cap: Yen2603.7B

For an in-depth examination of 5713 stock, go to TipRanks’ Overview page .

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Ransomware Attack Hits Sumitomo's Philippine Nickel Subsidiary Sumitomo Metal Mining's Coral Bay Nickel Corporation in the Philippines experienced a ransomware attack, resulting in the encryption of two servers due to unauthorized access. The company has isolated the affected servers and is working with external specialists to investigate the breach and restore systems. Operations at the Coral Bay Nickel production plant remain unaffected, and production continues as control systems are intact. Sumitomo has disconnected the networks of Coral Bay Nickel and related entities as a precaution. The company anticipates only a limited impact on its financial results for the fiscal year ending March 2026, with a detailed assessment ongoing. The attack highlights the increasing cyber threats faced by commodity producers, although the broader economic factors will ultimately dictate the impact on nickel prices. The incident reflects the operational challenges posed by ransomware in the industrial sector, particularly as companies navigate the complexities of the commodity cycle. 2 sources 49

Extracted Entities

Sumitomo Metal Mining Reports Ransomware Attack at Philippine Nickel Subsidiary

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Extracted Entities

Attack Types (1)

Companies (3)

Countries (1)

MITRE ATT&CK (1)