SHINHAN FINANCIAL GROUP CO LTD (SHG) Form 6-K — Oct 1, 2026

Shinhan Financial Group disclosed that an external party accessed certain Shinhan Bank services and obtained customer information. The Bank initiated a security review, engaged external cybersecurity experts, and is conducting a joint investigation with relevant authorities into the cause and scope of the unauthorized access. The company stated it cannot yet reasonably quantify the impact on its financial condition, results of operations, or business activities, and is continuing to assess the breach. Shinhan Bank is reviewing its information security framework, strengthening security policies, and expanding employee cybersecurity training.

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