Toho Zinc Co.,Ltd. — Proxy Solicitation & Information Statement 2026

Jun 2, 2026

Note: This document has been translated from the Japanese original for reference purposes only. In the event of any discrepancy between this translated document and the Japanese original, the original shall prevail.

FASF
MONBURGH

June 2, 2026

Company name: Toho Zinc Co., Ltd.
Name of representative: ITO, Masahito, President and Representative Director
(Securities code: 5707)
Inquiries: SATO, Yoshikazu, Director, Managing Executive Officer
(Telephone: +81-3-4334-7316)

Notice Regarding the Partial Amendment to the Articles of Incorporation

The Company hereby announces that, at a meeting of the Board of Directors held today, it resolved to submit a proposal for a partial amendment to the Articles of Incorporation at the 127th Ordinary General Meeting of Shareholders scheduled to be held on June 26, 2026, as announced in "Notice Regarding the Change of Trade Name Based on Transformation of Business Structure" dated April 7, 2026.

1. Reason for the amendment

The Company was established in 1937 as Japan Zinc Smelting Co., Ltd., and has been operating primarily in its founding business of zinc and lead smelting since changing its trade name to Toho Zinc Co., Ltd. in 1941.

However, in the Business Revitalization Plan announced in December 2024, the Company has been promoting a transformation of its business portfolio, including, including the restructuring of the Zinc Smelting Business. At the same time, the Company is striving to transform its business foundation into a new one built around the Metal Business centered on lead and silver, the Recycling Business, and the Functional Materials and Electronic Components Business.

As the Company's business structure undergoes significant change, it has repeatedly engaged in extensive discussions primarily among management and with the participation of employees, regarding the appropriateness of continuing to use "Zinc" in the Company's name and its future direction for sustainable profit growth, while taking into account the progress of the business portfolio review.

As a result, the Company has determined that changing its name to one that appropriately represents its current and future business domains, covering a wide range of metals from base metals to rare metals and precious metals, as well as operations ranging from smelting to recycling, will contribute to the sustainable enhancement and creation of the Company's corporate value. Accordingly, the Company has decided to amend Article 1 (Trade Name) of its Articles of Incorporation, thereby clearly showing the Company's determination to move away from its conventional business structure and transition to a new stage of growth.

Furthermore, this amendment will be effective as of April 1, 2027. A supplementary provision to that effect will be established, and the supplementary provision will be deleted after the effective date.

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1. Details of the amendment

The details of the amendment are as follows. (Amended sections are underlined)

Current Articles of Incorporation	Proposed Amendments
(Trade Name)
Article 1 The trade name of the Company shall be “東邦亜鉛株式会社” in Japanese and “Toho Zinc Co., Ltd.” in English.

| (Trade Name)
Article 1 The trade name of the Company shall be “東邦メタリクス株式会社” in Japanese and “Toho Metalix Co., Ltd.” in English.

Supplementary Provisions
3. The amendment to Article 1 (Trade Name) shall be effective as of April 1, 2027. This supplementary provision shall be deleted after the effective date of the change of trade name. |

1. Main schedule

June 26, 2026 (scheduled) Date of the Ordinary General Meeting of Shareholders for the amendment to the Articles of Incorporation

April 1, 2027 (scheduled) Effective date of the amendment to the Articles of Incorporation