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Changes in Officers4008Sumitomo Seika Chemicals Company,Limited.Materials and Chemicals

Changes in Directors

At the annual general meeting of shareholders on 29 June, the company will submit proposals to appoint Tanaka Yoshiyuki (田中 能之) as a director and Yamato Kazushi (山戸 一司) and Yoshimoto Akiko (吉本 明子) as directors who are Audit and Supervisory Committee Members. Yamaguchi Hijiri (山口 聖), a director who is an Audit and Supervisory Committee Member, will resign for personal reasons at the conclusion of the meeting.

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Who is moving to which position

Resolved 12 May 2026

Incoming appointee

3 items
Scheduled Appointment Date29 June 2026 (subject to approval at the 113th Annual General Meeting of Shareholders)
Tanaka Yoshiyuki (田中 能之)
Previous positionSpecial Adviser and Consultant, DSS Sustainable Solutions Japan (currently serving)
New positionDirector (not an Audit and Supervisory Committee Member)
生年月日 26 February 1958入社年 Not disclosed
Yamato Kazushi (山戸 一司)
Previous positionGeneral Manager, Audit and Supervisory Committee Office of the Company (currently serving)
New positionDirector (Audit and Supervisory Committee Member), full-time
生年月日 5 November 1965入社年 2025
Yoshimoto Akiko (吉本 明子)
Previous positionCurrent director who is not an Audit and Supervisory Committee Member
New positionDirector (Audit and Supervisory Committee Member), independent outside director
生年月日 Not disclosed入社年 Not disclosed

Departing officer

1 item
Date of departure29 June 2026 (at the conclusion of the 113th Annual General Meeting of Shareholders)
Yamaguchi Hijiri (山口 聖)Next role stated
Former PositionDirector (Audit and Supervisory Committee Member)
New positionResignation

“Next role stated” means the document names the position the person holds after stepping down. It does not necessarily mean they are leaving the company.

Reason for departure

Personal reasons

Whether the incumbent will remain in office (whether they will retain their position)

Will not remain on the Board of Directors

Directors after the change10Number
Shareholders’ meeting approvalRequired. Proposals to appoint candidates for directors who are not Audit and Supervisory Committee Members and directors who are Audit and Supervisory Committee Members will be submitted to the 113th Annual General Meeting of Shareholders, to be held on 29 June 2026.
Who is moving to which position
ItemDetails
Resolution date12 May 2026
Scheduled Appointment Date29 June 2026 (subject to approval at the 113th Annual General Meeting of Shareholders)
Date of departure29 June 2026 (at the conclusion of the 113th Annual General Meeting of Shareholders)
Name of appointeeTanaka Yoshiyuki (田中 能之), Yamato Kazushi (山戸 一司), Yoshimoto Akiko (吉本 明子)
Appointee's new positionDirector (not an Audit and Supervisory Committee Member), Director (Audit and Supervisory Committee Member), full-time, Director (Audit and Supervisory Committee Member), independent outside director
Appointee's previous positionSpecial Adviser and Consultant, DSS Sustainable Solutions Japan (currently serving), General Manager, Audit and Supervisory Committee Office of the Company (currently serving), Current director who is not an Audit and Supervisory Committee Member
Appointee's date of birth26 February 1958, 5 November 1965, Not disclosed
Year the appointee joined the CompanyNot disclosed, 2025, Not disclosed
Name of departing officerYamaguchi Hijiri (山口 聖)
Former position of departing officerDirector (Audit and Supervisory Committee Member)
New position of departing officerResignation
Reason for departurePersonal reasons
Whether the incumbent will remain in officeWill not remain on the Board of Directors
Number of directors after the change10 directors (including 4 outside directors)
Subject to Approval by the General Meeting of ShareholdersRequired. Proposals to appoint candidates for directors who are not Audit and Supervisory Committee Members and directors who are Audit and Supervisory Committee Members will be submitted to the 113th Annual General Meeting of Shareholders, to be held on 29 June 2026.
Items this document does not state (6)
Number of shares held by the appointeeReason for changeReasons for appointmentFiling as an independent officerDetails of organizational changesChange in Corporate Governance Structure

These are items the company does not state in this document. We do not leave them blank, nor fill them in from other sources or by inference.

The reasons the company gives

The company's own explanation, not something inferred from the numbers.

Yamaguchi Hijiri (山口 聖) will resign for personal reasons. The company has not stated individual reasons for the other personnel changes.

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Corrections happenIf the company reissues this disclosure, the page is rebuilt from the corrected version and the revision number moves up.
Changes in Directors | Sumitomo Seika Chemicals Company,Limited. (4008) timely disclosure | Komori