November 13, 2020
To All Concerned Parties
Company name
Representative

Contact for inquiries

Mitsubishi Materials Corporation
Naoki Ono, Chief Executive Officer(Securities code: 5711, First Section, Tokyo
Stock Exchange)
Yuji Omura, General Manager, Corporate
Communications Dept.
(Tel: +81-3-5252-5206)

Notice Regarding the Submission of Application for the Approval of Extension of Deadline for
Submission of the Second Quarterly Securities Report for the Fiscal Year Ending March 31, 2021
Mitsubishi Materials Corporation (hereinafter referred to as “the Company”) hereby announces that the Company
today decided to submit to the Kanto Local Finance Bureau an application for approval of extension of deadline forsubmission of a quarterly securities report provided in Article 17-15-2, Paragraph 1 of the Cabinet Office Order on
Disclosure of Corporate Affairs, as described below.
The Company extends its sincere apology for causing inconvenience and anxiety to its shareholders, investors andall relevant parties.
1.Relevant Quarterly Securities Report
Second Quarterly Securities Report for the Fiscal Year Ending March 31, 2021 (from July 1, 2020 to September 30,2020)
2. Original deadline
November 16, 2020
3. Submission deadline when the extension is approved
December 16, 2020
4. Reason for requiring the extension of the submission deadline
As described in the “Notice Regarding the Postponement of the Announcement of the Consolidated Financial Results
for the Six Months Ended September 30, 2020” announced on November 2, 2020, at Robertson’s Ready Mix, Ltd.
(hereinafter referred to as “RRM”), RRM Properties, Ltd. and Robertson’s Transport, Ltd. (all of which areconsolidated subsidiaries of the Company located in the United States; hereinafter collectively referred to as“RRMs”), in all of which the Company holds the equity interest through MCC Development Corporation (aconsolidated subsidiary located in the United States in which the Company holds 70% shares; hereinafter referred toas “MCCD”), some senior executives of RRM have engaged in transactions with companies in which such senior
executives have personal interests (hereinafter referred to as the “Case”). Accordingly, MCCD has engaged
independent outside experts who have no interest in MCCD and RRMs to undertake investigations into the facts ofthe Case, including interviews with the parties related the Case, digital forensic investigations and detailed
examinations of the relevant documents such as accounting data. The Company is also conducting investigations
into the Case in cooperation with MCCD, such as the confirmation of the facts related to such transactions and theexistence of similar cases, if any.
The investigations have, so far, revealed some transactions between RRMs and the companies in which the senior
executives of RRM have jointly invested. It will require some time to confirm the adequacy of such transactions andto know whether or not other transactions and so on which have impact on its financial statements exist. Furthermore,taking into consideration the time required for the subsequent work to prepare the quarterly securities report, anywork required as a result of the investigations, and additional procedures for the audit firm to express its conclusions
on the quarterly review, the Company has determined that it will not be able to submit the Second Quarterly Securities
Report for the Fiscal Year Ending March 31, 2021 by November 16, 2020, which is the original submission deadline.
Accordingly, the Company has decided to submit to the Kanto Local Finance Bureau an application for approval ofextension of deadline for submission of the quarterly securities report.
5. ScheduleOnce the application for the extension of the submission deadline is approved, the Company will make a prompt
announcement.

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