Mountain Province Diamonds Inc. — Proxy Solicitation & Information Statement 2024

Apr 12, 2024

April 12, 2024

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100 University Avenue, 8th floor Toronto ON, M5J 2Y1 www.computershare.com

To: All Canadian Securities Regulatory Authorities

Subject: MOUNTAIN PROVINCE DIAMONDS INC.

Dear Sir/Madam:

We advise of the following with respect to the upcoming Meeting of Security Holders for the subject Issuer:

Meeting Type : Annual General Meeting Record Date for Notice of Meeting : May 07, 2024 Record Date for Voting (if applicable) : May 07, 2024 Beneficial Ownership Determination Date : May 07, 2024 Meeting Date : June 19, 2024 Meeting Location (if available) : Virtual Meeting Issuer sending proxy related materials directly to NOBO: Yes Issuer paying for delivery to OBO: Yes

Notice and Access (NAA) Requirements:

NAA for Beneficial Holders Yes Beneficial Holders Stratification Criteria: Not Applicable NAA for Registered Holders Yes Registered Holders Stratification Criteria: Not Applicable

Voting Security Details:

Description CUSIP Number ISIN COMMON SHARES 62426E402 CA62426E4022

Sincerely,

Computershare

Agent for MOUNTAIN PROVINCE DIAMONDS INC.