Dundee Sustainable Technologies Inc. — Proxy Solicitation & Information Statement 2026

Apr 10, 2026

April 10, 2026

Computershare
650 boulevard De Maisonneuve ouest,
7e étage
Montreal (Québec), H3A 3T2
www.computershare.com

To: All Canadian Securities Regulatory Authorities

Subject: DUNDEE SUSTAINABLE TECHNOLOGIES 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 and Special Meeting
Record Date for Notice of Meeting : April 30, 2026
Record Date for Voting (if applicable) : April 30, 2026
Beneficial Ownership Determination Date : April 30, 2026
Meeting Date : June 04, 2026
Meeting Location (if available) : Quebec QC
Issuer sending proxy related materials directly to NOBO: Yes
Issuer paying for delivery to OBO: No

Notice and Access (NAA) Requirements:

NAA for Beneficial Holders: No
NAA for Registered Holders: No

Voting Security Details:

Description	CUSIP Number	ISIN
SUBORDINATED VOTING SHARES	265282202	CA2652822024

Sincerely,

Computershare

Agent for DUNDEE SUSTAINABLE TECHNOLOGIES INC.