AGM June 19, 20201500 Robert-Bourassa Blvd., 7th FloorMontrealQC, H3A 3S8www.computershare.comTo: All Canadian Securities Regulatory AuthoritiesSubject: 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 MeetingRecord Date for Notice of Meeting :July 15, 2020Record Date for Voting (if applicable) :July 15, 2020Beneficial Ownership Determination Date :July 15, 2020Meeting Date :August 19, 2020Meeting Location (if available) :Virtual MeetingIssuer sending proxy related materials directly to NOBO:YesIssuer paying for delivery to OBO:YesNotice and Access (NAA) Requirements:NAA for Beneficial HoldersNoNAA for Registered HoldersNoVoting Security Details:DescriptionCUSIP NumberISINSUBORDINATED VOTING SHARES265282202CA2652822024