TMX Group Limited — Proxy Solicitation & Information Statement 2023

Mar 31, 2023

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TSX TRUST COMPANY

VIA ELECTRONIC TRANSMISSION

March 31, 2023

TO ALL APPLICABLE EXCHANGES AND COMMISSIONS:

RE: TMX GROUP LIMITED

We are pleased to confirm that copies of the following proxy-related materials were mailed on March 30, 2023 to the Registered Securityholders, to the Non-Objecting Beneficial Owners ("NOBO") and to the ESPP Holders:

• 1 Proxy with Notice-and-Access Notice and Request for Financial Statements - Registered Shareholders - English

• 2 Formulaire de procuration avec notification et accès et demande d’états financiers - Registered Securityholders - French

• 3 Voting Instruction Form with Notice-and-Access Notice and Request for Financial Statements - NOBOs and ESPP Holders - English

• 4 Formulaire d'instructions de vote avec notification et accès et demande d'états financiers - NOBOs and ESPP Holders- French

• 5 Notice of Meeting Combined with Information Circular

Registered Securityholders and NOBOs Requesting Full Package - English

• 6 Avis de convocation et circulaire d'information de la direction -

Registered Securityholders and NOBOs Requesting Full Package - French

7 Proxy Return Envelope

Yours truly,

TSX Trust Company

''Steven Nguyen'' Senior Manager Steven.Nguyen@tmx.com

VANCOUVER CALGARY TORONTO MONTRÉAL 650 West Georgia Street, 300-5th Avenue SW, 10th floor 301 - 100 Adelaide Street West 1800 - 1190, avenue des Suite 2700 Calgary, AB T2P 3C4 Toronto ON M5H 4H1 Canadiens-de-Montréal, C. P. 37 Vancouver, BC V6B 4N9 Montréal (Québec) H3B 0G7 Toll Free 1-866-600-5869 T 604 689-3334 T 403 218-2800 T 416 361-0930 T 514 395-5964