TMX Group Limited — Proxy Solicitation & Information Statement 2025

Apr 7, 2025

TMX THE FUTURE IS YOURS TO SEE.

TSX TRUST COMPANY

VIA ELECTRONIC TRANSMISSION

April 7, 2025

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 April 4, 2025 to the Registered Securityholders and to the ESPP Holders:

1. Proxy with Notice-and-Access Notice and Request for Financial Statements - Registered Securityholders - 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 ESPP Holders - English
4. Formulaire d'instructions de vote avec notification et accès et demande d'états financiers - ESPP Holders - French
5. Notice of Meeting Combined with Information Circular Registered Securityholders - English
6. Avis de convocation et circulaire d'information de la direction - Registered Securityholders - French
7. Virtual Meeting Guide Form - Registered Securityholders - English
8. Guide de participation à l'assemblée virtuelle - Registered Securityholders - French
9. Proxy Return Envelope

Yours truly,

TSX Trust Company

VANCOUVER

650 West Georgia Street, Suite 2700

Vancouver, BC V6B 4N9

T 604 689-3334

CALGARY

300-5th Avenue SW, 10th floor

Calgary, AB T2P 3C4

T 403 218-2800

TORONTO

301-100 Adelaide Street West

Toronto ON M5H 4H1

Toll Free 1-866-600-5869

T 416 361-0930

MONTRÉAL

1800-1190, avenue des

Canadiens-de-Montréal, C. P. 37

Montréal (Québec) H3B 0G7

T 514 395-5964