Constellation Software Inc. — Proxy Solicitation & Information Statement 2026

Apr 9, 2026

C

CONSTELLATION

SOFTWARE

INC.

Have questions about this notice? Call the Toll Free Number below or scan the QR code to find out more

Toll Free 1-866 964-0492

www.computershare.com/noticeandaccess

Notice of Availability of Proxy Materials for Constellation Software Inc. Annual Meeting

Meeting Date and Location:

When: May 15, 2026
8:30 a.m. (Eastern Time)

Where: Online at https://meetnow.global/MMT5Q4H
In person at Delta Hotels Toronto, 75 Lower Simcoe Street, Toronto, Ontario, M5J 3A6

You are receiving this notice to advise that the proxy materials for the above noted securityholders' meeting are available on the Internet. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We remind you to access and review all of the important information contained in the information circular and other proxy materials before voting.

Constellation Software Inc. will not use procedures known as 'stratification' in relation to the use of notice-and-access provisions. Stratification occurs when an issuer using notice-and-access provisions sends a paper copy of the proxy materials to some securityholders.

The information circular and other relevant materials are available at:

www.csisoftwared.com

OR

www.sedarplus.ca

How to Obtain Paper Copies of the Proxy Materials

Securityholders may request to receive paper copies of the current meeting materials by mail at no cost. Requests for paper copies may be made using your Control Number as it appears on your enclosed Voting Instruction Form or Proxy. To ensure you receive the materials in advance of the voting deadline and meeting date, all requests must be received no later than May 1, 2026. If you do request the current materials, please note that another Voting Instruction Form/Proxy will not be sent; please retain your current one for voting purposes.

For Holders with a 15 digit Control Number:

Request materials by calling Toll Free, within North America - 1-866-962-0498 or direct, from Outside of North America - (514) 982-8716 and entering your control number as indicated on your Voting Instruction Form or Proxy.

To obtain paper copies of the materials after the meeting date, please contact Jamal Baksh by calling 416-861-9677 or emailing jbaksh@csisoftware.com.

For Holders with a 16 digit Control Number:

Request materials by calling Toll Free, within North America - 1-877-907-7643 or outside of North America - 303-562-9305.

To obtain paper copies of the materials after the meeting date, please contact Jamal Baksh by calling 416-861-9677 or emailing jbaksh@csisoftware.com.

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Securityholder Meeting Notice

The resolutions to be voted on at the meeting are listed below along with the Sections within the Information Circular where disclosure regarding the matter can be found.

1. Appointment of Auditors - See the Section entitled "Appointment of Auditors" beginning on page 20 of the Information Circular
2. Election of Directors - See the Section entitled "Election of Directors" beginning on page 20 of the Information Circular
3. Advisory Vote on Executive Compensation - See the Section entitled "Approach to Executive Compensation" beginning on page 25 of the Information Circular

Voting

PLEASE NOTE - YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your securities you must vote using the methods reflected on your enclosed Voting Instruction Form or Proxy. Your Voting Instruction Form or Proxy must be received by 8:30 a.m. Eastern Time on May 13, 2026.

PLEASE VIEW THE INFORMATION CIRCULAR PRIOR TO VOTING

Annual Financial statement delivery

• Only Registered and Beneficial holders who opted to receive one

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