Constellation Software president Mark Leonard resigns for health reasons

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TORONTO - Constellation Software Inc. says founder Mark Leonard has resigned as president of the company for health reasons, effective immediately. 

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Hey there, time traveller!
This article was published 25/09/2025 (182 days ago), so information in it may no longer be current.

TORONTO – Constellation Software Inc. says founder Mark Leonard has resigned as president of the company for health reasons, effective immediately. 

The company says Mark Miller, who is currently chief operating officer, has been appointed president. 

Leonard will remain as a director on the board, while Miller’s other roles within Constellation will remain unchanged.

A man uses a computer keyboard in Toronto in this Sunday, Oct. 9 photo illustration. THE CANADIAN PRESS/Graeme Roy
A man uses a computer keyboard in Toronto in this Sunday, Oct. 9 photo illustration. THE CANADIAN PRESS/Graeme Roy

Leonard says he and the board have complete confidence in Miller and the executive team.

He added that Miller has been a trusted adviser and a driving force within Constellation’s executive leadership team.

Leonard founded Constellation in 1995 after working in the venture capital business for 11 years.

This report by The Canadian Press was first published Sept. 25, 2025.

Companies in this story: (TSX:CSU)

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