Constellation Software stock falls after founder resigns for health reasons

Published 25/09/2025, 16:22
© Reuters

Investing.com -- Constellation Software Inc . (TSX:CSU) stock fell 5.7% on Thursday after the company announced that founder and President Mark Leonard has resigned from his position for health reasons, effective immediately. Chief Operating Officer Mark Miller has been appointed as the new President by the Board of Directors.

Leonard, who founded Constellation in 1995, will remain as a Director on the Board. Miller, who has been with the company for over 30 years, will maintain his other roles within the organization while taking on the presidency.

The leadership change comes as a surprise to investors, with the stock declining despite assurances of continuity from the company’s management. John Billowits, Chairman of the Board, expressed wishes for Leonard’s "full and swift recovery" while acknowledging his "visionary leadership, humility and wisdom."

BMO Capital Markets analyst Thanos Moschopoulos called Leonard "irreplaceable," noting that however, "In our view, we believe CSU’s highly decentralized structure and bench strength should mitigate the impact associated with this transition."

Jefferies analyst Samad Samana also commented, saying, "While the news would have been concerning no matter the circumstances, investors are particularly spooked given CSU could have disclosed the info on its 9/22 AI update call. The timing raises the question of whether the uncertainty following the call influenced the decision. While CSU’s deep management bench should allow for a smooth transition, the uncertainty will likely weigh on the stock."

In a statement, Leonard expressed confidence in Miller and the executive team’s ability to execute Constellation’s business plan.

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