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Constellation Software founder Mark Leonard resigns, shares extend recent plunge after investor pressure

  • Mark Leonard resigned immediately as President of Constellation Software Inc. on Thursday due to health reasons.
  • Leonard founded Constellation in 1995 and stepped down after building it through acquiring niche software companies, amid questions about AI-related success.
  • Shortly after trading began on the Toronto Stock Exchange, the company's shares fell sharply but later regained some of their value during the session.
  • Mark Miller, who has dedicated 30 years to Constellation and previously served as Chief Operating Officer, was named President and expressed confidence that the company is well-equipped to maintain its progress moving forward.
  • Leonard will remain on Constellation's Board of Directors, suggesting leadership continuity despite his executive departure amid stock volatility.
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Constellation Software shares sank on Thursday to 19.4% on the Canadian Stock Exchange after the decision of its founder, Mark Leonard, to leave the presidency, on health grounds. The so-called ‘Gandalf of the Stock Exchange’ will continue on the firm’s board of directors. Continue reading

·Spain
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Constellation Software president Mark Leonard resigns for health reasons

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

·Canada
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ParrySound.com broke the news in on Thursday, September 25, 2025.
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