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Corporate and Securities Disputes

securities stock market board numbers

Osler’s litigators have extensive experience representing public and private clients of all sizes in corporate governance, mergers and acquisitions and securities matters before the courts and provincial securities commissions.

We have been at the forefront of the development of legal principles governing a number of critical aspects of modern corporate law. As a result, we are intimately familiar with the potential risks involved in pursuing a course of action and can advise on the best approach to dealing with a litigious matter.

We work closely with our colleagues in related groups to provide comprehensive representation of our clients in Canada and cross-border. Our lawyers have advised and represented clients in corporate governance and securities litigation matters related to:

  • Corporate finance proceedings commenced under a variety of business statutes including the federal and provincial Business Corporations Acts and the provincial Securities Acts;
  • Securities class actions based on alleged misrepresentations contained in prospectuses, financial statements and other public disclosure documents;
  • Directors’ duties in hostile and friendly take-over bids;
  • Defending corporations in U.S.-style “strike” suits;
  • Directors’ personal liability for conduct undertaken on behalf of the corporation;
  • Shareholders’ rights;
  • Oppression remedy;
  • Dissent remedy and appraisal;
  • Derivative actions by shareholders;
  • Disputes in mergers and acquisitions;
  • “Poison pill” disputes.

Key Contacts

Mark A. Gelowitz

Partner, Disputes, Toronto

Craig Lockwood

Partner, Disputes, Toronto

Lawrence E. Ritchie

Partner, Disputes, Toronto

Teresa Tomchak

Partner, Disputes, Vancouver


Representative Work


Latest Insights

  • Blog Jul 15, 2024

    B.C. Securities Commission issues first administrative penalty under new regime

    On November 17, 2023, the B.C. Securities Commission (the BCSC) issued a $12,000 administrative penalty to Capstone Asset Management Inc. (Capstone)...

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    B.C. Securities Commission issues first administrative penalty under new regime
  • Blog Mar 27, 2024

    Bill 149 receives royal assent

    Ontario’s Bill 149, which imposes new requirements regarding pay transparency, Canadian work experience and the use of AI in job postings, has...

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    Bill 149 receives royal assent
  • Osler Update Mar 11, 2024

    Ontario Capital Markets Tribunal clarifies considerations for a private placement in the face of an unsolicited takeover bid in Aimia

    The OSC has provided helpful guidance in assessing whether a private placement undertaken in the face of a take-over bid is an improper defensive...

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    Ontario Capital Markets Tribunal clarifies considerations for a private placement in the face of an unsolicited takeover bid in Aimia
  • Blog Feb 7, 2024

    OSC settles allegations relating to cryptocurrency tokens

    In a first, Ontario’s Capital Markets Tribunal has approved a settlement agreement related to the promotion and sale of cryptocurrency tokens....

    Read more
    OSC settles allegations relating to cryptocurrency tokens
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Awards and Recognition

  • Chambers Canada: Canada’s Leading Lawyers for Business: Recognized in Litigation: Securities (Ontario) (Band 1)
  • The Canadian Legal Lexpert Directory: Recognized in Litigation – Securities (Toronto, Ontario)
  • Benchmark Litigation Canada Awards: Securities, Firm of the Year, Shortlisted (2019)

In the Media

  • Media Mentions Jan 19, 2024

    Top 10 business decisions of 2023 – Law360 Canada

    Last year, in two sister cases, the Ontario Court of Appeal set out a two-step analysis to determine the meaning of “material change” within the...

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  • Media Mentions Jan 5, 2024

    Lawrence Ritchie retires from FSRA Board

    Lawrence Ritchie has retired from the Financial Services Regulatory Authority of Ontario (FSRA) Board of Directors. He joined the newly-formed Board...

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  • Osler News Apr 3, 2023

    Teresa Tomchak joins Osler’s Litigation practice in Vancouver

    We welcome Teresa Tomchak to Osler’s Litigation team in Vancouver. Teresa’s practice is focused on securities litigation and regulation, as well...

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  • Osler News Nov 23, 2022

    Lauren Tomasich and Colena Der named 2022 Lexpert Rising Stars

    Congratulations to Osler partners Lauren Tomasich and Colena Der on being named Lexpert Rising Stars for 2022! The awards recognize emerging leaders...

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