Mark Sheeley

Mark Sheeley

Associate, Litigation

Key Contact: Case assessment at Osler

Contact Information

tel: 416.862.6791



Bar Admission

Ontario, 2014


  • Osgoode Hall Law School, J.D.
  • University of Western Ontario, M.A.
  • University of Victoria, B.Sc. (Hons.) (With Distinction)



Mark has a wide-ranging corporate-commercial litigation practice, with expertise in complex class action litigation and matters relating to securities, tax, insolvency, administrative law and internal investigations.

Mark is committed to client service, identifying and obtaining practical results that meet his clients’ objectives, whether in the courtroom or the boardroom. He has appeared before the Ontario Superior Court of Justice, Divisional Court, Supreme Court of British Columbia, Court of Appeal for British Columbia, Ontario Securities Commission, Tax Court of Canada and Federal Court of Appeal.

  • TerraFarma

    TerraFarma in its up to $68 million acquisition by Aurora Cannabis

    • Cameco Corporation, in the precedent-setting trial of a transfer pricing dispute in the Tax Court of Canada relating to Cameco’s international sales structure, and the subsequent appeal to the Federal Court of Appeal.
    • Loblaw Companies Limited, in the precedent-setting trial of a tax dispute in the Tax Court of Canada relating to Loblaw’s international financial affiliate, and the subsequent successful appeal to the Federal Court of Appeal.
    • Canada Bread Company Limited, in an application for a stay of a decision of the Ontario Labour Relations Board.
    • Amex Bank of Canada, in a class action relating to prepaid financial products before the Supreme Court of British Columbia and Court of Appeal for British Columbia.
    • A multinational auto manufacturer, in regulatory investigations regarding emissions.
    • A secured creditor, in its successful application to obtain protection for a debtor under the Companies’ Creditors Arrangement Act before the Commercial List.
    • Magna International, in various commercial disputes.
    • NEC Corporation, in several competition class actions across Canada.
    • A Canadian financial institution, in a regulatory investigation and settlement.
  • Find More

  • Top Appellant at the 2013 Bowman Tax Moot
  • Winner of the 2012 International Competition in Mediation Advocacy
  • Recipient of the Blake, Cassels & Graydon LLP Award, the Davies Ward Phillips & Vineberg LLP Award in Commercial Law, Business Associations and Tax, and the Borden Ladner Gervais LLP Professional Excellence Award 

  • Osgoode Hall Mooting Society, Treasurer
  • Woodgreen Debt Clinic, Debt Advisor

  • Ontario Bar Association
  • Canadian Bar Association
  • Law Society of Ontario