Skip To Content
Lauren  Tomasich

Lauren Tomasich

Partner, Litigation

Contact Information

tel: 416.862.6434



Bar Admission

Ontario, 2008

  • Osgoode Hall Law School, LL.B.
  • University of Calgary, B.A. (with distinction)

Lauren practises corporate-commercial civil litigation, with particular emphasis on class actions defence, securities litigation and product liability matters.

Lauren represents various companies facing class actions in a variety of circumstances, including claims of environmental property damages, securities, product liability and pensions and benefits. She has experience at all stages of a class proceeding, including certification motions, various procedural motions, and recently in a large common issues trial and appeal.

Lauren’s practice involves expedited hearings before the Ontario Securities Commission, oppression claims and corporate governance matters. She has experience with complex product liability cases, and has assisted companies with such claims in a multi-jurisdictional context. Lauren also has experience with international commercial arbitration.

Lauren has appeared at all levels of court in Ontario, and has spent some time with Osler’s Calgary office, during which time she appeared before the Alberta courts. She joined Osler as a summer student in 2006 and returned to article with the firm in 2007. During her articles, Lauren was seconded to the enforcement branch of the Ontario Securities Commission.

    • Vale (Inco) Limited in a class action trial, and the successful appeal of the trial decision (leave to appeal to the Supreme Court of Canada denied). Lauren also acted on various motions before, during and after the common issues trial including a decertification motion, a motion to disqualify one of the plaintiff’s expert witnesses, and a motion to amend the common issues subsequent to the close of trial.
    • The Canada Mortgage and Housing Corporation in class proceedings dealing with pension surplus and plan amendments, involving complex procedural issues.
    • General Motors of Canada Inc. in class proceedings brought on behalf of a group of former employees in respect of their entitlement to pension benefits following their change of employment.
    • Magna International Inc. in opposing the application before the Ontario Securities Commission, brought by Staff of the OSC and intervening institutional shareholders in opposition to the company’s dual-class share capital reorganization.
    • Merrill Lynch Canada in a proposed class action alleging mismanagement of client accounts.
    • A large global manufacturer of water treatment facilities in a complex multi-jurisdictional product liability case involving many parties.
    • A large international mining company in respect of various claims arising from the construction of a large-scale nickel processing facility

  • Law Help Ontario, Pro Bono Law Ontario, Duty Counsel Volunteer
  • SickKids Innovator

  • Canadian Bar Association
  • Ontario Bar Association
  • Law Society of Upper Canada
  • Advocates’ Society
  • Young Canadian Arbitration Practitioners (YCAP)

  • Ontario overtime class actions: A map for certification? (L. Fric and L. Tomasich), Canadian Employment Law Today, Mar 20, 2015.
  • Re-Arranging the Arrangement Landscape: The Implications of Re Magna International Inc. (C. Lockwood and L. Tomasich), Canadian Bar Review, Vol. 89, No. 3.