

Partner at Osler, Hoskin & Harcourt LLP
Teresa M. Tomchak is a distinguished partner in the Disputes Group at Osler, Hoskin & Harcourt LLP’s Vancouver office, bringing over 20 years of extensive legal experience to her clients. Her practice is highly focused on securities litigation and regulation, where she provides seasoned counsel and advocacy in complex matters including shareholder disputes, hostile takeover bids, proxy fights, and contested plans of arrangement. Teresa also specializes in the defence of securities class actions.
Teresa’s notable expertise extends to all aspects of securities regulatory matters, representing clients before various provincial securities commissions. Her experience covers investigations and enforcement hearings involving allegations such as insider trading, illegal distributions, market manipulation, discretionary trading, suitability matters, and fraud. She routinely advises on registration requirements under securities legislation relating to trading in securities.
Frequently, Teresa advises special committees during transactions and internal investigations, including handling whistleblower complaints. Her skills also encompass advising financial institutions and investment advisors, with recognized strength in broker-dealer litigation. Prior to joining Osler, Teresa was a partner at a leading regional law firm, adding further depth to her versatile legal practice.
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