
Litigation: Securities
Canada Guide 2026 : Ontario
Rankings

Ranked Individuals
Ranked Individuals
About
Provided by Osler, Hoskin & Harcourt LLP
Osler's Ontario Litigation team works collaboratively with clients to find the best possible outcome for their business needs – whether that be a negotiated settlement or fighting for the issue in court, mediation, or arbitration. Osler regularly participates in hearings before a variety of provincial and federal tribunals, such as the Financial Services Tribunal, the Ontario Municipal Board, the Environmental Assessment Board and the Ontario Securities Commission, as well as representing clients in various forms of alternative dispute resolution.
Chambers Review
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Work Highlights
Provided by Chambers
Osler, Hoskin & Harcourt advised Imperial Tobacco on a claims resolution process within a CCAA restructuring.
Strengths
Provided by Chambers
The lawyers are experts in their field and highly responsive.
Litigation: Securities respondentCanadaThe Osler team has an ability to pool together resources and talent from across areas where multiple complex issues are involved.
Litigation: Securities respondentCanadaThe firm has really great thought leaders with a strong supporting cast around them.
Litigation: Securities respondentCanadaThe team are seasoned, knowledgeable professionals.
Litigation: Securities respondentCanada
Notable Practitioners
Provided by Chambers
Band 1 
Band 1 
Lawrence Ritchie
Toronto-based Lawrence Ritchie is notable for the depth and breadth of his practice in the securities space. He has extensive experience representing clients in litigation stemming from OSC investigations, as well as other regulatory disputes and securities class action suits.
He knows this area well and is commercially aware.
Litigation: Securities respondentCanadaHe is always practical, responsive and has been a great resource for us.
Litigation: Securities respondentCanadaHe is very interested in the policy side of securities litigation and making this space better to work in for everyone.
Litigation: Securities respondentCanadaLarry is a very knowledgeable and experienced lawyer and is a pleasure to work with.
Litigation: Securities respondentCanada
Band 2 
Band 2 
Mark A Gelowitz
Mark Gelowitz has experience handling a broad range of disputes, including those in the technology, insurance, real estate and PE sectors. Based in Osler, Hoskin & Harcourt's Toronto office, he is additionally instructed for his representation in class action proceedings.
He is very capable and client-focused.
Litigation: Securities respondentCanada
Band 4 
Band 4 
Craig Lockwood
Based in Toronto, Craig Lockwood represents clients in securities class actions and OSC investigations, acting for both corporate entities and individual executives. He also has an active product liability practice.
He is able to function across multiple verticals in complex issues.
Litigation: Securities respondentCanadaWe trust Craig with our most complex matters.
Litigation: Securities respondentCanada
Band 5 
Band 5 
Alex Cobb
Alex Cobb boasts a broad commercial litigation practice with a particular focus on securities disputes. He has deep experience in assisting clients with regulatory enforcement matters. He is regularly engaged by clients in the digital asset and cryptocurrency space.
He has a wonderful oral advocacy style.
Litigation: Securities respondentCanada
Band 5 
Band 5 
Robert Carson
Robert Carson has a fast-growing reputation for his securities litigation practice, which includes strengths in both M&A litigation and securities class action defence. He is based in Osler, Hoskin & Harcourt's Toronto office.
Rob is a great litigator but also provides excellent business advice.
Litigation: Securities respondentCanadaHe is strategic and tactical.
Litigation: Securities respondentCanada
Band 5 
Band 5 
Sonia Bjorkquist
National disputes department chair Sonia Bjorkquist is a well-respected practitioner with notable experience handling product liability class actions. She represents her clients from Osler, Hoskin & Harcourt's Toronto office.
She is really smart and makes sure we have the resources we need.
Litigation: Securities respondentCanada
Band 6 
Band 6 
Lauren Tomasich
Lauren Tomasich is based in Osler, Hoskin & Harcourt's Toronto office, where she handles commercial disputes, securities matters, white-collar defence and enforcement proceedings.
She comes up with creative solutions to solve our issues.
Litigation: Securities respondentCanadaShe brings a great deal of comfort to us as she sees issues from a variety of perspectives.
Litigation: Securities respondentCanadaShe is smart and incredibly effective.
Litigation: Securities respondentCanada
Up and Coming 
Up and Coming 
Adam Hirsh
Adam Hirsh specialises in representing Canadian and global corporate clients in commercial litigation. He is experienced in all types of commercial disputes, as well as boasting a robust class actions practice.
Adam has always been keen to understand our business so that he and his team can support us in all facets required.
Litigation: Securities respondentCanada
Ranked Individuals at Osler, Hoskin & Harcourt LLP (8)
Members
Provided by Osler, Hoskin & Harcourt LLP

Sonia Bjorkquist
View profile of Sonia Bjorkquist
Mark A Gelowitz
View profile of Mark A Gelowitz
Craig Lockwood
View profile of Craig Lockwood
Lauren Tomasich
View profile of Lauren Tomasich
Robert Carson
View profile of Robert Carson
Adam Hirsh
View profile of Adam Hirsh
Alex Cobb
View profile of Alex Cobb
Lawrence Ritchie
View profile of Lawrence Ritchie
Osler, Hoskin & Harcourt LLP has rankings in the following guides
Band 2 Canada 2026
Practice area: Litigation: General Commercial
Location: Alberta
View department profile for Canada 2026Band 3 Canada 2026
Practice area: Litigation: General Commercial
Location: Nationwide - Canada
View department profile for Canada 2026Band 3 Canada 2026
Practice area: Litigation: General Commercial
Location: Québec
View department profile for Canada 2026
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