Pierre Y. Lefebvre

Lawyer, Partner - Montréal

Québec Bar 1982
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Pierre Y. Lefebvre is a partner in the Montréal office of Langlois Lawyers. He is a seasoned litigator with over 25 years’ experience. Over the years, he has managed large, complex and highly-mediatised cases from all practice areas, including corporate law, securities and shareholder disputes. With the class action “boom”, he has worked in Quebec and Canada on commercial law, product liability and consumer law cases.

Pierre has chaired a number of lengthy trials during the course of his practice and knows how to manage extremely voluminous cases. He has litigated before the courts at all levels, including the Supreme Court of Canada, and has acted before many administrative tribunals, including the Financial Markets Administrative Tribunal and arbitration tribunals. He was inducted into the Fellowship of the American College of Trial Lawyers.


B.C.L., McGill University, 1982


Representative Work

Real estate litigation and expropriation
Represented Rogers Communications in a lawsuit against the Coty of Châteauguay that culminated in a Supreme Court of Canada decision confirming the federal parliament’s exclusive jurisdiction over telecommunications, including the location for the installation of cell phone system antennae.

Securities litigation
Represented Theratechnologies Inc. all the way to the Supreme Court of Canada in defence against a class action alleging a failure to disclose a material change in the corporation’s operations. The action was ultimately dismissed and the criteria for the authorization of class proceedings under the Securities Act were tightened.

Represented Christophe Izard, France-Animation, Ravensburger et al. in the Cinar v. Robinson case in which the Supreme Court of Canada clarified the concept of infringement and expounded on the meaning of “reproduction of a substantial part of a work”.

Class actions
Represented several enterprises in the telecommunications and retail sales fields in connection with the application of the Consumer Protection Act.

Shareholder disputes
Represented both majority and minority shareholders in lawsuits of a commercial nature or alleging oppression.




Other Publications

2016 – “The chilling effect of the Supreme Court of Canada’s decision in Theratechnologies”, Benchmark Canada, April 2016.

2016 – “The power of the courts to order an investigation in oppression situations: a powerful weapon … to be used sparingly” (Le pouvoir des tribunaux d’ordonner une enquête en matière d’oppression: une arme puissante… mais d’exception), February 18, 2016.

2015 – “Theratechnologies’ victory at the Supreme Court of Canada was a victory for all public companies” (Victoire de Theratechnologies devant la Cour suprême du Canada : une victoire pour l’ensemble des sociétés publiques), co-author, April 17, 2015.

2015 – “The Supreme Court of Canada will decide who has the ultimate say in the location for a radio-communications tower” (La Cour Suprême du Canada décidera qui détient l’autorité ultime pour désigner l’emplacement d’une tour de radiocommunication)”, co-author, March 2, 2015

2013 – “The Quebec Court of Appeal specifies the pre-authorization criteria for actions alleging liability on the secondary market (s. 225.4 of the Securities Act)” (La Cour d’appel précise les critères visant les autorisations préalables aux actions relatives à la responsabilité dans le marché secondaire (art. 225.4 de la Loi sur les valeurs mobilières)), Canadian Securities Law News, Wolters Kluwer, August 2013.



2018 – Presentation on how to prepare a witness for a pre-trial examination, Maîtrisez L’interrogatoire Préalable – Learn how to make the most of the discovery process, The Advocates’ Society, Montréal, April 13, 2018

2016 – Co-presenter, “Class actions – Are the Sibiga and Boiron decisions the final nail in the coffin?”, Montréal, November 23, 2016

2016 – Co-presenter, “Impacts of the new Code of Civil Procedure on dispute resolution methods”, Montréal January 20, 2016 

2015 – Co-presenter, Annual get-together of securities lawyers in Quebec organized by the legal advisory committee of the Autorité des marchés financiers, Mont-Tremblant, November 4-6, 2015.

2015 – “The state of class action law in Quebec”, presentation to Rogers Communications Inc., Toronto, September 9, 2015

2014 – “The authorization criterion under section 225.4 of Quebec’s Securities Act” 11th National Symposium on Class Actions, Osgoode Hall Law School, Toronto, April 24-25, 2014

2013 – “Bill 198 and other recent Canadian developments in D&O claims”, Plus Canada, Montréal”, May 30, 2013

Professional Associations

Since 1982 – Member of The Bar of Montréal

Since 1982 – Member of the Canadian Bar Association

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