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CarolineBiron, ASC

Biron, ASC

Member of the Quebec Bar since 1992

Languages: French, English

Managing Partner of the firm, Mtre. Biron has practiced as a litigator and represented clients before the Supreme Court of Canada, all Québec and federal tribunals as well as regulatory bodies and administrative tribunals, since 1992, when she was admitted to the Québec Bar. She has also been involved in a number of arbitrations. Recognized as an outstanding counsel, she has led successfully complex proceedings from inception through trial. She focuses on commercial and corporate litigation involving M&A transactions, commercial contracts, investments, civil fraud cases, shareholder disputes and class actions. She also has considerable experience in matters of professional liability (including directors’ and officers’ liability) and in litigation involving financial institutions, injunctions and defamation. She is a skilled advocate, recognized for her strategic mind and her professional ethics, and a committed mentor to younger lawyers.






Represented before the Supreme Court of Canada an accounting firm that was faced with a claim by a trust (through its trustees) for damages resulting from the bankruptcy of a holding company of which the trust was the sole shareholder. The Supreme Court upheld the decisions of the Superior Court and the Quebec Court of Appeal, and dismissed the lawsuit against our client. The Court reiterated that in Quebec civil law as in Canadian corporate law, shareholders do not have a right of action in respect of faults committed against the corporation in which they hold shares unless it is establish that they suffered a direct prejudice distinct from that suffered by the corporation, in relation to a distinct obligation (Brunette v Legault Joly Thiffault, s.e.n.c.r.l., 2018 SCC 55)

Legal counsel to Hachette (Groupe Lagardère) in a commercial arbitration whereby Hachette sought and obtained the annulment of an asset purchase agreement.

Legal counsel for Navigant Consulting LJ Inc. in two motions by Pharmaprix Inc. and the Quebec Pharmacists operating under its banner seeking to obtain by way of a safeguard order the stay of an administrative inquiry of the Régie de l’assurance maladie du Québec (RAMQ) on the basis of an alleged conflict of interests and the alleged communication of privileged information by its forensic accountants, Navigant Consulting LJ Inc.  These motions were rejected by the Honourable Brian Riordan, j.c.s., on July 7, 2014 and his decision was confirmed by the Court of Appeal of Quebec on October 22, 2014.

Legal counsel for BPO Properties in the attempt by a group of minority shareholders to postpone the annual general meeting.

Legal counsel for several officers of public issuers in the context of inquiries carried out by the AMF or the OSC.

Legal counsel for a majority shareholder of an important corporation in a litigation following a hostile takeover by another corporation.

Legal counsel for a group of minority shareholders in the context of the privatization of an important corporation.

Legal counsel for several Canadian and European corporations in class action proceedings involving various allegations such as collusion, price fixing, etc.

Legal counsel for CGI in a major commercial dispute with one of its suppliers, Aveos.

Legal counsel for a number of auditors in the context of proceedings involving their professional liability


Mtre. Biron taught Civil Evidence at the École du Barreau from 2014 to 2018.

Québec Bar
Governor of the Foundation of the Québec Bar
Canadian Bar Association
International Association of Lawyers
Association des diplômés en droit de l’Université de Montréal (ADDUM)
Mentor in the pilot project of the Canadian Institute for the Administration of Justice

President, Théâtre du Nouveau Monde Board of Directors (TNM) 
Board of Directors (executive committee) of the Fondation du Théâtre du Nouveau Monde (TNM)
National Bank Trust Inc. (Board of Directors) (2018 - 2019)
Montreal Council on Foreign Relations (CORIM)
Honorary Board of the Ballets Jazz de Montreal (BJM)
Governor of Les Amis de la Montagne
Membership Committee of the Mount Bruno Country Club (MBCC)
Member of the organizing committee of several charitable fundraising events:
-           Since 2016, for the Fondation CHU Sainte-Justine (“Cachou” and “Du fond du choeur”)
-           Since 2013, for Les Amis de la montagne (“Chapeau mont Royal”)
-           In 2011, for the Fondation du cancer du sein (“Dans le Jardin”)
-           Since 2015, for the Fondation du Théâtre du Nouveau Monde


Certificate in Corporate Governance, ASC

Bachelor in law

Administrative and Commercial Studies



Ces nouveaux vices qui nous guettent, Premières en affaires, avril-mai 2015

Risk Management Seminar – Point of view of litigation lawyer,Conference organized by the OCAQ together with AICA Services Inc., Montreal, May 10, 2012

Revue jurisprudentielle des décisions importantes en matière de litiges commerciaux,Conference of the Canadian Bar Association, Québec Division Montreal February 9, 2011

Recent Developments in Brokers’ Liability in Canada, the 2011 Annual Review of Civil Litigation, Toronto, Carswell, 2011

Professional liability and arbitration, Conference organized by par Aica Services, Las Vegas, October 2008

The Certification of Class Actions in Canada, the 2006 Annual Review of Civil Litigation, Toronto, Carswell, 2006


Recognized by Benchmark as one of the Top 50 Women in Litigation in 2020

Recognized by Benchmark as one of the Top 25 Women in Litigation in 2019

Benchmark Litigation also identifies her as a “Litigation Star” since 2017.

Recognized by Lexpert since 2015 as a leading trial lawyer in corporate commercial litigation and in professional liability.

Recognized by The Best Lawyers in Canada since 2019 as a leading trial lawyer in corporate and commercial litigation, class actions and director and officer liability practice