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David Rosner


drosner@goodmans.ca vCard
Bay Adelaide Centre - West Tower
333 Bay Street, Suite 3400
Toronto, ON M5H 2S7

Tel:   416.597.4145
Fax:   416.979.1234

David Rosner heads the Competition, Antitrust and Foreign Investment Group at Goodmans. He provides strategic advice on all aspects of Canadian competition law, particularly with respect to complex mergers (including in regulated industries and mergers involving multi-jurisdictional review). David also advises on behavioral matters under Canadian competition law and mergers subject to the Investment Canada Act.

Drawing on his experience practising with a leading international law firm outside Canada, David translates the latest international competition law developments into strategic advantages for his clients in Canada.


David’s representative work includes acting for:

Canadian Competition Clearances for Large-Scale M&A

  • Rogers Communications in its proposed C$20.5 billion acquisition of Shaw Communications
  • Onex Corporation in its C$5 billion acquisition of WestJet Airlines Ltd., notably including clearances under the Canada Transportation Act
  • Newmont Corporation in its US$10 billion merger with Goldcorp Inc., notably including clearance under the Competition Act and Investment Canada Act
  • Altria Inc. on its C$2.4 billion investment in Cronos Group Inc., notably including clearance under the Investment Canada Act
  • Essilor International S.A. in its €46-billion combination with Luxottica Group S.p.A.

Behavioral Matters

  • a Canadian client in defence of a non-public abuse of dominance investigation by the Competition Bureau
  • a non-Canadian client in defence of allegations of an agreement among competitors by the Competition Bureau
  • a non-Canadian client in respect of an internal investigation arising from global price-fixing allegations


David was the only Canadian named in Global Competition Review’s 40 under 40 in 2020, and in 2019, was honoured as one of Lexpert’s Rising Stars: Leading Lawyers Under 40. He is recognized as a leading competition lawyer by Chambers Global, Chambers Canada, The Legal 500 Canada, Best Lawyers in Canada, the Lexpert Special Edition: Canada's Leading Litigation Lawyers and The Canadian Legal Lexpert Directory. He has also been recognized as one of the most highly regarded North American partners by Who’s Who Legal: Competition – Future Leaders since 2017, which profiles the foremost practitioners in the competition community under 45. Clients describe David as “a sharp thinker with great analytical capabilities,” and praise his “straightforward practical advice.”


David is an active member of the Canadian competition law community. He has been a professor at Osgoode Hall Law School and served as chair of several committees of the Canadian Bar Association's National Competition Law Section.


Education Osgoode Hall Law School (LL.B., 2005)
University of Winnipeg (B.A., 2002)
Professional Affiliations

Law Society of Ontario
Ontario Bar Association
Canadian Bar Association
American Bar Association

Year of Call

2006 Ontario