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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 is a partner in 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), alleged cartels and alleged abuses of dominance (including those involving technology and intellectual property). David also advises on 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

  • Onex Corporation in its proposed 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.
  • Linamar Corporation in its C$1.2 billion acquisition of the MacDon Group of Companies
  • Henkel AG & Co. KGaA in its US$3.6 billion acquisition of The Sun Products Corporation

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 recognized as one of the most highly regarded North American partners by Who’s Who Legal: Competition – Future Leaders in 2017, 2018 and 2019, 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.” In 2017, David was the only Canadian lawyer nominated by Global Competition Review for its Lawyer of the Year – Under 40 award.


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