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Stikeman Elliott LLP

Work +1 416 869 5500
Fax +1 416 947 0866
Calgary, London, Montreal, New York, Ottawa, Sydney and 2 more

Katherine L. Kay

Work (416) 869-5507
Stikeman Elliott LLP

Work Department

Competition & Antitrust




Katherine Kay is a partner in the litigation and competition departments, and heads the competition litigation practice. Her practice concentrates on complex commercial litigation, often involving interplay between regulatory, civil and criminal law regimes, with a focus on competition, product liability, class actions, and white collar cases. Global Competition Review has described her as "arguably the best competition litigator Canada has to offer” and Benchmark Canada named her Competition Litigator of the Year (2014, 2016 and 2018). Known for highly effective advocacy before courts and tribunals across the country, Katherine is a first call for “bet the farm” litigation and investigations.


Ontario Bar (1988)
Canadian Bar Association
American Bar Association (Antitrust Law Section)
The Advocates' Society
Toronto Lawyers Association


Osgoode Hall Law School (LL.B. 1986)
Carleton University (B.A. with distinction 1983)


Competition and antitrust

Within: Leading individuals

Katherine L. Kay - Stikeman Elliott LLP

Within: Competition and antitrust

Top-tier competition shop’, Stikeman Elliott LLP is ‘head and shoulders above the rest’, according to some. Highlighted as ‘extremely strong on the litigation side’, due in no small part to ‘first-class competition litigator’ Katherine L. Kay, the group also excels in major merger reviews, complex behavioural matters and foreign investment work. High-profile department head Paul Collins is a ‘sophisticated operator’ and acted with Ottawa’s Susan M. Hutton to advise Bayer on its headline $66bn acquisition of Monsanto. In another transactional file, Collins is advising Airbus on its partnership with Bombardier and Investissement Québec for the C Series aircraft program. On the investigations front, the ‘increasingly prominent’ Eliot Kolers is representing Sobeys in the Bureau’s investigation into alleged price-fixing in the bread market. In a headline contentious case, star litigator Kay is representing CIBC in a set of class actions brought against several banks and credit card companies alleging anti-competitive conduct in the setting of interchange fees. Michael Kilby, who advised Cheung Kong Property Holdings on its C$2.8bn acquisition of Canadian Reliance Home Comfort, is also recommended. Named partners are based in Toronto unless otherwise stated.

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Dispute resolution

Within: Leading individuals: Dispute resolution: Ontario

Katherine L. Kay - Stikeman Elliott LLP

Within: Dispute resolution

Stikeman Elliott LLP’s national litigation practice maintains its dominant position in major class actions and also excels in securities litigation, product liability and arbitration — among other areas. Among the Toronto office’s recent highlights, Peter Howard represented Livent in bringing a high-profile negligence claim against its auditors. In addition, dispute resolution head Eliot Kolers successfully acted for Omega in opposing an application by the Ontario Securities Commission for a temporary order to cease trading and suspend its registration. Seasoned litigator David R. Byers and competition litigation lead Katherine L. Kay are also key names in Toronto. Yves Martineau is a sought-after name in Montreal and is defending Société Telus Communications in a class action alleging it set excessive international roaming charges. Other key contacts include Geoffrey Holub in Calgary and David Brown in Vancouver. Louis Bélanger left to join Montreal boutique Arnault Thibault Cléroux.

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