Including their brandname chains:

  • Atlantic Cash & Carry
  • Atlantic Superstore
  • Axep
  • Bloor Street Market
  • Dominion
  • Les Entrepôts Presto
  • Extra Foods
  • Fortinos
  • Freshmart
  • L’Intermarché
  • Loblaws / Loblaw GreatFood / Loblaws CityMarket
  • Lucky Dollar Foods
  • Maxi / Maxi & Cie
  • NG Cash & Carry
  • No Frills
  • Provigo
  • Real Canadian Superstore
  • Shop Easy Foods
  • Shoppers Drug Mart / Pharmaprix
  • SuperValu
  • T & T Supermarket
  • Valu-mart
  • Wholesale Club / Club Entrepôt
  • Your Independent Grocer / Independent CityMarket
  • Zehrs Markets

Yes there are other big oligopoly chains like metro, Sobeys/Safeway, Pattison, but I think it’s best to start with one major chain to see how much coordinated action can affect them.