Canada's Top 100 Employers for 2025 include a staggering 43 Ontario-based businesses, a reminder of why the province is considered the country's economic heart. "Employers in Canada are at a remarkable juncture, facing once-in-a-generation challenges in artificial intelligence, trade and demographics," says Richard Yerema, executive editor of the Canada's Top 100 Employers project. This year's list featured 43 Ontario-based businesses ranking among the top 100 employers, accounting for close to half of this year's list. Here are all the Ontario companies featured in this year's Canada's Top 100 Employers. AstraZeneca Canada Inc.Bank of CanadaBASF Canada Inc.BDO Canada LLPBlake, Cassels & Graydon LLPBoston Consulting Group Canada ULCCIBCCo-operators Group Limited, TheCollege of Physicians and Surgeons of OntarioDiamond Schmitt Architects Inc.Digital Extremes Ltd.Equinix, Inc.