Company lists · Data refreshed September 2026
Top 25 Big 4 business consulting firms based in Canada
RevenueBase identified 636 big 4 business consulting firms headquartered in Canada as of September 2026 and tracks 42,042 professional contacts across them, including 15,465 with verified work emails. Toronto is the largest hub.
This list covers big 4 business consulting firms headquartered in Canada, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest big 4 business consulting firms based in Canada
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 10,294 contacts → | ||||
Indirect evidence “KPMG LLP is the Canadian member firm of KPMG International.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 8,773 contacts → | ||||
Partial evidence “MNP is a leading national accounting, tax and business consulting firm in Canada.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 5,573 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 4,833 contacts → | ||||
Indirect evidence “Canada’s Top 100 Employers 2025 I 2024 I 2023 I 2022 BDO Canada LLP is a leading provider of professional services to clients across a variety of sectors and segments.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,268 contacts → | ||||
Indirect evidence “Mallette compte plus de 40 bureaux solidement implantés dans plusieurs régions du Québec et regroupe plus de 1 600 ressources œuvrant dans différents secteurs d’activité.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 402 contacts → | ||||
Indirect evidence “Crowe MacKay LLP is a vibrant team of trusted advisors in eight cities across western and northern Canada.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 399 contacts → | ||||
Indirect evidence “Welch LLP is a Chartered Public Accounting firm that has deep roots in the communities it serves.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 347 contacts → | ||||
Indirect evidence “FBL | SOCIÉTÉ DE COMPTABLES PROFESSIONNELS AGRÉÉS Ayant été désigné comme étant l’un des dix plus grands cabinets au Québec, FBL jouit d’une solide expertise depuis plus de 40 ans.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 341 contacts → | ||||
Indirect evidence “We are a team of accountants qualified from professional bodies across the globe who have considerable experience in finance and related digital transformation.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 320 contacts → | ||||
Partial evidence “Optimus SBR is Canada’s largest independent management consulting firm.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 316 contacts → | ||||
Indirect evidence “DMCL LLP is a full-service accounting firm dedicated to helping you achieve and exceed your business goals, no matter how ambitious.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 265 contacts → | ||||
Indirect evidence “As an award-winning public accounting firm, we provide exceptional professional service (by being accessible, responsive and proactive) to meet the special and on-going individual…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 258 contacts → | ||||
Indirect evidence “At Segal GCSE LLP, we embrace an ambitious firm philosophy: to provide our valued clients with an expansive service experience that enables greater opportunities for growth and…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 228 contacts → | ||||
Indirect evidence “Recognized as Canada’s mid-market leader for audit, tax and advisory solutions, our association of 24 independent member firms comprises the eighth largest public accounting group…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 218 contacts → | ||||
Indirect evidence “Kingston Ross Pasnak offers an array of comprehensive services through our highly skilled professionals.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 199 contacts → | ||||
Indirect evidence “Smythe is a BC-based accounting firm recognized for exceptional work in the areas of assurance, taxation and business advisory services for private and public companies…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 170 contacts → | ||||
Indirect evidence “Depuis maintenant plus de 60 ans, BVA a développé une panoplie de services axés sur les préoccupations des entrepreneurs, des professionnels et des dirigeants d’entreprises.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 114 contacts → | ||||
Indirect evidence “Dès la création du cabinet Amyot Gélinas il y a maintenant plus de 30 ans, notre rêve était de grandir avec notre clientèle et de développer avec elle un partenariat fondé sur le…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 109 contacts → | ||||
Indirect evidence “At Davidson & Company, we believe that relationships are built with people, not companies.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 109 contacts → | ||||
Indirect evidence “Marcil Lavallée est un partenaire engagé qui contribue activement à la réussite de ses clients en anticipant leurs besoins et en leur offrant une gamme complète de solutions…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 103 contacts → | ||||
Indirect evidence “With a deep affinity for progress and bold entrepreneurialism, Melo LLP is an integrated, multidisciplinary team committed to driving business sustainability and growth.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 92 contacts → | ||||
Indirect evidence “Dallaire Forest Kirouac (DFK) est un cabinet d’expert(e)s‑comptables offrant des services de certification, comptabilité, fiscalité, juricomptabilité, d’évaluation d’entreprise et…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 87 contacts → | ||||
Indirect evidence “Since 1947, Famme & Co.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 86 contacts → | ||||
Partial evidence “Located in the heart of Downtown Vancouver, Invictus Accounting Group LLP provides consulting, accounting and tax advisory for publicly listed and privately held companies.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 86 contacts → | ||||
Indirect evidence “Taylor Leibow LLP is the largest and most respected independent public accounting firm in the Greater Hamilton and Burlington areas.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: big 4 business consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names big 4 business consulting firms.
- Partial evidence
- Its own public description names part of big 4 business consulting firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name big 4 business consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 636 big 4 business consulting firms based in Canada
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Big 4 business consulting firms based in Canada at a glance
As of Sep 21, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for Canada, so it is reported there. Company counts and contact totals on this page are exact for Canada, over 636 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among big 4 business consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in Canada whose own description of what they do matches “big 4 business consulting firms”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names big 4 business consulting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among big 4 business consulting firms, and records with no verified work email. Companies headquartered outside Canada are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 15,465 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 21, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Big 4 business consulting firms by metro
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names big 4 business consulting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many big 4 business consulting firms are there based in Canada?
RevenueBase identified 636 big 4 business consulting firms headquartered in Canada as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Kpmg Canada, headquartered in Toronto, tops this list with the largest team on record.
Which city has the most big 4 business consulting firms?
Toronto leads with 108 headquartered companies, followed by Vancouver (50) and Montreal (38).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 15,465 verified decision-maker contacts tracked across these 636 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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