Company lists · Data refreshed September 2026

Top 24 Big 4 business consulting firms based in Ottawa, Canada

Name: Big 4 business consulting firms based in Ottawa, Canada
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 37 companies tracked

RevenueBase identified 37 big 4 business consulting firms headquartered in Ottawa, Canada as of September 2026 and tracks 833 professional contacts across them, including 481 with verified work emails. Toronto is the largest hub.

This list covers big 4 business consulting firms headquartered in Ottawa, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

37Companies

833Contacts tracked

481Verified emails

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The 24 largest big 4 business consulting firms based in Ottawa, Canada

Ranked by team size

Top 24 of 37 big 4 business consulting firms based in Ottawa, Canada, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to big 4 business consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Welch LLP	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	201-500	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, 2026
2	Marcil Lavallée	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	51-200	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, 2026
3	Logan Katz LLP	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	51-200	80 contacts →
	Indirect evidence “Logan Katz is a forward-thinking public accounting firm delivering high-quality, client inspired accounting, taxation, assurance and business advisory services in Ottawa and…” Source: RevenueBase Database · checked Sep 21, 2026
4	Baker Tilly Ottawa LLP	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	51-200	80 contacts →
	Indirect evidence “At Baker Tilly Ottawa LLP, we provide expert tax, assurance, and entrepreneurial services to help your business grow and prosper.” Source: RevenueBase Database · checked Sep 21, 2026
5	49 Solutions	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	19 contacts →
	Partial evidence “At 49 Solutions we consistently deliver top quality consulting services, supporting both business and technology.” Source: RevenueBase Database · checked Sep 21, 2026
6	Valcom Consulting Group INC	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	18 contacts →
	Partial evidence “Valcom (Ottawa) is steadfast in its commitment to furnishing exemplary Consulting, Project Management, and Professional services tailored to facilitate the objectives of…” Source: RevenueBase Database · checked Sep 21, 2026
7	P1 Consulting	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	16 contacts →
	Partial evidence “Established in P1 Consulting has become one of Canada’s most dynamic and progressive consulting firms with a strong reputation for excellence.” Source: RevenueBase Database · checked Sep 21, 2026
8	Nīewe Consulting LTD	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	15 contacts →
	Partial evidence “Founded in 2004, Nīewe Consulting (formerly Baiame Consulting) is a majority women-owned and led professional services firm that does consulting differently.” Source: RevenueBase Database · checked Sep 21, 2026
9	Hendry Warren LLP	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	51-200	12 contacts →
	Indirect evidence “At Hendry Warren LLP our mission is to provide relevant, reliable information and advice to help our clients achieve their business goals, and offer superior client service in a…” Source: RevenueBase Database · checked Sep 21, 2026
10	The Halifax Group	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	10 contacts →
	Partial evidence “The Halifax Group is a multi-service consulting company.” Source: RevenueBase Database · checked Sep 21, 2026
11	Armstrong Jones LLP	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	1-10	8 contacts →
	Indirect evidence “Armstrong Jones LLP is an accounting firm based in Ottawa, Ontario that offers services in accounting, audit and assurance, tax planning and compliance, and a wide array of…” Source: RevenueBase Database · checked Sep 21, 2026
12	Orbis Risk Consulting	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	1-10	8 contacts →
	Partial evidence “Orbis Risk Consulting is an Ottawa based company that provides a range of services that are specifically designed to meet the internal audit and risk management needs of…” Source: RevenueBase Database · checked Sep 21, 2026
13	Navpoint Consulting Group INC	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	1-10	5 contacts →
	Partial evidence “NavPoint Consulting is an IT and Management Consulting firm advising clients in the Ottawa, Montreal and Toronto areas.” Source: RevenueBase Database · checked Sep 21, 2026
14	Confluence Consulting	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	4 contacts →
	Partial evidence “Confluence Consulting is a government focused management consulting firm specializing in the design of business and technology solutions for public sector organizations.” Source: RevenueBase Database · checked Sep 21, 2026
15	4plan Consulting	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	3 contacts →
	Partial evidence “4Plan Consulting is a Management Consulting company with the commitment and conviction to provide affordable, accessible, and responsive management consulting, professional…” Source: RevenueBase Database · checked Sep 21, 2026
16	Cyrus Echo	Partial evidence	Ottawa, CanadaHQ checked Sep 21, 2026	1-10	2 contacts →
	Partial evidence “is a management consulting firm that has served the public sector exclusively since 1996.” Source: RevenueBase Database · checked Sep 21, 2026
17	Frankware Consulting	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	1-10	2 contacts →
	Partial evidence “Frankware Consulting is a leading management consulting and professional services firm providing a broad range of both strategic advisory and technical consulting services in the…” Source: RevenueBase Database · checked Sep 21, 2026
18	Cofomo	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	1 contacts →
	Partial evidence “Established in 2003, Lumina IT has endeavored to be industry leaders in providing valued Professional Consulting Services.” Source: RevenueBase Database · checked Sep 21, 2026
19	CIO Results INC	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	1-10	1 contacts →
	Indirect evidence “Proven Experience / Trusted Advice / Real Results We bring decades of expertise to tackle what matters to you and your business.” Source: RevenueBase Database · checked Sep 21, 2026
20	Contextual Focus Limited	Partial evidence	Ottawa, CanadaHQ checked Sep 21, 2026	1-10	1 contacts →
	Partial evidence “Contextual Focus Limited was founded in 2013 to deliver management consulting services to public and private sector clients.” Source: RevenueBase Database · checked Sep 21, 2026
21	Mobile Resources	Partial evidence	Ottawa, CanadaHQ checked Sep 21, 2026	1-10	1 contacts →
	Partial evidence “Mobile Resources is a wholly Canadian-owned management consulting firm that strives to provide public and private sector clients with comprehensive professional management…” Source: RevenueBase Database · checked Sep 21, 2026
22	Riddick Investments And Consulting	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	1-10	1 contacts →
	Partial evidence “RIDDICK Investments and Consulting is an Ottawa-based consulting firm that has been delivering solutions to clients since 2019.” Source: RevenueBase Database · checked Sep 21, 2026
23	Applestone Manor INC	Indirect evidence	Ottawa, CanadaHQ checked Sep 21, 2026	1-10	1 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
24	TIA Risk And Audit Management INC	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	1-10	1 contacts →
	Indirect evidence “TIA-RAM has been a trusted partner to corporate clients for over 10 years, helping them exceed their efficiency targets in the fields of security, auditing, business continuity…” Source: RevenueBase Database · checked Sep 21, 2026

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 24 of 37 big 4 business consulting firms based in Ottawa, Canada

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Big 4 business consulting firms based in Ottawa, Canada at a glance

As of Sep 21, 2026

57.7%Verified-email coverage

22.5Average contacts per company

1-10Median size (employees)

291.9%Largest-city concentration · Toronto

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole Canada list rather than for Ottawa, so it is reported there. Company counts and contact totals on this page are exact for Ottawa, over 37 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 Ottawa, 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 Ottawa 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, 481 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 in Canada

Big 4 business consulting firms in Toronto108
Big 4 business consulting firms in Vancouver50
Big 4 business consulting firms in Montreal38
Big 4 business consulting firms in Ottawa37
Big 4 business consulting firms in Calgary34

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 Ottawa, Canada?

RevenueBase identified 37 big 4 business consulting firms headquartered in Ottawa, 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?

Welch LLP, headquartered in Ottawa, 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 481 verified decision-maker contacts tracked across these 37 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.