Company lists · Data refreshed September 2026

Top 13 IT consulting firms based in London, Canada

Name: IT consulting firms based in London, Canada
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 42 companies tracked

RevenueBase identified 42 IT consulting firms headquartered in London, Canada as of September 2026 and tracks 591 professional contacts across them, including 208 with verified work emails. Toronto is the largest hub.

This list covers IT consulting firms headquartered in London, 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, how directly it supports the match, and when it was last checked. Data refreshed September 4, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 4, 2026 86% judged on-target in blind review

42Companies

591Contacts tracked

208Verified emails

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The 13 largest IT consulting firms based in London, Canada

Ranked by team size

Top 13 of 42 IT consulting firms based in London, Canada, ranked by team size, largest first. Data refreshed Sep 4, 2026. Evidence rates how directly each company's own description names IT consulting firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Nerds On SiteIndirect evidence	London, ON, CanadaHQ checked Sep 4, 2026	201-500	136
	“Day by day Nerds On Site is working to make itself a more enjoyable and effective partner of choice for traditional and emerging technology for You!” Source: company website · checked Sep 4, 2026
2	Consys Group INCPartial evidence	London, ON, CanadaHQ checked Sep 4, 2026	11-50	25
	“As your trusted IT service provider, Consys Group will assess your needs, help you choose the best hardware and software to provide a hassle-free IT experience.” Source: company website · checked Sep 4, 2026
3	Resonant Business Solutions INCIndirect evidence	London, ON, CanadaHQ checked Sep 4, 2026	11-50	14
	“Resonant Solutions (est.” Source: company website · checked Sep 4, 2026
4	Attache Group INCPartial evidence	London, ON, CanadaHQ checked Sep 4, 2026	11-50	13
	“For more than two decades, Attache Group has designed, implemented and supported our client’s IT infrastructure across Southwestern Ontario.” Source: company website · checked Sep 4, 2026
5	Superport-ItPartial evidence	London, CanadaHQ checked Sep 4, 2026	51-200	10
	“We are a premier IT consultancy firm with over 10 years of experience in the industry.” Source: company website · checked Sep 4, 2026
6	Carbon EdgeIndirect evidence	London, ON, CanadaHQ checked Sep 4, 2026	11-50	7
	“At Carbon Edge, we specialize in helping businesses navigate the complexities of modern technology and digital transformation.” Source: company website · checked Sep 4, 2026
7	Clarendon Technologies INCIndirect evidence	London, ON, CanadaHQ checked Sep 4, 2026	1-10	5
	Source: company website · checked Sep 4, 2026
8	TLT Networks INCIndirect evidence	London, ON, CanadaHQ checked Sep 4, 2026	1-10	4
	“TLT Networks Inc is an information technology services company serving clients in South Western Ontario.” Source: company website · checked Sep 4, 2026
9	Vertical Software International - VSI INCIndirect evidence	London, ON, CanadaHQ checked Sep 4, 2026	11-50	4
	“We create elegant, powerful and easy-to-use software for clients worldwide.” Source: company website · checked Sep 4, 2026
10	Connected Gateway INCPartial evidence	London, ON, CanadaHQ checked Sep 4, 2026	1-10	4
	“Connected Gateway Inc, is a business systems consulting firm with the sole objective “ to help customers to realize a good ROI “.” Source: company website · checked Sep 4, 2026
11	Virtual Sector Technologies LTDIndirect evidence	London, ON, CanadaHQ checked Sep 4, 2026	1-10	3
	“Virtual Sector Technologies (VST) is a Canadian technology company which was established in 2013 to provide business solutions to our customers across the globe.” Source: company website · checked Sep 4, 2026
12	Novusintelli INCIndirect evidence	London, ON, CanadaHQ checked Sep 4, 2026	1-10	2
	“E-commerce enablement Custom solutions for online presence for businesses that are enabled for key features like online booking, inventory management and payments.” Source: company website · checked Sep 4, 2026
13	Ticknor Consulting ServicesIndirect evidence	London, ON, CanadaHQ checked Sep 4, 2026	1-10	1
	“Information Technology Solutions” Source: company website · checked Sep 4, 2026

Showing 13 of 42 IT consulting firms based in London, Canada

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IT consulting firms based in London, Canada at a glance

As of Sep 4, 2026

1-10Median size (employees)

TorontoLargest hub · 906 HQs

Contacts with mobile numbers

Sep 4, 2026Data 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 this city, so it is reported there. Company counts and contact totals on this page are exact for London, over 42 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 IT consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in London, Canada whose own description of what they do matches “IT consulting firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among IT consulting firms, and records with no verified work email. Companies headquartered outside London 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 an evidence 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, 208 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 4, 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.

IT consulting firms by metro in Canada

Frequently asked

How many IT consulting firms are there based in London, Canada?

RevenueBase identified 42 IT consulting firms headquartered in London, 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?

Nerds On Site, headquartered in London, tops this list with the largest team on record.

Which city has the most IT consulting firms?

Toronto leads with 906 headquartered companies, followed by Montreal (390) and Calgary (290).

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 208 verified decision-maker contacts tracked across these 42 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 4, 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 SmartSearch, 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.