Company lists · Data refreshed September 2026

Top 25 Marketing and advertising agencies based in London, Canada

Name: Marketing and advertising agencies based in London, Canada
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 107 companies tracked

RevenueBase identified 107 marketing and advertising agencies headquartered in London, Canada as of September 2026 and tracks 666 professional contacts across them, including 166 with verified work emails. Across Canada, Toronto is the largest hub for this category (2,224 companies); London has 107.

This list covers marketing and advertising agencies 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 5, 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 5, 2026 86% judged on-target in blind review

107Companies

666Contacts tracked

166Verified emails

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The 25 largest marketing and advertising agencies based in London, Canada

Ranked by team size

Top 25 of 107 marketing and advertising agencies based in London, Canada, ranked by team size, largest first. Data refreshed Sep 5, 2026. RevenueBase Smart Search rates how each company's information relates to marketing and advertising agencies: 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	TBK	Indirect evidence	London, ON, CanadaHQ checked Sep 5, 2026	11-50	32 contacts →
	Indirect evidence “tbk is an award-winning, full-service agency headquartered in London, Ontario that leads brands to better.” Source: RevenueBase Database · checked Sep 5, 2026
2	TMD The Marketing Department	Partial evidence	London, ON, CanadaHQ checked Sep 5, 2026	11-50	26 contacts →
	Partial evidence “TMD \| The Marketing Department is a strategic marketing and communications company.” Source: RevenueBase Database · checked Sep 5, 2026
3	Redrhino INC	Indirect evidence	London, ON, CanadaHQ checked Sep 5, 2026	11-50	26 contacts →
	Indirect evidence “The Rhinos are a wildly talented team of just over 30 digital dreamers and brand believers sized just right so that we’re easy to work with and give you big agency capabilities.” Source: RevenueBase Database · checked Sep 5, 2026
4	Giant Creative	Partial evidence	London, ON, CanadaHQ checked Sep 5, 2026	11-50	23 contacts →
	Partial evidence “We are GIANT Creative… An award-winning multichannel marketing agency on a mission to deliver enormous results with meticulous strategy and scroll-stopping creative.” Source: RevenueBase Database · checked Sep 5, 2026
5	Sparks Marketing Communications	Indirect evidence	London, ON, CanadaHQ checked Sep 5, 2026	11-50	19 contacts →
	Indirect evidence “For brands that need to be experienced.” Source: RevenueBase Database · checked Sep 5, 2026
6	JWA Group	Partial evidence	London, CanadaHQ checked Sep 5, 2026	11-50	18 contacts →
	Partial evidence “We generate business results for North American corporations through sales and marketing communications solutions.” Source: RevenueBase Database · checked Sep 5, 2026
7	Adhome Creative	Strong evidence	London, ON, CanadaHQ checked Sep 5, 2026	11-50	16 contacts →
	Strong evidence “adHOME creative is a full-service advertising & digital agency with in-depth expertise in branding, digital, traditional and shopper marketing.” Source: RevenueBase Database · checked Sep 5, 2026
8	Branton	Strong evidence	London, ON, CanadaHQ checked Sep 5, 2026	11-50	15 contacts →
	Strong evidence “As a well-established advertising firm in London for over 30 years, Branton Advertising has been providing small businesses and large corporations with marketing and advertising…” Source: RevenueBase Database · checked Sep 5, 2026
9	Sagecomm	Partial evidence	London, ON, CanadaHQ checked Sep 5, 2026	11-50	14 contacts →
	Partial evidence “sagecomm is an award-winning marketing, branding, design, communications and public relations team based in London, Ontario.” Source: RevenueBase Database · checked Sep 5, 2026
10	Foundery	Partial evidence	London, ON, CanadaHQ checked Sep 5, 2026	11-50	14 contacts →
	Partial evidence “Foundery Digital Marketing Group is a London, Ontario–based digital marketing agency helping brands grow market share, leads, and long-term visibility across both search engines…” Source: RevenueBase Database · checked Sep 5, 2026
11	Keyframe Communications	Partial evidence	London, ON, CanadaHQ checked Sep 5, 2026	11-50	12 contacts →
	Partial evidence “To say Keyframe Communications is a full-service digital marketing and production team is a tremendous understatement.” Source: RevenueBase Database · checked Sep 5, 2026
12	Reux Marketing Agency	Indirect evidence	London, ON, CanadaHQ checked Sep 5, 2026	11-50	10 contacts →
	Indirect evidence “Hi there, we're reux!” Source: RevenueBase Database · checked Sep 5, 2026
13	Campus Creative	Indirect evidence	London, ON, CanadaHQ checked Sep 5, 2026	11-50	8 contacts →
	Indirect evidence “Simple.” Source: RevenueBase Database · checked Sep 5, 2026
14	Link Advertising And Associates	Partial evidence	London, ON, CanadaHQ checked Sep 5, 2026	1-10	7 contacts →
	Partial evidence “Link Advertising is a full service advertising agency in London, Ontario.” Source: RevenueBase Database · checked Sep 5, 2026
15	Roberts Marketing	Partial evidence	London, ON, CanadaHQ checked Sep 5, 2026	1-10	6 contacts →
	Partial evidence “Creating Custom Marketing Solutions Roberts Marketing bridges the gap between traditional & digital media.” Source: RevenueBase Database · checked Sep 5, 2026
16	Slyfox WEB Design & Marketing	Indirect evidence	London, ON, CanadaHQ checked Sep 5, 2026	11-50	6 contacts →
	Indirect evidence “Every action has a purpose.” Source: RevenueBase Database · checked Sep 5, 2026
17	Digital Clicks Marketing	Indirect evidence	London, ON, CanadaHQ checked Sep 5, 2026	1-10	6 contacts →
	Indirect evidence “At Digital Clicks, we have a deep understanding of the digital platforms, strategies and tactics to fuel your online goals.” Source: RevenueBase Database · checked Sep 5, 2026
18	Interweave Media Group	Partial evidence	London, ON, CanadaHQ checked Sep 5, 2026	1-10	6 contacts →
	Partial evidence “Interweave is a Southwestern Ontario-based, full-service digital marketing agency that consists of content creation and marketing specialists.” Source: RevenueBase Database · checked Sep 5, 2026
19	Ascendant Arrow INC	Partial evidence	London, ON, CanadaHQ checked Sep 5, 2026	1-10	3 contacts →
	Partial evidence “Results-driven marketing agency with outstanding track-record.” Source: RevenueBase Database · checked Sep 5, 2026
20	Plasmid144 Digital Marketing	Indirect evidence	London, ON, CanadaHQ checked Sep 5, 2026	1-10	3 contacts →
	Indirect evidence “Plasmid144 is here to create the very best websites and digital campaigns for your online businesses.” Source: RevenueBase Database · checked Sep 5, 2026
21	Publiq Media	Partial evidence	London, ON, CanadaHQ checked Sep 5, 2026	1-10	3 contacts →
	Partial evidence “Welcome to Publiq Media, the digital marketing wizards based in the heart of London, Ontario.” Source: RevenueBase Database · checked Sep 5, 2026
22	Sator Digital	Partial evidence	London, ON, CanadaHQ checked Sep 5, 2026	1-10	3 contacts →
	Partial evidence “We are a digital marketing agency that works with businesses to create effective digital solutions that lead to optimizing results.” Source: RevenueBase Database · checked Sep 5, 2026
23	Neon Supply	Partial evidence	London, ON, CanadaHQ checked Sep 5, 2026	1-10	3 contacts →
	Partial evidence “Neon Supply is a fusion marketing agency specializing in providing innovative solutions that help small and medium-sized enterprises achieve their business goals.” Source: RevenueBase Database · checked Sep 5, 2026
24	Warpaint Media INC	Indirect evidence	London, ON, CanadaHQ checked Sep 5, 2026	1-10	2 contacts →
	Indirect evidence “Warpaint Media Inc, the creative services agency, is a small but mighty bilingual establishment that offers creative consultation services such as brand development in the form of…” Source: RevenueBase Database · checked Sep 5, 2026
25	Studio EFF	Indirect evidence	London, ON, CanadaHQ checked Sep 5, 2026	1-10	2 contacts →
	Indirect evidence “Endless false promises, manipulated reports, never-ending excuses for delays, incompetence and unnecessary use of jargons by industry experts made us realize how much BS there is…” Source: RevenueBase Database · checked Sep 5, 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: marketing and advertising agencies. 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 marketing and advertising agencies.
Partial evidence: Its own public description names part of marketing and advertising agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name marketing and advertising agencies. 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 107 marketing and advertising agencies based in London, Canada

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Marketing and advertising agencies based in London, Canada at a glance

As of Sep 5, 2026

24.9%Verified-email coverage

6.2Average contacts per company

1-10Median size (employees)

Sep 5, 2026Page data refreshed

Companies by employee count

1-10

11-50

Email recency for this list is measured across the whole Canada list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 107 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 marketing and advertising agencies, 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 London, Canada whose own description of what they do matches “marketing and advertising agencies”. 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 marketing and advertising agencies), 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 marketing and advertising agencies, 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 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, 166 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 5, 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.

Marketing and advertising agencies by metro in Canada

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 marketing and advertising agencies, 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 marketing and advertising agencies are there based in London, Canada?

RevenueBase identified 107 marketing and advertising agencies 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?

TBK, headquartered in London, tops this list with the largest team on record.

Which city in Canada has the most marketing and advertising agencies?

Toronto leads Canada with 2,224 headquartered companies, followed by Montreal (779) and Vancouver (762). London has 107.

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 166 verified decision-maker contacts tracked across these 107 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 5, 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.