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Company lists · Data refreshed September 2026

Top 25 Marketing and advertising agencies based in London, Canada

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. Toronto is the largest hub.

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, how directly it supports the match, 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 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 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. Evidence rates how directly each company's own description names marketing and advertising agencies: 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.
#CompanyHeadquartersEmployeesContacts
1
TBKIndirect evidence
London, ON, CanadaHQ checked Sep 5, 202611-5032

“tbk is an award-winning, full-service agency headquartered in London, Ontario that leads brands to better.”

Source: company website · checked Sep 5, 2026
2
TMD The Marketing DepartmentPartial evidence
London, ON, CanadaHQ checked Sep 5, 202611-5026

“TMD | The Marketing Department is a strategic marketing and communications company.”

Source: company website · checked Sep 5, 2026
3
Redrhino INCIndirect evidence
London, ON, CanadaHQ checked Sep 5, 202611-5026

“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: company website · checked Sep 5, 2026
4
Giant CreativePartial evidence
London, ON, CanadaHQ checked Sep 5, 202611-5023

“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: company website · checked Sep 5, 2026
5
Sparks Marketing CommunicationsIndirect evidence
London, ON, CanadaHQ checked Sep 5, 202611-5019

“For brands that need to be experienced.”

Source: company website · checked Sep 5, 2026
6
JWA GroupPartial evidence
London, CanadaHQ checked Sep 5, 202611-5018

“We generate business results for North American corporations through sales and marketing communications solutions.”

Source: company website · checked Sep 5, 2026
7
Adhome CreativeStrong evidence
London, ON, CanadaHQ checked Sep 5, 202611-5016

“adHOME creative is a full-service advertising & digital agency with in-depth expertise in branding, digital, traditional and shopper marketing.”

Source: company website · checked Sep 5, 2026
8
BrantonStrong evidence
London, ON, CanadaHQ checked Sep 5, 202611-5015

“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: company website · checked Sep 5, 2026
9
SagecommPartial evidence
London, ON, CanadaHQ checked Sep 5, 202611-5014

“sagecomm is an award-winning marketing, branding, design, communications and public relations team based in London, Ontario.”

Source: company website · checked Sep 5, 2026
10
FounderyPartial evidence
London, ON, CanadaHQ checked Sep 5, 202611-5014

“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: company website · checked Sep 5, 2026
11
Keyframe CommunicationsPartial evidence
London, ON, CanadaHQ checked Sep 5, 202611-5012

“To say Keyframe Communications is a full-service digital marketing and production team is a tremendous understatement.”

Source: company website · checked Sep 5, 2026
12
Reux Marketing AgencyIndirect evidence
London, ON, CanadaHQ checked Sep 5, 202611-5010

“Hi there, we're reux!”

Source: company website · checked Sep 5, 2026
13
Campus CreativeIndirect evidence
London, ON, CanadaHQ checked Sep 5, 202611-508

“Simple.”

Source: company website · checked Sep 5, 2026
14
Link Advertising And AssociatesPartial evidence
London, ON, CanadaHQ checked Sep 5, 20261-107

“Link Advertising is a full service advertising agency in London, Ontario.”

Source: company website · checked Sep 5, 2026
15
Roberts MarketingPartial evidence
London, ON, CanadaHQ checked Sep 5, 20261-106

“Creating Custom Marketing Solutions Roberts Marketing bridges the gap between traditional & digital media.”

Source: company website · checked Sep 5, 2026
16
Slyfox WEB Design & MarketingIndirect evidence
London, ON, CanadaHQ checked Sep 5, 202611-506

“Every action has a purpose.”

Source: company website · checked Sep 5, 2026
17
Digital Clicks MarketingIndirect evidence
London, ON, CanadaHQ checked Sep 5, 20261-106

“At Digital Clicks, we have a deep understanding of the digital platforms, strategies and tactics to fuel your online goals.”

Source: company website · checked Sep 5, 2026
18
Interweave Media GroupPartial evidence
London, ON, CanadaHQ checked Sep 5, 20261-106

“Interweave is a Southwestern Ontario-based, full-service digital marketing agency that consists of content creation and marketing specialists.”

Source: company website · checked Sep 5, 2026
19
Ascendant Arrow INCPartial evidence
London, ON, CanadaHQ checked Sep 5, 20261-103

“Results-driven marketing agency with outstanding track-record.”

Source: company website · checked Sep 5, 2026
20
Plasmid144 Digital MarketingIndirect evidence
London, ON, CanadaHQ checked Sep 5, 20261-103

“Plasmid144 is here to create the very best websites and digital campaigns for your online businesses.”

Source: company website · checked Sep 5, 2026
21
Publiq MediaPartial evidence
London, ON, CanadaHQ checked Sep 5, 20261-103

“Welcome to Publiq Media, the digital marketing wizards based in the heart of London, Ontario.”

Source: company website · checked Sep 5, 2026
22
Sator DigitalPartial evidence
London, ON, CanadaHQ checked Sep 5, 20261-103

“We are a digital marketing agency that works with businesses to create effective digital solutions that lead to optimizing results.”

Source: company website · checked Sep 5, 2026
23
Neon SupplyPartial evidence
London, ON, CanadaHQ checked Sep 5, 20261-103

“Neon Supply is a fusion marketing agency specializing in providing innovative solutions that help small and medium-sized enterprises achieve their business goals.”

Source: company website · checked Sep 5, 2026
24
Warpaint Media INCIndirect evidence
London, ON, CanadaHQ checked Sep 5, 20261-102

“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: company website · checked Sep 5, 2026
25
Studio EFFIndirect evidence
London, ON, CanadaHQ checked Sep 5, 20261-102

“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: company website · checked Sep 5, 2026

Showing 25 of 107 marketing and advertising agencies based in London, Canada

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 166 reachable decision-makers.

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

As of Sep 5, 2026
1-10Median size (employees)
TorontoLargest hub · 2224 HQs
Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
77
11-50
30

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 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 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 “marketing and advertising agencies”. 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 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 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, 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

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 has the most marketing and advertising agencies?

Toronto leads with 2224 headquartered companies, followed by Montreal (779) and Vancouver (762).

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.

Ready to reach these companies? Verified emails and direct dials for all 107 marketing and advertising agencies based in London, Canada. Start with a free account, no credit card.

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Related lists

Browse: Companies home · Marketing and advertising agencies in Canada · All Canada lists · All Marketing and advertising agencies lists · New lists

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.

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