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Top 50 Advertising Services companies in Ontario

Tamtam tracks 100 Advertising Services companies headquartered in Ontario. This list ranks the 50 largest by number of employees on LinkedIn, led by SHOP, Other.™ and Mosaic North America. Their median headcount is 173. Half of them were founded in 2005 or later. The most common headquarters are Toronto (36), Mississauga (5) and Oakville (3).

🇨🇦 Ontario50 companiesUpdated Nov 12, 2026

These companies in Ontario are primarily large advertising services firms. SHOP is an innovative marketplace for trendy products, while Other.™ specializes in paid media and performance creative. Mosaic North America is an integrated marketing agency with a 30-year history, and Klick is an independent commercialization partner for life sciences brands. WSI World is a global leader in digital marketing.

The data shows a strong concentration of these larger advertising services companies in Toronto, which hosts many headquarters, including those of Other.™, Mosaic North America, Klick, and Bond Brand Loyalty. Other significant hubs include Mississauga and Milton.

#CompanyIndustryHeadquarters EmployeesFounded
1
SHOPsearchfindorder.com

Innovative marketplace offering a variety of trendy products including gadgets, electronics, home items, and automotive accessories for consumers seeking the latest trends

Advertising Services 🇨🇦 Milton 11,517 n/a
2
Other.™weareother.ca

Specialized paid media and performance creative agency helping marketers optimize media spend, achieve targets, and outperform competition with proven methodologies and successful campaigns

Advertising Services 🇨🇦 Toronto 9,168 2015
3
Mosaic North Americamosaic.com

An integrated marketing agency in North America, creating connected brand experiences using data-led insights, expertise in various areas, and a 30-year history

Advertising Services 🇨🇦 Toronto 2,946 n/a
4
LABORATORYwearelaboratory.com

A full-service agency creating innovative marketing solutions without boundaries, collaborating closely with forward-thinking brands to deliver impactful strategies and designs

Advertising Services 🇨🇦 Toronto 2,731 2016
5
Klickklick.com

An independent commercialization partner for life sciences brands, focused on developing, launching, and supporting brands to maximize market potential globally

Advertising Services 🇨🇦 Toronto 2,006 1997
6
WSI Worldwsiworld.com

Global leader in digital marketing, providing tailored solutions to unlock potential for brands across various industries with over 25 years of experience

Advertising Services 🇨🇦 Etobicoke 1,174 1995
7
MaxBountymaxbounty.com

A top CPA network focusing on maximizing client ROI, offering seamless global online marketing experiences for affiliates and advertisers

Advertising Services 🇨🇦 Ottawa 997 2004
8
LAUNCH!launchthis.com

A top Retail Activation agency in Canada, specializing in experiential, promotional, and interactive marketing campaigns that drive immediate and measurable results

Advertising Services 🇨🇦 Mississauga 644 1993
9
Bond Brand Loyaltybondbl.com

This company specializes in creating lasting relationships between people and brands through intelligent connections, engaging experiences, and advanced technology solutions globally

Advertising Services 🇨🇦 Toronto 640 1980
10
Diamondexperiencediamond.com

An independent and creative communications agency disrupting the industry by creating unique and impactful ideas that drive business growth and transformation

Advertising Services 🇨🇦 Toronto 558 2006
11
PATTISON Outdoorpattisonoutdoor.com

Provides comprehensive Out-of-Home advertising solutions, including digital and transit, with extensive market coverage and customer support across Canada.

Advertising Services 🇨🇦 Mississauga 513 n/a
12
SuperMarketthesupermarketinc.com

A strategic content agency crafting captivating strategies and content for global brands to drive engagement and growth

Advertising Services 🇨🇦 Toronto 487 2012
13
LoyaltyOneloyalty.com

A leading loyalty program in Canada with over 200 retailer brands, online retailers, and credit card partners, providing valuable shopper insights

Advertising Services 🇨🇦 Toronto 486 n/a
14
PUSH Mediapush.agency

A performance marketing consultancy specializing in building measurable media and creative platforms using martech and AI technology, with a Zero-Waste™ philosophy

Advertising Services 🇨🇦 Toronto 477 2012
15
Brand Momentumbrandmomentum.ca

Canada's largest independent Sales, Marketing, and Retail agency focused on authentic brand connections, remarkable programs, and employee well-being Recognized for excellence and growth

Advertising Services 🇨🇦 Mississauga 445 2009
16
CanadaXcanadax.net

A company that collaborates with Oracle to provide specialized services, products, and solutions related to Oracle's technology and software offerings

Advertising Services 🇨🇦 Toronto 369 n/a
17
SCSwearescs.com

This company delivers brand excitement through storytelling, amplifying moments, and creating emotional connections to enhance people's lives, driving lifelong consumer loyalty

Advertising Services 🇨🇦 Toronto 363 1985
18
Environics Analyticsenvironicsanalytics.com

A leading marketing and analytical services company specializing in proprietary data, software, and consulting to help organizations understand customers and markets

Advertising Services 🇨🇦 Toronto 294 2003
19
The Hivethehiveinc.com

An independent, collaborative experiential agency specializing in driving commercial growth for clients through inventive and strategic touchpoint opportunities since 1994

Advertising Services 🇨🇦 Toronto 293 n/a
20
illuminillumin.com

A leading advertising technology firm empowering marketers with an omnichannel journey automation platform for smarter targeting and communication with online consumers

Advertising Services 🇨🇦 Toronto 232 2009
21
Bensimon Byrnebensimonbyrne.com

A strategic and creative advertising agency focused on building brands, driving growth, and impacting culture through talent, decency, and consumer-first mindset

Advertising Services 🇨🇦 Toronto 232 1993
22
KSGknewsales.com

A team of experts specializing in Experiential Sales™ programs to drive customer acquisition, with a focus on delivering measurable results for clients

Advertising Services 🇨🇦 Toronto 180 2003
23
UM Canadaumww.ca

A strategic media agency providing innovative solutions through the power of Better Science and Better Art to drive growth for brands

Advertising Services 🇨🇦 Toronto 176 2010
24
Embrembrevents.com

This national experiential marketing agency specializes in creating memorable brand campaigns through fair practices, transparency, and a friendly corporate culture

Advertising Services 🇨🇦 Toronto 173 2013
25
The Kitchen North Americakraftheinz.com

In-house agency for Kraft Heinz focused on innovative marketing strategies, creativity, and collaboration to elevate iconic brands

Advertising Services 🇨🇦 Toronto 173 2021

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26
OMD Canadaomd.com

A global media network that combines innovation, creativity, empathy, and evidence to help clients make better decisions and achieve profitable business outcomes

Advertising Services 🇨🇦 Toronto 172 n/a
27
INNOCEAN Canadainnocean.ca

A full-service advertising agency founded in 2009, with over 130 employees in Toronto and Montreal, working with renowned brands

Advertising Services 🇨🇦 Toronto 166 2009
28
Mintthemintagency.com

A Toronto-based independent creative agency specializing in brand building to positively impact culture and the future through multidisciplinary expertise

Advertising Services 🇨🇦 Toronto 164 2005
29
JAM CRMjamcrm.com

The company specializes in CRM Marketing with a focus on empowering culture, personalized communication, and long-term partnerships based on measurable results

Advertising Services 🇨🇦 Toronto 163 2007
30
Seedseedcreative.ca

A leading total creative services provider, delivering effective advertising and marketing solutions with a track record of successful problem-solving

Advertising Services 🇨🇦 London 163 2002
31
#paidhashtagpaid.com

A technology company creating tools for the creator economy, enabling businesses to collaborate with creators and drive growth Visit website for more

Advertising Services 🇨🇦 Toronto 160 2013
32
Saatchi & Saatchi Canadasaatchi.ca

A creative team of 163 diverse individuals dedicated to delivering groundbreaking ideas for the world's top brands with an unbeatable attitude

Advertising Services 🇨🇦 Toronto 159 1970
33
Inergi LPinergi.com

Inergi creates customer-centered experiences for market success through imagination and innovation, leveraging a diverse team of designers, engineers, marketers, and communicators

Advertising Services 🇨🇦 Toronto 152 n/a
34
Kennakenna.ca

Marketing solutions provider specializing in creating unified customer experiences through fully integrated engagement ecosystem for more personalized conversations and continuous connectivity

Advertising Services 🇨🇦 Mississauga 151 n/a
35
OUTFRONT Media Canadaoutfrontmedia.ca

Utilizing technology, strategic locations, and creative assets to connect brands with consumers through outdoor advertising campaigns on a local to national scale

Advertising Services 🇨🇦 Toronto 147 1904
36
Red Lionredlioncanada.com

A Toronto advertising agency specializing in creating unique solutions to influence culture through tailored campaigns for various client partners

Advertising Services 🇨🇦 Toronto 146 2012
37
Genumarkgenumark.com

A Canadian leader in custom-branded merchandise and apparel, with a commitment to ethical sourcing, sustainability, and exceptional customer service

Advertising Services 🇨🇦 Toronto 136 1980
38
Encore Market Engagementencore.market

A leading field sales organization in Canada, specializing in consulting, technology, and execution services to optimize sales investment and drive client success

Advertising Services 🇨🇦 Oakville 124 2011
39
Walmart Connect Canadawalmartconnect.ca

This company connects brands with customers through advertising on Canada's largest omnichannel retail platform to drive shared growth

Advertising Services 🇨🇦 Mississauga 105 2016
40
Harding Displayhardingdisplay.com

A leading Canadian provider of point-of-sale and in-store marketing solutions, offering innovative designs and logistical support for retail success since 1927

Advertising Services 🇨🇦 Toronto 105 1927
41
Cartelcartel.me

Specializing in internet marketing, digital marketing, web marketing, and e-marketing to promote products and services online effectively

Advertising Services 🇨🇦 Cambridge 72 n/a
42
Infiniti Retailirdinc.ca

This company specializes in creating and executing integrated brand activations, focusing on instore marketing and digital instore strategies

Advertising Services 🇨🇦 Toronto 65 n/a
43
Promotional Sourcepromotionalsource.ca

A leading provider of promotional products in Canada, offering a curated collection with bulk purchasing, preferential deliveries, and a Satisfaction Guarantee

Advertising Services 🇨🇦 Toronto 62 1996
44
Protagon Displayprotagon.com

A company that partners with brands and retailers to create custom merchandising solutions, focusing on attracting customers and delivering results

Advertising Services 🇨🇦 Toronto 59 1995
45
Ex-Sell Canadian Instore Servicesex-sell.com

A Canadian retail support company offering HQ support, in-store service teams, merchandising, display installs, demonstrations, training, and assisted sales programs

Advertising Services 🇨🇦 Oakville 58 1983
46
Entripy Custom Clothingentripy.com

A leading Canadian company specializing in custom printed apparel and promotional products, offering a wide range of options with fast turnaround times and competitive pricing

Advertising Services 🇨🇦 Oakville 56 1999
47
Central Station Torontocentralstationto.com

A unique agency specializing in branding, innovations, physical experiences, and digital marketing to create impactful connections and move people

Advertising Services 🇨🇦 Toronto 54 2015
48
Pareto - CLOSED PERMANENTLYpareto.ca

Specializing in metrics-driven marketing solutions to drive sales, enhance brand presence, and optimize customer engagement through innovative business strategies and services

Advertising Services 🇨🇦 Toronto 53 n/a
49
Measure Marketing Results Inc.measuremarketing.com

Develops innovative digital marketing strategies focused on demand generation, lead qualification, sales support, revenue growth, and maximizing ROI for businesses.

Advertising Services 🇨🇦 Toronto 51 2008
50
ALKOalko.com

Provider of strategic materials and services including digital printing, web design, and plastic gift cards & loyalty programs for clients in evolving business environments

Advertising Services 🇨🇦 Kitchener 40 1963

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How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

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