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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 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 |
11,517 | |||
| 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 |
9,168 | |||
| 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 |
2,946 | |||
| 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 |
2,731 | |||
| 5 | 2,006 | ||||
| 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 |
1,174 | |||
| 7 |
MaxBountymaxbounty.com
A top CPA network focusing on maximizing client ROI, offering seamless global online marketing experiences for affiliates and advertisers |
997 | |||
| 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 |
644 | |||
| 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 |
640 | |||
| 10 |
Diamondexperiencediamond.com
An independent and creative communications agency disrupting the industry by creating unique and impactful ideas that drive business growth and transformation |
558 | |||
| 11 |
PATTISON Outdoorpattisonoutdoor.com
Provides comprehensive Out-of-Home advertising solutions, including digital and transit, with extensive market coverage and customer support across Canada. |
513 | |||
| 12 |
SuperMarketthesupermarketinc.com
A strategic content agency crafting captivating strategies and content for global brands to drive engagement and growth |
487 | |||
| 13 |
LoyaltyOneloyalty.com
A leading loyalty program in Canada with over 200 retailer brands, online retailers, and credit card partners, providing valuable shopper insights |
486 | |||
| 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 |
477 | |||
| 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 |
445 | |||
| 16 |
CanadaXcanadax.net
A company that collaborates with Oracle to provide specialized services, products, and solutions related to Oracle's technology and software offerings |
369 | |||
| 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 |
363 | |||
| 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 |
294 | |||
| 19 |
The Hivethehiveinc.com
An independent, collaborative experiential agency specializing in driving commercial growth for clients through inventive and strategic touchpoint opportunities since 1994 |
293 | |||
| 20 |
illuminillumin.com
A leading advertising technology firm empowering marketers with an omnichannel journey automation platform for smarter targeting and communication with online consumers |
232 | |||
| 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 |
232 | |||
| 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 |
180 | |||
| 23 | 176 | ||||
| 24 |
Embrembrevents.com
This national experiential marketing agency specializes in creating memorable brand campaigns through fair practices, transparency, and a friendly corporate culture |
173 | |||
| 25 |
The Kitchen North Americakraftheinz.com
In-house agency for Kraft Heinz focused on innovative marketing strategies, creativity, and collaboration to elevate iconic brands |
173 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 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 |
172 | |||
| 27 |
INNOCEAN Canadainnocean.ca
A full-service advertising agency founded in 2009, with over 130 employees in Toronto and Montreal, working with renowned brands |
166 | |||
| 28 |
Mintthemintagency.com
A Toronto-based independent creative agency specializing in brand building to positively impact culture and the future through multidisciplinary expertise |
164 | |||
| 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 |
163 | |||
| 30 |
Seedseedcreative.ca
A leading total creative services provider, delivering effective advertising and marketing solutions with a track record of successful problem-solving |
163 | |||
| 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 |
160 | |||
| 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 |
159 | |||
| 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 |
152 | |||
| 34 | 151 | ||||
| 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 |
147 | |||
| 36 |
Red Lionredlioncanada.com
A Toronto advertising agency specializing in creating unique solutions to influence culture through tailored campaigns for various client partners |
146 | |||
| 37 |
Genumarkgenumark.com
A Canadian leader in custom-branded merchandise and apparel, with a commitment to ethical sourcing, sustainability, and exceptional customer service |
136 | |||
| 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 |
124 | |||
| 39 |
Walmart Connect Canadawalmartconnect.ca
This company connects brands with customers through advertising on Canada's largest omnichannel retail platform to drive shared growth |
105 | |||
| 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 |
105 | |||
| 41 | 72 | ||||
| 42 |
Infiniti Retailirdinc.ca
This company specializes in creating and executing integrated brand activations, focusing on instore marketing and digital instore strategies |
65 | |||
| 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 |
62 | |||
| 44 |
Protagon Displayprotagon.com
A company that partners with brands and retailers to create custom merchandising solutions, focusing on attracting customers and delivering results |
59 | |||
| 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 |
58 | |||
| 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 |
56 | |||
| 47 |
Central Station Torontocentralstationto.com
A unique agency specializing in branding, innovations, physical experiences, and digital marketing to create impactful connections and move people |
54 | |||
| 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 |
53 | |||
| 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. |
51 | |||
| 50 | 40 | ||||
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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.
More company lists in Ontario
- The largest companies in Ontario 5,032
- Multinational companies in Ontario 901
- Financial services firms in Ontario 396
- Manufacturers in Ontario 389
- Critical infrastructure operators in Ontario 344
- Retail chains in Ontario 327
- Companies with in-house R&D in Ontario 300
- Logistics companies in Ontario 285
- Education providers in Ontario 276
- SaaS companies in Ontario 275
- Truck Transportation companies in Ontario 270
- Transportation, Logistics, Supply Chain and Storage companies in Ontario 261
- Public sector organisations in Ontario 259
- Financial Services companies in Ontario 250
- IT Services and IT Consulting companies in Ontario 235
- Software Development companies in Ontario 231
- Healthcare providers in Ontario 226
- Hardware manufacturers in Ontario 213
- Professional services firms in Ontario 211
- Hospitals and Health Care companies in Ontario 205
- Distributors and wholesalers in Ontario 183
- Companies with a mobile app in Ontario 181
- Publicly traded companies in Ontario 156
- IT services companies in Ontario 156
The same list elsewhere in Canada
- Advertising Services companies in Canada 182
- Advertising Services companies in the province of Quebec 34
- Advertising Services companies in British Columbia 28
- Advertising Services companies in Toronto 66
- Advertising Services companies in Montreal 26