This list features large marketing and communications agencies based in Ontario. Companies like Other.™ specialize in paid media and performance creative, while Mosaic North America provides integrated marketing solutions. Klick focuses on life sciences brands, and DCM improves marketing and communication workflows.
The data shows a strong concentration of these companies in Toronto, which hosts the headquarters of most firms, including LABORATORY, an agency creating innovative marketing solutions, and DAC, a digital-first agency specializing in paid media and SEO. Many of these companies, such as WSI World and MaxBounty, operate globally, indicating an international reach for Ontario-based marketing services.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
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 | |||
| 2 |
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 | |||
| 3 |
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 | |||
| 4 | 2,006 | ||||
| 5 |
Cafeteriathisiscafeteria.com
Independent creative studio in Toronto delivering bold ideas and content for progressive brands Specializing in experiences and campaigns for all screens |
1,420 | |||
| 6 |
DCMdatacm.com
Transforming businesses by improving marketing and communication workflows across North America, with a focus on simplicity and efficiency |
1,365 | |||
| 7 |
DACdacgroup.com
International digital-first agency specializing in paid media, SEO, content strategy, local presence, reputation management, and data analytics for brands. |
1,247 | |||
| 8 |
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 | |||
| 9 |
MaxBountymaxbounty.com
A top CPA network focusing on maximizing client ROI, offering seamless global online marketing experiences for affiliates and advertisers |
997 | |||
| 10 |
Kognitive Sales Solutionskognitivesalessolutions.com
A rapidly growing marketing organization in Canada focused on providing exceptional customer service, with a strong emphasis on support and teamwork |
721 | |||
| 11 |
SJCstjoseph.com
Leading Canadian communications organization offering full-production content, advertising technology, print infrastructure, and iconic media brands for clients across North America |
698 | |||
| 12 |
Dibbly | The Urban Writerstheurbanwriters.com
An all-in-one content creation platform connecting freelancers to collaborate, using AI technology for streamlined, high-quality content creation at affordable rates |
679 | |||
| 13 |
Public Outreach Fundraisingpublicoutreachgroup.com
A leading face-to-face monthly donor recruiting agency operating in Canada, the United States, and Australia, known for completing contracts on time, non-commission staff, excellent donor retention, and outstanding support |
664 | |||
| 14 |
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 | |||
| 15 |
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 | |||
| 16 |
Diamondexperiencediamond.com
An independent and creative communications agency disrupting the industry by creating unique and impactful ideas that drive business growth and transformation |
558 | |||
| 17 |
MyOwn Marketingmyownmarketing.agency
This company specializes in digital marketing services for restaurants, including a tool to enhance Google reviews and increase customer traffic |
556 | |||
| 18 | 546 | ||||
| 19 |
PATTISON Outdoorpattisonoutdoor.com
Provides comprehensive Out-of-Home advertising solutions, including digital and transit, with extensive market coverage and customer support across Canada. |
513 | |||
| 20 |
Encore Canadaencore-can.com
Global leader in event technology and production services, delivering memorable experiences and real results through strategy, creative solutions, advanced technology, and digital platforms Operating worldwide |
495 | |||
| 21 |
SuperMarketthesupermarketinc.com
A strategic content agency crafting captivating strategies and content for global brands to drive engagement and growth |
487 | |||
| 22 |
ICUCicuc.social
A social media management company providing content moderation, community management, social listening, and customer care solutions globally with 350+ multilingual specialists |
484 | |||
| 23 |
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 | |||
| 24 |
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 | |||
| 25 |
Trutruinc.com
A solutions consultancy specializing in digital strategy, marketing, design, and development We create innovative, user-centered solutions for an ever-evolving digital landscape |
424 | |||
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 |
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 | |||
| 27 |
PRAXISpraxispr.ca
A Canadian marketing communications agency specializing in creating memorable experiences and establishing genuine connections between brands and their target audience through various integrated divisions |
362 | |||
| 28 |
The Taylor Grouptaylorinc.com
Global agency specializing in brand experiences through events, environments, and digital engagement Offers strategic insight, creative solutions, and flawless execution |
354 | |||
| 29 |
XMC - the Official Sponsorship and Experiential Marketing™ Agencyxmc.ca
An independent agency specializing in bespoke Sponsorship and Experiential Marketing™ programs for world-class companies, supported by proprietary analytics and services |
332 | |||
| 30 |
The Canadian Pressthecanadianpress.com
Independent national news agency in Canada offering news in English and French, multimedia content production, partnership with industry leaders, and digital content curation services |
323 | |||
| 31 |
Travel Edgetraveledge.com
A leading luxury-focused travel agency in North America, offering Leisure, Corporate & Events travel planning with a team of over 750 experts |
310 | |||
| 32 |
The Hivethehiveinc.com
An independent, collaborative experiential agency specializing in driving commercial growth for clients through inventive and strategic touchpoint opportunities since 1994 |
293 | |||
| 33 |
Seller Interactivesellerinteractive.com
Leading digital marketing company specializing in eCommerce intelligence, sales optimization, and Amazon marketplace management, helping businesses thrive on Amazon with proven results |
265 | |||
| 34 |
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 | |||
| 35 | 229 | ||||
| 36 |
VIBRANT Marketingvibrant.marketing
A leading commercial marketing firm that accelerates and energizes clients' commercial efforts through creative ideas, savvy marketing, and sales solutions |
202 | |||
| 37 |
Shutterstock Customstudios.shutterstock.com
A division focused on revolutionizing brand content creation by connecting brands with global creative talent for engaging, authentic, and scalable visual content |
199 | |||
| 38 |
Quarry (now Marketbridge)marketbridge.com
A marketing services platform focused on understanding buyers, reframing conversations, strategic planning, creating engaging experiences, leveraging technology, and demonstrating performance to drive customer journeys |
197 | |||
| 39 | 72 | ||||
| 40 | 66 | ||||
| 41 |
Channel Zero Inc.chz.com
A Canadian media company offering independent television, film, and digital media through various channels, including over-the-air TV, specialty channels, and digital sales agency services |
57 | |||
| 42 |
Trellisgotrellis.com
eCommerce merchandising platform for Amazon and Walmart sellers, focusing on Price, Product, Placement, and Promotion to maximize Return on Merchandising Spend |
57 | |||
| 43 |
Rootree Inc.rootree.ca
A leading sustainable packaging manufacturer and co-packer offering creative solutions, branding, design, and digital marketing services, dedicated to creating a greener future |
53 | |||
| 44 |
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 | |||
| 45 |
leverage.itleverage.it
Innovative tech and marketing company partnering with global firms and startups to drive success through strategy, creativity, and technology |
41 | |||
| 46 |
Espressoespressoagency.com
The agency focuses on linking strategy and execution, cultivating and transforming brands, taking products to market, and driving business with a unique approach and energetic team |
40 | |||
| 47 |
Clue Digitalcluedigital.com
A leading data and media partner specializing in search, social, and programmatic advertising, helping marketers transform data into growth online |
35 | |||
| 48 |
Aplo Groupaplogroup.com
E-commerce growth firm specializing in scaling DTC brands with a holistic approach, combining financial modeling, marketing expertise, and complete management of key channels |
34 | |||
| 49 |
Ext. Marketingext-marketing.com
The company specializes in financial services marketing and investment commentary, offering strategic thinking and creative solutions to top firms worldwide |
24 | |||
| 50 | 16 | ||||
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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 11, 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