# Marketing and communications agencies headquartered in Ontario
Tamtam tracks 79 marketing and communications agencies headquartered in Ontario. This list ranks the 50 largest by number of employees on LinkedIn, led by Other.β’, Mosaic North America and LABORATORY. Their median headcount is 424. Half of them were founded in 2006 or later. The most common headquarters are Toronto (34), Mississauga (3) and Ottawa (3).
This list features large marketing and communications agencies based in Ontario. Companies like Other.β’ 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.
π¨π¦ Ontario Β· 50 companies Β· Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Other.β’](https://www.tamtam.ai/c/other-toronto) (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 | π¨π¦ Toronto | 9,168 | 2015 |
| 2 | [Mosaic North America](https://www.tamtam.ai/c/mosaic-north-america) (mosaic.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 | π¨π¦ Toronto | 2,946 | |
| 3 | [LABORATORY](https://www.tamtam.ai/c/laboratory) (wearelaboratory.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 | π¨π¦ Toronto | 2,731 | 2016 |
| 4 | [Klick](https://www.tamtam.ai/c/klick) (klick.com)
An independent commercialization partner for life sciences brands, focused on developing, launching, and supporting brands to maximize market potential globally | Advertising Services | π¨π¦ Toronto | 2,006 | 1997 |
| 5 | [Cafeteria](https://www.tamtam.ai/c/cafeteria) (thisiscafeteria.com)
Independent creative studio in Toronto delivering bold ideas and content for progressive brands Specializing in experiences and campaigns for all screens | Entertainment Providers | π¨π¦ Toronto | 1,420 | 2015 |
| 6 | [DCM](https://www.tamtam.ai/c/dcm-brampton) (datacm.com)
Transforming businesses by improving marketing and communication workflows across North America, with a focus on simplicity and efficiency | Marketing Services | π¨π¦ Brampton | 1,365 | 1959 |
| 7 | [DAC](https://www.tamtam.ai/c/dac) (dacgroup.com)
International digital-first agency specializing in paid media, SEO, content strategy, local presence, reputation management, and data analytics for brands. | Marketing Services | π¨π¦ Toronto | 1,247 | |
| 8 | [WSI World](https://www.tamtam.ai/c/wsi-world) (wsiworld.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 | π¨π¦ Etobicoke | 1,174 | 1995 |
| 9 | [MaxBounty](https://www.tamtam.ai/c/maxbounty) (maxbounty.com)
A top CPA network focusing on maximizing client ROI, offering seamless global online marketing experiences for affiliates and advertisers | Advertising Services | π¨π¦ Ottawa | 997 | 2004 |
| 10 | [Kognitive Sales Solutions](https://www.tamtam.ai/c/kognitive-sales-solutions) (kognitivesalessolutions.com)
A rapidly growing marketing organization in Canada focused on providing exceptional customer service, with a strong emphasis on support and teamwork | Staffing and Recruiting | π¨π¦ Toronto | 721 | 2006 |
| 11 | [SJC](https://www.tamtam.ai/c/sjc-toronto) (stjoseph.com)
Leading Canadian communications organization offering full-production content, advertising technology, print infrastructure, and iconic media brands for clients across North America | Marketing Services | π¨π¦ Toronto | 698 | 1956 |
| 12 | [Dibbly \| The Urban Writers](https://www.tamtam.ai/c/dibbly-the-urban-writers) (theurbanwriters.com)
An all-in-one content creation platform connecting freelancers to collaborate, using AI technology for streamlined, high-quality content creation at affordable rates | Writing and Editing | π¨π¦ Toronto | 679 | |
| 13 | [Public Outreach Fundraising](https://www.tamtam.ai/c/public-outreach-fundraising) (publicoutreachgroup.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 | Fundraising | π¨π¦ Toronto | 664 | 2002 |
| 14 | [LAUNCH!](https://www.tamtam.ai/c/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 | π¨π¦ Mississauga | 644 | 1993 |
| 15 | [Bond Brand Loyalty](https://www.tamtam.ai/c/bond-brand-loyalty) (bondbl.com)
This company specializes in creating lasting relationships between people and brands through intelligent connections, engaging experiences, and advanced technology solutions globally | Advertising Services | π¨π¦ Toronto | 640 | 1980 |
| 16 | [Diamond](https://www.tamtam.ai/c/diamond) (experiencediamond.com)
An independent and creative communications agency disrupting the industry by creating unique and impactful ideas that drive business growth and transformation | Advertising Services | π¨π¦ Toronto | 558 | 2006 |
| 17 | [MyOwn Marketing](https://www.tamtam.ai/c/myown-marketing) (myownmarketing.agency)
This company specializes in digital marketing services for restaurants, including a tool to enhance Google reviews and increase customer traffic | Design Services | π¨π¦ Toronto | 556 | 2022 |
| 18 | [Hiveey](https://www.tamtam.ai/c/hiveey) (hiveey.com)
A digital growth agency specializing in building brand loyalty for businesses | Other | π¨π¦ Ontario | 546 | |
| 19 | [PATTISON Outdoor](https://www.tamtam.ai/c/pattison-outdoor) (pattisonoutdoor.com)
Provides comprehensive Out-of-Home advertising solutions, including digital and transit, with extensive market coverage and customer support across Canada. | Advertising Services | π¨π¦ Mississauga | 513 | |
| 20 | [Encore Canada](https://www.tamtam.ai/c/encore-canada) (encore-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 | Events Services | π¨π¦ Brampton | 495 | |
| 21 | [SuperMarket](https://www.tamtam.ai/c/supermarket-toronto) (thesupermarketinc.com)
A strategic content agency crafting captivating strategies and content for global brands to drive engagement and growth | Advertising Services | π¨π¦ Toronto | 487 | 2012 |
| 22 | [ICUC](https://www.tamtam.ai/c/icuc) (icuc.social)
A social media management company providing content moderation, community management, social listening, and customer care solutions globally with 350+ multilingual specialists | Marketing Services | π¨π¦ Toronto | 484 | 2002 |
| 23 | [PUSH Media](https://www.tamtam.ai/c/push-media) (push.agency)
A performance marketing consultancy specializing in building measurable media and creative platforms using martech and AI technology, with a Zero-Wasteβ’ philosophy | Advertising Services | π¨π¦ Toronto | 477 | 2012 |
| 24 | [Brand Momentum](https://www.tamtam.ai/c/brand-momentum) (brandmomentum.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 | π¨π¦ Mississauga | 445 | 2009 |
| 25 | [Tru](https://www.tamtam.ai/c/tru-toronto) (truinc.com)
A solutions consultancy specializing in digital strategy, marketing, design, and development We create innovative, user-centered solutions for an ever-evolving digital landscape | IT Services and IT Consulting | π¨π¦ Toronto | 424 | 2009 |
| 26 | [SCS](https://www.tamtam.ai/c/scs) (wearescs.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 | π¨π¦ Toronto | 363 | 1985 |
| 27 | [PRAXIS](https://www.tamtam.ai/c/praxis-toronto) (praxispr.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 | Public Relations and Communications Services | π¨π¦ Toronto | 362 | 2000 |
| 28 | [The Taylor Group](https://www.tamtam.ai/c/the-taylor-group) (taylorinc.com)
Global agency specializing in brand experiences through events, environments, and digital engagement Offers strategic insight, creative solutions, and flawless execution | Events Services | π¨π¦ Orangeville | 354 | 1931 |
| 29 | [XMC - the Official Sponsorship and Experiential Marketingβ’ Agency](https://www.tamtam.ai/c/xmc-the-official-sponsorship-and-experiential-marketing-agency) (xmc.ca)
An independent agency specializing in bespoke Sponsorship and Experiential Marketingβ’ programs for world-class companies, supported by proprietary analytics and services | Marketing Services | π¨π¦ Toronto | 332 | 2006 |
| 30 | [The Canadian Press](https://www.tamtam.ai/c/the-canadian-press) (thecanadianpress.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 | Media Production | π¨π¦ Toronto | 323 | |
| 31 | [Travel Edge](https://www.tamtam.ai/c/travel-edge) (traveledge.com)
A leading luxury-focused travel agency in North America, offering Leisure, Corporate & Events travel planning with a team of over 750 experts | Travel Arrangements | π¨π¦ Toronto | 310 | |
| 32 | [The Hive](https://www.tamtam.ai/c/the-hive-toronto) (thehiveinc.com)
An independent, collaborative experiential agency specializing in driving commercial growth for clients through inventive and strategic touchpoint opportunities since 1994 | Advertising Services | π¨π¦ Toronto | 293 | |
| 33 | [Seller Interactive](https://www.tamtam.ai/c/seller-interactive) (sellerinteractive.com)
Leading digital marketing company specializing in eCommerce intelligence, sales optimization, and Amazon marketplace management, helping businesses thrive on Amazon with proven results | Technology, Information and Internet | π¨π¦ Markham | 265 | 2012 |
| 34 | [Bensimon Byrne](https://www.tamtam.ai/c/bensimon-byrne) (bensimonbyrne.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 | π¨π¦ Toronto | 232 | 1993 |
| 35 | [BIMM](https://www.tamtam.ai/c/bimm) (bimm.com)
Toronto-based agency specializing in data-driven, technology-driven, and creative campaigns, digital products, and customer experiences across various sectors Grow with us! | Marketing Services | π¨π¦ Toronto | 229 | 1980 |
| 36 | [VIBRANT Marketing](https://www.tamtam.ai/c/vibrant-marketing) (vibrant.marketing)
A leading commercial marketing firm that accelerates and energizes clients' commercial efforts through creative ideas, savvy marketing, and sales solutions | Marketing Services | π¨π¦ Toronto | 202 | 2006 |
| 37 | [Shutterstock Custom](https://www.tamtam.ai/c/shutterstock-custom) (studios.shutterstock.com)
A division focused on revolutionizing brand content creation by connecting brands with global creative talent for engaging, authentic, and scalable visual content | Technology, Information and Internet | π¨π¦ Toronto | 199 | |
| 38 | [Quarry (now Marketbridge)](https://www.tamtam.ai/c/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 | Marketing Services | π¨π¦ St. Jacobs | 197 | 1973 |
| 39 | [Cartel](https://www.tamtam.ai/c/cartel) (cartel.me)
Specializing in internet marketing, digital marketing, web marketing, and e-marketing to promote products and services online effectively | Advertising Services | π¨π¦ Cambridge | 72 | |
| 40 | [bicom](https://www.tamtam.ai/c/bicom) (bicom.ca)
A company combining big agency experience with boutique agility, specializing in media and influencer engagement, corporate services, digital content, and experiences | Public Relations and Communications Services | π¨π¦ Toronto | 66 | 2006 |
| 41 | [Channel Zero Inc.](https://www.tamtam.ai/c/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 | Broadcast Media Production and Distribution | π¨π¦ Toronto | 57 | 2000 |
| 42 | [Trellis](https://www.tamtam.ai/c/trellis-ottawa) (gotrellis.com)
eCommerce merchandising platform for Amazon and Walmart sellers, focusing on Price, Product, Placement, and Promotion to maximize Return on Merchandising Spend | Software Development | π¨π¦ Ottawa | 57 | 2019 |
| 43 | [Rootree Inc.](https://www.tamtam.ai/c/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 | Packaging and Containers Manufacturing | π¨π¦ Burlington | 53 | 2010 |
| 44 | [Measure Marketing Results Inc.](https://www.tamtam.ai/c/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 | π¨π¦ Toronto | 51 | 2008 |
| 45 | [leverage.it](https://www.tamtam.ai/c/leverage-it) (leverage.it)
Innovative tech and marketing company partnering with global firms and startups to drive success through strategy, creativity, and technology | Software Development | π¨π¦ Toronto | 41 | 2013 |
| 46 | [Espresso](https://www.tamtam.ai/c/espresso) (espressoagency.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 | Marketing & Advertising | π¨π¦ Toronto | 40 | 1996 |
| 47 | [Clue Digital](https://www.tamtam.ai/c/clue-digital) (cluedigital.com)
A leading data and media partner specializing in search, social, and programmatic advertising, helping marketers transform data into growth online | Advertising Services | π¨π¦ Toronto | 35 | 2018 |
| 48 | [Aplo Group](https://www.tamtam.ai/c/aplo-group) (aplogroup.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 | Advertising Services | π¨π¦ Ottawa | 34 | |
| 49 | [Ext. Marketing](https://www.tamtam.ai/c/ext-marketing) (ext-marketing.com)
The company specializes in financial services marketing and investment commentary, offering strategic thinking and creative solutions to top firms worldwide | Marketing Services | π¨π¦ Toronto | 24 | 2010 |
| 50 | [Targeo](https://www.tamtam.ai/c/targeo) (targeo.ca)
Canadian company specializing in omni-channel flyer solutions, boosting ROI and supporting business growth through comprehensive marketing support across Canada | Advertising Services | π¨π¦ Vaughan | 16 | |
## 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](https://www.tamtam.ai/l/largest-companies-ontario) (5,032)
- [Multinational companies in Ontario](https://www.tamtam.ai/l/multinational-companies-ontario) (901)
- [Financial services firms in Ontario](https://www.tamtam.ai/l/financial-services-firms-ontario) (396)
- [Manufacturers in Ontario](https://www.tamtam.ai/l/manufacturers-ontario) (389)
- [Critical infrastructure operators in Ontario](https://www.tamtam.ai/l/critical-infrastructure-operators-ontario) (344)
- [Retail chains in Ontario](https://www.tamtam.ai/l/retail-chains-ontario) (327)
- [Companies with in-house R&D in Ontario](https://www.tamtam.ai/l/r-and-d-companies-ontario) (300)
- [Logistics companies in Ontario](https://www.tamtam.ai/l/logistics-companies-ontario) (285)
- [Education providers in Ontario](https://www.tamtam.ai/l/education-companies-ontario) (276)
- [SaaS companies in Ontario](https://www.tamtam.ai/l/saas-companies-ontario) (275)
- [Truck Transportation companies in Ontario](https://www.tamtam.ai/l/truck-transportation-companies-ontario) (270)
- [Transportation, Logistics, Supply Chain and Storage companies in Ontario](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-ontario) (261)
- [Public sector organisations in Ontario](https://www.tamtam.ai/l/public-sector-organisations-ontario) (259)
- [Financial Services companies in Ontario](https://www.tamtam.ai/l/financial-services-companies-ontario) (250)
- [IT Services and IT Consulting companies in Ontario](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-ontario) (235)
- [Software Development companies in Ontario](https://www.tamtam.ai/l/software-development-companies-ontario) (231)
- [Healthcare providers in Ontario](https://www.tamtam.ai/l/healthcare-providers-ontario) (226)
- [Hardware manufacturers in Ontario](https://www.tamtam.ai/l/hardware-companies-ontario) (213)
- [Professional services firms in Ontario](https://www.tamtam.ai/l/professional-services-firms-ontario) (211)
- [Hospitals and Health Care companies in Ontario](https://www.tamtam.ai/l/hospitals-and-health-care-companies-ontario) (205)
- [Distributors and wholesalers in Ontario](https://www.tamtam.ai/l/distributors-and-wholesalers-ontario) (183)
- [Companies with a mobile app in Ontario](https://www.tamtam.ai/l/companies-with-mobile-app-ontario) (181)
- [Publicly traded companies in Ontario](https://www.tamtam.ai/l/publicly-traded-companies-ontario) (156)
- [IT services companies in Ontario](https://www.tamtam.ai/l/it-services-companies-ontario) (156)
## The same list elsewhere in Canada
- [Marketing and communications agencies in Canada](https://www.tamtam.ai/l/marketing-agencies-canada) (148)
- [Marketing and communications agencies in the province of Quebec](https://www.tamtam.ai/l/marketing-agencies-province-of-quebec) (32)
- [Marketing and communications agencies in Toronto](https://www.tamtam.ai/l/marketing-agencies-toronto) (52)
- [Marketing and communications agencies in Montreal](https://www.tamtam.ai/l/marketing-agencies-montreal) (25)
---
Source: https://www.tamtam.ai/l/marketing-agencies-ontario