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Top Advertising Companies in Ontario

8 of 36 advertising companies ranked on evidence in the Q4 2026 edition.

Between them, the 36 advertising companies on this page cover creative (8), business services (7), consumer products & services (6) and branding (6). They also list work in Toronto and Mississauga. 36 of them have written a profile you can read before you get in touch.

TrustList ranking

Q4 2026 edition

8 of 36 advertising companies ranked on evidence held on 6 October 2026: client reviews, vetting, awards and facts each business states on its own website, which we read and date. Nobody pays to be placed.

Positions are fixed for the quarter; the next edition is due in January 2027.

How this is ranked About this edition

All advertising companies 8 ranked SMEs 8 ranked

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Also listed, not yet ranked. We hold nothing checkable on these yet that ranks them here: no client review, vetting, award, expert review, or fact stated on their own website (and on a place ranking, where they are based). They follow in order of their TrustList Score. How TrustList ranks · Get vetted, free
Fourdots Digital
Digital Marketing · Creative
Fourdots Digital is a digital marketing agency in Toronto that judges its work by measurable business growth rather than likes.
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On record: Based in Toronto, Ontario, Canada
Harbinger
Harbinger is a Canadian agency based in Toronto, Ontario, with national team coverage.
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On record: Based in Toronto, Ontario
Human Brand Experience Consultants
Medical · Manufacturing · Utilities
Branding, marketing and customer experience agency in London, Ontario serving clients across Canada and the United States
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On record: Based in London, Ontario
ICONICA
Creative · Advertising · Property
ICONICA is a branding and creative studio. Its name comes from the Latin word for image, and it describes its staff as image communicators.
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iGo Sales and Marketing, Inc.
iGo Sales and Marketing, Inc. is a website design and digital marketing agency in Mississauga, Canada.
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On record: Based in Mississauga, Ontario, Canada
Imperium Social
Advertising & Marketing · Web Design · Advertising · Also in Canada
Imperium Social is a web design agency based in Kingston. It builds websites, runs search engine optimisation and designs logos, and it works with clients in other parts of the…
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On record: Address in Ontario
IN Creative
Creative · Goals · Also in Mississauga
IN Creative is a graphic design studio based in Mississauga, Ontario.
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On record: Based in Mississauga, Ontario, Canada
Jump Branding & Design Inc.
Branding
Jump Branding & Design Inc. is a branding and design agency in Toronto, Canada.
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On record: Address in Ontario
Kognitive
Retail · Learning
Kognitive Sales Solutions is a field sales and retail marketing agency serving Canada.
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L.A. Inc. New Thinking
Branding
L.A. Inc. New Thinking is a multi-disciplinary branding and marketing agency in Toronto, Ontario. Property and real estate work forms a large share of what it does.
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On record: Based in Toronto, Ontario
Leverage Advertising Company
Leverage Advertising Company is an advertising agency in Markham, Ontario.
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On record: Based in Markham, Ontario, Canada
Light Switch Creative Inc.
Light Switch Creative Inc. is an advertising and creative agency in Ottawa, Ontario.
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On record: Based in Ottawa, Ontario, Canada

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Top Advertising Companies in Ontario

Fourdots Digital

Harbinger

Human Brand Experience Consultants

ICONICA

iGo Sales and Marketing, Inc.

Imperium Social

IN Creative

Jump Branding & Design Inc.

Kognitive

L.A. Inc. New Thinking

Leverage Advertising Company

Light Switch Creative Inc.

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