Adweek fastest growing agencies: how the list is built and how to use it to pick an agency

The Adweek Fastest Growing Agencies list is a yearly ranking published by Adweek that orders agencies by the percentage growth in their revenue. It does not rank agencies by quality, size or results for clients. That makes it a useful signal if you want to know which agencies are expanding, and a weak one if you want to know which agency will do your work well. This page explains how the list is built, what it tells a buyer, and how to turn a name on it into a proper shortlist.

How the list is built

Adweek publishes each edition at its own address, with the year in the path. For the 2024 edition, Adweek's page states that agencies submitted three years of revenue, covering 2022 to 2024, and needed at least USD 250,000 in revenue in 2022 to qualify. Agencies certified their own figures and Adweek says it performed additional auditing. The ranking is by year over year revenue growth, shown as a percentage, and absolute revenue figures are not disclosed on the list for privacy reasons.

The page lets you filter by employee size, from agencies of 1 to 10 people up to 500 or more, and shows separate lists such as Top Large and Top Medium. Later editions are linked from the same page, including 2025 and 2026. The 2026 edition, read in October 2026, does not set out its rules on the page itself, so check Adweek's page for the edition you are using before you draw conclusions from a year's rules.

What a high rank tells you

• The agency is winning business. Revenue growth over several years usually means clients are buying and staying.
• It is a smaller base for many entries. A percentage is easier to move from a small number. An agency growing 300 percent from a small base and one growing 20 percent from a large one are doing different things.
• It was eligible and entered. Agencies apply. A strong agency that did not submit is not on the list.

What it does not tell you

• Whether the agency's work suits your industry or your size of budget.
• Whether the people who sold you the work will be the people doing it.
• Client retention, results, or staff turnover.
• Whether growth came from one large client.

Treat the list the way you would treat an award: a reason to look, never a reason to sign. Our guide to what an award-winning claim is worth and how to verify one applies here.

Turning the list into a shortlist

1. Filter by agency type. Adweek's categories include creative, digital, media, experiential, full service, consultancy and social agencies. Pick the type that matches your need.
2. Filter by size. An agency of 5 people and one of 400 run different accounts. Match the agency's size to your budget so you are a meaningful client to them.
3. Filter by region. Time zone and market knowledge matter if you sell in one country.
4. Open each profile. Read the agency's own description and the clients and work it names.
5. Check the agency's own site. Does its work page show projects like yours, and does it show results with numbers you can trace to a client?
6. Pick three, not ten. Ask each for a proposal against the same brief.

Questions to ask a listed agency

• What share of your growth came from new clients and what share from existing ones?
• What is your client retention over three years?
• Who will work on my account, and how many other accounts do they hold?
• Can I speak to a client who joined when you were smaller?
• How do you charge, and what happens to my fee if my scope changes?

Rapid growth strains an agency. People are hired fast, processes are rewritten, and senior staff are pulled into new pitches. A good agency answers these questions directly. The longer list of thirty questions to ask before hiring a marketing agency covers evidence to request and how to compare proposals.

Other lists, and how they differ

Type of list	What it measures	Best used for
Fastest growing	Percentage revenue growth	Spotting momentum
Largest agencies	Revenue or headcount	Large, multi market work
Awards	Judged creative or effectiveness work	Judging the quality of one piece of work
Client reviews	Customer experience	Judging day to day service

Use two or three of these together. A name that appears on a growth list, has a client reference you spoke to, and has work you admire passes more checks than any single ranking supplies.

If you are the agency

Agencies read this list for the opposite reason: to be on it. Keep clean revenue records for three consecutive years, because the submission asks for them and Adweek audits them. Read the rules of the current edition on Adweek's page before you apply, since they are stated per edition.

Reading one profile closely

Each agency on the list has a profile with its own description. Read it in three passes.

1. The claims. Separate facts you can check, such as the year it was founded, the cities it works from and named clients, from adjectives such as innovative or award winning.
2. The growth explanation. A profile that says why it grew, for example a new service line or a large client win, tells you more than a bare percentage. One that gives no reason leaves you to ask.
3. The category tags. Adweek tags agencies by type and region. If the tags and the work shown on the agency site disagree, ask which is current.

Then open the agency site in another tab and look for one case study in your sector with a result you can trace to a named client. A list placement plus a traceable case study is a better reason to call than either alone.

Questions about the Adweek Fastest Growing Agencies list

Who decides the ranking?

The ranking is by revenue growth percentage from figures agencies submit and certify. Adweek states that it audits the submissions.

Does the list show how much revenue an agency makes?

Not on the 2024 edition, which states that revenue is not disclosed for privacy reasons. Some agency profiles quote their own figures.

Is a higher rank a better agency?

It is a faster growing agency. Better depends on your brief, so test fit with references and a paid pilot.

How often is it published?

Adweek lists separate editions by year, with 2024, 2025 and 2026 pages available at the time of writing.

Can small agencies appear?

Yes. The 2024 rules set a floor of USD 250,000 in 2022 revenue, and the size filter starts at agencies of 1 to 10 people.

What an assistant says when you ask for a fast growing agency

A buyer building a shortlist often skips the ranking page and asks ChatGPT or Perplexity for a fast growing agency in their city or niche. The assistant names a handful of firms, and a place on Adweek's list is one of the sources it can draw on, alongside the agency's own pages and press coverage. AI Knows Us asks the assistants the questions buyers ask about your category and records which agencies they name, so an agency can see whether a growth ranking carries through to the answer a prospect receives.