Market comparison
US vs UK: agency markets compared
Budget is concentrating in social, video and commerce media, so agencies with genuine depth in those channels price accordingly. Media investment is growing faster than most in-house teams are, so capacity in the strongest disciplines is contested.
Market size and coverage
Advertising figures come from the named industry body or statistics agency in each market. They are published on different bases and in different currencies, so treat them as scale, not a ratio.
United States
Budgets quoted in USD where sourced.
- Internet advertising revenue
- Nearly $300bn (2025)
Up 13.9% year over year; social media up 32.6% to $117.7bn and digital video up 25.4% to $74bn.
Source: IAB / PwC Internet Advertising Revenue Report, Full Year 2025
Listed agencies: 73 across 35 cities
Scored on our methodology: 62
Main cities: New York (10), Chicago (4), Nashville (4), Portland (4), San Diego (4), San Francisco (4)
Deepest specialties: Paid Media (24), Branding (19), Content Marketing (18), Digital Marketing (17), SEO (16)
United Kingdom
Budgets quoted in GBP where sourced.
- Total advertising investment
- £46.7bn (2025)
- Quarterly trend
- £12.5bn in Q3 2025
Roughly 10% growth year over year, with UK ad spend forecast to pass £50bn for the first time in 2026.
Source: Advertising Association / WARC Expenditure Report, 30 April 2026
Up 11.4% year over year.
Listed agencies: 75 across 15 cities
Scored on our methodology: 65
Main cities: London (51), Manchester (3), Sheffield (3), Bath (2), Birmingham (2), Bristol (2)
Deepest specialties: Branding (17), Digital Marketing (14), SEO (11), Brand Strategy (10), Paid Media (10)
Rules that change the work
These differences usually matter more to a cross-border engagement than price does.
United States
- Federal Trade Commission enforcement of advertising claims and endorsement disclosure
- State attorneys general on consumer protection and subscription practices
- State privacy laws led by California's CCPA/CPRA, with a growing patchwork of state statutes
- CAN-SPAM for commercial email and the TCPA for calls and texts
United Kingdom
- Advertising Standards Authority, applying the CAP and BCAP codes
- Competition and Markets Authority on misleading claims and green claims
- UK GDPR for personal data, enforced by the Information Commissioner's Office
- PECR for email, SMS, cookies and telephone marketing consent
What we have published for each market
United States
- Top 10 Marketing and Branding Agencies in the United StatesLast researched September 9, 2026
- Hiring a Marketing or Branding Agency in the United States: A Buyer's GuideWhat the US agency market looks like in 2026, where capability clusters, how FTC endorsement rules, CAN-SPAM and state privacy laws affect campaigns, and how to build a shortlist you can defend.
United Kingdom
- Top 10 Marketing and Branding Agencies in the United KingdomLast researched September 9, 2026
- Hiring a Marketing or Branding Agency in the United Kingdom: A Buyer's GuideWhat the UK agency market looks like in 2026, where capability sits outside London, how the CAP Code, UK GDPR and PECR shape campaigns, and how to build a shortlist you can defend.
Choosing between US and UK
- Pick the market where the work is being sold, not where it is cheapest. Local media buying, language and consumer regulation are the hardest things to outsource across a border.
- For a cross-border engagement, agree the contract currency, who carries exchange-rate risk, where the work is performed and how personal data moves between the two jurisdictions before you sign.
- Ask both shortlists the same question: show one comparable project, the brief, what changed afterwards, and where those numbers came from.
- Check who actually runs the account. In both markets, the senior people in the pitch are frequently not the people delivering the work.