According to Forrester’s (Nasdaq: FORR) The State Of AI Inside US Marketing Agencies, 2026, a new report released today in partnership with 4As, AI is now pervasive across US marketing agencies: Nine in 10 agencies use generative AI, and half use agentic AI for marketing execution. Yet rapid adoption, combined with an industrywide focus on productivity and cost efficiency, is undermining marketing effectiveness, creativity, and long-term brand growth.
The report further states that enhancing the productivity and impact of staff remains the primary objective for agencies to use genAI (81%) and AI agents (63%). For the second consecutive year, the most cited use cases of AI in marketing include building creative content, crafting media and SEO strategy, and improving internal productivity. While CMOs and marketing teams can benefit from productivity boosts and cost efficiency in the short term, the emphasis on efficiency stifles creativity and growth in the long term.
To realize AI’s full potential, CMOs and agency leaders must reinvest efficiency gains into talent, training, and AI-powered marketing operating systems that enable differentiated experiences, stronger performance, and sustainable revenue growth.
“AI has fundamentally transformed marketing agencies, but the industry is at risk of mistaking efficiency for effectiveness,” said Jay Pattisall, VP and principal analyst at Forrester. “Our research shows that while agencies have successfully embedded AI into workflows and boosted productivity, they must now reset expectations and invest in creativity, talent, and marketing performance. Leaders who reinvest AI-driven efficiencies into innovation and differentiated experiences will be best positioned to drive sustainable growth and deliver meaningful business outcomes.”
Key takeaways from US marketing agencies’ AI adoption, usage, benefits, barriers, and commercial models include:
- AI is deeply embedded across creative, strategy, and media workflows. Agencies are using AI extensively for ideation, content creation, competitive analysis, and performance reporting. For example, 74% use genAI to summarize documents and communications, and 70% apply it to research and competitive intelligence, demonstrating its central role in day-to-day operations.
- Reliability, legal, and privacy concerns remain major barriers to scale. Challenges such as accuracy and bias (63%), legal concerns (62%), and privacy and security risks (55%) continue to slow deeper integration. For AI agents specifically, lack of expertise (54%) and data infrastructure gaps (51%) further complicate adoption.
- Monetization lags, with most agencies treating AI as a cost center. Sixty-one percent of agencies still classify AI as a “cost of business,” with limited direct monetization, but agentic AI shows promise, with 31% of agencies planning to monetize it within the next 24 months, indicating a potential shift toward revenue-generating AI services.
“The conversation around AI is evolving from adoption to impact. Agencies have embraced the technology; now the focus needs to be on how we use it to drive better marketing, stronger client outcomes, and new forms of value,” said Mollie Rosen, president of member solutions at 4As. “The real opportunity isn’t simply doing the same work faster — it’s using AI to unlock capabilities, experiences, and growth that weren’t possible before.”
Resources:
- Explore additional insights from the report.
- Forrester clients can download the report here.
- Register to attend CX Forum West in San Francisco.
- Email press@forrester.com to meet with Forrester analysts at Cannes Lions 2026.
About Forrester
Forrester (Nasdaq: FORR) is one of the most influential research and advisory firms in the world. We empower leaders in technology, customer experience, digital, marketing, revenue, and product functions to make confident decisions in an AI-driven world and accelerate growth through customer obsession. Our unique research and continuous guidance model helps executives and their teams achieve their initiatives and outcomes faster and with confidence. To learn more, visit Forrester.com.
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