Guideline Sees Ad Market Growth Continuing.

As radio managers sketch out the final months of 2026, Guideline is offering a more cautious assessment of the advertising market following a move by the Interactive Advertising Bureau last month raising its 2026 growth forecast.

Guideline Chief Insights and Analytics Officer Sean Wright says major sporting events, including the Winter Olympics and World Cup, helped generate substantial advertising revenue for media companies, providing a boost to the overall market in the first half. But he believes their impact needs to be separated from the underlying spending trends that will determine how the year finishes.

Advertising spending continues to show healthy growth, although Guideline sees a more moderate pace emerging as the year progresses. Global data shows underlying ad spending increased approximately 4.5% when major sporting events are excluded. That offers another perspective on the industry’s performance alongside IAB’s more optimistic outlook. Last month, IAB raised its full-year U.S. ad spending growth forecast to 12.3%, up from 9.5% in January. Speaking on Guideline’s latest podcast, Wright says the strong first-half results are encouraging, but understanding the underlying spending trends will be important in assessing how the market finishes 2026.

“Without factoring in what are very clear headwinds, my concern is that there’s an exuberance around the health of the ad market,” Wright says. He points to Guideline data showing year-over-year advertising spending growth has slowed from approximately 15% early in 2026 to around 7% coming out of the summer, even with the World Cup contributing to spending.

Wright cautions that advertising spending can take time to reflect changes in the broader economy. Campaigns are frequently planned and booked months before they run, meaning advertising revenues may continue to look strong even as consumer spending begins to soften. That lag could become particularly important during the final quarter, when advertisers assess consumer demand and determine how aggressively to invest in reaching shoppers. Economic pressures and slower consumer spending are also becoming increasingly important factors in Guideline’s assessment of advertising demand as consumers struggle with the higher cost of things like gas and groceries.

Wright doesn’t specifically challenge IAB's projections. But his overall cautionary tone underscores the importance of distinguishing between growth across the advertising market as a whole and the spending trends affecting individual media channels. It also highlights why advertisers and media sellers will be watching fourth quarter spending patterns closely as they begin planning for 2027.

Guideline also identifies a potentially encouraging development for advertising service providers as AI reshapes campaign planning, buying and measurement. Despite predictions that AI could allow more advertisers to bring agency functions in-house as brands have access to increasingly sophisticated tools for buying and measuring advertising, Wright says the growing complexity of advertising, including navigating the expanding number of platforms, data sources and measurement options, is reinforcing the need for outside expertise. “AI is delivering that information faster — it’s not making things easier, though,” he says.

For many companies, Wright says that makes it more practical to rely on advertising specialists while their internal marketing teams concentrate on brand strategy, creative development and customer relationships. “There’s still a role for agencies to play in the age of AI,” he says.