Amazon Ad Revenue Growth Slows to 12% as Prime Day Shift Bites

By James Calloway

Amazon's advertising revenue grew 12% year over year to $19.6 billion in Q3, a sharp deceleration from 22% growth in the year-ago period and 26% in Q2 2026, according to the company's earnings statement. The stock fell after the report missed analyst expectations on several fronts, including advertising.

The company blamed the shortfall on what it called "timing anomalies" tied to Prime Day. Amazon moved the dayslong deals event from July to June for the first time in several years, shifting when the Prime Day windfall landed in its books. The scheduling of the NBA season on Prime Video added drag: Q2 and Q4 carry pro basketball programming, Q3 does not. Amazon also lapped a period last year when it overhauled its search marketing programs in a way that monetized traffic at a higher rate, executives explained.

Is AI agentic shopping hurting Amazon Ads?

Consumer-facing personal agents that hunt for deals and shop on a user's behalf — including Meta's Muse — have quickly gained popularity. Amazon blocked Muse from accessing its e-commerce marketplace last month.

Still, CEO Andy Jassy dismissed the threat on the earnings call with investors. "A natural question is whether agentic shopping from external horizontal agents is meaningfully impacting Amazon Ads, and the answer is no," Jassy said. "Few customers are doing much shopping this way yet, as the experience is still not great nor more convenient than coming to a retailer directly to research or one-click order there."

For now, the numbers back him: the Q3 slowdown traces to calendar mechanics, not lost demand.

What is Amazon doing in agentic itself?

Amazon is building its own position in the space. Its Ads Agent helps marketers build, optimize and run campaigns based on parameters like budget and duration. In September, Ads Agent added full-funnel capabilities, unifying sponsored ads, display, video and streaming TV into a single effort.

How does this fit the wider ad market?

Amazon's Q3 echoes results at other digital ad platforms. Google also posted a slowdown for its core search and YouTube services amid a transition to AI products that monetize more slowly. Across the tech sector, pressure is mounting to justify heavy AI spending. Amazon's capital expenditures hit $75.9 billion in Q3, while negative free cash flow reached $42.4 billion.

What happens in Q4?

Amazon forecasts ad revenue growth in the high teens for Q4 — the critical holiday period. That marks another slowdown from the same quarter last year, when ads grew 22%. If the high-teens forecast holds, Amazon's ad business will have decelerated for three straight quarters, making the holiday readout the clearest test yet of whether calendar quirks or market forces are driving the trend.