TripleLift data shows Prime Day 2026 demand shifted into planned offsite ad campaigns

TripleLift, a company that helps brands buy and optimize ads tied to e-commerce on and off Amazon, reported record-breaking results for Prime Day 2026, based on newly released proprietary data. The analysis focuses on advertiser activity over a 25-day window spanning the lead-in and the event period, and it frames Prime Day as something closer to a planned advertising moment than a last-minute promotional burst.

According to TripleLift, 45.2% growth occurred globally year-over-year for spend flowing through Amazon’s ad technology used to purchase display and video inventory (Amazon Demand-Side Platform, commonly referred to as Amazon DSP, with the acronym ADSP). TripleLift said the growth reflected advertisers committing in advance rather than simply reacting once discounts were live.

One of the clearest indicates in the dataset is timing. TripleLift said advertisers started about two weeks early, with spend during the 14-day lead-in running 19.6% above the baseline daily average. It then described a ramp-up that did not stay flat, with final days already 31% to 38% above baseline before Prime Day officially launched. When Prime Day arrived, TripleLift reported spend jumped 79.9% overnight into Day 1.

TripleLift also provided a pattern of how spending was distributed across the event window. It said spend built steadily toward a peak on Day 3, then eased in a controlled decline into close, arguing this “shape” looks like a planned campaign rather than a reactive surge. In addition, it said four days accounted for nearly one-third of total ad spend across the full 25-day window.

The company’s release also highlighted how category mix broadened. TripleLift said 61% of spend came from categories outside the shopping vertical, suggesting brands in non-shopping categories were more actively using Prime Day to reach customers through offsite commerce media, not just running retail-focused promotions.

TripleLift characterized its findings as an “inflection point” for offsite commerce media, a term broadly used for ad inventory outside retail storefronts that is still linked to commerce indicates. In this framing, the data is less about any single number and more about the maturation of how brands plan and buy Amazon-linked advertising around major retail tentpoles.

Still, the release does not disclose some details that readers may want for interpretation, including the absolute dollar volume of spend, how many advertisers were included, and whether the dataset covers all Amazon DSP activity or only a specific subset of inventory. TripleLift also did not break out results by region, advertiser size, or device, focusing instead on timing, growth, and category mix.

Looking ahead, the next question for Amazon’s advertising ecosystem is whether the Prime Day planning behavior TripleLift described generalizes to other seasonal events and whether offsite commerce media keeps pulling in more non-traditional categories. For brands, the practical watch item is whether early ramp patterns and inventory trust continue to show up across future major retail cycles, rather than spiking only during the event week.