While Prime Day 2025 delivered sales spikes of up to +680%, our analysis shows that sales and units dropped 20% below pre-event levels just days later. The branding effects? Gone after Day 1.

Prime Day’s Branding Effect Lasts One Day – New Data Challenges Long-Term Value

This isn’t just another Prime Day recap—it’s a follow-up study based on anonymized data from hundreds of thousands of ASINs across Amazon’s 1P vendor business in the US, UK, and Germany. It’s packed with exclusive insights on:

• Ad-driven sales surging to 43% – and falling just as fast
• Branding spillover effects that vanish overnight
• Timing strategies that separate winners from losers
• Why most brands lose momentum post-event