What Prime Day is
Amazon Prime Day launched in July 2015, created to celebrate Amazon's 20th anniversary and drive Prime membership subscriptions. The first event ran for 24 hours. By 2019 it had expanded to 48 hours. By 2023 it was generating over $12 billion in global sales across two days — larger than any Black Friday or Cyber Monday event in Amazon's history at that point.
The event is exclusive to Amazon Prime subscribers. Deals require Prime membership to access. This membership gate is structural: it concentrates buying behavior among Amazon's highest-value customers, and it creates a cultural moment around the event that extends well beyond Amazon's own marketing.
Since 2022, Amazon has added a second annual deal event in October — Prime Big Deal Days (formerly Prime Early Access Sale). CPG brands now plan around two major Amazon promotional peaks per year, in addition to Black Friday and Cyber Monday in November.
The commercial weight: why it dominates CPG planning
In many CPG categories on Amazon EU, Prime Day and Black Friday together drive 35–45% of full-year category turnover. That number is not an approximation to make a rhetorical point — it is the operational reality that drives how serious brands structure their entire commercial calendar.
Consider what it means in practice. If your category generates €20M of Amazon EU volume in a year, €7–9M of that may arrive in two 48-hour windows. The inventory, media, and content decisions made weeks before those windows determine the outcome. Brands that treat Prime Day as a marketing add-on to their regular commercial calendar miss the structural significance of that concentration.
This is why the Amazon EU strategy framework treats promo architecture as a systems exercise, not a calendar overlay — and why JBP negotiations that don't explicitly address Prime Day deal formats and co-funding are commercially incomplete.
How brands participate: deal formats and mechanics
Lightning Deals. Short-duration, high-discount promotions — typically 4–12 hours, visible on Amazon's Deals page with a countdown timer. Submission deadlines fall 4–6 weeks before the event. Lightning Deals require Amazon approval and are competitive — not every submitted deal is accepted.
Prime Exclusive Discounts. Percentage-off pricing available only to Prime members, visible with a badge on the product listing. More flexible than Lightning Deals (no time limit, no approval process) but less prominent placement.
Deal of the Day. A single product featured prominently on Amazon's Deals page for a full 24 hours. The highest-visibility format, reserved for products with significant volume potential.
Coupons. Clip-and-save discounts that remain active through the event period. Lower prominence than Lightning Deals but more operational flexibility — coupons can be activated and deactivated on shorter timelines.
Media planning is inseparable from deal mechanics. CPC bids for Sponsored Products spike sharply in the days around Prime Day as every brand increases budgets simultaneously. Brands that plan media separately from promotional economics — budgeting deals on the cost of the discount alone without factoring media cost inflation — consistently underfund the event or misread its profitability.
The incrementality question: new customers or pantry loading?
The most important Prime Day question most brands don't ask: who actually bought? A Lightning Deal that moves 5,000 units in four hours might be driving 80% new-to-brand customers who will reorder at full price in 60 days. Or it might be driving 80% existing customers stocking up at a discount, who then don't repurchase for six months.
Those two outcomes have completely different commercial values — and without the measurement, they look identical in the standard Vendor Central or Seller Central report. Amazon Marketing Cloud can build the new-to-brand cohort analysis that distinguishes them. Brands running that analysis know which deal formats and discount depths actually drive acquisition versus pantry loading. That knowledge changes the JBP and the promo architecture for the next event.
Prime Day in EU: country-level variation
Prime Day runs simultaneously across Amazon EU's five main marketplaces, but participation and performance vary significantly by country. Germany and the UK carry the largest Prime Day volume in EU. France, Italy, and Spain show meaningful but proportionally lower event intensity — partly a function of Prime penetration, partly category mix differences.
The operational challenge for EU brands running deals across all five countries: a deal that is profitable at German volume may not be profitable in a smaller market with the same discount depth but one-tenth the units. Country-level promotional economics need to be modeled separately, not assumed to mirror the lead market. The governance structure for this decision — who approves deal terms by country — is one of the structural questions that effective EU Amazon strategy has to answer.