After Prime Day and Prime Big Deal Days: how to keep the halo

Part 1

The halo: what a big event leaves behind

• What it is. The sales an event leaves behind: a higher sales rank, new customers, and reviews still to come.
• Why it happens. Amazon search ranks an item by how likely it is to sell, and a week of strong sales is the strongest signal it gets.
• What it's worth. Prime Day brought 2.1x the usual new-to-brand customers per day, and that cohort spent 1.9x a normal one over the next year.¹
• How long it lasts. No public study measures it. One Teikametrics product held 46.85% above its pre-deal rate for 22 days after a deal.² Plan for 30 days and measure your own.

Part 2 · Lever 1

Operations: re-plan stock at the new rate

• The halo shrinks your cover. 1,500 units lasts 50 days at 30 a day, and 33 days at a halo rate of 45. From October 8, that's a stockout on November 10, before T12 starts.
• A stockout costs rank. Organic placement takes 6 to 7 days to recover after a stockout of 2 days or more.³
• Delivery past 2 days means thin stock. A deal sends its heaviest traffic to the offer least able to serve it.
• Stopping is cheap before the start. A deal cancelled before it starts costs nothing. Once it's live you pay the full fee ($100 plus 1.5% of deal sales, capped at $5,000), so the fee is spent either way.^4,5

Part 3 · Lever 2

Pricing and deals: protect your T12 deal and its badge

The event that matters most is the next one. After Prime Big Deal Days that's T12, the 12 days from Black Friday Week through Cyber Monday. Amazon hasn't published 2026 dates, and 2025 ran November 20 to December 1,⁶ so expect about November 19 to 30. Whatever you do to price in October decides whether your T12 deal qualifies, and whether it gets the deal badge.

The deal tenets

These are Seller Central rules for 3P sellers. Vendors (1P) fund deals through Vendor Central, and Amazon sets the price.

• Beat your own 30-day low. A deal must be at or below the lowest price of the past 30 days, counting coupons and price discounts, and match or beat other reputable retailers.⁷ For a deal starting November 19, the window opens October 20.
• The event deal itself is excluded. Amazon says Prime Big Deal Days promotional prices "won't affect the maximum deal price" for Black Friday Week and Cyber Monday.⁵ A sale you keep running after it ends isn't covered.
• Clear the minimum discount off the reference price. For Black Friday and Cyber Monday 2025, that was 15% for Best Deals, 20% for Lightning Deals and 15% for Prime Exclusive Discounts, which carry the event badge.⁸ Amazon's 2026 notice says eligibility is unchanged.⁵
• Keep a valid reference price. Every Amazon deal shows a verified reference price.⁹ Since April 23, 2026, a List Price must be backed by Featured Offer sales or another retailer at that price. Since May 18, Typical Price (the 90-day median) counts your promotional sales too once you're below it for more than 45 of 90 days.¹⁰ A long discount lowers the reference, and the deal has to go deeper to show its savings.
• Plan for 4 stars. Amazon's floor for any promotion is 2.5 stars on at least 5 reviews with no high return rate, and it says some deal types set a higher bar.⁷ For a badged event deal, plan for 4 stars or better.

Outside prices: 3P and 1P differ

• 3P: don't overshoot on the way back up. Amazon's Marketplace Fair Pricing Policy covers a price "significantly higher than recent prices offered on or off Amazon," and can cost you the Featured Offer.^11,12 Amazon publishes no threshold, so go back to the old price, not above it.
• 3P: you set the price, and Amazon checks it against other stores. An offer counts as competitive only at or below the Competitive External Price, the lowest price at other major retailers, and Amazon can remove the Featured Offer from one that isn't.¹² Pricing Health in Seller Central lists offers that lost it, and those within 5%.
• 1P: Amazon sets the price. Vendors don't lose the Buy Box this way. Amazon prices the item itself, so a sale left running on your own site or at Walmart tends to pull the Amazon price down with it, and the margin conversation follows.
• Win back event buyers without a public discount. Brand Tailored Promotions sends an offer to a chosen audience, such as recent customers or cart abandoners.¹³

Part 4 · Lever 3

Assortment: let the event tell you what to stock

• The first item new buyers chose is your entry product. Lead your remarketing with it.
• Baskets were small. Prime Day 2026's average order was $47.66, down from $53.34.¹⁴ A bundle lifts order value without a discount.

Part 5 · Lever 4

Visibility: spend the rank you earned, and take share

• Don't judge the event for 14 days. Sponsored Products and Brands credit a sale up to 14 days after the click, so event sales post until about October 21.¹⁵
• Remarketing windows. Sponsored Display reaches viewers from the last 7, 14, 30, 60 or 90 days.¹⁶ Use 7 to 14 for consumables and 30 or more for considered purchases.¹⁷
• Top 3 organically? Cut the bid. In eBay's field experiments, most ad spend went to buyers who would have purchased anyway.¹⁸

Conquesting: take the shoppers competitors can't serve

Your rank, reviews and stock peak after the event, and some competitors' bottom out. About 30% of online shoppers who hit an out-of-stock item buy another brand at the same retailer.¹⁹

• Let the numbers compare. Amazon's ad policy doesn't allow naming a competitor.²¹ 4.6 stars beside their 4.1 does it for you.
• Bid below your own terms. In Bing experiments, 20 to 47% of conquest clicks came back within 30 seconds, against 7% of a brand's own.²²
• Defend your name if a rival bids on it. Brands that stopped bidding on their own name lost 18 to 42% of those clicks to competitors.²³

Part 6 · Lever 5

Ratings: the reviews arrive after the halo

• New buyers spot what regulars stopped noticing. Across 7 brands, 40 to 55% of 1-star reviews traced to the listing instead of the product (our research).

Part 7

Both calendars

Count from the last day of the event.²⁶

Right now: Prime Big Deal Days to T12