A third-party seller on Amazon is any independent business or individual that lists and sells products directly to customers through Amazon’s marketplace, rather than Amazon itself stocking and selling the item. These sellers account for roughly 60% of all units sold on Amazon, meaning most of what you buy on the platform comes from an outside seller using Amazon as a storefront.
How Third-Party Selling Works
When you shop on Amazon, you’re dealing with one of two types of sellers. The first is Amazon itself, acting as a traditional retailer that buys inventory from brands at wholesale prices and resells it. Product pages where the “Sold by” line reads “Amazon.com” fall into this category, sometimes called first-party or 1P selling.
Third-party sellers, by contrast, are independent businesses that create their own product listings, set their own retail prices, and manage their own inventory. They sign up for Amazon’s Seller Central platform, choose either an Individual or Professional selling plan, and list products alongside everything else in Amazon’s catalog. When you buy from a third-party seller, Amazon processes the payment and takes a referral fee (typically 8% to 15% depending on the product category), but the seller keeps the remaining profit. You can always identify who’s actually selling a product by checking the “Sold by” information on any product listing page.
Who These Sellers Are
Third-party sellers range from solo entrepreneurs reselling goods they find at discount stores to major brands running their own Amazon storefronts. Some common types include small businesses selling handmade or niche products, manufacturers listing their own goods directly, retail arbitrage sellers who buy discounted items and resell them at market price, and private-label brands that design products and have them manufactured under their own brand name. The common thread is that none of them are Amazon. They’re outside businesses using Amazon’s marketplace as a sales channel.
How Shipping and Fulfillment Differ
One thing that confuses many shoppers is that a product can be “sold by” a third-party seller but still arrive in an Amazon-branded box with two-day Prime shipping. That’s because third-party sellers choose between two fulfillment methods, and the one they pick shapes your experience as a buyer.
Fulfillment by Amazon (FBA) means the seller ships their inventory to Amazon’s warehouses ahead of time. When you place an order, Amazon picks, packs, and ships it just like it would for products Amazon sells directly. FBA products automatically qualify for the Prime badge, so you get the same fast, free shipping you’d expect from any Prime-eligible item. Amazon also handles customer service and returns for FBA orders.
Fulfilled by Merchant (FBM) means the seller stores inventory in their own warehouse or facility and ships orders directly to you. This gives the seller more control over packaging and logistics, but shipping speeds vary. Some FBM sellers qualify for Seller Fulfilled Prime by proving they can meet Amazon’s delivery standards, which lets them display the Prime badge. Most FBM sellers, though, don’t carry the Prime badge, and delivery times may be longer.
From a practical standpoint, FBA orders feel identical to buying from Amazon directly. FBM orders may come in different packaging, take longer to arrive, and route you to the seller (rather than Amazon) for customer service issues.
Returns and Buyer Protections
Amazon requires third-party sellers to offer a return policy that is at least as generous as Amazon’s own policy. For most product categories, that means a minimum 30-day return window. If you buy from an FBA seller, Amazon processes the return exactly like any other Amazon purchase, since the inventory is already in Amazon’s system.
For FBM sellers, the process may look slightly different. You’ll typically initiate the return through your Amazon orders page, but the seller handles the logistics. If the seller is based internationally, Amazon’s policy requires them to provide either a domestic return address, a prepaid return shipping label, or a full refund without requiring you to send the item back.
All third-party purchases are also covered by Amazon’s A-to-Z Guarantee, which lets you file a claim if a seller fails to deliver your order, sends a product that’s materially different from what was described, or refuses a legitimate return. Amazon investigates the claim and can issue a refund from its own funds if the seller doesn’t resolve the issue.
How to Tell If You’re Buying From a Third Party
Every Amazon product page includes a “Sold by” and “Shipped by” line, usually located near the “Add to Cart” button or in the offer listing. If the “Sold by” name is anything other than “Amazon.com,” you’re buying from a third-party seller. The “Shipped by” line tells you who handles fulfillment. A listing that reads “Sold by [Business Name] and Fulfilled by Amazon” means it’s a third-party product using FBA. One that reads “Sold by and shipped by [Business Name]” is FBM.
You can click on the seller’s name to view their storefront page, which shows their feedback rating, the number of reviews from past buyers, and how long they’ve been selling on Amazon. Checking this profile is worth the few seconds it takes, especially for higher-priced purchases or sellers you haven’t bought from before.
Why It Matters for Shoppers
Buying from a third-party seller is perfectly normal on Amazon and often indistinguishable from buying directly from Amazon, particularly with FBA orders. But there are a few practical differences worth knowing. Product authenticity can vary, since third-party sellers source inventory independently. Amazon has programs like Brand Registry and Transparency to combat counterfeits, but the risk is higher with unknown sellers than with Amazon’s own retail inventory. Pricing can also differ: multiple third-party sellers may compete for the same product listing, and the seller who “wins the Buy Box” (the default Add to Cart option) isn’t always the cheapest. Scrolling down to “Other Sellers on Amazon” sometimes reveals a better deal.
Customer service experiences can also vary. FBA sellers route all support through Amazon’s standard channels, so you won’t notice a difference. With FBM sellers, response times and resolution quality depend on the individual business. Amazon’s seller performance metrics penalize sellers who respond slowly or handle issues poorly, which keeps most sellers accountable, but your experience may not be as seamless as dealing with Amazon directly.