US E-Commerce Competitive
Landscape 2025–2026

The US retail e-commerce market reached approximately $1.4 trillion in 2025.[BusinessWire] Amazon accounts for roughly 38–40% of that total — a figure that has remained broadly stable even as challenger platforms have grown in absolute terms.[Upcounting] Walmart ranks second in online retail by total sales among US retailers, with Apple, Home Depot, and Target following, though precise 2025 e-commerce share percentages for these players are not publicly disclosed by a single authoritative source.[BusinessWire]

What makes this concentration durable is not Amazon's product catalogue or its Prime membership — it is the logistics network. Amazon processes over 16 million daily orders through a fleet of 40,000 trucks and 110 aircraft, achieving same-day delivery in more than 1,000 US cities.[DeepResearch] That physical infrastructure cannot be replicated quickly, and Amazon has turned it into a revenue line by selling fulfilment services to the same sellers who list on competing platforms. The concentration is self-reinforcing: more sellers attract more buyers, which justifies more logistics investment, which attracts more sellers.

Shopify's position is frequently misread in this context. Its $292.3 billion in gross merchandise volume in 2024[ShipToMoon] does not represent a single platform competing with Amazon — it represents thousands of independent brand stores, collectively large but individually small. Shopify enables the long tail of e-commerce; it does not contest Amazon's core.

Amazon's acquisition engine runs on fulfilment speed and ecosystem depth. Same-day grocery delivery, 350 million listed products, 6.2 million active sellers, and the Rufus AI shopping assistant serving 250 million customers create a compound lock-in that price alone cannot break.[DeepResearch] When a shopper's default behaviour is to open Amazon before thinking about alternatives, switching cost is invisible — but real.

Walmart's answer is not to build a parallel internet infrastructure but to turn its 4,700 physical stores into a delivery advantage. Store-based fulfilment hubs compress last-mile delivery windows and lower per-order costs in ways that pure-play e-commerce operators cannot match.[BusinessWire] In digital grocery — the category where delivery speed matters most to customers — Walmart has made measurable ground. Its app consistently ranks in the top 25 downloads alongside Amazon, a signal that omnichannel convenience is sticky.[Mobiloud]

TikTok Shop competes on a different axis entirely: discovery rather than delivery. In 2024, 43.8% of US TikTok users completed a purchase on the platform, and 43% of Gen Z consumers now start product searches on TikTok rather than on Google or Amazon.[Mobiloud] The platform hit $500 million in Black Friday/Cyber Monday 2025 sales with 50% year-on-year buyer growth, and has since onboarded premium US brands including Skims, Glossier, and Sunglass Hut — a deliberate move away from the cheap-dupe positioning that constrained its early growth.[DinMo] Temu operates at the opposite end of the quality spectrum, winning purely on price. At $3 spatulas and below-cost promotional pricing, it topped global shopping app download charts for three consecutive years and reached 530 million monthly active users — but has no meaningful fulfilment speed, no seller ecosystem, and no content layer.[Mobiloud]

Walmart Marketplace charges no monthly subscription and maintains the lowest referral fee baseline among the major platforms — a deliberate seller acquisition strategy designed to pull merchants away from Amazon.[Webgility] Amazon counters with infrastructure value: its $39.99 monthly Professional plan unlocks up to 1.5 million free listings and access to a fulfilment network that ships 97%+ of orders on time.[Webgility] For most sellers, the Amazon fee premium is justified by volume — the platform's buyer traffic is simply larger than any alternative.

TikTok Shop made the most aggressive single pricing move: it raised its referral fee from 6% plus $0.30 per order (introduced April 2024) to 8% plus $0.30 per order in July 2024 — a 33% commission increase executed within four months of launch.[Webgility] The increase was timed to coincide with rapid GMV growth toward $15 billion in 2025 and signals a platform moving from seller subsidy to platform monetisation. eBay's fee structure — up to 13% final value fees on top of tiered monthly subscriptions — leaves it as the most expensive option for many categories, which partly explains its slow loss of mid-market sellers to Amazon and Walmart over the past several years.[Webgility]

Fulfilment costs tell a different story. Amazon's Multi-Channel Fulfilment charges $6.99 for a single small item but drops to $3.64 per unit for orders of four or more — rewarding volume and locking sellers into Amazon's logistics even when they list elsewhere.[CEDCommerce] Walmart Fulfilment Services undercuts Amazon on small items at $3.45–$4.95 but offers no comparable multi-unit discount, and critically, only supports Walmart Marketplace orders — limiting its utility for sellers who want to ship across multiple platforms.[CEDCommerce]

Amazon's Multi-Channel Fulfilment expansion is the most structurally significant move of the past 18 months. By 2025, Amazon was processing fulfilment orders originating from Shein, Walmart Marketplace, Shopify, TikTok Shop, and eBay — using unbranded packaging to comply with each platform's requirements while generating fee income and centralising inventory intelligence across the entire US e-commerce seller population.[CEDCommerce] The competitive intent is clear: Amazon is positioning itself as the logistics backbone that powers the industry, not just the marketplace that dominates it. A seller who ships through Amazon MCF is giving Amazon visibility into their order volumes, SKU performance, and customer geography — data that reinforces Amazon's ability to allocate its own marketplace resources.

TikTok Shop's 2025–2026 brand onboarding push represents a deliberate repositioning. The arrival of Skims, Glossier, and Sunglass Hut in official TikTok storefronts signals an intent to move beyond impulse purchases of unbranded goods toward a platform where premium brands drive discovery.[DinMo] The $500 million in Black Friday/Cyber Monday 2025 sales — with 50% buyer growth year-on-year — confirms that the social commerce format is working at meaningful scale. The open question is whether TikTok Shop can build the fulfilment reliability and return infrastructure that premium brands require for sustained presence.

Walmart's most significant structural asset in 2025–2026 is its stores, not its technology. With 4,700 US locations acting as fulfilment hubs, Walmart can offer compressed delivery windows at lower last-mile cost than any pure-play digital competitor. The acquisition of Vizio in early 2024 was a retail media play — connected-TV advertising inventory that generates margin from the same consumer relationships that drive in-store and online purchases. No major Walmart e-commerce acquisitions or platform partnerships were announced in the specific January 2025–mid-2026 window covered by available research.

The structural feature that most protects Amazon is not brand loyalty — it is that new entrants cannot replicate a national fulfilment network in three to five years at any practical cost. The capital investment required to build 40,000 trucks, 110 aircraft, and same-day capability across 1,000 cities creates a barrier that is effectively permanent for any company that does not already have comparable physical infrastructure.[DeepResearch] Walmart is the only US retailer with an existing physical network that could, over time, come close — and it is already using that network as its primary competitive lever.

Buyer power in e-commerce is high in theory — switching between platforms costs nothing — but low in practice, because the switching cost is time and habit, not money. Amazon has 105 million US monthly active users who default to the platform before searching elsewhere.[Mobiloud] That behavioural lock-in is more durable than any contractual barrier. The platforms most exposed to buyer switching are those that compete on price alone — Temu and Shein — because a slightly better price on a rival app is sufficient to shift a purchase.

The intensity of rivalry among existing competitors is high but asymmetric. Amazon, Walmart, TikTok Shop, and Temu are not fighting over the same customer in the same moment — they are competing on different purchase occasions: routine replenishment (Amazon/Walmart), discovery-led impulse buys (TikTok Shop), and lowest-cost planned purchases (Temu). That segmentation limits direct head-to-head competition, which is part of why no challenger has materially eroded Amazon's share despite years of investment.

The six platforms profiled below occupy genuinely different competitive positions. The critical observation is that Amazon's vulnerabilities — product discovery for new brands, price sensitivity at the low end — are precisely where TikTok Shop and Temu have built their strongest positions. But neither challenger has yet built the fulfilment infrastructure that would let it contest Amazon on its core.

Shopify is frequently counted as a competitor in market share discussions, but its role is more accurately described as infrastructure for the brands that do compete. A Shopify merchant is a seller who chooses not to be primarily Amazon-dependent — but that merchant still needs to solve fulfilment, and increasingly does so through Amazon MCF or Walmart Fulfilment Services, deepening dependence on the very platforms they are nominally avoiding.[CEDCommerce]

The same-day delivery coverage fight is effectively a two-company contest between Amazon and Walmart. Amazon operates same-day delivery in more than 1,000 US cities through 40,000 trucks and 110 aircraft.[DeepResearch] Walmart counters by using its 4,700 stores as the last-mile node, a model that costs less per order than Amazon's dedicated network but requires solving the in-store picking and inventory allocation challenge at scale. The consumer experience gap between the two is narrowing, particularly in grocery and household essentials — the categories where delivery timing matters most.

Social commerce monetisation is where Amazon is genuinely exposed. TikTok Shop is the first platform to build a discovery engine that intercepts purchase intent before it reaches Amazon — and it is doing so with the demographic that will dominate consumer spending for the next two decades. The 43% of Gen Z who start product searches on TikTok rather than Amazon or Google represents a behavioural shift that logistics investment alone cannot reverse.[Mobiloud] The open question is whether TikTok Shop can convert discovery into reliable fulfilment and returns — the point at which social commerce becomes a genuine substitute for Amazon rather than an entry channel that eventually routes back to it.

Third-party seller acquisition is the least visible but structurally most important battleground. Walmart Marketplace has grown to challenge Amazon by offering lower fees and no subscription, and is investing in Walmart Fulfilment Services as a competing infrastructure. Amazon's response — extending MCF to fulfil orders from Walmart, TikTok Shop, and eBay sellers — inverts the dynamic: Amazon is no longer threatened by sellers listing on other platforms, because Amazon captures the fulfilment fee regardless of where the sale originates.[CEDCommerce]

The base case reflects the structural reality: Amazon's logistics moat is real, its MCF monetisation of competitors' fulfilment is working, and no single challenger has the capital and execution to close the gap across all four competitive dimensions simultaneously. Walmart gains ground in omnichannel grocery; TikTok Shop expands its Gen Z buyer base; Temu sustains price-led volume — but none materially erodes Amazon's ~38–40% share within 18 months.

The bull case for challengers rests on two forces acting together: a US regulatory intervention that forces Amazon to separate its marketplace and fulfilment businesses (reducing the MCF advantage), and TikTok Shop successfully proving that social commerce converts at sufficient volume to attract premium brands at scale. Neither is probable in isolation over 18 months, but both are possible. The bear case for challengers is more straightforward — if tariff increases on Chinese goods raise Temu's and Shein's cost bases materially, and if TikTok faces further US regulatory pressure on data handling, both platforms could see their US growth stall simultaneously, leaving Amazon's dominance even more entrenched.