GMV, or gross merchandise value, is the total monetary value of goods and services transacted through a platform over a period, measured before the platform's own fees, before returns, and in several definitions before anyone has confirmed the buyer paid. It counts what moved, not what was earned.

The metric exists because marketplaces do not own most of what they sell. A retailer that buys stock and resells it can describe its scale with revenue. A marketplace collecting a commission on somebody else's sale cannot, because its revenue may be a low single-digit percentage of the activity it hosts. GMV measures the activity rather than the cut. No accounting standard defines it, no auditor signs it, and every company writes its own version.

The arithmetic

The base calculation is item price multiplied by units sold, summed across every transaction in the period. A marketplace processing 1,000 orders at an average of 50 dollars records 500,000 dollars in GMV. At a 10% commission, revenue is 50,000 dollars. The ratio between the two is the take rate, the number that converts merchandise value into a business.

Definitions separate over what sits inside that multiplication. Buyer-paid shipping is included by some platforms and stripped by others, and sales tax may be inside or outside. Discounts and platform-funded promotions may be deducted or ignored, which matters because a 40% discount either cuts GMV by 40% or leaves it untouched depending on whether list or paid price is counted. Cancellations and returns are almost never deducted, because the metric is struck at order placement and returns arrive weeks later.

Alibaba's annual report for the financial year ended March 2016, filed on Form 20-F, shows the detail involved. Its calculation for the China retail marketplaces included shipping charges paid by buyers to sellers, and excluded transactions in certain product categories above certain amounts, along with buyer activity above a daily threshold in those categories, described as a prudential measure against the influence of potentially fraudulent transactions. Those exclusions are policy choices, not accounting rules.

eBay went the opposite way for two decades. Until December 2021 it defined GMV as the value of all successfully closed transactions on its platforms regardless of whether the buyer and seller actually consummated the transaction. A listing that closed and was never paid for still counted. On 15 December 2021 eBay announced a revised definition covering all paid transactions inclusive of shipping fees and taxes, attributed the change to visibility gained from managing payments globally, and restated its historical metrics. The impact on previously reported figures was described as immaterial.

Where it appears in advertising

GMV enters advertising work in three distinct roles.

The first is denominator. Retail media networks are sized against the commerce beneath them, and the ratio of advertising revenue to merchandise value measures how heavily a retailer monetises its shoppers. Walmart chief financial officer John David Rainey said in February 2026 that Walmart Connect's advertising revenue as a percentage of gross merchandise value remained in the mid to low single digits, middle of the pack against competitors, while the global advertising business grew 46% to nearly 6.4 billion dollars. Shopify reported that merchant solutions revenue as a percentage of GMV, which it calls attach rate, reached 2.14% in the third quarter of 2022, the highest in its history to that point.

The second is billing base. Commission in affiliate and offsite retail media is charged against order value rather than media spend, so GMV becomes the amount the fee is levied on. Etsy's Offsite Ads charge 15% of an attributed order below a 10,000 dollar annual sales threshold and 12% above it, capped at 100 dollars per order. impact.com reported roughly 120 billion dollars in partner-referred gross merchandise value during 2025 across approximately 350,000 active partnerships, a figure describing commerce its infrastructure tracked rather than money it collected. That distinction runs through the whole affiliate category.

The third is bid target. TikTok's GMV Max optimises campaigns directly toward gross merchandise value, using available creative assets to assemble ads and adjusting both organic delivery and paid traffic. It attributes orders resulting from advertised products to the campaign, including orders originating from organic content and affiliate activity, an approach that can credit paid campaigns with sales driven elsewhere. It also drives seller diagnostics: TikTok Shop's five-agent dashboard, in beta since June 2026, has a Shop Insight Agent summarising GMV and traffic fluctuations alongside account health scores.

Origin and evolution

The term entered public markets with eBay, which needed a way to describe an auction business where the company touched a fee rather than the goods. Alibaba adopted it for the same reason: at an investor day in June 2016, founder Jack Ma said the company used GMV because it was following eBay's example.

Scale made the number a liability. Alibaba disclosed in May 2016 that the Securities and Exchange Commission had opened an investigation into possible violations of federal securities law, covering its consolidation practices, its accounting for the logistics venture Cainiao Network, related-party transactions, and its reporting of operating data from Singles Day. Alibaba had reported 14.3 billion dollars in Singles Day GMV in 2015. The following month it said GMV would be reported annually rather than quarterly.

Regulators then addressed the general problem. On 30 January 2020 the SEC issued interpretive release 33-10751, effective 25 February 2020, covering key performance indicators in management's discussion and analysis. It asks companies to define the metric, explain how it is calculated, state why it is useful to investors, and describe how management uses it. The guidance applies to GMV without naming it.

Not every large marketplace reports the figure. Amazon does not disclose GMV, publishing instead a worldwide seller unit mix showing the third-party share of paid units, which has run between 60% and 62% through 2025 and into 2026. Marketplace Pulse estimated Amazon's 2025 global GMV above 830 billion dollars, roughly 575 billion from third-party sellers. Those are outside estimates, not company figures.

Limitations and disputes

The central criticism is that GMV rewards inflation. Because returns and cancellations sit outside the headline number and revenue does not, a platform can grow merchandise value through discounting or category mix while margins fall. Critics of Singles Day reporting have long argued that pre-orders taken before the day, deferred refunds and transaction incentives lift the published total without corresponding economic activity.

The same weakness carries into campaign optimisation. TikTok's GMV Max Pro, announced on 28 July 2026, extends optimisation beyond ad spend to coupons, affiliate costs and platform commissions, moving the objective past top-line merchandise value. The reasoning is explicit: optimising toward GMV alone ignores discounting depth, affiliate payouts and the platform's own take, so a seller can hit a GMV target while losing money on every unit.

Coverage gaps are a second problem. TikTok Shop's off-site sales tool, documented in August 2026, reports off-site GMV, TikTok Shop GMV and the ratio between them, but its tracking covers only direct-to-consumer and Shopify sites, leaving sellers who also list on Amazon or Walmart blind to sales there. A low ratio may describe the measurement rather than the market.

Comparability is the third. Two platforms reporting 20% GMV growth may be counting different things, and nobody reconciles them.

Disambiguation

Revenue is what the platform keeps and recognises under accounting standards. GMV is what passed through it. For a marketplace the two differ by an order of magnitude; for a first-party retailer owning its inventory they converge.

Net merchandise value, or NMV, deducts returns, cancellations and unpaid orders. Fewer companies report it, and it is not directly comparable to GMV.

Gross transaction value and total payment volume apply the same gross concept to payments and services, where the object transacted is not merchandise. impact.com reports GMV and gross transactional value as separate lines.

Conversion value, the figure in an advertising platform's reporting column, fires at order confirmation and is attributed to a campaign. As the explainer on sale sets out, that event typically precedes shipment by days and revenue recognition by longer, while GMV counts the order at list price before returns, cancellations and fees.

Recent developments

Merchandise value keeps climbing where reported. Shopify said on 5 May 2026 that merchants transacted more than 100 billion dollars of GMV in the first quarter alone, with 34% revenue growth, against 56.2 billion dollars in a quarter in late 2023.

Agentic commerce has made the metric harder to attribute. OpenAI switched on Instant Checkout in ChatGPT with Stripe on 29 September 2025, and Google's Universal Commerce Protocol followed in January 2026, both routing purchases through interfaces outside a retailer's own analytics. Walmart disclosed in March 2026 that conversion inside the chatbot ran roughly three times lower than for shoppers who clicked through to its own site, and OpenAI wound the feature down. Analyst Andrew Lipsman had questioned the commercial viability of AI shopping agents in October 2025, arguing retailers have incentives to keep the customer relationship.

Measurement is being rebuilt around the gap. NIQ said on 2 September 2026 that it is building an agentic commerce measurement product with Similarweb, with an initial version due in the fourth quarter of 2026. Commerce data is also being sold as advertising infrastructure: Media.net's May 2026 partnership with the rewards platform Fetch draws on receipts covering 212 billion dollars of gross merchandise value annually.

Pressure on the metric grows with the money behind it. Omdia projected in September 2025 that retail media would take about 20% of global advertising revenue by 2030, exceeding 300 billion dollars, all of it priced against a merchandise base that nobody audits.

Timeline

  • 1998 to 1999: eBay begins reporting gross merchandise volume as a measure of marketplace scale
  • 9 November 2009: Alibaba launches the Singles Day shopping festival with 27 merchants
  • 19 September 2014: Alibaba lists in New York, with GMV as its headline scale metric
  • 11 November 2015: Alibaba reports 14.3 billion dollars in Singles Day GMV
  • 24 May 2016: Alibaba discloses an SEC investigation covering consolidation practices, Cainiao Network and Singles Day operating data
  • 14 June 2016: Alibaba says it will report GMV annually rather than quarterly
  • 11 November 2019: Alibaba reports 38.4 billion dollars in Singles Day GMV, up 26% year on year
  • 30 January 2020: The SEC issues interpretive release 33-10751 on key performance indicators, effective 25 February 2020
  • 15 December 2021: eBay changes its GMV definition to paid transactions inclusive of shipping and taxes, and restates historical metrics
  • 27 October 2022: Shopify reports a merchant solutions attach rate of 2.14% of GMV, its highest to that date
  • 29 September 2025: OpenAI launches Instant Checkout in ChatGPT with the Agentic Commerce Protocol
  • 5 May 2026: Shopify reports more than 100 billion dollars of GMV in a single quarter
  • 28 July 2026: TikTok announces GMV Max Pro, extending optimisation to coupons, affiliate costs and commissions
  • 2 September 2026: NIQ and Similarweb announce an agentic commerce measurement product for the fourth quarter of 2026

Summary

Who. Marketplaces, e-commerce platforms, retail media networks, affiliate networks and commerce data providers report GMV. Investors use it to size businesses that do not own their inventory, and advertisers encounter it as a bid objective, a commission base and a denominator for retail media pricing.

What. GMV is the total value of goods and services transacted through a platform in a period, calculated as price multiplied by units and summed, before the platform's fees and usually before returns and cancellations. It is not defined by any accounting standard, and inclusions for shipping, tax, discounts and unpaid orders vary by company.

When. The metric came out of eBay's marketplace reporting in the late 1990s, spread through Alibaba's 2014 listing, drew SEC scrutiny in 2016, and was addressed generally by SEC guidance on key performance indicators issued in January 2020. Definitions have continued to move, with eBay revising its own in December 2021.

Where. It appears in quarterly filings and press releases, in retail media rate cards and affiliate contracts where commission is charged on order value, and inside advertising platforms as an optimisation target, most visibly in TikTok's GMV Max products.

Why. GMV is the only common measure of the commerce that advertising sits on top of, which makes it the reference point for how heavily a retailer monetises its shoppers. It is also the easiest large number in commerce to inflate, because discounting, promotion, unpaid orders and returns can raise it without adding profit, and because nobody audits it.