Mercari

メルカリ / 株式会社メルカリ

A dominant Japanese consumer-to-consumer marketplace leveraging proprietary transaction data and cloud AI to improve resale listings, search, fraud prevention, and credit decisions.

TSE: 4385 (Prime Market)
Profile as of September 12, 2026
#134 in the AsiaAI Tech Index
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Mercari is a large Japanese marketplace and fintech operator with a credible data advantage in resale search, recommendations, and AI-assisted credit. The central tension is that while it has a massive domestic data and liquidity moat, much of its AI stack depends on external cloud and model providers, leaving its revenue exposed to consumer-marketplace competition, credit risk, and platform regulation.

Key figures

Revenue FY2026: 229.293 billion yen
Revenue growth FY2026: 19.0%
Operating margin FY2026: 19.1%
Net income FY2026: 35.401 billion yen
R&D spend FY2026: Not disclosed
Capital expenditure FY2026: Not disclosed
Market capitalization 2026-09-09: 677.73 billion yen Estimate
Marketplace GMV FY2026: 1.286 trillion yen
Mercari Japan MAU FY2026: 24.1 million
Fintech credit balance FY2026: 358.1 billion yen
Mercari US GMV FY2026: US$810 million

Overview

Mercari is a Japanese consumer internet company whose core operation is the Mercari consumer-to-consumer marketplace. Founded in 2013 as Kouzoh, Inc., it has grown into Japan's dominant resale platform. Its adjacent businesses include merchant marketplace services, payments and credit through Merpay and Mercard, cryptoasset services through Mercoin, cross-border resale, on-demand work through Mercari Hallo, and mobile services.

Mercari is an independent listed parent of the Mercari Group, operating primarily in Japan and the United States. The company generates revenue predominantly from transaction fees paid by a fragmented seller base, generally charging a 10% fee on consumer-to-consumer and business-to-consumer transactions.

While it does not supply chips, servers, cloud capacity, or enterprise AI software, its structural position allows it to apply machine learning and generative AI inside a large consumer marketplace and credit ecosystem. This makes Mercari a significant downstream consumer of AI infrastructure, leveraging its massive proprietary dataset to improve liquidity, trust, and monetization.

The AI angle

Mercari does not supply chips, servers, cloud capacity, AI models for third parties, or enterprise AI software. Its AI relevance lies in applying machine learning and generative AI inside a large consumer marketplace and credit ecosystem.

Its named AI products and capabilities include AI Listing Support, the Mercari AI Assistant, image search, fraud detection, personalized recommendations, price suggestions, natural-language search and filtering, customer-support automation, and AI-based credit assessment for Merpay and Mercard. AI Listing Support generates category suggestions, titles, descriptions, and pricing from product photographs. It uses GPT-4o mini, after an earlier GPT-4 implementation, and is deployed to more than 20 million users. Google Cloud reports that it cuts a typical listing workflow from five to ten minutes to about 15 seconds.

Mercari also uses image search, with Google Cloud’s Vertex AI and Vector Search supporting image-based retrieval, generating millions of searches and tens of thousands of transactions in its first months. Furthermore, Mercari’s R4D research organization is using more than 4 billion historical marketplace listings to develop a domain-specific generative-retrieval foundation model for high-precision search and recommendations in the secondary-distribution market through the GENIAC project.

Technology and moat

Mercari’s primary technical advantage is the combination of marketplace scale, user liquidity, historical transaction data, identity and rating data, item-image data, shipping integrations, payment behavior, and credit performance. The company reports more than 4 billion accumulated listings and had more than 23 million domestic marketplace monthly active users in FY2025. That data can support specialized search, recommendation, fraud-detection, pricing, and credit models that a new marketplace cannot reproduce quickly.

The hard-to-copy component is not the generic AI software. GPT-class models, vector search, image search, and cloud infrastructure are available to other companies. The differentiator is the proprietary data loop: more listings improve search relevance, better search can raise conversion, more completed transactions create more pricing and trust data, and that data can improve recommendations, fraud controls, and credit decisions. Mercari identifies network effects in buyers, sellers, listings, transaction ratings, and liquidity as a core strength.

Five-pillar assessment

Scale and market position: Dominates the Japanese consumer resale market with an estimated 70% share, 24.1 million domestic monthly active users, and 1.286 trillion yen in FY2026 marketplace GMV.
Technology and R&D: Leverages a proprietary data loop of over 4 billion historical listings to train domain-specific generative-retrieval models, supported by Google Cloud and OpenAI infrastructure.
Supply-chain centrality: Relies on Google Cloud for infrastructure and Vertex AI, and OpenAI for GPT-4 models, while competing directly with Rakuten Group and LY Corporation.
Financial momentum: Strong FY2026 financial performance with revenue up 19.0% and operating profit up 57.7%, driven by domestic marketplace growth, expanding Fintech income, and US profitability.
Governance and quality: Independent listed company with a founder-CEO, a company-with-three-committees structure, and a board featuring multiple independent directors.

Supply chain and relationships

Mercari’s AI functions depend on cloud computing, GPU and accelerator capacity procured through cloud providers, foundation-model APIs or open models, data-labeling and evaluation tools, mobile-device imaging, and access to its proprietary marketplace data. Named upstream dependencies include Google Cloud, which supplies Google Kubernetes Engine, Vertex AI, Vector Search, and related cloud services. OpenAI is a disclosed technology provider for the GPT-4 and GPT-4o mini implementations used in AI Listing Support.

Mercari has not disclosed its GPU suppliers, server vendors, model-training hardware, semiconductor suppliers, total cloud spend, or the commercial terms of its AI-provider contracts. On the customer side, Mercari’s marketplace revenue is predominantly transaction fees paid by a highly fragmented seller base. The company generally charges sellers a 10% fee on consumer-to-consumer and business-to-consumer transactions, meaning it does not rely on a small number of concentrated enterprise customers.

Suppliers

Google CloudInfrastructure, Vertex AI, and Vector Search
OpenAIGPT-4 and GPT-4o mini for AI Listing Support

Competitors

Rakuten GroupInferredCompetes via Rakuma service
LY CorporationInferredCompetes via Yahoo Flea Market
eBayInferredCompetes with Mercari US
PoshmarkInferredCompetes with Mercari US

Geopolitics and risk

Mercari has low direct exposure to semiconductor export controls because it is not a chip manufacturer or direct exporter of advanced computing hardware. Its exposure is indirect through cloud AI infrastructure, model availability, and potential changes in accelerator supply or cloud pricing.

The company's geographic exposure spans Japan, the United States, cross-border consumer demand, and Indian development operations, but Japan remains the main earnings base. Its more material risks are regulatory and operational. Mercari processes identity, transaction, payment, credit, and behavioral data, making it sensitive to expanded Japanese privacy, data-governance, or financial-data requirements.

The US operation depends on US consumer spending, shipping economics, and digital-platform rules. Additionally, as Mercari expands international resale to Taiwan, Hong Kong, and the United States, it faces cross-border trade friction, including customs enforcement, product-safety rules, sanctions compliance, and shipping disruption.

Risk matrix
Risk	Severity	Why it matters
Marketplace fraud and counterfeit goods	High	Fraud, counterfeit goods, or account compromise can reduce GMV and invite regulatory scrutiny.
Japanese consumer-data regulation	High	Expanded privacy or financial-data requirements can raise compliance costs and constrain model training.
Credit losses and finance regulation	High	Deterioration in household credit quality can reduce lending profitability and require higher loss provisions.
AI-model governance and copyright	Medium	Errors, bias, or intellectual-property disputes could increase review and compliance costs.
Cloud-provider concentration	Medium	Outages or pricing changes from Google Cloud could affect marketplace reliability and AI-feature economics.
US consumer and trade-policy exposure	Medium	Mercari US depends on US consumer spending, shipping economics, and digital-platform rules.
Cross-border trade friction	Medium	Customs enforcement, product-safety rules, and shipping disruption can slow transaction growth.
Competition and commission pressure	Medium	Sustained price competition from Rakuma or Yahoo Flea Market may pressure Mercari's 10% seller-fee model.

Governance and ownership

Mercari is an independent Japanese listed company. It is not state-owned, state-influenced, or part of a disclosed chaebol, keiretsu, or industrial conglomerate. The company operates under a company-with-three-committees governance model, which separates executive oversight from management execution through dedicated nominating, compensation, and audit committees.

Shintaro Yamada serves as founder, Director, Representative Executive Officer, and CEO. The board includes multiple independent directors, such as lead independent director Kazuhiko Toyama. Mercari reports under IFRS and allocates capital toward product investment, business expansion, and share buybacks, having completed a 10.0 billion yen share repurchase in 2026.

What to watch

Whether Mercari converts the GENIAC generative-retrieval project into a production search and recommendation system.
Whether Marketplace GMV maintains double-digit growth after the FY2026 increase of 14.7%.
Whether Fintech credit balance continues rising without a deterioration in collection performance or loan losses.
Whether Mercari US sustains positive GMV growth and profitability.
Whether the Mercari Global App expands cross-border transaction volume.
Whether AI listing, search, and fraud features produce disclosed increases in conversion or GMV.

Recent developments

September 9, 2026Selected for a GENIAC robotics foundation-model R&D project.
September 3, 2026Completed a 9.9997 billion yen buyback of 2,118,800 shares.
August 5, 2026Reported FY2026 revenue of 229.293 billion yen, up 19.0%, and operating profit of 43.905 billion yen, up 57.7%.
June 18, 2026Launched the Mercari Global App in the United States.
June 12, 2026Named Jeff LeBeau CEO of Mercari, Inc. (US), effective 2026-07-01.
June 4, 2026R4D organization selected for the METI and NEDO GENIAC program.

Coverage on AsiaAI.FYI

Can Anthropic Save Japan’s Three Largest Tech Giants From AI Obsolescence? August 14, 2026
Can US Sanctions Stop the Flow of CXMT and YMTC Chips Into the Grey Market? July 6, 2026

About this profile

Compiled with AI-assisted research from company filings, market data, and published reporting as of September 12, 2026, then reviewed by AsiaAI.FYI. Figures marked Estimate are not company-reported. Check primary filings before relying on any number.

Confidence: B. Revenue, profit, operating metrics, and leadership are supported by company documentation, while R&D spending, capital expenditure, and AI infrastructure spend are not disclosed.

Main sources: Mercari annual securities report; FY2026 results announcements; Google Cloud customer documentation; OpenAI customer documentation; MarketWatch and Morningstar market data.

All 71 sources

Position in the AI stack

Applies cloud-hosted AI and proprietary marketplace data to improve liquidity, trust, and monetization inside a large Japanese resale platform.

Legal name: Mercari, Inc.
Formerly: Kouzoh, Inc.
Headquarters: Minato-ku, Tokyo, Japan
Founded: 2013-02-01
Founders: Shintaro Yamada / 山田進太郎
Leadership: Shintaro Yamada / 山田進太郎, Director, Representative Executive Officer and CEO
Employees: 2,159 consolidated employees (2025-06-30)
Ownership: Publicly listed
Listings: TSE: 4385 (Prime Market)
Business: Consumer-to-consumer marketplace and fintech
Sector: Internet Platforms & Cloud
Website: about.mercari.com/en