Region Deep-Dive
Japan
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Related platforms are listed under Platform intelligence. Every figure below can be checked in the expanded source text. Platform intelligence.
QHow large is the Japan ecommerce market, and how is it growing?
2024 B2C ecommerce ~¥26.1T (+5.1%, METI); penetration only ~9.78%—the lowest among major markets
Low single digits (+5.1% in 2024); low penetration implies large structural growth room
Expand: original global-report section (country/sub-market detail and sources)
5.2 Japan & South Korea
Japan: - 2024 B2C ecommerce about ¥26.1 trillion (+5.1%) (METI survey); ecommerce penetration only about 9.78% — the lowest among major markets, with ample room to grow. - Source: https://www.meti.go.jp/english/press/2025/0826_003.html ; https://en.jasec.or.jp/single-post/expansion-of-japan-s-e-commerce-market-size - Platforms: Amazon Japan, Rakuten, Yahoo! Shopping as the big three; Mercari (C2C) and ZOZOTOWN (fashion) as vertical leaders.
South Korea: - 2024 online-shopping transaction value ₩242.3 trillion (about $165.9B, +5.8%, a record); mobile ecommerce share is extremely high (~80%+). - Source: https://en.yna.co.kr/view/AEN20250204001900320 - Platforms: Coupang and Naver are in a "death match" (both set records in 2024); AliExpress and Temu combined sales in Korea are approaching ₩4 trillion. - Source: https://www.kedglobal.com/us/e-commerce/newsView/ked202501210003 ; https://www.56ok.com/topic/detail-593930-temu-aliexpress-hit-3b-in-south-korea-rival-local-ecommerce.html
QWhich are the Top 5 ecommerce platforms in Japan, and how do they rank?
Rakuten is #1 by disclosed GMV (¥6.35T); Amazon Japan has no official revenue and ranks #2 by estimates (ranking disputed); Yahoo Shopping (LY), Mercari (C2C), and ZOZOTOWN (fashion) complete the top 5; Temu/AliExpress are growing fast in cross-border but are not yet in the top 5.
Expand: original Top-5 report section (GMV / revenue / users / positioning tables)
5.1 Japan
Ranking basis: disclosed GMV first (only Rakuten discloses a large GMV), otherwise by revenue; Amazon Japan by third-party estimate. #1/#2 order is contested (see note).
| Rank | Platform | Company | Key data | Positioning & strengths |
|---|---|---|---|---|
| 1 | Rakuten Ichiba | Rakuten Group | Domestic ecommerce GMV ¥6.35T (FY2025 calendar year, about $41–42B); group revenue a record for 29 consecutive years | Japan’s largest marketplace; Rakuten points closed loop across ecommerce/finance (Card/Bank)/mobile |
| 2 | Amazon Japan | Amazon | 2025 sales +12% (est.); Chinese sellers as the main growth force | Full assortment+Prime next-day; strong in electronics/daily goods; ⚠️ some media claim it already topped Japan in 2025 (contested) |
| 3 | Yahoo! Shopping / LINE Yahoo | LY Corporation | Group FY2025 revenue a record (about ¥2.5T, Media & EC led); GMV not disclosed | Search+shopping+LINE+PayPay ecosystem; strong in fashion/lifestyle |
| 4 | Mercari | Mercari Inc | FY2025 (through Jun 2025) revenue ¥192.6B; cross-border GMV >¥90B | C2C second-hand leader; expanding into cross-border and finance (Merpay) |
| 5 | ZOZOTOWN | ZOZO Inc | FY2025 (through Mar 2025) GMV and EBITDA records; revenue about ¥185–190B | Japan’s #1 fashion ecommerce (D2C-led); ZOZOSUIT try-on tech; 2026 acquired fragrance platform COLORIA |
⚠️ Definition note: Rakuten is listed #1 by disclosed GMV (¥6.35T is the largest official platform GMV found); Amazon Japan has no official Japan revenue and is listed #2 by estimated growth — their 2025 ranking is contested. Temu/AliExpress cross-border is growing fast but has not yet entered the top five. Fiscal-year definitions differ (Rakuten calendar year / Mercari through June / ZOZO through March / LY through March); do not mix.
Sources (selected): Rakuten FY25 — https://www.chwang.com/news/203124666073 ; Rakuten official KPI — https://global.rakuten.com/corp/investors/assets/doc/documents/25Q2MAINPPT_S_E.pdf ; Mercari — https://www.wsj.com/market-data/quotes/JP/4385/financials/annual/income-statement ; ZOZO — https://za.investing.com/news/stock-market-news/earnings-call-transcript-zozos-q4-fy-2025-sees-record-gmv-ebitda-growth-93CH-4242673 ; METI official — https://www.meti.go.jp/english/press/2025/0826_003.html
QWhat is worth watching?
- #1/#2 ranking dispute: some media say Amazon Japan became Japan's #1 in 2025
- Temu/AliExpress growing fast in cross-border but not yet in the top 5—cross-border shock is the biggest variable
- Penetration only ~9.78% (lowest among major markets)—structural growth room
- Fiscal-year definitions differ (Rakuten calendar year / Mercari through June / ZOZO through March / LY through March); do not mix them
QWhat are the key insights?
- Rakuten's points system is a differentiation moat (ecommerce + finance + mobile closed loop)
- Amazon Japan's ranking is disputed (disclosed GMV vs estimated revenue)
- Japan's ecommerce penetration is the lowest among major markets (~9.78%)
QWhere does this evidence come from?
Underlying research documents for this region (with full source URLs):