The following list shows an up-to-date list of Japan’s most valuable web companies by market capitalization. It’s interesting to see 6 of them are large-cap (with 2 being very close). But 3 of these companies rather belong to the realm of financial services (the list includes companies, which are not exclusively engaged in Internet-related business).
The data comes from Netindex. Netindex offers an English version, which is not working at the moment.
I included English links whenever possible. No responsibility is taken for the correctness of this information.
1. Yahoo! Japan ($21.9 billion)
2. Softbank ($19.6 billion) – Telecommunications and Web business (top shareholder of Yahoo! Japan)
3. Rakuten ($6.1 billion) – Online shopping mall
4. DeNA ($2.3 billion) – Mobile web business and E-Commerce
5. Matsui ($2.1 billion) – Financial services
6. Monex Group ($1.2 billion) – Financial services (online only)
7. mixi ($980 million) – Social network and online employment services
8. kabu.com ($980 million) – Financial services (online only)
9. CyberAgent ($880 million) – Web media and advertising
10. eAccess ($740 million) – Broadband IP communication services
11. Internet Initiative Japan ($740 million) – Internet connectivity services
12. Kakuku.com ($720 million) – Online price comparison
13. Gourmet Navigator ($520 million) – Online restaurant information
14. ACCESS ($520 million) – Mobile software and web development
15. GMO Internet ($480 million) – Internet infrastructure and media business
16. Opt ($420 million) – Online marketing and advertising
17. ZAPPALLAS ($380 million) – Mobile software and web content development
18. en-japan ($340 million) – Online recruitment
19. Dwango ($330 million) – Web content and systems provider
20. Index Holdings ($325 million) – Mobile web content provider
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