We help startups get ready
to take off on a global scale

Global Brain is an independent venture capital firm that aims to bring new
industries to the society through extensive hands-on support for
startups and open innovation with large corporations.

AUM
$2.6B+
Invested
$1.4B+
Deals
1,200+
Active Portfolio
400+
IPO
41
M&A
84

Mirrativ is newly listed on
TSE Growth Market.

As one of the largest mobile game streaming platforms in Japan, Mirrativ has achieved drastic growth through creating new communities and game experiences. Global Brain truly wishes Mirrativ even greater prosperity through its continuous endeavors such as new businesses based on its “All for Streamers” strategy.

Mirrativ, Inc.

TSE Growth Market

December 18, 2025

News

Press Release

GB Universe

Funds & Projects

We manage flagship funds funded by
institutional
investors and companies,
as well as CVC fund
and co-investment
projects with our partners.

Team

We are a team of globally prominent and
diverse
backgrounds, providing in-depth
support to
our portfolio companies.

Investors
75
Supporters
40
Fund Management
15
Operations
37
  • Naoki Sadakuni

    Naoki Sadakuni

    Venture Partner

  • Harue Hayashi

    Harue Hayashi

    Fund Management Group

    Partner

  • Kojiro Tanaka

    Kojiro Tanaka

    Investment Group

    Director

  • Takuya Hosomura

    Takuya Hosomura

    Investment Group

    Partner

  • Jiro Kumakura

    Jiro Kumakura

    Investment Group

    General Partner

  • Hogil Doh

    Hogil Doh

    Investment Group

    General Partner

  • Wataru Katagiri

    Wataru Katagiri

    Investment Group

    Principal

  • View full team