# Koki Yabu

> Koki Yabu is a angel investor at Mobcast Group (Tokyo) backing Content and Finance. See 3 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Mobcast Group](https://shizune.co/investors/profile/mobcast-inc)
- Location: Tokyo, Japan
- Total investments: 3
- Last investment: Jun 2015
- Lead investor: 33%
- Last updated: Aug 2026
- X (Twitter): http://twitter.com/@Yabcast1970
- Facebook: http://www.facebook.com/koki.yabu?sk=wall

Koki Yabu is a angel investor at Mobcast Group in Tokyo focused on Content and Finance. Koki Yabu is Founder, President & CEO at Mobcast inc.

## Round sizes

| Stage | Round size |
| --- | --- |
| Angel | $1.7M–$3M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Content | 1 | 33% |
| Finance | 1 | 33% |
| Data Mining | 1 | 33% |
| Video Games | 1 | 33% |
| Social Media | 1 | 33% |

8 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Angel | 1 | 33% |
| Pre-Seed | 1 | 33% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| SmartApp Japan | Smart Apps is a developer of a blockchain services application designed for smartphones. The company's application uses cryptocurrency technology to offer token issuance, initial coin offering and dApps design support, providing a launchpad for start-up blockchain-related businesses. | $4.9M | Pre-Seed | Jun 01, 2015 |  |
| Mobcast Group | mobcast is a sports entertainment company that operates a mobile entertainment platform for smartphones and feature phones. It supports customers with social game and social media services. The company was founded in 2009 and is based in Tokyo, Japan. Currently, it operates as a subsidiary of mobcast Inc. | $1.7M | Angel | Jun 30, 2010 |  |
| Mobcast Group | mobcast is a sports entertainment company that operates a mobile entertainment platform for smartphones and feature phones. It supports customers with social game and social media services. The company was founded in 2009 and is based in Tokyo, Japan. Currently, it operates as a subsidiary of mobcast Inc. | $3M | Angel | May 29, 2009 |  |

3 of 3 investments shown.

## Co-investors
- [East Ventures](https://shizune.co/investors/profile/east-ventures) — VC Fund, 1 deal together

## About Mobcast Group

VC Fund · Tokyo, Japan

mobcast is a sports entertainment company that operates a mobile entertainment platform for smartphones and feature phones. It supports customers with social game and social media services. The company was founded in 2009 and is based in Tokyo, Japan. Currently, it operates as a subsidiary of mobcast Inc.

5 contacts available at Mobcast Group.

| Name | Title | Profile |
| --- | --- | --- |
| Koki Yabu | Founder, President & CEO | https://shizune.co/investors/profile/koki-yabu |
| Fukumoto Takeshi | Directors CCO Game Business Division | https://shizune.co/investors/profile/fukumoto-takeshi |
| Takase Akira | Auditor | https://shizune.co/investors/profile/takase-akira |
| Takefumi Ishibashi | Director of Human Resources Division | https://shizune.co/investors/profile/takefumi-ishibashi |
| Tamaya Naohito | Director of Overseas Business | https://shizune.co/investors/profile/tamaya-naohito |

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## FAQ

### What does Koki Yabu invest in?

Koki Yabu invests primarily in Content, Finance and Data Mining startups, most often at Angel and Pre-Seed stage. Most of the 3 investments tracked by Shizune back companies in Japan. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Koki Yabu's check size?

Koki Yabu typically joins rounds of $1.7M–$3M at Angel. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Koki Yabu participates in.

### When did Koki Yabu last invest?

The most recent investment recorded for Koki Yabu closed in Jun 2015. Shizune tracks 3 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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