# Koike Masahide

> Koike Masahide is a seed investor at CyberAgent (Tokyo) backing Social and E-Commerce. See 2 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [CyberAgent](https://shizune.co/investors/profile/cyberagent-2)
- Location: Tokyo, Japan
- Total investments: 2
- Last investment: Jul 2026
- Lead investor: 0%
- Last updated: Aug 2026
- Facebook: https://www.facebook.com/masahide.koike

Koike Masahide is a seed investor at CyberAgent in Tokyo focused on Social and E-Commerce. Graduated from Hosei University Department of Business Administration. In 1998, he joined Ogishima Shoji (currently Aia). Joined CyberAgent in 2001. 2011 Appointed President of AMoAd. In 2012, he became a director. Appointed as Managing Director in 2014. Appointed Director of AbemaTV in 2016.

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $645k–$3.4M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Social | 1 | 50% |
| E-Commerce | 1 | 50% |
| Mobile Apps | 1 | 50% |
| Cloud Security | 1 | 50% |
| Sustainability | 1 | 50% |

6 industries tracked in total.

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Sinumy | Sinumy develops touchless identity authentication technology and high-speed, high-precision position measurement technology. | $3.4M | Seed | Jul 29, 2026 |  |
| Gab | Gab is a company that works to solve social problems as well as develops and markets ethical products. | $645.5K | Seed | Jan 27, 2025 |  |

2 of 2 investments shown.

## Co-investors
- [Spurcle](https://shizune.co/investors/profile/sprucle) — VC Fund, 2 deals together
- [Miraidoa](https://shizune.co/investors/profile/future-venture-capital) — VC Fund, 1 deal together
- [G-STARTUP](https://shizune.co/investors/profile/g-startup) — VC Fund, 1 deal together
- [Hokuhoku Capital](https://shizune.co/investors/profile/hokuhoku-capital) — VC Fund, 1 deal together
- [Investment Lab](https://shizune.co/investors/profile/investment-lab) — VC Fund, 1 deal together
- [Kobe University Capital](https://shizune.co/investors/profile/kobe-university-capital-71a5) — VC Fund, 1 deal together

## About CyberAgent

VC Fund · Tokyo, Japan

CyberAgent, Inc. is mainly engaged in the integrated net business.The Company operates in five business segments. The Integrated Net Business segment is engaged in the advertisement agency business, the smart phone media business, as well as the sale of advertisements for smart phone. The Media Related segment is engaged in the social gamebusiness, the operation of mobile media and personal computer business. The Ameba Related segment is engaged in the operation of Websites Ameba and Ameba Pigg.

5 contacts available at CyberAgent.

| Name | Title | Profile |
| --- | --- | --- |
| Kazushi Fujita | Head of Retail Tech Div, AI Business Division | https://shizune.co/investors/profile/kazushi-fujita |
| Koike Masahide | Executive Officer | https://shizune.co/investors/profile/koike-masahide |
| Akshat Arora | Country Manager, US | https://shizune.co/investors/profile/akshat-arora |
| Atsushi Nakahashi | Brand Creative Department Creative director | https://shizune.co/investors/profile/atsushi-nakahashi |
| Go Nakayama | Managing Director | https://shizune.co/investors/profile/go-nakayama |

## Similar investors

### Similar industry
- [Antler](https://shizune.co/investors/profile/antler-be9c) — VC Fund
- [SOSV](https://shizune.co/investors/profile/sosv) — VC Fund
- [Breakthrough Energy Ventures](https://shizune.co/investors/profile/breakthrough-energy-ventures) — VC Fund

### Similar stage
- [Antler](https://shizune.co/investors/profile/antler-be9c) — VC Fund
- [Alumni Ventures](https://shizune.co/investors/profile/alumni-ventures-group) — VC Fund
- [Right Side Capital Management](https://shizune.co/investors/profile/right-side-capital-management) — VC Fund

### Similar country
- [Mitsubishi UFJ Capital](https://shizune.co/investors/profile/mitsubishi-ufj-capital) — VC Fund
- [SMBC Venture Capital](https://shizune.co/investors/profile/smbc-venture-capital) — VC Fund
- [Mizuho Capital](https://shizune.co/investors/profile/mizuho-capital) — VC Fund

## Featured in investor lists
- [Energy Angel Investors in Japan](https://shizune.co/investors/energy-angel-investors-japan)

## FAQ

### What does Koike Masahide invest in?

Koike Masahide invests primarily in Social, E-Commerce and Mobile Apps startups, most often at Seed stage. Most of the 2 investments tracked by Shizune back companies in Japan. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Koike Masahide's check size?

Koike Masahide typically joins rounds of $645k–$3.4M at Seed. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Koike Masahide participates in.

### When did Koike Masahide last invest?

The most recent investment recorded for Koike Masahide closed in Jul 2026. Shizune tracks 2 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.

# About Shizune
Shizune.co is an investor database. Core features:
- 48,091 startup investors (angels, VCs, accelerators, and others)
- Email, phone, LinkedIn (for intros), socials, and other contact data
- Updated daily from public funding news
- CSV and Excel export

The User can access the full database FOR FREE after signing up: shizune.co