# Fumiaki Koizumi

> Fumiaki Koizumi is a seed investor at Ietty (Tokyo) backing Internet and E-Commerce. See 19 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Ietty](https://shizune.co/investors/profile/ietty)
- Location: Tokyo, Japan
- Total investments: 19
- Last investment: Oct 2023
- Lead investor: 11%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/fumiaki/
- X (Twitter): https://twitter.com/koizumi

Fumiaki Koizumi is a seed investor at Ietty in Tokyo focused on Internet and E-Commerce. Fumiaki Koizumi - Executive Director @ Mercari

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $455k–$68M |
| Series A | $62M–$73M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Internet | 5 | 26% |
| E-Commerce | 4 | 21% |
| Human Resources | 3 | 16% |
| Information Technology | 3 | 16% |
| Content | 2 | 11% |

45 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 9 | 47% |
| Funding Round | 4 | 21% |
| Series A | 3 | 16% |
| Angel | 1 | 5% |
| Series B | 1 | 5% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Aoyama Arts | Aoyama Arts is an architecture and consulting company that develops design offices and supports land search and financing plans. | $804.4K | Seed | Oct 03, 2023 |  |
| FiT | FiT encourages the use of information technology in fitness to address industrial concerns. We will build a highly sustainable fitness facility using a business model that allows consumers to easily use the gym without being burdened by price or procedures, while also allowing owners to build a very successful business with low running costs. | $875.3K | Seed | Aug 24, 2022 |  |
| Fabric Tokyo | FABRIC TOKYO is a Japanese startup provides a direct-to-consumer custom-made apparel brand. (former-company name Lifestyle Design Co., Ltd.). It enables customers to save their sizes, idea fabrics, and favorite designs, allowing them to make their original clothing later.FABRIC TOKYO was founded in 2012 by Yuichiro Mori and is based in Tokyo,Japan. | $193.6M |  | Dec 14, 2020 |  |
| Luup | Luup is Japan's #1 e-scooter and e-bike sharing service provider. Luup currently operates in Tokyo, Osaka, Kyoto, and Yokohama, while planning to expand to other cities all over Japan. The service is based on a high-density port network, where anyone can rent and return to their original fleets. | $3.3M | Seed | Mar 01, 2020 |  |
| Osiro | Osiro is a community management firm. |  | Seed | Feb 27, 2020 |  |
| Attelu | Attelu is a people analytics service that identifies, hires and retains active talent. | $455.5K | Seed | Feb 13, 2020 |  |
| manebi | manebi is an Career development support platform business to support human transformation. |  | Seed | Oct 15, 2019 |  |
| HERP | HERP is a recruitment management platform. | $63.6M | Series A | Aug 19, 2019 |  |
| Ukka | Ukka is a Creating the ideal form of food and agriculture. | $16.6M | Seed | May 27, 2019 |  |
| Farmnote holdings Japan | Firm Note Holdings Co., Ltd., established in December 2016, is a pure holding company with SkyArc Co., Ltd., which operates the web integration business, and Farm Note Co., Ltd., which operates the agricultural IoT solution business. | $55.3M | Series B | Dec 21, 2018 |  |

10 of 19 investments shown.

## Co-investors
- [GMO VenturePartners](https://shizune.co/investors/profile/gmo-venturepartners) — VC Fund, 3 deals together
- [SMBC Venture Capital](https://shizune.co/investors/profile/smbc-venture-capital) — VC Fund, 3 deals together
- [Akatsuki Games Inc.](https://shizune.co/investors/profile/akatsuki-3) — VC Fund, 2 deals together
- [Bonds Investment Group](https://shizune.co/investors/profile/bonds-investment-group) — VC Fund, 2 deals together
- [Globis Capital Partners](https://shizune.co/investors/profile/globis-capital-partners) — VC Fund, 2 deals together
- [STRIVE](https://shizune.co/investors/profile/gree-ventures) — VC Fund, 2 deals together

## About Ietty

VC Fund · Tokyo, Japan

The Ietty platform seeks to link property agents with home-hunters. Unlike conventional estate agents - which expect users to enter numerous preference criteria each time - Ietty pulls information from a user's Facebook profile, which is linked to the platform. This allows agents to propose options based on criteria selected in advance. Userswho then visit a property will receive a reward of JPY1,000.

3 contacts available at Ietty.

| Name | Title | Profile |
| --- | --- | --- |
| Fumiaki Koizumi | Advisor | https://shizune.co/investors/profile/fumiaki-koizumi |
| Taihei Ogawa | Founder & CEO | https://shizune.co/investors/profile/taihei-ogawa |
| Takemi Ohama | Head of Technology | https://shizune.co/investors/profile/ohama-takemi |

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## FAQ

### What does Fumiaki Koizumi invest in?

Fumiaki Koizumi invests primarily in Internet, E-Commerce and Human Resources startups, most often at Seed and Funding Round stage. Most of the 19 investments tracked by Shizune back companies in Japan. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Fumiaki Koizumi's check size?

Fumiaki Koizumi typically joins rounds of $455k–$68M at Seed and $62M–$73M at Series A. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Fumiaki Koizumi participates in.

### When did Fumiaki Koizumi last invest?

The most recent investment recorded for Fumiaki Koizumi closed in Oct 2023. Shizune tracks 19 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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