Fumiaki Koizumi
Executive Director @ Mercari
Tokyo, Japan
Fumiaki Koizumi is a seed investor at Mercari in Tokyo focused on Internet and E-Commerce. Fumiaki Koizumi - Executive Director @ Mercari
- Total investments:
- 20
- Last investment:
- Lead investor:
- 10%
Last updated:
For AI agents: llms.txt
Industries Fumiaki Koizumi invests in
Stages Fumiaki Koizumi invests in
Countries Fumiaki Koizumi invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $455k–$17M
- Series A
- $3.8M–$64M
- Venture - Series Unknown
- $3.2M–$13M
Investment Focus
Industry
- Internet 5 (25%)
- E-Commerce 4 (20%)
- Human Resources 3 (15%)
- Information Technology 3 (15%)
- Content 2 (10%)
Stage
- Seed 9 (45%)
- Series A 3 (15%)
- Venture - Series Unknown 3 (15%)
- Funding Round 2 (10%)
- Angel 1 (5%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| FinT operates SNS marketing businesses and young women's media. | Sep 18, 2026 | ||
| 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 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 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. | $13M / Venture - Series Unknown / Dec 14, 2020 | ||
| 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 is a community management firm. | Seed / Feb 27, 2020 | ||
| Attelu is a people analytics service that identifies, hires and retains active talent. | $455.5K / Seed / Feb 13, 2020 | ||
| manebi is an Career development support platform business to support human transformation. | Seed / Oct 15, 2019 | ||
| HERP is a recruitment management platform. | $63.6M / Series A / Aug 19, 2019 | ||
| Ukka is a Creating the ideal form of food and agriculture. | $16.6M / Seed / May 27, 2019 | ||
| See all 20 investments → | |||
Co-Investors
About Mercari
Mercari aims to provide a solution by enabling people to easily sell and purchase second-hand items in a mobile marketplace with their smartphones. Japan’s mobile shopping obsession is finally in the US. Mercari, the resale shopping app, is the country’s biggest community-powered shopping fair in the palm of your hands. The intuitive app lets youbuy and sell anything, from anywhere, in seconds from your phone: fashion, electronics, jewelry, console games, new, pre-owned and hand-made items, Mercari delivers. Listing your item is as simple as uploading a photo and adding a few details, with built-in features that help you easily print out shipping labels and quickly drop packages in the mail. Mercari’s sharing community grows larger and makes the world more sustainable every day.
Mercari Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Daisaku Harada
Executive Officer of Souzoh Inc.
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John Lagerling
Director and CBO
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Shintaro Yamada
Director / Founder
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Tatsuya Tsuruoka
Principal Software Engineer
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Tomokaz Saito
Corporate Legal Manager
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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 Series A stage. Most of the 20 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–$17M at Seed, $3.8M–$64M at Series A and $3.2M–$13M at Venture - Series Unknown. 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.
How do I contact Fumiaki Koizumi?
Public channels for Fumiaki Koizumi include LinkedIn and X (Twitter). For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Fumiaki Koizumi last invest?
The most recent investment recorded for Fumiaki Koizumi closed in Sep 2026. Shizune tracks 20 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 Oct 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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