# Seiho Investment Works

Seiho Investment Works is a Venture Capital based in Kyoto, Japan.

## Overview

- **Organization type:** Venture Capital
- **Headquarters:** Kyoto, Japan
- **Region:** Asia
- **Address:** 480 Kankoboko-cho, Muromachi-dori Ayanokoji-sagaru, Shimogyo-ku, Kyoto, Japan
- **Founded:** 2017
- **Assets under management:** Undisclosed
- **Website:** siwi.info
- **LinkedIn:** https://www.linkedin.com/company/seiho-investment-works

## Regulatory record

- **Reports private funds:** No

## About

Seiho Investment is a venture capital firm based in Tokyo, Japan. Founded in 2017, the company invests in small and medium-sized companies. Seiho Investment has made 29 investments, including a Series B investment in SecureNavi on November 06, 2025.

## Sectors

- Enterprise Software
- Digital Health
- AI/ML
- Deep Tech
- Biotech

## Offices

- Shibuya, Tokyo, Japan

## People

- Hyoma Seki — CEO & Representative Director
- Yasuji Kan — Portfolio Manager
- Tomoki Oka — Senior Associate
- Ryusei Kurosaka — Associate
- Daiju Nei — Director of Finance
- Masaaki Nishiguchi — External Director
- Takatomo Tanaka — Auditor

## Questions

### Who makes the investment decisions at Seiho Investment Works?

Hyoma Seki, as CEO and Representative Director, leads the investment team. The firm's weekly investment committee includes External Director Masaaki Nishiguchi — who brings M&A advisory expertise — and Auditor Takatomo Tanaka, a partner at Nakanoshima Chuo Law Office, who provides legal oversight during deal discussions.

### What is Seiho Investment Works' typical check size and stage focus?

Initial investments range from ¥10 million to ¥100 million, targeting seed to early-stage companies. The firm is sector-agnostic within technology, covering healthcare, biotech, consumer IT, enterprise IT, and deep tech, all within Japan.

### Where does Seiho Investment Works source its deals?

Deal flow comes primarily through the team's networks in Kansai and Tokyo, anchored by the principals' long tenure at Osaka Small and Medium Business Investment & Consultation. External Director Masaaki Nishiguchi provides additional sourcing leverage through his M&A advisory relationships with large Osaka-based corporations.

### What governance mechanisms does Seiho Investment Works have in place?

The firm maintains a formal governance structure with a finance director overseeing cash management and reporting, an external M&A advisor participating in weekly investment committees, and a statutory legal auditor who attends board and investment committee meetings. It also operates an external whistleblowing contact via its auditor for harassment reporting.

## Related profiles

- [Theodorus](https://altss.com/profile/seido-capital)
- [SEII](https://altss.com/profile/seii)

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Last updated: 2026-06-03T20:00:00.000Z

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