# Siam Partners

Siam Partners is a Private Equity based in Tokyo, Japan.

## Overview

- **Organization type:** Private Equity
- **Headquarters:** Tokyo, Japan
- **Region:** Asia
- **Address:** Tokyo, Japan
- **Founded:** 2015
- **Assets under management:** Undisclosed
- **Website:** www.siampartners.jp
- **LinkedIn:** https://www.linkedin.com/company/siamcapital

## Regulatory record

- **Reports private funds:** No

## About

Siam Partners (株式会社サイアム・パートナーズ) provides investment banking services including cross-border and domestic M&A and capital alliance advisory and fundraising advisory. It also runs a hands-on investment fund business that invests in growth ventures and mature companies seeking Asia expansion and supports value-up, plus strategic consulting covering management strategy, M&A and restructuring, and business succession.

## Sectors

- Industrial Tech
- Enterprise Software
- Healthcare Services
- Manufacturing
- Consumer

## People

- Yasuhiro Oba — Managing Partner & CEO
- Tatsuo Kawasaki — Partner

## Questions

### Who runs investment decisions at Siam Partners?

Yasuhiro Oba is the Managing Partner and CEO, leading the investment committee. He founded Siam Partners in 2015 after leaving Unison Capital, where he gained mid-market buyout experience. Tatsuo Kawasaki serves as Partner with a focus on deal origination and operational value-creation planning.

### What is Siam Partners' typical check size and transaction type?

Siam Partners targets companies with enterprise values between ¥1 billion and ¥10 billion, writing control equity checks. The firm executes management buyouts and founder-succession transactions exclusively. It does not pursue minority growth investments, venture-stage deals, or public-to-private transactions.

### Does Siam Partners invest outside Japan?

The firm's primary focus is domestic Japanese SMEs. It will selectively evaluate cross-border opportunities where a Japanese company has an existing Asian subsidiary or where a deal facilitates a Japanese asset's regional expansion, but the core origination pipeline remains domestic succession situations.

### How does Siam Partners source its deals?

Siam Partners relies on a proprietary origination network built around regional banks, local accounting firms, and industry trade associations. Because the succession-driven sellers are often not running formal auction processes, these relationships allow the firm to engage founders before an asset reaches a broad sale process — functioning as a direct-sourcing intermediary.

### Which sectors does Siam Partners explicitly avoid?

Based on its transaction history and marketing materials, Siam Partners does not invest in real estate, financial services, or pure-play technology startups. The firm's mandate is concentrated on industrial manufacturing, enterprise services, healthcare, and consumer segments where physical operations and tangible assets underpin value.

## Related profiles

- [Shining Investment](https://altss.com/profile/shining-investment)
- [Sigma Partners](https://altss.com/profile/sigma-partners)

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Last updated: 2026-08-11T15:08:04.536Z

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