# Primerock Investment

Primerock Investment is a Private Equity based in Tokyo, Japan.

## Overview

- **Organization type:** Private Equity
- **Headquarters:** Tokyo, Japan
- **Region:** Asia
- **Address:** 2-21-1 Shibuya, Hikarie Shibuya 8F Creative Lounge MOV, Shibuya-ku, Tokyo 150-0002, Japan
- **Founded:** 2016
- **Assets under management:** Undisclosed
- **Website:** primerock.co.jp
- **LinkedIn:** linkedin.com/company/primerock-investments-limited

## Regulatory record

- **Reports private funds:** No

## About

合同会社プライムロック・インベストメント is a capital-strategy partner that forms and manages investment funds and provides support through to stock-price formation. Unlike hands-on VCs, it generally does not take a direct role in investee-company management. It sets up dedicated funds for investees, supports their growth, and continues post-IPO support such as stock-price formation assistance. Business lines include fund management, third-party allotment underwriting, financial consulting, and full outsourcing of accounting/admin including CFO work.

## Sectors

- AI/ML
- Enterprise Software
- Mobility & Transportation
- Healthcare Services
- Digital Health
- Media & Entertainment

## People

- Kentaro Sugihara — Representative Partner

## Questions

### What is Primerock Investment's known portfolio track record?

Primerock led the VC round for Headwaters, which listed on the Tokyo Stock Exchange Mothers market in September 2020 and recorded the market’s highest-ever first-day price jump — an 11.9x increase over its IPO price. Other confirmed holdings include IDOM CaaS Technology (automotive subscriptions), Welmo (elderly-care DX), WASD (storefront DX), Connected Commerce (AI cafés), and Keywalker (big data).

## Related profiles

- [Primerica](https://altss.com/profile/primerica-financial-services)
- [Primer Sazze Partners](https://altss.com/profile/primer-sazze-partners)

---

Last updated: 2026-08-11T15:07:49.000Z

Canonical page: https://altss.com/profile/primerock-investment

Maintained by Altss — https://altss.com — methodology: https://altss.com/methodology