# Hiroshi Oka

> Hiroshi Oka is a Series A investor at Spiral Capital backing Service Industry. See 12 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Spiral Capital](https://shizune.co/investors/profile/spiral-capital)
- Location: Tokyo, Japan
- Total investments: 12
- Last investment: Jul 2026
- Lead investor: 33%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/hiroshioka
- Website: https://x.com/okayoo930
- Facebook: https://www.facebook.com/hiroshi.oka
- AngelList: https://angel.co/hiroshi-oka

Hiroshi Oka is a Series A investor at Spiral Capital in Tokyo focused on Service Industry and Environmental Consulting. Hiroshi Oka is based out of Tokyo and is the General Partner of Spiral Regional Innovation Fund. Hiroshi previously worked at IMJ Corporation as a Leader. Hiroshi Oka attended Chiba University.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Service Industry | 2 | 17% |
| Environmental Consulting | 2 | 17% |
| B2C | 1 | 8% |
| Pet | 1 | 8% |
| Retail | 1 | 8% |

27 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series A | 3 | 25% |
| Series B | 3 | 25% |
| Seed | 2 | 17% |
| Series C | 1 | 8% |
| Venture - Series Unknown | 1 | 8% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Japan | 9 | 75% |
| Italy | 1 | 8% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Piece | Piece is a digital real estate investment platform offering the easiest and most transparent way to invest in income-producing real estate in Europe. Our mission is to make real estate ownership inclusive and more accessible. | $1.9M | Seed | Jul 13, 2026 |  |
| Space BD | Space BD aims to become a one-stop shop to respond to all issues related to industrialization of space, and alleviate the work of businesses that are developing new technologies. | $6.8M | Series C | Jun 17, 2026 |  |
| Space BD | Space BD aims to become a one-stop shop to respond to all issues related to industrialization of space, and alleviate the work of businesses that are developing new technologies. | $15.4M | Series C | Jan 23, 2026 |  |
| Ascend | Ascend is a logistics company. | $7.1M | Series B | Nov 13, 2025 |  |
| Otetsutabi | Otetsutabi is a regional revitalization platform that offers the opportunity for participants to help at accommodations and breweries in rural areas that struggle with seasonal labor shortages. The locals offer transportation expenses and places to stay in return, so participants can travel to the areas with ease. | $1.4M | Series A | Apr 30, 2025 |  |
| Inter Holding | Inter delivers solutions for global difficulties using vacuum technology, which uses a particular check valve to maintain a 99.5% vacuum rate. | $1.6M | Seed | May 08, 2024 |  |
| Emulsion Flow Technologies | Emulsion Flow Technologies offers rare metal recycling, utilizing emulsion flow technology, emulsion. | $9.2M | Series B | Mar 08, 2024 |  |
| Orosy | Orosy, a Tokyo-based company offering a wholesale marketplace for small retailers to discover and purchase makers, craft brands, smaller manufacturers. Orosy raised $3.4 million in Seed funding. | $2M | Series A | Feb 28, 2024 |  |
| Nealle | Nealle offers business development, business planning and consulting services. | $241M | Series A | Aug 01, 2023 |  |
| Nealle | Nealle offers business development, business planning and consulting services. |  | Series A | May 31, 2023 |  |

10 of 12 investments shown.

## Co-investors
- [Mitsubishi UFJ Capital](https://shizune.co/investors/profile/mitsubishi-ufj-capital) — VC Fund, 3 deals together
- [Mizuho Capital](https://shizune.co/investors/profile/mizuho-capital) — VC Fund, 3 deals together
- [Global Brain Corporation](https://shizune.co/investors/profile/global-brain-corporation) — VC Fund, 2 deals together
- [STRIVE](https://shizune.co/investors/profile/gree-ventures) — VC Fund, 2 deals together
- [GxPartners](https://shizune.co/investors/profile/gxpartners) — VC Fund, 2 deals together
- [Incubate Fund](https://shizune.co/investors/profile/incubate-fund) — VC Fund, 2 deals together

## About Spiral Capital

VC Fund · Tokyo, Japan

Spiral Capital is a venture capital fund.

3 contacts available at Spiral Capital.

| Name | Title | Profile |
| --- | --- | --- |
| Akitomo Naoi | Senior Associate | https://shizune.co/investors/profile/akitomo-naoi |
| Hiroshi Oka | Representative Partner | https://shizune.co/investors/profile/hiroshi-oka |
| Shuzo Ueki | Associate | https://shizune.co/investors/profile/shuzo-ueki |

## Similar investors

### Similar stage
- [Antler](https://shizune.co/investors/profile/antler-be9c) — VC Fund
- [Alumni Ventures](https://shizune.co/investors/profile/alumni-ventures-group) — VC Fund
- [General Catalyst](https://shizune.co/investors/profile/general-catalyst-partners) — VC Fund

## FAQ

### What does Hiroshi Oka invest in?

Hiroshi Oka invests primarily in Service Industry, Environmental Consulting and B2C startups, most often at Series A and Series B stage. Most of the 12 investments tracked by Shizune back companies in Japan. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did Hiroshi Oka last invest?

The most recent investment recorded for Hiroshi Oka closed in Jul 2026. Shizune tracks 12 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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