# 15th Rock

> 15th Rock is a VC fund in Tokyo backing Health Care and Medical Device. See 30 investments, check sizes, portfolio and contact details. Updated Aug 2026.

- Type: VC Fund
- Location: Tokyo, Japan
- Total investments: 30
- Last investment: Jun 2026
- Lead investor: 17%
- Last fund: Oct 2022
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/company/15th-rock-ventures
- Website: https://www.15th-rock.com/
- Facebook: https://www.facebook.com/15throckventures

15th Rock is a VC fund in Tokyo focused on Health Care and Medical Device. 15th Rock Ventures are investing Human Augmentation and IT field to create better future and lead a fulfilling life for the coming era of the 100-year lifespan, and focuses on seed and pre-IPO investments in sectors such as robotics, electronics, AR/VR, brain-machine interface, biotechnology, and IT.

## Contacts

5 contacts available for 15th Rock. Shizune tracks 1 team members at 15th Rock. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-team-emails/15th-rock?utm_source=investor_profile

## Round sizes

| Stage | Round size |
| --- | --- |
| Series A | $1.4M–$50M |
| Series B | $12M–$54M |
| Series C | $32M–$709M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Health Care | 4 | 13% |
| Medical Device | 4 | 13% |
| Robotics | 3 | 10% |
| Artificial Intelligence | 3 | 10% |
| Mobile | 2 | 7% |

52 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series A | 6 | 20% |
| Series B | 5 | 17% |
| Series C | 5 | 17% |
| Seed | 4 | 13% |
| Funding Round | 3 | 10% |

8 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Japan | 12 | 40% |
| United States | 5 | 17% |
| Canada | 2 | 7% |
| India | 1 | 3% |
| Belgium | 1 | 3% |

6 countries tracked in total.

## Team

| Name | Title | Investments | Profile |
| --- | --- | --- | --- |
| Hayashizaki Wataru | Principal | 1 | https://shizune.co/investors/profile/hayashizaki-wataru |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| NEXT NEW WORLD | NEXT NEW WORLD develops and manufactures natural products with low impact on the environment. It uses sustainable Japanese silk to manufacture apparel and cosmetic products. | $1.5M | Series A | Jun 22, 2026 |  |
| LetzRyd | LetzRyd is a fleet management and vehicle leasing company. | $4M | Series A | Mar 23, 2026 |  |
| Siiibo | Siiibo is a developer of an information platform intended to help private investors and companies to issue and purchase private bonds easily. The company's platform is creating a free, transparent, and fair direct finance that provides opportunities for an advisory to companies, such as support for diversification of funding using smallprivate placement bonds, and for building relationships with investors, enabling the private investors to get familiar with the issuance of corporate bonds. |  | Venture - Series Unknown | Apr 16, 2025 |  |
| JIZAIE | JIZAIE is an artificial intelligence firm that wants to combine VR, robots, and wearable computing to create solution. |  | Series A | Apr 08, 2025 |  |
| Cellid | Cellid developing the waveguide-architecture display module for AR glasses and high-performance spatial recognition software. | $13.2M |  | Feb 06, 2025 |  |
| Nobi | Nobi is a smart lamp that ensures help can be provided in a flash in the event of a fall. It recognizes a fall, and it will notify a family member, contacts, or a specialized emergency call center. The lamp will then connect to that person to reassure them that help is on the way. If necessary, it can even unlock the smart lock on the front door. | $36.5M | Series B | Jan 28, 2025 |  |
| Nobi | Nobi is a smart lamp that ensures help can be provided in a flash in the event of a fall. It recognizes a fall, and it will notify a family member, contacts, or a specialized emergency call center. The lamp will then connect to that person to reassure them that help is on the way. If necessary, it can even unlock the smart lock on the front door. | $36.5M | Series B | Jan 28, 2025 |  |
| Pacific Meta | Pacific Meta is a tech startup that creates a web3 platform with the goal of offering guidance to businesses using blockchain technology. The firm platform aids in the product's localization for the Japanese market and offers community management services, enabling businesses to promote themselves on social media platforms and work withinfluencers in the cryptocurrency space. | $4.2M | Series A | Jan 23, 2025 |  |
| Proton Intelligence | Proton Intelligence provides biomarker monitoring to manage chronic disease and save lives. The first biomarker is potassium, targeting hyperkalemia in chronic kidney disease (CKD) patients who have additional co-morbidities ProtonIntel was founded in 2020 and was headquartered in Vancouver, Canada. | $7M | Seed | Dec 24, 2024 |  |
| EneCoat Technologies | EneCoat Technologies is working on materials development for perovskite solar cells and the commercialization of modules.EneCoat Technologies will create the future of energy through thin-film solar cells with the aims of protecting the environment and effectively utilizing natural energy sources. |  | Series C | Nov 11, 2024 |  |

10 of 30 investments shown.

## Co-investors
- [Mizuho Capital](https://shizune.co/investors/profile/mizuho-capital) — VC Fund, 4 deals together
- [BOM](https://shizune.co/investors/profile/brabantse-ontwikkelings-maatschappij-bom) — VC Fund, 3 deals together
- [DG VENTURES](https://shizune.co/investors/profile/dg-incubation) — VC Fund, 3 deals together
- [imec.xpand](https://shizune.co/investors/profile/imec-xpand) — VC Fund, 3 deals together
- [Innovation Industries](https://shizune.co/investors/profile/innovation-industries) — VC Fund, 3 deals together
- [Invest-NL](https://shizune.co/investors/profile/invest-nl) — VC Fund, 3 deals together

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## FAQ

### What does 15th Rock invest in?

15th Rock invests primarily in Health Care, Medical Device and Robotics startups, most often at Series A and Series B stage. Most of the 30 investments tracked by Shizune back companies in Japan. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is 15th Rock's check size?

15th Rock typically joins rounds of $1.4M–$50M at Series A, $12M–$54M at Series B and $32M–$709M at Series C. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds 15th Rock participates in.

### How do I contact 15th Rock?

Public channels for 15th Rock include LinkedIn, the website linked on this profile and Facebook. 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.

### Who are the partners at 15th Rock?

The team at 15th Rock includes Hayashizaki Wataru (Principal). The Team section lists each member with their title, investment count and links.

### 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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