15th Rock
VC Fund
Tokyo, Japan
15th Rock is a VC fund in Tokyo focused on Medical Device and Medical. 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.
- Total investments:
- 31
- Last investment:
- Lead investor:
- 19%
- Last fund:
Last updated:
For AI agents: llms.txt
Industries 15th Rock invests in
Stages 15th Rock invests in
Countries 15th Rock invests in
Round sizes
Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Round size
- Series A
- $1.4M–$50M
- Series B
- $1.2M–$54M
- Series C
- $32M–$45M
Investment Focus
Industry
- Medical Device 5 (16%)
- Medical 4 (13%)
- Artificial Intelligence 4 (13%)
- Robotics 3 (10%)
- Health Care 3 (10%)
Stage
- Series A 7 (23%)
- Series B 6 (19%)
- Series C 5 (16%)
- Seed 4 (13%)
- Funding Round 2 (6%)
Country
- Japan 14 (45%)
- United States 5 (16%)
- Canada 2 (6%)
- India 1 (3%)
- Belgium 1 (3%)
Team
| Name | Title | Investments | Links | |
|---|---|---|---|---|
Hayashizaki Wataru
Principal
|
Principal | Total investments: 1 | Find email |
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Metagen Therapeutics (MGTx) is a clinical-stage company operating Japan’s first GMP-compliant manufacturing platform for fecal microbiota transplantation (FMT) therapies. The company combines proprietary paired metagenomic datasets with AI/ML-driven donor-recipient matching to advance precision microbiome medicine across ulcerative colitis,immuno-oncology, and neurodegenerative disease. Headquartered in Tsuruoka, Japan, MGTx leverages a cross-border regulatory strategy spanning PMDA and FDA pathways, positioning it as a platform bridging Japanese clinical innovation with global market access. | $1.2M / Series B / Sep 04, 2026 | ||
| 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 is a fleet management and vehicle leasing company. | $4M / Series A / Mar 23, 2026 | ||
| 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 is an artificial intelligence firm that wants to combine VR, robots, and wearable computing to create solution. | Series A / Apr 08, 2025 | ||
| Cellid developing the waveguide-architecture display module for AR glasses and high-performance spatial recognition software. | $13.2M / Feb 06, 2025 | ||
| 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 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 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 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 | ||
| See all 31 investments → | |||
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FAQ
What does 15th Rock invest in?
15th Rock invests primarily in Medical Device, Medical and Artificial Intelligence startups, most often at Series A and Series B stage. Most of the 31 investments tracked by Shizune back companies in Japan. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What round sizes does 15th Rock invest in?
15th Rock typically joins rounds of $1.4M–$50M at Series A, $1.2M–$54M at Series B and $32M–$45M at Series C. These are whole funding-round sizes, not 15th Rock's own check, which is rarely disclosed: the 10th–90th percentile of the confirmed public funding rounds 15th Rock took part in.
How do I contact 15th Rock?
Public channels for 15th Rock include LinkedIn, X (Twitter) and the website linked on this profile. 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 Oct 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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