15th Rock is a venture capital firm. Based in Nishi-ku Yokohama, Japan. Among the 10 companies in the known portfolio are Gojo & Company, Pacific Meta, Proton Intelligence, JIZAIE, Siiibo and Cellid.
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Investment focus
- Sector
- AIHardwareHealthcare
- Focus
- AI ApplicationsAssistive TechnologyHuman AugmentationMedical DevicesRoboticsSensors
Contacts
Who to pitch at 15th Rock
15th Rock portfolio companies (10)
- Gojo & Company
- Pacific Meta
- Proton Intelligence
- JIZAIE
- Siiibo
- Cellid
- EneCoat Technologies
- LetzRyd
- Nobi
- YAMAP
Co-investors
Funds that share portfolio companies with 15th Rock.
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About 15th Rock
The firm's listing covers sectors AI, Hardware and Healthcare, and focus areas AI Applications, Assistive Technology, Human Augmentation and Medical Devices; known deals cluster at Growth, Seed and Series A.
The contacts to approach at 15th Rock are Tetsu Nakajima (Founding Partner) and Takeshi Minamoto (Founder&General Partner).
15th Rock shares portfolio companies with 20 other investment firms, among them Rheos Capital Works, DIMENSION and Fujitsu Ventures.
Frequently asked questions
What is 15th Rock?
15th Rock is a venture capital firm based in Nishi-ku Yokohama, Japan, with a known portfolio of 10 companies. The portfolio comes from public investment records rather than from the firm, so deals that never surfaced publicly are not in it.
What does 15th Rock invest in?
Listed sectors include AI, Hardware and Healthcare; listed focus areas include AI Applications, Assistive Technology, Human Augmentation and Medical Devices. Those tags come from the portfolio attached to the firm, so they describe what has been backed rather than a stated mandate for what comes next.
What stage does 15th Rock invest at?
The known deals of 15th Rock include Growth, Seed and Series A rounds. Check that against your own round before reaching out: stage mismatch is the most common reason a well matched sector still goes nowhere.
Who should I pitch at 15th Rock?
Both people on file at 15th Rock are listed as contacts for the firm, each with their own profile page.
How do I contact 15th Rock?
Any email address on file for the firm is masked on this page and readable inside RaiseHunt after you create an account. The 2 people attached to the firm have their own pages, each showing whether an address is on file for them.
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Data: RaiseHunt investor dataset · Snapshot 5 September 2026 · How this data is built · Report a correction or request removal