15th Rock
ACN Shibadaimon Building #617, 2-2-1 Shibadaimon, Minato-ku, Tokyo, Minato-ku, 105-0012, Japan
Overview
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
- 13
- Lead investments
- 0
- Investments · 12mo
- 2
- Active investors
- 0
Sector focus
- Artificial Intelligence (AI)
- Augmented Reality
- Automotive
- Electronics
- Robotics
- Wearables
Investment portfolio
- JIZAIE
Participated · Equity · Jul 2026
Jizaie provides a real-time remote operation and automation platform called JIZAIPAD for industries including construction, manufacturing, and logistics. The company offers remote video, AI analysis, and remote control technologies and emphasizes video compression and transmission that performs well in unstable network environments. Jizaie’s mission is to enable people to see, judge, and act on industrial sites without physical presence. It originated from the University of Tokyo’s Inami Lab and is led by CEO Junki Nakagawa. Current plans highlighted by the company include further development of AI video analysis, AI agents for decision support, and advancing remote control and automation for machinery and robots. Jizaie aims to strengthen regional alliances across Japan and expand its product development and business development teams.
- LetzRyd
Participated · Series A · Mar 2026
LetzRyd operates a technology-enabled, asset-backed platform supplying vehicles and drivers to ride-hailing companies while creating leasing pathways and partnerships that enable driver ownership. Operational since March 2024, the company says it has increased driver earnings by 20–22% in its first year and reduced driver attrition below industry benchmarks. It currently operates in three cities with a fleet of over 1,000 vehicles and has reported double-digit month-on-month growth. LetzRyd plans to use new capital to expand into additional urban markets, grow its vehicle base, enter new mobility segments, scale its operating platform, and enhance technology-led fleet and driver lifecycle management. The company is also prioritizing systems to improve vehicle utilization and service efficiency and expanding driver-focused initiatives to support financial stability and ownership opportunities.
- Cellid
Participated · Equity · Feb 2025
Cellid develops AR glass display modules and spatial recognition engines, leveraging optical simulation and proprietary production technologies. The company focuses on waveguides and spatial recognition technologies for new devices and has produced display modules as thin and lightweight as standard eyeglass lenses. It also offers spatial recognition solutions such as Cellid SLAM. Cellid raised over $7.5M in a Series C extension; with the latest investment it has raised over $15M to date. The company plans to use the funds to hire talent in Japan and internationally to improve development of key AR glass components, including micro projectors and waveguides. Cellid is led by CEO Satoshi Shiraga. Cellid Inc. develops displays for AR glasses and spatial recognition engines for next‑generation devices. The company says it has industry‑leading waveguide technology—claiming the world’s largest field of view, lightest weight waveguides—and the first full‑color projection technology using plastic materials. In November it released a Reference Design eyeglass‑type AR verification model that uses an optical see‑through waveguide, measures approximately 58g, and aims to reduce eye fatigue versus head‑mounted displays. Cellid also develops key components such as micro projectors and offers spatial recognition solutions including Cellid SLAM. The company plans to strengthen its product and reference‑design lineup, expand mass‑production capabilities, accelerate market launches, and hire top talent. Financially, the latest financing brings Cellid’s total funding to approximately USD 33 million (JPY 5.2 billion). Cellid designs and produces AR glass display modules—primarily waveguides—and spatial recognition engines for next-generation AR glasses. Its proprietary optical simulation and production technologies enable modules as thin and light as ordinary eyeglass lenses, with clear images and one of the world's largest fields of view for waveguides. The company also offers spatial recognition software such as Cellid SLAM and industry-specific solutions, combining hardware and real-world spatial recognition to blend physical and digital worlds. Cellid recently secured funding via a third-party allotment of new shares from General Interface Solution (GIS) and signed a strategic memorandum of understanding with GIS. Through the capital alliance and collaboration, Cellid aims to expand mass production, improve quality-control systems, and accelerate distribution of AR glasses. The partnership is intended to establish a stronger market position and drive cooperative growth.
- Nobi
Participated · Series B · Jan 2025
Nobi develops the AI Smart light designed to detect and prevent falls and support seniors both at home and in professional care environments. The lights operate in real time and process data locally to enhance privacy and reliability. Nobi’s AI model was trained over six years on more than 250,000 real-life situations. The company plans to use new funding to strengthen its market leadership in the UK and US and to add features that improve care home workflows. Headquartered in Antwerpen with offices in Belgium, the US, and the UK, Nobi’s solutions are available in more than 22 countries. Founded in 2018, the company currently employs 50 FTEs and intends to grow to 80 FTEs by the end of 2025. Nobi is a Belgian scaleup that produces a smart lamp designed to detect and help prevent falls among elderly people. The lamp targets residential care centres, assisted living facilities and private homes, and includes integrated communication technology that could enable applications for therapy follow-up and disease prevention. Nobi says the product helps accelerate response times for serious falls, aiming to improve outcomes and reduce healthcare costs. The company has raised €13 million to support expansion of partnerships with nursing homes, assisted living facilities and hospitals worldwide and to launch the product in people’s homes. Part of the funding will go toward redesigning the first-generation lamps to reduce unit cost despite rising raw material prices. Nobi plans to scale its team from about 10 employees to more than 40 by the end of 2022.
- Proton
Participated · Seed · Dec 2024
Proton is developing a small device designed to be inserted just below the skin to continuously monitor potassium levels and pair with a smartphone app for patient alerts. A clinician dashboard is planned so care teams can view potassium trends and fine-tune therapies, potentially reducing in-clinic potassium testing, time, and costs. The company targets patients with chronic kidney disease and those at risk of heart failure, where potassium imbalances can be life‑threatening. Clinical trials are underway for the product, which Proton says is due to launch in 2025. The founders are CEO Sahan Ranamukhaarachchi (based in Vancouver) and CSO Victor Cadarso (based in Melbourne); the company has a commercial HQ in Canada and an R&D subsidiary in Melbourne, Australia. Proton positions its approach against other emerging potassium-monitoring firms and claims greater scalability, usability, and clinical impact.
Team
No current team members are available.