15th Rock

15th Rock, established in 2019 and headquartered in Tokyo, Japan, is a venture capital firm focusing on early-stage investments in human augmentation and consumer services. The company invests in sectors such as robotics, electronics, AR/VR, biotechnology, and IT, with a global investment scope including the United States, Canada, Europe, and Japan. Their investment strategy targets information technology, healthcare, consumer products, business products, and services, aiming to create a better future and enhance quality of life in the era of extended lifespans.

Tetsu Nakajima

Co-Founder, General Partner and Board Member

Hayashizaki Wataru

Principal

21 past transactions

Siiibo

Venture Round in 2025
Siiibo is a developer of an information platform designed to facilitate the issuance and purchase of private bonds for both private investors and companies. The platform aims to create a free, transparent, and equitable direct finance environment. It offers advisory services to companies, assisting them in diversifying their funding through small private placement bonds. Additionally, Siiibo helps build relationships between companies and investors, enabling private investors to gain familiarity with the corporate bond issuance process. Through its innovative approach, Siiibo seeks to streamline access to private bond markets and enhance investment opportunities.

JIZAIE

Series A in 2025
JIZAIE is an artificial intelligence company focused on creating innovative solutions that integrate virtual reality, robotics, and wearable computing. The firm has developed a real-time remote work platform specifically designed for essential and blue-collar workers. This platform serves as a remote control for heavy machinery and facilitates remote monitoring of traffic guidance sites and production line operations in food factories. By enabling businesses to manage work in challenging environments from a distance, JIZAIE aims to enhance operational safety and efficiency, thereby reducing the likelihood of accidents on-site.

Cellid

Venture Round in 2025
Cellid is a developer of hardware and software products focused on augmented reality technology. The company specializes in display modules, particularly waveguides, and spatial recognition engines designed for AR glasses. Its offerings include a range of products such as micro projectors, model builders, and position finders. These innovations enable users to interact with and recognize data related to human movement and environmental context, enhancing the overall augmented reality experience. Cellid aims to advance the capabilities of AR technology through its proprietary optical simulation and spatial recognition technologies.

Nobi

Series B in 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.

Pacific Meta

Series A in 2025
Pacific Meta is a technology startup focused on developing a web3 platform designed to assist businesses in utilizing blockchain technology. The company specializes in product localization for the Japanese market, ensuring that offerings are tailored to meet local preferences and requirements. Additionally, Pacific Meta provides community management services that help businesses enhance their presence on social media platforms and engage with influencers in the cryptocurrency sector. By combining these services, Pacific Meta aims to facilitate the promotion and marketing efforts of companies seeking to establish or expand their footprint in the blockchain space.

Proton Intelligence

Seed Round in 2024
Proton Intelligence, founded in 2020 and headquartered in Vancouver, Canada, specializes in biomarker monitoring to manage chronic diseases and enhance patient outcomes. The company focuses on continuous potassium monitoring, particularly for patients suffering from hyperkalemia associated with chronic kidney disease and other co-morbidities. Proton Intelligence's innovative platform provides accurate and real-time potassium measurements through interstitial fluid analysis, which correlates closely with blood levels. This capability is critical for enabling timely and informed decision-making regarding patient care, allowing clinicians and patients to effectively manage medications, dietary choices, and treatment options. By prioritizing precise monitoring, Proton Intelligence aims to significantly improve the health and lives of individuals affected by hyperkalemia.

EneCoat

Series C in 2024
EneCoat Technologies, established in 2018 and headquartered in Kyoto, Japan, specializes in the manufacturing and sale of perovskite solar cells and associated materials. The company focuses on developing and commercializing thin-film solar cell technologies, aiming to generate power even in low-light conditions. EneCoat's mission is to protect the environment and efficiently harness natural energy sources, enabling businesses to conveniently produce energy from solar cells.

Yamap

Series D in 2024
Yamap is an internet company focused on developing mobile applications tailored for mountain climbing and outdoor activities. The company's flagship application utilizes GPS technology to help users determine their location, even in areas without mobile phone service coverage. In addition to navigation, Yamap offers a variety of trekking-related products and services, enhancing the outdoor experience for mountaineers and trekkers. By combining advanced technology with a deep understanding of outdoor needs, Yamap supports enthusiasts in exploring and enjoying nature safely and effectively.

Ripcord

Venture Round in 2024
Ripcord, Inc. is a robotic digitization company that specializes in automating the management of paper records. Founded in 2014 and headquartered in Los Angeles, California, Ripcord develops a platform that utilizes advanced technologies, including artificial intelligence, machine learning, and vision-guided robotics, to create digital twins of physical documents. Its flagship solution, Canopy, captures, enriches, and organizes critical content, allowing enterprises to enhance their business processes with improved speed, quality, and accuracy. Formerly known as Ripcord Digital, Inc., the company rebranded in June 2017 to reflect its focus on innovative digitization solutions.

JIZAIE

Series A in 2024
JIZAIE is an artificial intelligence company focused on creating innovative solutions that integrate virtual reality, robotics, and wearable computing. The firm has developed a real-time remote work platform specifically designed for essential and blue-collar workers. This platform serves as a remote control for heavy machinery and facilitates remote monitoring of traffic guidance sites and production line operations in food factories. By enabling businesses to manage work in challenging environments from a distance, JIZAIE aims to enhance operational safety and efficiency, thereby reducing the likelihood of accidents on-site.

Onera Health

Series C in 2024
Onera Health, Inc. specializes in sleep diagnostic solutions and services aimed at identifying sleep disorders such as insomnia, sleep apnea, and narcolepsy. Founded in 2017 and headquartered in Palo Alto, California, with a research and development office in Eindhoven, the Netherlands, the company utilizes advanced sleep diagnostic patch systems that collect and analyze sleep data. These innovative solutions are designed to enhance patient care by providing comprehensive sleep test data to healthcare professionals across various settings, thereby improving the management of sleep-related ailments and potentially benefiting other medical fields through remote monitoring of chronic conditions. Onera Health's mission is to improve the health and quality of life for individuals struggling with sleep issues while also contributing to cost reductions in healthcare.

Better Place

Series B in 2023
Better Place is a company focused on creating a supportive environment for individuals working in sectors such as childcare and long-term care. By managing a defined benefit pension system, Better Place aims to enhance the welfare and financial security of those who contribute to societal development. The company's mission emphasizes the importance of kindness and aims to alleviate the financial concerns of employees, allowing them to work in their own way without the burden of monetary worries. Through its initiatives, Better Place seeks to ensure that clients can secure their employees' futures once they retire, thereby fostering a more compassionate and sustainable community.

Paradromics

Series A in 2023
Paradromics, Inc. is a company focused on developing advanced brain-machine interfaces aimed at transmitting data between the brain and external devices. Founded in 2015 and based in Austin, Texas, Paradromics manufactures implantable systems that facilitate neural data decoding, converting intricate neural recordings into data streams suitable for various neural prostheses. The company's technology is designed to enhance data transmission rates, providing high-volume, bidirectional data streaming capabilities. This innovation aims to assist individuals with neurodegenerative diseases and other neurological conditions by compensating for the loss of biological connectivity. In addition to its core products, Paradromics also develops applications to support its technology solutions.

Petokoto

Series A in 2021
Petokoto is a pet wellness company that creates and sells fresh food, runs pet media, and keeps pets happy. It is suitable to become an information source that combines accuracy, completeness, and updateability by utilizing the collective knowledge of experts both inside and outside the company and demonstrating their respective expertise. The company aims to develop a world where pets can be loved as family members.

Bisu

Seed Round in 2021
Bisu is a health technology company that offers a home health lab designed to enhance personal well-being through urine and saliva tests. Its devices monitor various health metrics, including dietary health, fat metabolism, and hydration levels, providing users with daily feedback on electrolytes, hydration, pH, ketones, and uric acid via a mobile application. This functionality enables individuals to track burned body fat, maintain metabolic health, achieve optimal ketosis, and improve physical endurance. Bisu has received recognition for its innovation, having been awarded by prestigious organizations such as Johnson & Johnson Innovation and MedTech Innovator, and it gained further acclaim at CES 2020 with the IHS Markit Innovation Award.

Onera Health

Series B in 2021
Onera Health, Inc. specializes in sleep diagnostic solutions and services aimed at identifying sleep disorders such as insomnia, sleep apnea, and narcolepsy. Founded in 2017 and headquartered in Palo Alto, California, with a research and development office in Eindhoven, the Netherlands, the company utilizes advanced sleep diagnostic patch systems that collect and analyze sleep data. These innovative solutions are designed to enhance patient care by providing comprehensive sleep test data to healthcare professionals across various settings, thereby improving the management of sleep-related ailments and potentially benefiting other medical fields through remote monitoring of chronic conditions. Onera Health's mission is to improve the health and quality of life for individuals struggling with sleep issues while also contributing to cost reductions in healthcare.

TENT Japan

Venture Round in 2021
TENT Japan operates an online platform that specializes in the rental of outdoor equipment and camping tents. The company focuses on providing a comprehensive product management and distribution system, alongside a rental-only inventory management tool that employs Radio-Frequency Identification (RFID) technology. This innovative approach aims to reduce the barriers to purchasing outdoor gear, promote sustainable consumption, and help minimize waste of goods and resources. Through its services, TENT Japan seeks to facilitate outdoor experiences while encouraging environmentally responsible practices.

Additive Manufacturing Technologies

Series A in 2021
Additive Manufacturing Technologies (AMT) specializes in automated post-processing technology aimed at enhancing the efficiency of additive manufacturing. The company's flagship platform, PostPro, significantly improves cost, quality, safety, and throughput in the production of 3D printed parts. By automating the manual and often expensive steps traditionally associated with legacy additive manufacturing, AMT enables facilities to scale up to high-volume production lines. Their innovative digital technology and comprehensive suite of post-production hardware facilitate the processing of 3D-printed polymer parts, allowing clients to reduce lead times and manufacturing costs effectively.

Longan Vision

Seed Round in 2020
Longan Vision, established in 2018 and headquartered in Hamilton, Canada, specializes in developing advanced goggles for firefighters. Their signature product, the Fusion Vision System, is a helmet-mounted augmented reality device that overlays thermal information onto the user's field of view, enabling firefighters to navigate low-visibility environments more efficiently and safely. This hands-free system aids in quick and accurate decision-making, helping first responders to locate victims and fire sources more effectively.

Sun Asterisk

Venture Round in 2020
Sun Asterisk is a digital creative studio focused on promoting industrial digitalization. The company offers services that support startups through various methodologies including design thinking, lean startup principles, and agile development. Additionally, Sun Asterisk provides recruiting services to help businesses find the talent they need.

Gojo & Company

Series C in 2019
Gojo & Company Inc. is a holding company based in Tokyo, Japan, that focuses on enhancing financial inclusion for underserved communities globally. Founded in 2014, the company operates through its subsidiaries, including Microfinance Delta International and Sejaya Micro Credit, to provide microfinance services. Gojo partners with financial service providers across 13 countries in Southeast Asia, South Asia, Central Asia, the Caucasus, and Africa. The company's mission is to ensure that individuals can transcend their circumstances and shape their futures by gaining access to quality and affordable financial services. Through its investments in microfinance institutions, Gojo aims to empower clients in developing regions to improve their lives and achieve financial stability.
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