Overview
Portfolio
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Mcj
Boston, United States
Early-stage fund focused on energy transition, climate impact, and industrial resilience, backing founders rewriting industries for cleaner, more profitable, and resilient outcomes.
Portfolio
21+
Employees
50+
Founded
2019
AUM
≈ $115.0M
Investment focus
Stages
No stages listed
Industries
No industries listedGeographic scope
United States
Fund details
Funds
Fund II
Vintage 2024 • $80.6M
Sources
Mcj
Early-stage fund focused on energy transition, climate impact, and industrial resilience, backing founders rewriting industries for cleaner, more profitable, and resilient outcomes.
Portfolio
21+
Employees
50+
Founded
2019
AUM
≈ $115.0M
Funds
Fund II · Vintage 2024 • $80.6M
Stages
No stages listed
Industries
No industries listedGeographic scope
United States
Sources
Showing 21 of 21 matched portfolio companies
Aalo manufactures compact nuclear reactors that utilize liquid metal coolant and UZrH fuel to achieve high energy density and simplified safety systems. These reactors can generate electricity at a target cost of 3¢ per kWh, providing a scalable solution for energy needs ranging from small data centers to large cities.
Funding: $133.3M
Rough estimate of the amount of funding raised
Funding: $133.3M
Rough estimate of the amount of funding raised
CHAI is an AI platform that utilizes techniques such as Reinforcement Learning from Human Feedback (RLHF) and long-context modeling to create engaging conversational agents. The platform addresses the challenge of generating AI interactions that are both factually accurate and socially entertaining, empowering users to create and share their own content.
Funding: $10.0M
Rough estimate of the amount of funding raised
Funding: $10.0M
Rough estimate of the amount of funding raised
Cirplus operates a B2B marketplace that connects businesses with a global network of suppliers for procuring certified recycled plastics at scale. By standardizing material data and facilitating supplier matchmaking, Cirplus addresses the challenge of sourcing high-quality circular materials for various industries, including packaging, automotive, and construction.
Funding: $3.7M
Rough estimate of the amount of funding raised
Funding: $3.7M
Rough estimate of the amount of funding raised
Euclid Power develops a project management platform specifically for renewable energy investments, enabling users to manage documents, details, and stakeholders in one centralized system. The platform addresses inefficiencies in project execution, reducing the risk of cancellations and minimizing sunk costs associated with delays in the approval process.
Funding: $5.2M
Rough estimate of the amount of funding raised
Funding: $5.2M
Rough estimate of the amount of funding raised
Exowatt develops modular, dispatchable energy systems designed to power AI infrastructure using solar energy. The system captures solar heat, stores it efficiently in a thermal battery, and converts it to on-demand electricity using a proprietary heat engine. This provides clean, 24-hour baseload power for data centers and utilities seeking reliable, scalable energy solutions.
Funding: $20.0M
Rough estimate of the amount of funding raised
Funding: $20.0M
Rough estimate of the amount of funding raised
Fourier develops modular, scalable systems for on-site, on-demand hydrogen production. This technology eliminates the logistical costs and safety concerns associated with transporting and storing hydrogen fuel. The company enables reliable, clean energy solutions for industrial feedstock, power backup, and renewable energy balancing.
LGND provides a platform for creating and managing geographic embeddings, enabling developers and analysts to build location-aware applications. Their services simplify the process of integrating spatial data into machine learning models, allowing businesses to leverage location intelligence for various use cases.
Light is a financial platform that automates general ledger management, accounts receivable, and accounts payable processes for multinational companies using AI-driven analytics and real-time reporting. This solution addresses the complexities of financial operations by streamlining compliance and enhancing efficiency across diverse currencies and regulatory environments.
Funding: $13.0M
Rough estimate of the amount of funding raised
Funding: $13.0M
Rough estimate of the amount of funding raised
Provides a shared progress tracking platform for coaches and clients, enabling clients to log actions, track goals, and maintain accountability between sessions. Coaches gain measurable insights into client progress and engagement through customizable logs, reminders, and real-time feedback tools, improving the effectiveness of their practice.
Mantel develops high‑temperature carbon capture materials that can be integrated into boilers, kilns, and furnaces. The technology enables efficient CO₂ removal directly within existing industrial heat processes, reducing emissions without compromising energy output. It targets sectors such as power generation, natural‑gas combined cycle, and bioenergy to support affordable, reliable clean energy.
Paces is a data insight platform that provides real-time analytics and human-verified datasets to help green infrastructure developers and investors assess site suitability and mitigate risks in renewable energy projects. By streamlining workflows from project origination to development, Paces addresses the challenge of securing financing for renewable energy initiatives in a competitive landscape.
Funding: $13.2M
Rough estimate of the amount of funding raised
Funding: $13.2M
Rough estimate of the amount of funding raised
Pacific Fusion is developing a modular pulsed magnetic inertial fusion system that generates more fusion energy output than the energy input, utilizing a fast electric pulser and small fusion chambers. This technology aims to provide affordable, reliable fusion power to meet the growing global energy demand and combat climate change.
Funding: $900.0M
Rough estimate of the amount of funding raised
Funding: $900.0M
Rough estimate of the amount of funding raised
Provides a verification platform for residential solar salespeople and installers, using government ID checks to create unique Recheck IDs that link each solar project to a verified individual. This system improves transparency and accountability in the solar sales process, reducing consumer complaints and enabling traceability for installers, finance companies, and regulators.
Reservoir partners with educational institutions and employers to provide individuals with a verified digital record of their academic and professional achievements. Users can instantly claim and securely store credentials like digital diplomas and work experience proof. This platform enables users to easily share authenticated credentials with third parties via email.
Rhizome provides an AI‑driven grid planning platform that combines high‑resolution climate projections, asset inventories, and equity metrics to produce asset‑level risk models for utilities. The web‑based tool continuously updates with new weather, grid, and load data, enabling utilities to pinpoint vulnerable components and prioritize resilient, equity‑focused investments while integrating with existing asset‑management systems.
Funding: $6.5M
Rough estimate of the amount of funding raised
Funding: $6.5M
Rough estimate of the amount of funding raised
Ro operates a telehealth platform that provides online clinics for weight loss, sexual health, hair restoration, and fertility management using clinically proven treatments and prescription medications. The service eliminates the need for insurance and offers free, discreet shipping, making healthcare accessible and convenient for over 2 million members.
SailPlan is a data platform that aggregates unstructured data from maritime operations to enhance efficiency and sustainability for shipowners, fleet operators, and governments. By providing precise analytics on emissions, fuel consumption, and engine performance, SailPlan enables users to reduce costs, improve compliance, and optimize maintenance strategies.
Funding: $17.5M
Rough estimate of the amount of funding raised
Funding: $17.5M
Rough estimate of the amount of funding raised
SPAN develops a smart electrical panel that provides real-time energy monitoring and control at the room and appliance level, enabling homeowners to optimize energy usage and reduce costs. The system integrates with existing home battery systems and electric vehicle chargers, addressing the need for efficient energy management in residential settings.
Funding: $235.9M
Rough estimate of the amount of funding raised
Funding: $235.9M
Rough estimate of the amount of funding raised
Telo provides a communication platform that utilizes WhatsApp to deliver personalized micro-capsules of educational content and operational updates to employees, ensuring high engagement and comprehension. This approach streamlines recruitment, onboarding, and internal communication processes, resulting in a 98% message open rate and significant cost savings for organizations.
Nuclear Software is a CI/CD platform designed for engineering simulation workflows. It automates and streamlines the simulation process, enabling faster iteration and improved accuracy in complex engineering projects.
Zeno provides a legal intelligence engine designed to enhance legal work through deep structural understanding of the law. It offers tools for deep research, precise legal risk assessment against established positions, and accurate document drafting with transparent reasoning and citations. This platform empowers legal professionals by embedding verifiable authority into every output, streamlining complex tasks without sacrificing quality or accuracy.