MUUS

MUUS is a private investment group based in New York, established in 1998. The firm specializes in providing capital and operational resources to management teams that demonstrate exceptional potential. As a boutique investment manager, MUUS engages in a diverse range of investment activities, including public equity, private equity, real estate, commodities, and private debt opportunities. The executive management team oversees the firm's assets, ensuring a focused approach to investment that aligns with the firm's strategic objectives.

Michael Sonnenfeldt

Founder, Chairman and CEO

23 past transactions

Cache Energy

Seed Round in 2023
Cache Energy develops long-duration energy storage technology based on a thermo-chemical process that provides a cleaner alternative to fossil fuels. The system enables ultra-long duration storage with near-zero loss for months and is non-toxic, non-flammable and fire-retardant to facilitate safe transportation. The technology is suitable for a wide range of industrial applications and allows energy to be held and transported to where it is needed to power demand centers.

Sensera Systems

Series A in 2023
Sensera Systems designs and manufactures real-time jobsite intelligence solutions for owners, general contractors, and municipalities. Its platform combines self-contained solar-powered wireless camera hardware with cloud-based software, monitoring, and storage services, enabling clients to remotely observe construction sites and access project data. The solar/wireless IoT approach supports autonomous operation on the jobsite, reducing the need for wired infrastructure while delivering continuous monitoring and actionable insights. The company serves more than 1,000 general contractors and over 100 municipalities across the United States and Canada, delivering scalable solutions that enhance project visibility, safety, and compliance.

Bright Night

Venture Round in 2023
Bright Night specializes in renewable energy solutions that are both safe and reliable. The company focuses on providing clean, dispatchable power services to utility, commercial, and industrial customers. It is involved in the development, design, construction, and operation of renewable energy infrastructure, aiming to deliver high-value and low-cost energy. By targeting growing markets worldwide, Bright Night contributes to the transformation of electricity generation, storage, and distribution, promoting cleaner energy alternatives.

Aepnus Technology

Seed Round in 2023
Aepnus Technology develops electrolysis equipment designed to refine minerals and desalinate water. Its technology enables the production of low-cost electrified chemicals, facilitating the transition towards a carbon-free industry.

Harvest Thermal

Seed Round in 2022
Harvest Thermal develops a control system for home use that integrates heating, hot water, and cooling with thermal storage. Its Harvest Thermal Pod is a cloud-connected IoT device that is machine learning enabled. It aims to provide affordable and low-carbon heating, hot water, and cooling systems that reduce the impact on the planet while providing comfort and safer homes.

Railvision Analytics

Venture Round in 2022
RailVision Analytics is a Montréal-based company founded in 2019 that leverages artificial intelligence to enhance operational efficiency in the rail industry. The company's data analysis software is designed to reduce greenhouse gas emissions and fuel consumption while improving safety. By providing clients with access to digital data related to locomotive operations and personnel activities, RailVision Analytics enables them to optimize train performance and efficiency. Its innovative solutions aim to address critical challenges in the rail sector, contributing to more sustainable and safer rail transportation.

Tavour

Seed Round in 2022
Tavour is a Seattle-based online craft beer marketplace and delivery service. Through its web portal and mobile app, it curates and sells rare and newly released craft beers from across the United States, enabling customers to discover, purchase, and have beers delivered to their doorstep. The platform targets beer enthusiasts by offering a curated selection of hard-to-find options and local favorites, connecting brewers directly with consumers.

ARX Alliance

Convertible Note in 2022
ARX Alliance operates a B2B third-party risk management platform that focuses on cybersecurity and ESG vulnerabilities. The software is designed to help organizations assess their own security posture as well as that of their suppliers, providing a user-friendly interface that simplifies the complex domains of cybersecurity and risk management. Through comprehensive vulnerability scans, breach insights, and risk audits, ARX delivers intuitive reports, benchmarks, and actionable guidance to enhance cybersecurity resilience. Its methodology, encapsulated in the Arx Standard™, is dynamic and adapts to the unique profiles of companies and the evolving cyber threat landscape. By linking corporate users with their suppliers, ARX enables effective monitoring of potential weaknesses within the supply chain, fostering a protective cyber-secure alliance that enhances overall security.

Amperon

Series A in 2022
Amperon is a technology company that provides real-time energy data forecasting and analytics using artificial intelligence and smart meter data. The platform delivers real-time electricity demand forecasts and grid intelligence for utilities, energy retailers, grid operators, and institutional traders to optimize operations, manage risks, and support decarbonization. By leveraging vast smart meter datasets, Amperon translates granular energy usage into actionable insights to improve grid reliability and reduce energy costs. The company is based in New York and serves clients across the energy sector.

3E Nano

Seed Round in 2022
Founded in 2006, 3E Nano develops and commercializes Diamond-Like Carbon (DLC) coatings for transparent media. These coatings are designed to control heat and light emission, targeting applications such as windows, windshields, greenhouses, and solar modules.

Utilidata

Series B in 2022
Utilidata develops energy software that optimizes power grids using real-time distributed intelligence. Its platform, Utilidata, analyzes grid conditions continuously, integrates renewable sources seamlessly, detects anomalies, and improves operational efficiency. Founded in 1983, the company is headquartered in Providence, Rhode Island.

ARX Alliance

Seed Round in 2022
ARX Alliance operates a B2B third-party risk management platform that focuses on cybersecurity and ESG vulnerabilities. The software is designed to help organizations assess their own security posture as well as that of their suppliers, providing a user-friendly interface that simplifies the complex domains of cybersecurity and risk management. Through comprehensive vulnerability scans, breach insights, and risk audits, ARX delivers intuitive reports, benchmarks, and actionable guidance to enhance cybersecurity resilience. Its methodology, encapsulated in the Arx Standard™, is dynamic and adapts to the unique profiles of companies and the evolving cyber threat landscape. By linking corporate users with their suppliers, ARX enables effective monitoring of potential weaknesses within the supply chain, fostering a protective cyber-secure alliance that enhances overall security.

Energetic Capital

Series A in 2021
Energetic Insurance, Inc. is an InsurTech company based in Boston, Massachusetts, founded in 2016. It specializes in providing solar insurance solutions that address credit and counterparty risks associated with commercial and industrial solar photovoltaic projects. The company offers a product called EneRate, which protects third-party solar developers and asset owners from repayment risks and revenue losses due to defaults on power purchase agreements (PPAs). Energetic Insurance employs a data-driven approach as a Managing General Underwriter, developing innovative risk management products that facilitate solar financing for unrated or below investment grade organizations. This enables solar project developers to undertake more projects and access capital by mitigating payment default risks, thereby enhancing project economics through lower interest rates and improved financial structuring.

Nth Cycle

Venture Round in 2021
Nth Cycle is a company specializing in metal processing technology. It collaborates with battery recyclers and miners to recover critical minerals from electronic waste and low-grade mine tailings using its proprietary electro-extraction method, offering an alternative to traditional hydrometallurgy and pyrometallurgy processes.

Monarch Tractor

Series A in 2021
Monarch Tractor is a company that specializes in the development of fully electric and autonomous tractors aimed at improving agricultural productivity, sustainability, and safety. These tractors significantly reduce reliance on fossil fuels, thereby decreasing greenhouse gas emissions and assisting farmers in achieving their sustainability objectives. By employing advanced sensors and machine learning, Monarch tractors navigate fields and monitor crop health autonomously, facilitating precision farming without the need for human intervention. Equipped with sophisticated technology, including cameras and sensors, these tractors collect and analyze data on crop health, soil conditions, and other critical variables, providing farmers with actionable insights to optimize their farming practices, enhance operational efficiency, and increase crop yields.

ARX Alliance

Pre Seed Round in 2020
ARX Alliance operates a B2B third-party risk management platform that focuses on cybersecurity and ESG vulnerabilities. The software is designed to help organizations assess their own security posture as well as that of their suppliers, providing a user-friendly interface that simplifies the complex domains of cybersecurity and risk management. Through comprehensive vulnerability scans, breach insights, and risk audits, ARX delivers intuitive reports, benchmarks, and actionable guidance to enhance cybersecurity resilience. Its methodology, encapsulated in the Arx Standard™, is dynamic and adapts to the unique profiles of companies and the evolving cyber threat landscape. By linking corporate users with their suppliers, ARX enables effective monitoring of potential weaknesses within the supply chain, fostering a protective cyber-secure alliance that enhances overall security.

Opentrons

Venture Round in 2019
Opentrons develops automated laboratory equipment that uses Python programming language to streamline scientific research processes. Their products aim to minimize human error and increase efficiency in running experiments.

Connect M Solutions

Venture Round in 2019
Connect M Solutions is a technology company focused on electrification and artificial intelligence. Originally established as an industrial Internet of Things (IoT) firm in India, the company has evolved to concentrate on the integration of advanced technology solutions that enhance efficiency and innovation in various sectors. With a commitment to leveraging AI and electrification, Connect M Solutions aims to drive transformative change and deliver impactful technological advancements.

Nautilus Labs

Series A in 2019
Founded in 2016, Nautilus Labs develops a platform that enhances maritime transportation through real-time vessel data analysis. It offers features like TrueVoyage for continuous reporting and ship performance monitoring, serving companies operating various vessel types. The platform aims to improve fleet efficiency and enable predictive decision-making.

Alpha Tau Medical

Venture Round in 2019
Alpha Tau Medical is an Israeli medical device company focused on research, development and commercialization of Alpha DaRT, a diffusing alpha-emitters radiation therapy for solid tumors. The technology delivers localized alpha radiation using interstitial seeds to target cancer cells while aiming to overcome the limitations of traditional alpha therapy. The company is headquartered in Tel Aviv and was founded in 2016, pursuing clinical development with its Alpha DaRT program.

Heliogen

Series A in 2018
Heliogen is a renewable energy technology company that develops concentrated solar technology. This AI-enabled modular system aims to provide near-24/7 carbon-free heat, power, or green hydrogen fuel at scale for heavy industry applications.

N-Drip

Series A in 2018
N-Drip specializes in gravity micro-irrigation systems for agriculture. Its innovative system enables precise irrigation with minimal water usage, eliminating the need for costly pumps and filters. This results in higher yields, reduced labor costs, and lower fertilizer expenses while promoting sustainable energy use.

Divergent

Series A in 2017
Divergent develops and manufactures 3D-printed cars and has created the Divergent Adaptive Production System (DAPS), an end-to-end software-hardware platform for industrial digital manufacturing. DAPS enables customers to design, additively manufacture, and automatically assemble complex vehicle structures for automotive, aerospace, and defense applications. The system aims to optimize designs, reduce material use, and eliminate upfront capital expenditure by removing tooling needs and dematerializing components, thereby improving manufacturing efficiency and environmental sustainability across vehicle programs. Divergent's approach targets radical reductions in cost and lead times while enabling scalable, custom manufacturing, addressing decarbonization and demand for lighter, stronger structures.
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