Fundraising FoxMuus Climate Partners
Family officeNew York · Series A–Series B · 15 people tracked
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Investment thesis
MUUS Climate Partners channels the entrepreneurial, philanthropic, and cultural endeavors of Michael Sonnenfeldt and his family. Leveraging their network and resources, the firm invests in mission-aligned, sustainability-focused opportunities intended to deliver strong, risk-adjusted returns while contributing to a brighter, more sustainable future.
Source: firm website, verified Aug 7, 2026.
Team · 15 people
from the firm's website & public directories
What they invest in
from 7 of 8 portfolio companiesCleantech ×4Climate Tech ×4Energy ×3Fintech ×2Advanced Manufacturing ×1AgTech ×1AI & Machine Learning ×1Circular Economy ×1
HQs:United States×5Canada×1
Investments · 8 tracked
founders shown can be your intro pathBy year:2024 · 22023 · 22022 · 15 dated
Aepnus is developing a sulfate recycling process that regenerates chemicals on-site from sodium sulfate waste, with a planned demonstration-scale plant designed to process over 500 tonnes of sodium sulfate annually.
Circular EconomyCleantechNew Materials
Lukas Hackl(Founder)inBilen Akuzum(Founder)
Co-investorsClean Energy VenturesCollaborative FundISVLowercarbon CapitalNextFab VenturesThird Derivative+2 more
AmpUp develops electric vehicle charging infrastructure solutions for drivers, businesses, and communities.
Climate TechConsumerEnergyMobility & TransportationSaaSSan Francisco, US
Thomas Sun(Founder)inTom Sun(Founder)Xiaoyao QianRui ZhangBach Bui
Co-investors2.12 AngelsAutotech VenturesConnecticut InnovationsFoothill VenturesFrontier VenturesGoodyear Ventures+14 more
Dow Jones Reprints & Licensing provides transaction-based licensing of print and electronic reprints from Dow Jones publications such as The Wall Street Journal and Barron's.
Media & Entertainment
Co-investorsCapitalGNew York Life Insurance Company
Energetic Capital provides insurance and credit enhancement products for clean energy projects, using proprietary underwriting software and analytics to price project finance risk for developers, lenders, and other stakeholders.
CleantechClimate TechEnergyFintechInsurTechBoston, US
James Bowen(Executive Officer, Director, Promoter)inJeffrey McAulay(Executive Officer, Director, Promoter)
BoardJoshua Posamentier(Director)inWilliam Thorne(Director)
Co-investorsClocktower VenturesCongruent VenturesGreensoil PropTech VenturesMS&AD VenturesSE Ventures
Harvest Thermal makes an all-in-one home heating, cooling, and hot water system that pairs an air-to-water heat pump with an insulated thermal storage tank and optimization software to shift electricity use to cheaper, cleaner periods.
Advanced ManufacturingCleantechClimate TechEnergyHardwareKensington, US
JanePierreKen Munson(Executive Officer, Director)inElisabeth Jane Melia(Executive Officer, Director)
Co-investors37 AngelsAstiaBerkeley Angel NetworkClimate Impact CapitalCool Climate CollectiveDangerous Ventures+9 more
Niricson provides AI and machine learning-powered infrastructure inspection technology using robotics and computer vision to assess the condition of assets like bridges and dams.
AI & Machine LearningConstruction TechFintechRoboticsVictoria, CA
Harsh Rathod(Co-Founder and CEO)inAki Tomita(Co-Founder and CTO)inLaura di Bonaventura(Director)
Co-investorsTechstarsBentley iTwin VenturesCerity Partners VenturesForward Venture CapitalSwan Venture Fund
Critical minerals midstream refining company building modular technology to convert industrial scrap, black mass and primary feeds into refined nickel, cobalt, copper and rare earth products for Western supply chains.
Burlington, US
Megan O'Connor(Founder)inChad D. Vecitis, PhD(Co-Founder and Chief Scientist)Desirée Plata, PhD(Co-founder & Science Advisor)Gabi Knesel(Executive Officer)Chad Vecitis(Founder)
BoardRaffi Freeman(Executive Officer)in
Co-investorsAutodesk FoundationBroadscaleClean Energy VenturesVoLo Earth VenturesWovenEarthClean Energy Venture+2 more
Wildfire develops technology and solutions to help firefighters detect, control, and manage fires more effectively.
AgTechCleantechClimate TechDefense TechImpact & Social GoodBoulder, US
Steve Wolf(Founder & Inventor)inTim Krebs(Executive Officer)inAndrew Amalfitano(both officer and director)inBrett Kingstone(Executive Officer, Director)in
BoardDavid Blivin(Director)inLogan Grizzel(Director)
Co-investorsCottonwood Technology FundDraper AssociatesTechstarsQED InvestorsTransLink CapitalAlumni Ventures+1 more
Portfolio news
latest coverage across their companies
Nth Cycle · wastedive.com · Aug 25, 2026
Frequently asked questions
- How many investments has Muus Climate Partners made?
- Muus Climate Partners has 8 tracked investments, including 1 dated in the last 24 months.
- What stage does Muus Climate Partners invest at?
- Muus Climate Partners invests at the Series A, Series B stages.
- What sectors does Muus Climate Partners focus on?
- Muus Climate Partners focuses on Cleantech, Climate Tech, Energy, Impact & Social Good, New Materials.
- Where is Muus Climate Partners located?
- Muus Climate Partners is headquartered in New York, US.
- Who does Muus Climate Partners co-invest with?
- Muus Climate Partners most often shares deals with Broadscale, CapitalG, Clean Energy Ventures, among 7 tracked co-investors.
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