What sectors does MUUS focus on?

MUUS focuses on Cleantech, Climate Tech.

MUUS

Family office

13 people tracked

★ Follow + Add to CRM ⤳ Find an introduction

Find your way into MUUS

Your email: who you already know at MUUS, and who your contacts know
2nd- and 3rd-degree connections: people you know who worked, studied or invested with the MUUS team
Your LinkedIn: the connections who can make the intro for you

We rank every route by how warm it is, so you raise on warm intros instead of cold emails.

✨ Fox Verdict

Investment thesis

MUUS & Company serves as the family holding and investment vehicle of Michael Sonnenfeldt, founder of the TIGER 21 peer network. The firm leverages its network and resources to back mission-aligned opportunities aimed at delivering strong, risk-adjusted returns while supporting a brighter and more sustainable future. Its activities span entrepreneurial investing, philanthropy, and cultural endeavors, with stated investment focus areas including entrepreneurial ventures and climate-oriented companies. Michael Sonnenfeldt brings roughly 50 years of experience across real estate, private equity, and venture capital.

Invests inCleantech Climate Tech

Source: firm website, verified Oct 2, 2026.

Leave your own feedback

Instruments

Equity

Founded

1998

Tracked investments

Team · 13 people

from the firm's website

Michael W. Sonnenfeldt· Founder and Chairman

Founder and chairman of MUUS & Company, which he established in 1998 as his private investment holding company. A serial entrepreneur, investor, and philanthropist with roughly 50 years across real estate, private equity, and venture capital, he is best known for founding TIGER 21, a peer network for high-net-worth individuals.

Chris Wolff· Chief Investment Officer

Laura DiBonaventura· Principal, Climate Investments

Alan Mantel· Investment Committee Member

Dominique Pierro· Administrative Manager

Isaac Sonnenfeldt· Associate

Kathleen Dunleavy· Vice President

Kavita Patel· Portfolio Manager, Venture

Mary Beth Bruggeman· Philanthropic Advisor

Peter Joseph· Investment Committee Member

Rami Idriss· Investment Committee Member

Tani Brown· Head of Platform

Wendy Gartenberg· Chief Financial Officer

What they invest in

from 1 of 1 portfolio companies

Cleantech ×1Construction Tech ×1New Materials ×1

HQs:Canada×1

Investments · 1 tracked

founders shown can be your intro path

NxLitenxlite.com in

NxLite develops sustainable coatings and glazing solutions for building windows and glass to improve energy efficiency and reduce heating/cooling energy loss.

CleantechConstruction TechNew MaterialsToronto, CA

David Matherin

Co-investorsACT Venture Partners Backwards Capital Creative Ventures E8 Angels Earth Foundry Energy Foundry +4 more

Portfolio news

latest coverage across their companies

NxLite Raises $9.2M in Series A Funding

NxLite · finsmes.com · Oct 14, 2025

Frequently asked questions

What sectors does MUUS focus on?: MUUS focuses on Cleantech, Climate Tech.