Fundraising FoxMUUS
Family office13 people tracked
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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.
Source: firm website, verified Oct 2, 2026.
Team · 13 people
from the firm's website
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.
What they invest in
from 1 of 1 portfolio companiesCleantech ×1Construction Tech ×1New Materials ×1
HQs:Canada×1
Investments · 1 tracked
founders shown can be your intro path
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 PartnersBackwards CapitalCreative VenturesE8 AngelsEarth FoundryEnergy Foundry+4 more
Portfolio news
latest coverage across their companiesFrequently asked questions
- What sectors does MUUS focus on?
- MUUS focuses on Cleantech, Climate Tech.
- Who does MUUS co-invest with?
- MUUS most often shares deals with ACT Venture Partners, Backwards Capital, Creative Ventures, among 10 tracked co-investors.
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