At MUUS, we’re shaping a more sustainable future.


Our mission is to invest in, support, facilitate, and accelerate the decarbonization of our planet, and to positively impact society.

MUUS is a values-driven, privately-held, entrepreneurial investment company.

We use our skills, resources and network to invest in exciting, mission-driven opportunities that generate superior risk-adjusted returns.

We also work within the philanthropic, academic, cultural, and political spheres to realize a cleaner, safer, and healthier world.

“We began, in earnest, building our climate portfolio over a decade ago, because advancing climate solutions is the work we are called to do, and represents the investment opportunity of a lifetime.”

Michael Sonnenfeldt, MUUS Founder and Chairman, Tiger 21 Founder

Join our ever-expanding network of collaborators.