Updated:
MUUS Asset Management Co.
MUUS Asset Management Co. was established in 1998 by Michael Sonnenfeldt. The firm serves as the single family office for Sonnenfeldt and his wife Katja...
MUUS Asset Management Co.
MUUS Asset Management Co. was established in 1998 by Michael Sonnenfeldt. The firm serves as the single family office for Sonnenfeldt and his wife Katja Goldman. Wealth originated from Sonnenfeldt's ventures in real estate redevelopment and later renewable energy. The firm allocates across ClimateTech, Energy Transition & Renewables, PropTech, FinTech and InsurTech. Investment stages span Venture Capital, Growth, Buyout and Early Stage. Confirmed positions include Hyperlume Inc., acquired by Credo Technology Group, with co-investors ArcTern Ventures, BDC, SOSV, Intel Capital and LG. Activity centers on North America. Office count stands at one location in New York. Sonnenfeldt founded TIGER 21, a peer network that generates co-investment opportunities for members. The Goldman Sonnenfeldt Foundation handles separate philanthropic commitments. No operational events from the last 24 months appear in available records. The structure ties directly to Sonnenfeldt's founding of TIGER 21, creating a closed loop between the family office and the network for sourcing and governance. Philanthropy operates through a distinct foundation vehicle rather than inside the investment entity.
General information
Firm type
Single Family Office
Year founded
1998
Location
Region
North America
Country
United States
City
New York
Corporate office
New York, NY, United States
Principals
Michael Sonnenfeldt
Founder
Katja Goldman
Family Member
Sector focus
Frequently asked questions
Who runs investment decisions at MUUS Asset Management Co.?
Michael Sonnenfeldt serves as founder and directs capital allocation. Katja Goldman participates as family member in oversight of the office and related foundation.
How does MUUS Asset Management Co. source proprietary deal flow?
Sonnenfeldt's TIGER 21 network supplies co-investment opportunities. Direct relationships with venture firms such as ArcTern Ventures and Intel Capital generate additional access.
Does MUUS Asset Management Co. participate in fund commitments or only direct deals?
The firm uses direct co-investments and SPVs. It also maintains fund-of-funds exposure alongside private equity and venture commitments.
What investment stages does MUUS Asset Management Co. typically target?
Stages include Early Stage, Growth, Venture Capital and Buyout. Emphasis falls on climate technology and real-asset opportunities.
Where does the underlying wealth come from?
Wealth traces to Michael Sonnenfeldt's serial entrepreneurship in real estate redevelopment, private equity and renewable-energy ventures.
Does MUUS Asset Management Co. maintain philanthropic structures, and how are they separated?
The Goldman Sonnenfeldt Foundation operates as a distinct vehicle. It sits outside the investment mandate of the family office.
What is MUUS Asset Management Co.'s known posture on co-investments alongside external GPs?
The firm co-invests with named partners including ArcTern Ventures, Intel Capital, SOSV, BDC and LG in portfolio companies such as Hyperlume Inc.
Profile maintained by Altss using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Read the methodology. Last updated: . Continuous refresh with full update cycles at least every 30 days.
Need institutional-grade insight on family offices?
Altss delivers:
Prefer a guided tour?
We’ll walk you through: