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Calamos Wealth Management
Calamos Wealth Management runs a $5B multi-family office in Naperville that draws on Calamos Investments research for direct and fund commitments.
Calamos Wealth Management
John P. Calamos Sr. established the wealth-management business in 2007 after decades of building Calamos Investments around convertible securities. The office operates as a multi-family platform that serves clients beyond the founding family while retaining access to the parent's research and product capabilities. Deployment spans private equity, venture capital, hedge funds, private credit, real estate, infrastructure, and digital assets. The firm executes through direct co-investments, SPVs, fund-of-funds commitments, and secondaries. Confirmed exposures include positions in FinTech, Industrial Tech, and Healthcare Services. Geographic reach covers North America, Europe, Asia, the Middle East, South America, and Oceania. Buyout, growth, and venture stages receive primary attention. The team sits in Naperville with no disclosed additional offices. John Koudounis serves as President and CEO of the parent while Joe Weidenbach heads the wealth unit. Adjacent vehicles include The John P. Calamos Foundation and holdings such as CityGate Centre and the National Hellenic Museum Collection. No operational events from the last 24 months appear in available records. The architecture differs from typical multi-family offices through its permanent link to a $40B asset manager and the founding family's board roles at The Hellenic Initiative and Economic Club of Chicago. This connection supplies proprietary research flow and co-investment access that standalone platforms rarely replicate.
General information
Firm type
Multi Family Office
Year founded
2007
AUM
$5B (Altss estimate)
Location
Region
North America
Country
United States
City
Naperville
Corporate office
Naperville, IL, United States
Principals
John P. Calamos Sr.
Founder, Chairman, and Global CIO of Calamos Investments
Altss tracks 2 additional named team members for this firm — including direct investment leads, IR, and operating principals not listed on the public website.
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Frequently asked questions
Who runs investment decisions at Calamos Wealth Management?
Joe Weidenbach heads the wealth unit. John P. Calamos Sr. and John Koudounis set broader portfolio direction through their roles at the parent Calamos Investments platform.
How does Calamos Wealth Management source proprietary deal flow?
The office accesses deal flow through the parent firm's research teams and board relationships at The Hellenic Initiative and Economic Club of Chicago.
Does Calamos Wealth Management participate in fund commitments or only direct deals?
The firm uses both routes. It commits to funds and executes direct co-investments and SPVs across private equity, venture, and credit.
What investment stages does Calamos Wealth Management typically target?
Activity centers on buyout, growth equity, and venture capital stages.
Where does the underlying wealth come from?
The platform originates from John P. Calamos Sr.'s success building Calamos Investments around convertible-securities strategies.
Does Calamos Wealth Management maintain philanthropic structures?
Yes. The John P. Calamos Foundation operates separately alongside board service at Leadership 100 and the Archons of the Ecumenical Patriarchate.
What is Calamos Wealth Management's known posture on co-investments alongside external GPs?
The firm pursues direct co-investments and SPVs in addition to fund commitments, leveraging parent relationships for access.
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.
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