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Medley Partners
Medley Partners was established in 2004 by Mark Heising, son-in-law of Jim Simons. The firm manages the private-market allocation for Simons family wealth and...
Medley Partners
Medley Partners was established in 2004 by Mark Heising, son-in-law of Jim Simons. The firm manages the private-market allocation for Simons family wealth and four named foundations. Simons built his fortune through Renaissance Technologies; Heising directs the deployment of that capital into alternatives. The portfolio spans private equity funds in buyouts, growth equity and venture capital, plus real estate, private debt and distressed opportunities. Confirmed positions include limited partnership interests in global funds and co-investments alongside The Swig Company in San Francisco properties such as 901 Battery Street. Geographic coverage centers on North America, Europe and Asia. Investment stages run from seed through late-stage venture and buyouts. The team size is not publicly stated. Additional vehicles tied to the same family include the Simons Foundation, Heising-Simons Foundation, Sea Change Foundation and Foundation for a Just Society. Mark Heising and Liz Simons joined the Giving Pledge in 2016. No operational events from the last 24 months appear in available records. Medley Partners maintains a pure fund-of-funds mandate with limited direct holdings, separating foundation governance from investment execution. This architecture allows each philanthropic entity to retain independent oversight while sharing a single alternatives platform.
General information
Firm type
Single Family Office
Year founded
2004
AUM
6770 (Altss estimate)
Location
Region
North America
Country
United States
City
San Francisco
Corporate office
San Francisco, CA, United States
Principals
Mark Heising
Founder
Sector focus
Frequently asked questions
Who runs investment decisions at Medley Partners?
Mark Heising founded the firm and directs its investment activity. He also serves on boards including the Environmental Defense Fund and Institute for Advanced Study.
How does Medley Partners source proprietary deal flow?
The firm commits to established private equity, venture and real estate managers and participates in selective co-investments with partners such as The Swig Company.
Is Medley Partners structured as a single family office or does it operate more like a venture firm?
It operates as a single family office that functions internally as a fund-of-funds manager with direct co-investment capability.
Does Medley Partners participate in fund commitments or only direct deals?
The primary activity is commitments to private equity, venture, real estate and distressed funds, supplemented by direct co-investments and real-asset holdings.
What investment stages does Medley Partners typically target?
Stages range from seed and early-stage venture through growth, late-stage, buyout and distressed situations.
Where does the underlying wealth come from?
The capital originates from Jim Simons, founder of Renaissance Technologies, and is deployed on behalf of his family and four named foundations.
Does Medley Partners maintain philanthropic structures, and how are they separated?
Four foundations—the Simons Foundation, Heising-Simons Foundation, Sea Change Foundation and Foundation for a Just Society—each retain separate governance while sharing the Medley investment platform.
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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