Medley Partners is a family office - single based in San Francisco, United States, founded in 2004. Verified contact details, AUM data, and investment preferences on FindLPs.
Founded in 2004 by Mark Heising, Medley Partners is the private markets investment manager for the foundations affiliated with Jim Simons' family: Simons Foundation, Heising-Simons Foundation, Just Society, and Sea Change Foundation. Medley invests primarily in limited partnerships across the private asset classes, including buyouts, growth equity, venture capital, real estate,e and credit in the United States, Europe, and Asia. We also participate in co-investment opportunities with our existing managers.
Investment types: Buyout, Growth/Expansion, Real Estate Opportunistic, Restructuring/Turnaround, Venture Capital
Sectors & themes: Charitable Investments, Fund Raising, Equity/Mutual Funds, Distressed Securities, Debt Issuance, Startups & Management, Hedge Funds, Commercial Property Acquisition & Development, Residential Property Acquisition & Development, High-Level Sectors, Non-Profit, Finance, Traditional Investments (Liquid Assets), Alternative Investments, Real Estate, Real Estate Investment & Development
Preferred geographies: United States, Europe, Americas, Latin America, Asia
Location: 50 California Street\nSan Francisco\nCalifornia\n94111\nUnited States
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LP firm data compiled from public regulatory filings (SEC Form ADV, FCA, AIFMD disclosures), company websites and press releases, LinkedIn public profiles, and verified outbound email testing. AUM figures reflect self-reported values from filings and may lag by 1–2 fiscal quarters; bands are normalized in USD. We do not publish personal residential information; firms or individuals may request removal at /contact. Methodology & sources · Updated July 2026.