Medley Partners

Medley Partners is a private equity firm established in 2004 and headquartered in San Francisco, California. The firm focuses on managing private equity investments on behalf of Jim Simons' family and affiliated entities. Medley Partners invests primarily in limited partnerships across various private asset classes, including buyout, growth equity, venture capital, real estate, and credit, with a geographical focus on the United States, Europe, and Asia. The firm employs a diverse investment strategy, actively seeking opportunities that demonstrate strong management and compelling long-term value fundamentals. Additionally, Medley Partners engages in co-investment opportunities alongside the funds in which it invests, enhancing its overall investment approach.

Mark Heising

Founder and Managing Director

7 past transactions

Siva Power

Series E in 2017
Siva Power develops third-generation thin-film PV technologies which increase solar cell efficiency and reduce manufacturing costs, therefore enabling the commercialization of solar modules that generate electricity at competitive rates without depending on government subsidies. Siva Power was founded in 2006 and headquartered in San Jose, California.

Siva Power

Series D in 2015
Siva Power develops third-generation thin-film PV technologies which increase solar cell efficiency and reduce manufacturing costs, therefore enabling the commercialization of solar modules that generate electricity at competitive rates without depending on government subsidies. Siva Power was founded in 2006 and headquartered in San Jose, California.

Siva Power

Series C in 2011
Siva Power develops third-generation thin-film PV technologies which increase solar cell efficiency and reduce manufacturing costs, therefore enabling the commercialization of solar modules that generate electricity at competitive rates without depending on government subsidies. Siva Power was founded in 2006 and headquartered in San Jose, California.

Siva Power

Series C in 2010
Siva Power develops third-generation thin-film PV technologies which increase solar cell efficiency and reduce manufacturing costs, therefore enabling the commercialization of solar modules that generate electricity at competitive rates without depending on government subsidies. Siva Power was founded in 2006 and headquartered in San Jose, California.

Siva Power

Series B in 2008
Siva Power develops third-generation thin-film PV technologies which increase solar cell efficiency and reduce manufacturing costs, therefore enabling the commercialization of solar modules that generate electricity at competitive rates without depending on government subsidies. Siva Power was founded in 2006 and headquartered in San Jose, California.

EnLink Geoenergy Services

Venture Round in 2008
EnLink continues to be an innovative leader in the geothermal heat pump (GHP) industry by virtue of its continuous improvement in the installation of underground loop systems, called Earth Heat Exchangers (EHXs). After 14 years in the business, and with 13 US and international patents to its credit, EnLink has a record of reliability and success in EHX installation that is unsurpassed in the industry. EnLink is committed to total professionalism with its clients, its partners and all the stakeholders who participate in their projects.

Siva Power

Series A in 2007
Siva Power develops third-generation thin-film PV technologies which increase solar cell efficiency and reduce manufacturing costs, therefore enabling the commercialization of solar modules that generate electricity at competitive rates without depending on government subsidies. Siva Power was founded in 2006 and headquartered in San Jose, California.
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