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Mitchell Darrin Fenster
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Mitchell Darrin Fenster

Chief Financial Officer & Associate Compliance Officer

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At a glance

Full Name
Mitchell Fenster
Title
Chief Financial Officer; Associate Compliance Officer
Firm
57 Stars LLC
Firm Type
Independent global alternative asset manager / venture capital and private equity principal
Investment Stage
Private equity and venture capital fund partnerships, co-investments, secondary acquisitions, growth capital, venture capital, structured transactions, and special purpose vehicles
Target Company Profile
High-growth businesses and fund exposures in sectors benefiting from secular tailwinds, disruptive forces, technological innovation, adoption, and adaptation
Sector Focus
Health & care-related technologies, consumer and enterprise tech-enablement, fintech and financial services, environmental sustainability, impact themes including healthcare, financial inclusion, and environmental sustainability
Geographic Focus
Select markets outside the United States and Western Europe, including emerging markets; firm presence in Washington, DC/Arlington, San Diego, Munich, Singapore, Tokyo, and Beijing
Location
Washington, DC area; 57 Stars lists its Washington office at 1655 Fort Myer Dr., Suite 920, Arlington, VA 22209

Background

Mitchell Fenster joined 57 Stars in 2010 and serves as Chief Financial Officer. The firm says he is responsible for the financial and operational aspects of 57 Stars, including treasury management for its funds and quarterly investor reporting. He also serves as Associate Compliance Officer.

Before 57 Stars, Fenster was Vice President of Finance and Operations for The Global Fund for Children, an international nonprofit focused on vulnerable children in emerging markets. In that role, he was responsible for accounting, finance, human resources, and internal operations.

Earlier in his career, Fenster was Chief Financial Officer of Phyto-Riker Pharmaceuticals, a Ghana-based manufacturer and distributor of essential medicines. He also worked as an investment officer for Modern Africa Fund Managers, a private equity firm focused on sub-Saharan Africa, and held roles with OPIC, the Inter-American Development Bank, and KPMG Barents Group in Mongolia.

Fenster holds a BSBA in Accounting and Finance from Washington University in St. Louis and an MBA from Georgetown University. 57 Stars notes that he has worked internationally, including in Ghana, Mongolia, and Russia.

Investment Thesis & Focus

  • 57 Stars states that it invests through “private equity and venture capital fund partnerships, co-investments and secondary acquisitions” in high-growth sectors driven by secular tailwinds, disruptive forces, and technology adoption.
  • The firm uses a thematic approach, identifying macro-level trends and sourcing investments expected to benefit from those trends in key economic sectors.
  • Its strategy includes growth capital, venture capital, co-investments, secondaries, and special purpose vehicles.
  • Current focus sectors include health & care-related technologies, consumer and enterprise tech-enablement, fintech and financial services, and environmental sustainability.
  • For impact investing, 57 Stars seeks co-investments with GPs in high-growth businesses where financial drivers and impact drivers are positively correlated, especially healthcare, financial inclusion, and environmental sustainability in emerging markets.
  • Fenster is not presented publicly as a front-line deal lead; his role is finance, operations, treasury, investor reporting, and compliance.

Notable Investments

  • Natural World Products: 57 Stars invested in the Belfast-headquartered organic waste processor in 2021 alongside MML Ireland; 57 Stars said its exit from NWP was selected for Private Equity/Venture Capital Deal of the Year for CY 2025 at the Northern Ireland Dealmakers Awards on March 19, 2026.
  • Kingsbridge Healthcare Group: 57 Stars reported that its exit from Kingsbridge Healthcare Group was recognized with the same Northern Ireland deal award the prior year.
  • Broader portfolio: 57 Stars reports investment history across more than 150 funds, 50 co-investments, and 10 secondaries, with more than 2,000 underlying portfolio companies, but it does not publish a complete company list on its website.

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