Willett Advisors

Willett Advisors

Willett Advisors was established in 2010 to oversee the wealth generated by Bloomberg L.P. and its founder, Michael R. Bloomberg. Steven Rattner serves as Chairman and CEO, with Andrew Mulderry as Chief Investment Officer. The firm invests both personal holdings and assets directed through Bloomberg Philanthropies. The portfolio spans public equities, private equity buyouts and growth equity, real estate, hedge funds, and direct co-investments. Confirmed positions include Circle Internet Financial and a stake in White Star Petroleum. The firm also holds exposure to oil and gas assets through Geotech Oil Services and has participated alongside Sycamore Partners. Geographic coverage centers on North America with additional activity in Europe and Asia. Investment stages range from seed and Series A through Series G and into buyouts. Team size and office footprint remain undisclosed beyond the New York headquarters. Willett maintains memberships in the Council on Foreign Relations, Economic Club of New York, and Partnership for New York City. Michael Bloomberg is a signatory to The Giving Pledge. No operational events from the last 24 months appear in public records. The office functions as a dedicated vehicle for one principal's capital with direct oversight by Rattner, who previously co-founded Quadrangle Group. This creates a governance model that integrates investment execution with Bloomberg's broader philanthropic and policy interests without external LP reporting requirements.