Investment Strategy
The Heising-Simons Foundation was co-founded by Mark Heising and Elizabeth Simons and is headquartered in Los Altos, California. The foundation manages approximately $2 billion in total assets and distributes over $100 million annually in grants. Elizabeth Simons is the daughter of Jim Simons, the legendary mathematician and founder of Renaissance Technologies, one of the most successful quantitative hedge funds in history. Mark Heising is a managing director at Medley Partners, a quantitative investment firm.
The foundation’s grantmaking spans four primary areas: science (with an emphasis on fundamental physics, including funding for the Simons Observatory and other astrophysics research); education (focused on early childhood and K-12 STEM education); climate and clean energy (supporting clean energy policy, research, and deployment); and human rights (particularly immigration rights and gender equity).
The endowment is managed with the investment sophistication one would expect from a family with deep roots in quantitative finance. The portfolio is diversified across public equities, fixed income, private equity, venture capital, and other institutional asset classes. Mark Heising’s background in quantitative investing informs the foundation’s approach to portfolio construction, risk management, and manager selection.
The foundation’s investment objectives are to generate sufficient returns to sustain its grantmaking in perpetuity while preserving the real value of the endowment. Given the foundation’s annual disbursements of approximately $100 million or more, the portfolio must balance growth with liquidity management to ensure consistent funding for the foundation’s programmatic commitments.
Private Markets Approach
The Heising-Simons Foundation allocates a portion of its endowment to private equity and venture capital strategies. The private markets program is designed to enhance the portfolio’s long-term return potential while providing diversification benefits relative to the foundation’s public markets holdings.
The foundation’s private equity commitments span buyout, growth equity, and venture capital funds. Given the Heising and Simons families’ deep connections to the institutional investment community, including relationships cultivated through Renaissance Technologies, Medley Partners, and the broader Simons family’s philanthropic activities (including the Simons Foundation, founded by Jim and Marilyn Simons), the foundation has access to a wide network of institutional-quality fund managers.
The foundation has shown interest in investment strategies that align with its programmatic focus areas, particularly in clean energy and climate technology. As climate and clean energy represent one of the foundation’s four core grantmaking pillars, private markets investments in renewable energy infrastructure, energy storage, and decarbonization technology may complement the foundation’s broader strategy.
The foundation’s venture capital interests reflect its Silicon Valley location and the Heising-Simons family’s connections to the Bay Area technology ecosystem. The foundation has supported early-stage and growth-stage companies through both direct investments and fund commitments, with an orientation toward science-based and technology-driven enterprises.
Fund managers seeking commitments from the Heising-Simons Foundation should be prepared for a rigorous quantitative evaluation process. The family’s investment expertise means that the foundation’s team is sophisticated in evaluating track records, fee structures, risk-adjusted returns, and portfolio construction. Managers who can articulate clear, data-driven investment theses will be best positioned to engage with the foundation’s investment team.
Frequently Asked Questions
How large is the Heising-Simons Foundation?
The Heising-Simons Foundation manages approximately $2 billion in total assets. The foundation was co-founded by Mark Heising, a managing director at the quantitative investment firm Medley Partners, and Elizabeth Simons, the daughter of Jim Simons, the mathematician and founder of Renaissance Technologies. The foundation distributes approximately $100 million or more annually in grants across its focus areas of science, education, climate and clean energy, and human rights.
What does the Heising-Simons Foundation invest in?
The foundation maintains a diversified investment portfolio across public equities, fixed income, private equity, and venture capital. Given Mark Heising's background in quantitative investing and the Simons family's deep ties to the investment management industry, the foundation's portfolio reflects sophisticated institutional investment practices. The endowment is managed to generate returns sufficient to sustain the foundation's growing grantmaking commitments while preserving long-term purchasing power.
How can fund managers approach the Heising-Simons Foundation?
The Heising-Simons Foundation's investment team manages the endowment from Los Altos, California. The foundation does not issue public RFPs for investment allocations. Given the Heising and Simons families' extensive networks in the quantitative and institutional investment communities, introductions through existing relationships are the most common path to engagement. The foundation's IRS Form 990-PF filings provide publicly available information about investment holdings and can inform how prospective managers position their strategies.
