Nathaniel Simons (born 1966) is an American billionaire hedge fund manager and philanthropist.

[1][2] He is the founder of Meritage Group, an investment management firm managing over $12 billion in assets, co-founder of Prelude Ventures, a clean tech investment fund, and is the former co-chair of Renaissance Technologies, one of the largest hedge funds in the world.

[4][5][6] The son of James Simons, a mathematician and the founder of Renaissance Technologies,[7] and Barbara Simons née Bluestein, a computer scientist and former president of the Association for Computing Machinery (ACM),[8] he attended the University of California, Berkeley.

[14] In 2015, Simons and his wife, Laura Baxter-Simons, joined the Breakthrough Energy Coalition.

[12][19] In 2009, Simons spoke along with Bill Clinton and Al Gore at the National Clean Energy Project roundtable.

Baxter-Simons serves as the general counsel and chief compliance officer at Meritage Group.