Mark T. Bertolini is an American businessman who is currently the CEO of Oscar Health, a tech-driven health insurance company located in New York. He was the co-CEO of Bridgewater Associates, one of the world's largest hedge funds, and was previously the CEO of Aetna, a Fortune 50 diversified health care benefits company with over $60 billion in 2015 revenue. Bertolini assumed the role of CEO on November 29, 2010 and of chairman on April 8, 2011, until Aetna was sold to CVS on November 28, 2018.

Bridgewater Associates, LP is an American investment management firm founded by Ray Dalio in 1975. The firm serves institutional clients including pension funds, endowments, foundations, foreign governments, and central banks. As of 2022, Bridgewater has posted the second highest gains of any hedge fund since its inception in 1975. The firm began as an institutional investment advisory service, graduated to institutional investing, and pioneered the risk parity investment approach in 1996.