Deerfield Management is a prominent American investment firm specializing in the healthcare and biotechnology sectors. Established in 1994 by Arnold Snider with an initial equity of $17 million, the firm has grown to become one of the largest dedicated healthcare investment firms globally. Headquartered in New York City, Deerfield focuses on public and private investments, including hedge funds, venture capital, private equity, and private credit.

The firm's assets under management were reported at $15 billion as of March 2023, with a team of approximately 175 employees. Notable milestones include the acquisition of 345 Park Avenue South in May 2019, which now serves as its headquarters. Over the years, Deerfield has been involved in several significant transactions, such as acquiring IMRIS in 2015 and Adeptus Health in 2017, both following their respective Chapter 11 bankruptcy filings.

In 2019, Deerfield partnered with Harvard University, committing $100 million to fund drug and medical treatment development through a new entity, Lab1636. The firm's investment philosophy emphasizes strategic partnerships and active involvement in the healthcare sector to drive innovation and growth.