D.B. Zwirn & Co., L.P. (DBZCO) is a privately owned hedge fund sponsor. The firm provides its services to pooled investment vehicles and corporations. It invests in the public equity and alternative investment markets of the United States. The firm also provides senior, senior stretch, and mezzanine loans to and structured equity investments across industries to create its hedging portfolios. It also specializes in refinancing and special situation transactions of companies engaged in the energy and power industry. The firm was formerly known as Highbridge Zwirn Capital Management LLC. D.B. Zwirn & Co. was founded in October 2001 and is based in New York, New York with additional offices in Houston, Texas and Stamford, Connecticut.