Stanford University

Many colleges and universities in the United States maintain a financial endowment consisting of assets that are invested in financial securities, real estate, and other instruments. The investment yields a return that funds a portion of an institution's operational expenses while the principal exists in perpetuity. U.S. colleges and universities maintain some of the largest endowments in the world and make up the vast majority of higher education institutions with endowments greater than $1 billion. (from Wikipedia, CC BY-SA)