The Permanent University Fund (PUF) is a sovereign wealth fund created by the State of Texas to fund public higher education within the state. A portion of the returns from the PUF are annually directed towards the Available University Fund (AUF), which distributes the funds according to provisions set forth by the 1876 Texas Constitution, subsequent constitutional amendments, and the board of regents of the University of Texas System and the Texas A&M University System. The PUF provides extra funds, above monies from tax revenues, to the UT System and the Texas A&M System which collectively have approximately 50 percent of state public university students.