The primary objective of this book is to delve into how institutional and individual stock investors can evaluate portfolio performance through a typical assessment of the endowment fund of the University of Ibadan, Nigeria's premier university, as an institutional investor, over an evaluation period of five years, relative to a benchmark portfolio. This is in line with the modern portfolio theory of Harry Markowitz (1952), a Nobel Prize winner in 1990. The book begins with an introduction in chapter one. Chapter two is a synthesis of what constitutes the modern portfolio theory as well as of empirical evidence on the applications of the theory and the alternative theories subsequently developed. Chapter three reveals the techniques for evaluating portfolio performance while chapter four discusses about endowment funds in general. Chapter five presents the results of the application of the evaluation techniques. In conclusion, chapter six rounds up with the summary, recommendations and bibliography.