Phil Knight, the co-founder and chairman emeritus of Nike, has donated 12 million shares of Nike stock worth $990 million to an unnamed charity, according to a financial document that Nike has recently filed with the Securities and Exchange Commission. The regulatory filing notes that Phil Knight and his wife, Penelope, are directors of the charitable organization, but does not identify the beneficiary. Knight, who is 80 years old, and his wife have previously donated hundreds of millions of dollars to the University of Oregon and Stanford University.