Fredette told The Salt Lake Tribune two weeks ago that he and his family had narrowed the list of potential agents to five. Tuesday's choice ends a significant competition among dozens of agents to represent the senior who averaged 28.9 points per game and helped BYU to its first Sweet 16 appearance since 1981.
The NBA draft is June 23 in Newark, N.J.
There's much debate around the basketball world regarding where Fredette will be selected. Most mock drafts have him going in the latter half of the first round.
Octagon also represents former BYU players Lee Cummard and Jonathan Tavernari. Cummard is playing in France and Tavernari in Italy.
The agency's NBA clients include former Utah Jazz player Wes Matthews (Portland), Golden's State's Stephen Curry, Atlanta's Kirk Hinrich, Memphis' Rudy Gay and New Orleans' Chris Paul and David West.
Octagon's website lists Austin as the senior vice president of basketball and Emens as its senior director.