Brave Warrior is managed by Glenn Greenberg, who maintains a highly concentrated portfolio that he describes as a "defense against ignorance." He believes that the more companies you own, the less you will know about each, and the less you know about a business, the more likely you are to make mistakes due to fear and greed. He usually owns less than 10 stocks. Greenberg invests in companies with little competition, and places a great deal of emphasis on Return on Invested Capital.