Guru invests in oil, fintech and a global investment firm. : Oakmark Fund manager Bill Nygren (Trades, Portfolio) disclosed his fourth-quarter portfolio earlier this week. To achieve long-term capital appreciation, the renowned guru, who also manages the Chicago-based firm's Select and Global Select funds, usually invests in mid- and large-cap companies. When picking stocks, he looks for growing companies that have shareholder-oriented management teams. According to the fund's fact sheet, he prefers to take a position when the stock is trading at a substantial discount to his estimate of intrinsic value, then waits for the gap between the two to close before selling.