(MONEY Magazine) – Charlie Ober, the manager of this month's top-performing Money 50 fund, T. Rowe Price New Era, is upping his stake in overseas oil companies, arguing that despite the huge gains that energy stocks have already seen, the run isn't over yet. "I think our luck will be elongated." He says oil companies in Europe are better positioned than those in the U.S. to profit in the future. New Era is up 5.8% over the past month.

THE 10 BIGGEST FUNDS

How equity funds with the most assets fared

NOTES: Tickers represent largest share class. The 10 biggest funds are ranked by total net assets. [1] As of Sept. 15. [2] Annualized. [3] Closed to new investors. SOURCE: Lipper, New York; 877-955-4773.