Who’s king of the hill in the stock market today among U.S. stock mutual funds? The peak for 2014 was held by $825 million Glenmede Large Cap Growth , with a 20.99% gain this year through Dec. 23, among U.S. stock mutual funds with at least $500 million in assets, according to Morningstar Inc. Close behind was $7.3 billion Vanguard Primecap Core .