By Dan Weil They have the largest combined weightings in the top 15 stocks by market value and held by Berkshire Hathaway. With Berkshire Hathaway’s (BRK.B) – Get Berkshire Hathaway Inc. Class B Report annual shareholders meeting coming up Saturday, Morningstar has put together its annual list of “funds that buy like [Warren] Buffett,” Berkshire’s chief executive. Morningstar, an investment research firm, looked at open-end mutual funds with at least $1 billion in assets and several other filters. The chosen funds have the largest combined weightings in the top 15 stocks, by market value, held…