UPDATE 1-U.S.-based stock funds post $7.6 bln net outflows in week -Lipper

(Adds table, details, analyst quote) By Luciana Lopez NEW YORK, July 24 (Reuters) - Investors in U.S.-based funds withdrew a net $7.6 billion from stock funds in the week ended July 23, marking their biggest outflows since early February, data from Thomson Reuters' Lipper service showed on Thursday. While mutual fund investors added a net $379 million to such stock funds, exchange-traded funds posted outflows of $7.97 billion. ETFs are thought to represent the behavior of institution