U.S. stock funds gained 1.15% in the week ended Feb. 12, according to Lipper Inc. It was their second straight weekly advance and the third in the past four weeks. The week’s return left U.S. diversified stock mutual funds ahead 1.64% for the young year. That gain easily outpaced the modest 0.05% showing by world equity funds. U.S. stocks rose in the latest week amid stock market news about a handful of strong quarterly earnings reports.