U.S. diversified stock funds ended a four-week winning streak by losing 2.06% on average in the latest week, which ended April 30. The loss cut the funds’ gain for the year to 2.22%. It was their worst weekly setback since their 3.13% tumble in the week that ended Jan. 15. Mixed earnings news and economic data sparked a sell-off among small-company shares. The government reported first-quarter GDP of 0.2%, down from 2.2% in Q4.