U.S. stocks snapped a four-day losing streak on Friday as a rebound in shares of beaten-down regional banks along with sharp gains in shares of Apple Inc. sent the main indexes sharply higher. However, Friday’s gains weren’t enough to wipe out weekly losses for the S&P 500 SPX and Dow DJIA, which saw their biggest weekly pullback since the week ended March 10, falling 0.8% and 1.2%, respectively, according to preliminary closing data from FactSet. The Nasdaq Composite COMP eked out a marginal weekly gain of 0.1%. For Friday’s session, the S&P 500 gained 75 points, or 1.9%, to finish at 4,136.25, according to preliminary…