Persistently mild distribution in the broad market turned harsh Wednesday as major averages dropped sharply in higher volume. The selling also found its way into leading stocks in leading industry groups, putting the market uptrend back under pressure. The Nasdaq slumped 2.4%. It’s still above its 50-day moving average, but it was the tech index’s largest daily percentage decline since it lost 3.1% on April 10. The S&P 500 lost 1.5%.