US STOCKS-Wall St sells off on global slowdown concern; Disney slumps By: Reuters: Company News August 20, 2015 at 15:48 PM EDT * Indexes down: Dow 1.5 pct, S&P 1.5 pct, Nasdaq 2.2 pct (Updates prices, changes comment, byline) Read More >> Related Stocks: Apple NetApp Time Warner Walt Disney