All three major U.S. stock indexes turned lower in New York trading on the 27th as rising Treasury yields renewed pressure on equity valuations. Around 10 a.m., the Dow Jones Industrial Average fell 102.66 points from the previous close to 53,474.74, the Nasdaq Composite dropped 79.07 points to 26,072.33 and the S&P 500 slipped 7.08 points to 7,670.20. The Philadelphia Semiconductor Index, or SOX, declined 50.04 points to 11,538.00, recording the largest percentage loss among the major indexes. The Dow had gained 160.24 points in the previous session, but buying momentum faded and profit-taking emerged. Treasury yields rose across the curve, with the 10-year yield reaching 4.66% and weighing on stocks. The dollar also strengthened modestly, while crude oil futures extended their decline for a second day. Investors are watching U.S. economic data and Federal Reserve officials' remarks, with bond yields, monetary-policy expectations and dollar strength continuing to influence equities and commodities.