By MarketWatch Automation
Shares of Chevron and Caterpillar are trading lower Friday afternoon, sending the Dow Jones Industrial Average into negative territory. Shares of Chevron /zigman2/quotes/205871374/composite CVX -0.74% and Caterpillar /zigman2/quotes/203434128/composite CAT -0.96% have contributed to the blue-chip gauge's intraday decline, as the Dow /zigman2/quotes/210598065/realtime DJIA -0.88% was most recently trading 171 points (0.7%) lower. Chevron's shares have dropped $3.41, or 4.0%, while those of Caterpillar are down $4.45, or 3.3%, combining for a roughly 54-point drag on the Dow. Also contributing significantly to the decline are Dow Inc. /zigman2/quotes/203121064/composite DOW -1.18% , Travelers /zigman2/quotes/206313935/composite TRV -0.88% , and American Express /zigman2/quotes/203805826/composite AXP -1.17% . A $1 move in any one of the 30 components of the index results in a 6.86-point swing.