Shares of American Express and Dow Inc. are trading lower Tuesday morning, leading the Dow Jones Industrial Average selloff. The Dow /zigman2/quotes/210598065/realtime DJIA -1.69% was most recently trading 295 points lower (-1.1%), as shares of American Express /zigman2/quotes/203805826/composite AXP -3.99% and Dow Inc. /zigman2/quotes/203121064/composite DOW -0.21% have contributed to the index's intraday decline. American Express's shares are off $3.69, or 2.9%, while those of Dow Inc. are off $1.24 (2.7%), combining for a roughly 33-point drag on the Dow. Other components contributing significantly to the decline include Cisco /zigman2/quotes/209509471/composite CSCO -1.86% , Walt Disney /zigman2/quotes/203410047/composite DIS -3.19% , and Visa /zigman2/quotes/203660239/composite V -3.52% . A $1 move in any one of the 30 components of the index equates to a 6.78-point swing.