Behind declines for shares of Dow Inc. and American Express, the Dow Jones Industrial Average is falling Tuesday afternoon. The Dow /zigman2/quotes/210598065/realtime DJIA -0.15% was most recently trading 152 points (0.6%) lower, as shares of Dow Inc. /zigman2/quotes/203121064/composite DOW -0.64% and American Express /zigman2/quotes/203805826/composite AXP -0.37% are contributing to the index's intraday decline. Dow Inc.'s shares have fallen $2.45, or 5.4%, while those of American Express have declined $2.83 (2.3%), combining for an approximately 36-point drag on the Dow. UnitedHealth /zigman2/quotes/210453738/composite UNH +2.28% , IBM /zigman2/quotes/203856914/composite IBM +1.04% , and Pfizer /zigman2/quotes/202877789/composite PFE -0.08% are also contributing significantly to the decline. A $1 move in any one of the 30 components of the index equates to a 6.78-point swing.