Dragged down by losses for shares of UnitedHealth and American Express, the Dow Jones Industrial Average is slumping Friday afternoon. The Dow /zigman2/quotes/210598065/realtime DJIA -0.07% was most recently trading 481 points lower (-2.3%), as shares of UnitedHealth /zigman2/quotes/210453738/composite UNH +0.29% and American Express /zigman2/quotes/203805826/composite AXP -3.05% are contributing to the blue-chip gauge's intraday decline. UnitedHealth's shares are off $11.98 (5.0%) while those of American Express are off $3.48, or 4.5%, combining for an approximately 105-point drag on the Dow. Also contributing significantly to the decline are Walt Disney /zigman2/quotes/203410047/composite DIS +0.47% , IBM /zigman2/quotes/203856914/composite IBM +0.30% , and Visa /zigman2/quotes/203660239/composite V +0.50% . A $1 move in any of the benchmark's 30 components results in a 6.78-point swing.