Dragged down by declines for shares of UnitedHealth and American Express, the Dow Jones Industrial Average is in selloff mode Friday morning. The Dow /zigman2/quotes/210598065/realtime DJIA +3.15% was most recently trading 396 points (1.9%) lower, as shares of UnitedHealth /zigman2/quotes/210453738/composite UNH +4.62% and American Express /zigman2/quotes/203805826/composite AXP +2.99% are contributing to the blue-chip gauge's intraday decline. UnitedHealth's shares have declined $8.82, or 3.7%, while those of American Express are down $2.74, or 3.5%, combining for an approximately 78-point drag on the Dow. Other components contributing significantly to the decline include Walt Disney /zigman2/quotes/203410047/composite DIS +0.91% , Exxon Mobil /zigman2/quotes/204455864/composite XOM +8.11% , and IBM /zigman2/quotes/203856914/composite IBM +2.46% . A $1 move in any one of the 30 components of the benchmark results in a 6.78-point swing.