Behind losses for shares of UnitedHealth and American Express, the Dow Jones Industrial Average is slumping Monday afternoon. Shares of UnitedHealth /zigman2/quotes/210453738/composite UNH +1.31% and American Express /zigman2/quotes/203805826/composite AXP -0.97% have contributed to the blue-chip gauge's intraday decline, as the Dow /zigman2/quotes/210598065/realtime DJIA +2.24% was most recently trading 862 points, or 3.0%, lower. UnitedHealth's shares have declined $20.25 (6.7%) while those of American Express have declined $6.38 (4.7%), combining for an approximately 181-point drag on the Dow. Other components contributing significantly to the decline include Cisco /zigman2/quotes/209509471/composite CSCO +4.82% , Visa /zigman2/quotes/203660239/composite V +2.80% , and Exxon Mobil /zigman2/quotes/204455864/composite XOM +7.65% . A $1 move in any of the Dow's 30 components results in a 6.78-point swing.