Shares of UnitedHealth and American Express are posting losses Friday afternoon, leading the Dow Jones Industrial Average slump. Shares of UnitedHealth /zigman2/quotes/210453738/composite UNH +0.07% and American Express /zigman2/quotes/203805826/composite AXP -3.13% have contributed to the index's intraday decline, as the Dow /zigman2/quotes/210598065/realtime DJIA -0.58% was most recently trading 535 points lower (-2.5%). UnitedHealth's shares are down $12.81, or 5.3%, while those of American Express are off $4.01, or 5.2%, combining for a roughly 114-point drag on the Dow. Also contributing significantly to the decline are Raytheon Technologies Corp. /zigman2/quotes/203237915/composite RTX +0.93% , JPMorgan Chase /zigman2/quotes/205971034/composite JPM -1.49% , and Travelers /zigman2/quotes/206313935/composite TRV +0.72% . A $1 move in any one of the 30 components of the Dow equates to a 6.78-point swing.