Shares of American Express and United Technologies are retreating Wednesday morning, sending the Dow Jones Industrial Average into a slump. Shares of American Express /zigman2/quotes/203805826/composite AXP +3.09% and United Technologies are contributing to the blue-chip gauge's intraday decline, as the Dow /zigman2/quotes/210598065/realtime DJIA +0.96% was most recently trading 522 points, or 2.4%, lower. American Express's shares are off $5.22 (6.1%) while those of United Technologies are off $5.53 (5.9%), combining for an approximately 73-point drag on the Dow. Also contributing significantly to the decline are Boeing /zigman2/quotes/208579720/composite BA +3.41% , JPMorgan Chase /zigman2/quotes/205971034/composite JPM +4.68% , and Goldman Sachs /zigman2/quotes/209237603/composite GS +2.35% . A $1 move in any one of the 30 components of the index results in a 6.78-point swing.