Behind declines for shares of Caterpillar and American Express, the Dow Jones Industrial Average is in selloff mode Friday afternoon. The Dow was most recently trading 359 points, or 1.1%, lower, as shares of Caterpillar and American Express are contributing to the index’s intraday decline. Caterpillar’s shares have declined $12.26, or 5.1%, while those of American Express are down $6.46, or 3.8%, combining for a roughly 123-point drag on the Dow. Goldman Sachs Salesforce and Walt Disney are also contributing significantly to the decline. A $1 move in any of the Dow’s 30 components equates to a 6.59-point swing.