Shares of American Express and Salesforce are posting losses Friday morning, dragging the Dow Jones Industrial Average into negative territory. Shares of American Express
        AXP,
        
       and Salesforce
        CRM,
        
       have contributed to the index’s intraday decline, as the Dow
        DJIA,
        
       was most recently trading 168 points, or 0.5%, lower. American Express’s shares have dropped $5.64, or 3.8%, while those of Salesforce are down $4.95 (2.4%), combining for an approximately 70-point drag on the Dow. Other components contributing significantly to the decline include JPMorgan Chase
        JPM,
        
       Microsoft
        MSFT,
        
       and Caterpillar
        CAT,
        
       A $1 move in any of the Dow’s 30 components equates to a 6.59-point swing.
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