Shares of Walgreens Boots and Salesforce Inc. are trading lower Thursday afternoon, dragging the Dow Jones Industrial Average into negative territory. Shares of Walgreens Boots WBA, -0.22% and Salesforce Inc. CRM, 0.37% are contributing to the index’s intraday decline, as the Dow DJIA, -0.22% was most recently trading 233 points lower (-0.7%). Walgreens Boots’s shares have declined $2.58, or 6.3%, while those of Salesforce Inc. are down $5.70 (3.3%), combining for an approximately 55-point drag on the Dow. Caterpillar CAT, -1.02%, JPMorgan Chase JPM, -0.03%, and Goldman Sachs GS, -0.35% are also contributing significantly to the decline. A $1 move in any one of the 30 components of the Dow equates to a 6.59-point swing.