Shares of Nike and Salesforce.com Inc. are seeing declines Wednesday afternoon, sending the Dow Jones Industrial Average into negative territory. The Dow was most recently trading 185 points, or 0.5%, lower, as shares of Nike and Salesforce.com Inc. have contributed to the index’s intraday decline. Nike’s shares are down $5.88, or 3.4%, while those of Salesforce.com Inc. are down $8.77, or 2.8%, combining for an approximately 97-point drag on the Dow. Chevron Microsoft and Apple Inc. are also contributing significantly to the decline. A $1 move in any one of the 30 components of the benchmark equates to a 6.59-point swing.