Shares of Walgreens Boots and Chevron are trading lower Thursday afternoon, sending the Dow Jones Industrial Average into negative territory. Shares of Walgreens Boots WBA, -3.66% and Chevron CVX, -2.17% are contributing to the blue-chip gauge’s intraday decline, as the Dow DJIA, -0.54% was most recently trading 93 points lower (-0.3%). Walgreens Boots’s shares are off $1.57 (3.0%) while those of Chevron have dropped $1.89, or 2.0%, combining for an approximately 23-point drag on the Dow. 3M MMM, -1.55%, Goldman Sachs GS, -1.66%, and IBM IBM, -1.19% are also contributing significantly to the decline. A $1 move in any one of the 30 components of the index equates to a 6.58-point swing.