Shares of Dow Inc. and Boeing are trading lower Tuesday afternoon, dragging the Dow Jones Industrial Average into negative territory. Shares of Dow Inc. DOW, -4.31% and Boeing BA, -4.28% have contributed to the index’s intraday decline, as the Dow DJIA, -0.95% was most recently trading 174 points, or 0.5%, lower. Dow Inc.’s shares are down $2.88, or 4.5%, while those of Boeing are off $9.49 (3.8%), combining for an approximately 81-point drag on the Dow. Other components contributing significantly to the decline include Caterpillar CAT, -3.75%, American Express AXP, -2.92%, and Intel INTC, -3.17%. A $1 move in any of the index’s 30 components results in a 6.58-point swing.