Shares of Amgen Inc. and Verizon Communications Inc. are trading lower Tuesday afternoon, dragging the Dow Jones Industrial Average into negative territory. The Dow DJIA, -0.06% was most recently trading 49 points lower (-0.1%), as shares of Amgen Inc. AMGN, -1.91% and Verizon Communications Inc. VZ, -1.62% have contributed to the blue-chip gauge’s intraday decline. Amgen Inc.’s shares are off $4.10, or 2.0%, while those of Verizon Communications Inc. have dropped $0.92, or 1.8%, combining for an approximately 33-point drag on the Dow. Other components contributing significantly to the decline include Johnson & Johnson JNJ, -1.31%, Intel INTC, -1.67%, and IBM IBM, -1.19%. A $1 move in any of the index’s 30 components equates to a 6.58-point swing.