Shares of Amgen Inc. and Boeing are posting losses Friday morning, sending the Dow Jones Industrial Average into negative territory. The Dow DJIA, -0.48% was most recently trading 151 points, or 0.5%, lower, as shares of Amgen Inc. AMGN, -3.90% and Boeing BA, +0.13% have contributed to the index’s intraday decline. Amgen Inc.’s shares have declined $6.25 (2.5%) while those of Boeing have fallen $3.79, or 2.3%, combining for an approximately 66-point drag on the Dow. Also contributing significantly to the decline are Apple Inc. AAPL, -3.22%, Microsoft MSFT, -2.95%, and Walmart WMT, -1.80%. A $1 move in any one of the 30 components of the Dow results in a 6.58-point swing.