Shares of Apple Inc. and Boeing are trading lower Monday morning, sending the Dow Jones Industrial Average into negative territory. The Dow /zigman2/quotes/210598065/realtime DJIA +0.43% was most recently trading 74 points (0.3%) lower, as shares of Apple Inc. /zigman2/quotes/202934861/composite AAPL +2.82% and Boeing /zigman2/quotes/208579720/composite BA +2.27% have contributed to the blue-chip gauge's intraday decline. Apple Inc.'s shares are down $4.62, or 1.7%, while those of Boeing are down $4.05, or 1.1%, combining for a roughly 59-point drag on the Dow. Goldman Sachs /zigman2/quotes/209237603/composite GS -1.15% , Nike /zigman2/quotes/203439053/composite NKE -0.23% , and Walt Disney /zigman2/quotes/203410047/composite DIS -0.83% are also contributing significantly to the decline. A $1 move in any of the benchmark's 30 components equates to a 6.78-point swing.