Shares of Microsoft and Visa are trading lower Wednesday morning, sending the Dow Jones Industrial Average into negative territory. Shares of Microsoft /zigman2/quotes/207732364/composite MSFT +0.03% and Visa /zigman2/quotes/203660239/composite V +1.73% have contributed to the index's intraday decline, as the Dow /zigman2/quotes/210598065/realtime DJIA -0.36% was most recently trading 79 points (0.3%) lower. Microsoft's shares have dropped $1.92 (1.4%) while those of Visa are down $2.38 (1.3%), combining for an approximately 29-point drag on the Dow. Other components contributing significantly to the decline include UnitedHealth /zigman2/quotes/210453738/composite UNH +0.48% , IBM /zigman2/quotes/203856914/composite IBM +0.16% , and Verizon Communications Inc. /zigman2/quotes/204980236/composite VZ +0.10% . A $1 move in any of the index's 30 components results in a 6.78-point swing.