Shares of Boeing and UnitedHealth are seeing strong returns Thursday afternoon, though the Dow Jones Industrial Average is trading roughly flat. The Dow /zigman2/quotes/210598065/realtime DJIA +1.11% , most recently, was trading 4 points, or 0.0%, higher, as shares of Boeing /zigman2/quotes/208579720/composite BA -2.25% and UnitedHealth /zigman2/quotes/210453738/composite UNH +2.15% account for 18% of the index's intraday gains. Boeing's shares have climbed $5.56, or 1.6%, while those of UnitedHealth are up $2.00 (0.8%), combining for a roughly 51-point boost for the Dow. Other components contributing significantly to the gain include Home Depot /zigman2/quotes/208081807/composite HD +2.65% , Microsoft /zigman2/quotes/207732364/composite MSFT +2.99% , and American Express /zigman2/quotes/203805826/composite AXP -1.22% . A $1 move in any of the benchmark's 30 components results in a 6.78-point swing.