The Dow Jones Industrial Average is soaring Tuesday afternoon with shares of Dow Inc. and American Express delivering strong returns for the index. The Dow /zigman2/quotes/210598065/realtime DJIA +3.15% is trading 727 points (3.2%) higher, as shares of Dow Inc. /zigman2/quotes/203121064/composite DOW +2.95% and American Express /zigman2/quotes/203805826/composite AXP +2.99% are contributing about one third of the index's intraday rally. Dow Inc.'s shares are up $4.35, or 14.2%, while those of American Express have risen $7.88, or 9.4%, combining for an approximately 84-point bump for the Dow. Goldman Sachs /zigman2/quotes/209237603/composite GS +1.44% , Caterpillar /zigman2/quotes/203434128/composite CAT +4.78% , and Exxon Mobil /zigman2/quotes/204455864/composite XOM +8.11% are also contributing significantly to the gain. A $1 move in any one of the 30 components of the benchmark results in a 6.86-point swing.