All three of the major indexes (^DJI, ^IXIC, ^GSPC) closed Wednesday's session with colossal gains β€” the Dow Jones Industrial Average skyrocketed by over 1,320 points (2.85%) and the Nasdaq Composite surged by nearly 620 points (2.8%) β€” after President Trump announced that Iran agreed to a two-week ceasefire last night. Yahoo Finance Markets and Data Editor Jared Blikre takes a closer look at the trading day's biggest sector gainers.