Aldar, which is discussing a potential merger with Sorouh, soared 4.5 percent to 1.62 dirhams, the highest level since April 2011 at the close in Abu Dhabi. Sorouh jumped 3.2 percent to 1.6 dirhams, the highest since January 2011. The stocks were the second and third most traded by value on the benchmark ADX General Index. They helped the gauge rise 0.9 percent to 2,766.29, surpassing the threshold some investors consider as the beginning of a bull market after it advanced 20 percent since last year's low.