Disney shares surged 11 percent over the five trading days leading up to Feb. 13, amid signs of increases in the advertising market. Disney stock rose by $2.45 between Feb. 6 and Feb. 13, closing at $23.87 last Wednesday. It gained ground after rival programmers Viacom Inc. and News Corp. reported signs of an ad-market rebound in the early parts of the first quarter. Disney owns several cable channels and the ABC Television Network. Despite the rise in the stock, Disney shares were still down about 31 percent from their 52-week high of $34.80.