Gap ($GPS@US) reported fourth-quarter results on Thursday that missed top- and bottom-line estimates and announced a series of executive changes as the retailer continues to search for a permanent CEO. The retailer’s losses per share were 75 cents versus the 46 cents expected, and revenue was $4.24 billion versus $4.36 billion expected. The company reported net losses of $273 million, or 75 cents a share, for the three months that ended January 28th, compared with a loss of $16 million, or 4 cents per share, a year earlier. Gap shares dropped 7 percent in after-hours trading on Thursday.