Shares of United Technologies have climbed 4 percent since the company announced on Nov. 24 that Chief Financial Officer Greg Hayes replaced Louis Chenevert, who retired as chief executive officer, effective immediately. The stock performance eclipsed a slight decline in the S&P 500 index .SPX over that period, with investors saying Hayes could move to boost the stock, including taking a closer look at the structure of the company, which also makes Pratt & Whitney jet engines and Otis elevators.