shares of exelon corp exc dropped 012 to 4134 tuesday on what proved to be an allaround positive trading session for the stock market with the sp 500 index spx rising 168 to 392056 and the dow jones industrial average djia rising 106 to 3215540 exelon corp closed 937 short of its 52week high 5071 which the company reached on april 21st the stock underperformed when compared to some of its competitors tuesday as nextera energy inc nee rose 172 to 7455 duke energy corp duk rose 098 to