shares of american electric power co inc aep slid 148 to 9128 tuesday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 116 to 411958 and dow jones industrial average djia falling 108 to 3368453 american electric power co inc closed 1432 short of its 52week high 10560 which the company achieved on september 12th