shares of sp global inc spgi slid 048 to 33413 tuesday on what proved to be an allaround dismal trading session for the stock market with the sp 500 index spx falling 016 to 397127 and dow jones industrial average djia falling 012 to 3239425 the stocks fall snapped a twoday winning streak sp global inc closed 8942 short of its 52week high 42355 which the company achieved on march 31st the stock underperformed when compared to some of its competitors tuesday as moodys corp mco rose 028