Watch Art Cashin: Last 10 mins. could be exciting

90 Seconds with Art Cashin: Taper in October?

Art Cashin says the last ten minutes of trading could be exciting as the S&P stock index is re-balanced and three new stocks are added to the Dow Jones industrial average.

Cashin, UBS' director of floor operations at the NYSE, told CNBC's Bob Pisani around midday that the upcoming German elections could also move the market on Monday.