S&P 1,900 possible in 12 months: JPMorgan's Lee

The upside on the S&P 500 Index in the next six to 12 months could be 1,800 or even 1,900, Thomas Lee, chief U.S. equity strategist at JPMorgan, told CNBC. A move to 1,900 would represent a 12 percent increase from current levels.