PHILADELPHIA -(Dow Jones)- Cigna Corp. (CI), citing significant competitive and economic pressures, posted a sharp drop in third-quarter profit, trimmed its enrollment and earnings forecast for this year and projected further enrollment declines for 2009.

Cigna shares recently traded down 14.7%, or $2.91, to $16.94. The trough today of $16.90 represented the stock's lowest level in nearly five years. 52wk hi is 56.98.