Dynegy Inc (DYN.N) shares closed below $5.50 on Thursday, marking the first time they finished below that mark since billionaire investor Carl Icahn offered to buy the power company at that price in December. Dynegy's shareholders rejected the $665 million buyout deal floated by Icahn last month. That $5.50-a-share bid came under fire from hedge fund Seneca Capital, Dynegy's second-largest shareholder, which believes the company has more value. Investors previously voted down a lower bid by private equity fund Blackstone Group LP (BX.N). After the failure of the second sale, Dynegy Chief Executive Bruce Williamson and Chief Financial Officer Holli Nichols said they would step down on March 11.
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