A former high-ranking Enron Corp. trading and retail energy executive was sentenced to 2 1/2 years in prison Monday for insider trading in connection with the energy company’s financial collapse.

David Delainey, who pleaded guilty in October 2003, had admitted to participating in schemes to manipulate earnings to please Wall Street. Prosecutors said he sold $4.25 million in stock throughout 2001 when he knew of a wide-ranging scheme to make Enron appear financially robust and inflate the company’s stock.