Imperial Holdings, a specialty finance company originating loans collateralized by life insurance policies, filed on Thursday with the SEC to raise up to $288 million in an initial public offering. The Boca Raton, FL-based company, which was founded in 2006 and booked $97 million in total revenue last year, plans to list on the NYSE under the symbol IFT. FBR Capital Markets is the lead underwriter on the deal, for which pricing terms and timing were not disclosed.