Athlon Energy, an exploration and production company focused on unconventional oil and liquids-rich natural gas reserves in Texas and New Mexico, filed on Wednesday with the SEC to raise up to $345 million in an initial public offering. The Fort Worth, TX-based company, which was founded in 2010 and booked $179 million in sales for the 12 months ended March 31, 2013, plans to list on the NYSE under the symbol ATHL. Athlon Energy filed confidentially on April 29, 2013. Citi is the sole bookrunner on the deal. No pricing terms were disclosed.