BIRMINGHAM, Ala.–(BUSINESS WIRE)–Energen Corporation (NYSE: EGN) today announced that it has closed its previously announced upsized, underwritten public offering of 15,800,000 shares of its common stock and that the underwriter exercised in full its option to purchase an additional 2,370,000 shares, thereby bringing the total shares purchased to 18,170,000. Total net proceeds (including estimated expenses) were approximately $381.1 million. Credit Suisse Securities (USA) LLC acted as sole bo