Rex Energy Corporation announced that it has entered into a joint venture agreement with Summit Discovery Resources II, LLC, a wholly owned subsidiary of Sumitomo Corporation ("Sumitomo"), one of the largest trading and investment firms in Japan. Pursuant to the agreement, Rex Energy will sell and transfer interests in its Marcellus Shale assets located in the Commonwealth of Pennsylvania, including 12,900 net acres, certain producing Marcellus Shale wells and associated mid-stream assets, in a transaction valued at approximately $140.4 million. Under the transaction, Sumitomo will pay approximately $88.4 million in ...