• Antero Resources (NYSE:AR) -2.5% AH after agreeing to acquire 55K net acres and 14M cfe/day of net production in West Virginia's Marcellus Shale from Southwestern Energy (NYSE:SWN) for $450M.
• AR says substantially all the acreage will be dedicated to Antero Midstream Partners (NYSE:AM) for gas gathering, compression, processing and water services.
• To fund the deal, AR announces a public offering of 26.75M common shares, with an underwriters option to purchase up to an additional ~4M shares.
• SWN says it plans to use the cash from the deal to reduce the principal balance of its $750M term loan due in November 2018.

The acquisition includes undeveloped properties located primarily in Wetzel, Tyler and Doddridge Counties in West Virginia; per Yahoo