Atlas Resource Partners LP (NYSE: ARP) opened a public offering of Class D cumulative redeemable perpetual preferred units, the company said Sept. 24.

Underwriters were given a monthlong option to purchase additional units, the company said.

Net proceeds will fund part of the acquisition of producing assets in the Eagle Ford Shale, Atlas Resource said.

Morgan Stanley & Co. LLC and UBS Securities LLC are joint book-running managers. Stifel, Nicolaus & Co. Inc. and Deutsche Bank Securities Inc. are joint lead managers. Janney Montgomery Scott LLC, MLV & Co. LLC and Sterne, Agee & Leach Inc. are co-managers, the company said.

Pittsburgh-based Atlas Resource Partners LP is an MLP that produces domestic oil and natural gas.