The New York Stock Exchange (NYSE) has suspended trading of Atlas Resource Partners LP's (ARP) common and preferred units. NYSE informed the company last week that it would begin proceedings to delist the company's units. ARP is now listed on the over-the-counter market. Its common units were trading around 13 cents each on Thursday. The delisting is one part of the company's financial woes. It has delayed a payment on its borrowing base and exercised its 30-day grace period to pay interest on its senior notes. ARP's general partner, Atlas Energy Group LLC, was also delisted in March and is currently trading over-the-counter (see Shale Daily, March 21). ARP has producing wells and reserves in 17 states, which include assets in the Barnett, Eagle Ford, Marcellus and Utica shales.