In February 2015 Rex Energy announced it would sell its Keystone Clearwater Solutions subsidiary which provides water services for shale drillers in the Marcellus/Utica (see Rex Energy Looks to Sell 28,300 Marcellus Acres in Bid to Raise $). In June 2015 American Water Works, the country’s largest publicly traded water and wastewater utility company, announced it was buying Keystone from Rex for $130 million (see American Water Announces Agreement to Acquire Keystone Clearwater Solutions). Four years later, Keystone is being sold once again.