In June 2011, XTO completed a merger with Pittsburgh-based Phillips Resources, Inc. and TWP Inc., which added a combined 317,000 acres of leasehold in the Marcellus Shale, bringing XTO's ownership to over 700,000 acres in the second largest gas field in the world. The largest gas field, according to XTO president Jack Williams, is in the North field offshore Qatar, and "ExxonMobil is playing a key role developing that resource also."<ref name= jw/>
==Ties to [[Interstate Oil and Gas Compact Commission]]==
XTO served as a sponsor for the [[Interstate Oil and Gas Compact Commission]]'s 2014 and 2015 annual meetings held in both Columbus, Ohio and Oklahoma City, Oklahoma.<ref>[http://www.desmogblog.com/sites/beta.desmogblog.com/files/IOGCC%20OKC%20Corporate%20Sponsors.pdf IOGCC 2014 "2015 Annual Conference: Oklahoma City, OK"], DeSmogBlog.com, accessed April 2016.</ref><ref>[https://www.documentcloud.org/documents/2798386-IOGCC-2014-Annual-Meeting-Sponsors.html IOGCC 2014 Annual Meeting Sponsors]</ref>