Headquartered in Houston, Texas, Summit Midstream Corporation (NYSE: SMC) is a value-driven corporation focused on developing, owning and operating midstream energy infrastructure assets that are strategically located in unconventional resource basins, primarily shale formations, in the continental United States. the Williston Basin in North Dakota, which includes the Bakken and Three Forks shale formations; the Denver-Julesburg Basin, which includes the Niobrara and Codell shale formations in Colorado and Wyoming; the Fort Worth Basin in Texas, which includes the Barnett Shale formation; and.