OVERVIEW

SemGroup Corporation is a Delaware corporation headquartered in Tulsa, Oklahoma that provides diversified services for end-users and consumers of crude oil, natural gas, natural gas liquids, refined products and asphalt.

The accompanying consolidated financial statements include the activities of SemGroup Corporation and its subsidiaries. The terms “we,” “our,” “us,” “the Company” and similar language used in these notes to consolidated financial statements refer to SemGroup Corporation and its subsidiaries.

At December 31, 2017, our reportable segments include the following:


•	Crude Transportation, which operates crude oil pipelines and truck transportation businesses in the United States. Crude Transportation’s assets include:


•	a crude oil gathering and transportation pipeline system in Kansas and northern Oklahoma that is connected to several third-party pipelines and refineries;


•	the Wattenberg Oil Trunkline ("WOT"), a crude oil gathering pipeline system that transports crude oil from production facilities in the DJ Basin to the pipeline owned by White Cliffs Pipeline, L.L.C. ("White Cliffs");


•	a crude oil trucking fleet of over 215 transport trucks and 210 trailers;


•	Maurepas Pipeline, consisting of three pipelines, with an approximate total of 106 miles, that service refineries in the Gulf Coast region (the “Maurepas Pipeline”); and


•	a 51% ownership interest in White Cliffs, which owns crude oil pipelines that transport crude oil from Platteville, Colorado to Cushing, Oklahoma (the "White Cliffs Pipeline").


•	Crude Facilities, which operates crude oil storage and terminal businesses in Cushing, Oklahoma and a crude oil truck unloading facility in Platteville, Colorado that connects to the origination point of the White Cliffs Pipeline.


•	Crude Supply and Logistics, which operates a crude oil marketing business utilizing our Crude Transportation and Crude Facilities assets for marketing purposes.


•	HFOTCO, acquired in July 2017, which operates a large terminal facility located on the U.S. Gulf Coast. HFOTCO’s assets include:


•	approximately 16.8 million barrels of product storage with crude pipeline connectivity to the local refining complex, deep water marine access and inbound crude receipt pipeline connectivity, as well as rail and truck loading and unloading capabilities; and


•	330 acres on the Houston Ship Channel.


•	SemGas, which provides natural gas gathering and processing services in the United States. SemGas operates gathering pipelines in Oklahoma and Texas and processing plants in northern Oklahoma and Texas.


•	SemCAMS, which provides natural gas gathering and processing services in Alberta, Canada. SemCAMS owns working interests in, and operates, a network of natural gas gathering and transportation pipelines and natural gas processing plants.

Additionally, we own an 11.78% interest in the general partner of NGL Energy Partners LP ("NGL Energy") (NYSE: NGL), certain refined products and crude oil storage assets in the United Kingdom ("U.K.") and certain liquid asphalt terminalling and modification facilities in Mexico, all of which are reported within Corporate and Other. See Note 6 for discussion of the disposal of Glass Mountain Pipeline ("Glass Mountain") on December 22, 2017. See Note 4 for discussion of held for sale status of the U.K. business and Mexican asphalt business.