SemGroup : SemCAMS Receives Regulatory Approval for 200 mmcf per day Wapiti Gas Plant to Service Development of the Montney Formation

Calgary, AB - August 17, 2016 - SemCAMS, a subsidiary of SemGroup® Corporation (NYSE: SEMG), today announced that it has received Alberta Energy Regulator approval for its planned 200 mmcf per day sour gas plant (the "Wapiti Gas Plant"), which will provide much needed sour processing options to Montney producers in the Wapiti region of the Western Canadian Sedimentary Basin.

The proposed new gas plant, which will be located at 07-35-067-7W6M, has been designed to process up to 200 mmcf per day of raw sour gas and 20,000 barrels per day of condensate. With producer concerns over the long-term reliability of acid gas injection in the area, the Wapiti Gas Plant will be able to send the acid gas to SemCAMS' existing K3 and KA sour gas plants via existing infrastructure. This solution, which is unique to SemCAMS, provides a reliable long-term egress option for the acid gas, and has been well received by those actively drilling in the area. Negotiations are underway with multiple area producers to lock in long-term processing arrangements, and SemCAMS final investment decision of the project is expected upon execution of one or more of those agreements.

"The Wapiti area and this new gas plant are key components of our overall growth strategy and, with the engineering and licence approval now in hand, we are excited about moving this project to the next phase. SemCAMS has a long and successful history of safely operating sour gas plants, and we are looking forward to expanding that expertise in the Wapiti area and to Montney producers with this new facility," said David Gosse, SemCAMS' vice president and general manager.

For additional information, please contact Rob Nimmo, director of business development, at 403.536.3023.

SemCAMS U.L.C., a subsidiary of SemGroup® Corporation (NYSE: SEMG), is a gathering and processing business which provides midstream solutions for natural gas producers in Western Canada. SemCAMS is one of Alberta's largest licensed sour gas processors with facilities located near Whitecourt and Fox Creek. The company also operates two sweet gas processing facilities in this region. SemCAMS is based in Calgary, Alberta, Canada. For more information, visit www.semcams.com.

Based in Tulsa, Okla., SemGroup® Corporation (NYSE: SEMG) is a publicly traded midstream service company providing the energy industry the means to move products from the wellhead to the wholesale marketplace. SemGroup provides diversified services for end users and consumers

of crude oil, natural gas, natural gas liquids, refined products and asphalt. Services include purchasing, selling, processing, transporting, terminalling and storing energy.

Certain matters contained in this Press Release include "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. We make these forward-looking statements in reliance on the safe harbor protections provided under the Private Securities Litigation Reform Act of 1995.

All statements, other than statements of historical fact, included in this Press Release may constitute forward-looking statements. Although we believe that the expectations reflected in these forward-looking statements are reasonable, we cannot assure you that these expectations will prove to be correct. These forward-looking statements are subject to certain known and unknown risks and uncertainties, as well as assumptions that could cause actual results to differ materially from those reflected in these forward-looking statements. Factors that might cause actual results to differ include the risk factors discussed from time to time in each of our documents and reports filed with the SEC.

Readers are cautioned not to place undue reliance on any forward-looking statements contained in this Press Release, which reflect management's opinions only as of the date hereof. Except as required by law, we undertake no obligation to revise or publicly release the results of any revision to any forward-looking statements.

Investor Relations: Alisa Perkins

918-524-8081

investor.relations@semgroupcorp.com

Media:

Kiley Roberson 918-524-8594

kroberson@semgroupcorp.com