X0203 0000876661 NEW YORK STOCK EXCHANGE LLC 0001489136 SemGroup Corp 001-34736

6120 S. Yale AvenueSuite 1500 Tulsa OK OKLAHOMA 74136

(918) 524-8100 Class A Common stock, par value $0.01 per share 17 CFR 240.12d2-2(a)(3) Kristen Braley Analyst, Regulation 2019-12-05