X0303 5 2008-12-31 0 0 1 0001392091 SemGroup Energy Partners, L.P. SGLP 0001405945 Schwiering Peter L 6120 SOUTH YALE AVENUE SUITE 500 TULSA OK 74136 0 0 0 1 EVP of GP of Issuer Common units representing limited partner interests 2008-08-13 4 F 0 L 14378 10.70 D 70622 D As disclosed in a current report on Form 8-K filed on July 21, 2008, the phantom units vested on a change of control of the general partner, SemGroup Energy Partners G.P., L.L.C. (the "General Partner"), of SemGroup Energy Partners, L.P. (the "Partnership"). The vested units were issued on August 13, 2008; 14,378 units were withheld to fulfill tax obligations as permitted by the Long-Term Incentive Plan of the General Partner. Mr. Schwiering is an Executive Vice President of SemGroup Energy Partners G.P., L.L.C., the general partner of SemGroup Energy Partners, L.P. /s/ Peter L. Schwiering 2009-02-12