X0202 3/A 2007-07-17 2007-07-17 0 0001392091 SemGroup Energy Partners, L.P. SGLP 0001406230 SemGroup Holdings, L.P. 6120 SOUTH YALE AVENUE SUITE 700 TULSA OK 74136 0 0 1 0 Subordinated units representing limited partner interests Common Units 12570504 D This Form 3 is being filed to amend a Form 3 previously filed on July 17, 2007 reporting for ownership of SemGroup Holdings, L.P. on July 17, 2007. The amount of subordinated units representing limited partner interests is amended to read 12,570,504. Each subordinated unit will convert into one common unit at the end of the subordination period, which will end if the Issuer has earned and paid at $1.25 on each outstanding common unit and general partner unit for any three consecutive, non-overlapping four-quarter periods ending on or after the date specified in the partnership agreement, but may end sooner if the Issuer meets additional financial tests as described in the partnership agreement. The subordinated units have no expiration date. /s/ Alex G. Stallings, Chief Accounting Officer of SemGroup Holdings, L.P. 2007-07-18