Sec Form 4 Filing - Hammond Gabriel Arce @ SemGroup Energy Partners, L.P. - 2009-03-20

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Hammond Gabriel Arce 2. Issuer Name and Ticker or Trading Symbol SemGroup Energy Partners, L.P. [ SGLP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner _____ Officer (give title below) X __ Other (specify below) Director of GP of Issuer (Last) (First) (Middle) 2100 MCKINNEY AVENUE, SUITE 1825 3. Date of Earliest Transaction (MM/DD/YY) 03/20/2009 (Street) DALLAS, TX75201 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price SGLP General Partner Units 03/20/2009 03/20/2009 S 92,096 ( 1 ) D 0 I Indirect SGLP Subordinated Units 03/20/2009 03/20/2009 S 1,676,067 ( 1 ) D 0 I Indirect

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Hammond Gabriel Arce 2100 MCKINNEY AVENUE SUITE 1825 DALLAS, TX75201 Director of GP of Issuer Signatures /s/ Gabriel Arce Hammond 03/23/2009 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On July 18, 2008, Alerian Finance Partners, LP ("Alerian") and another lender exercised certain rights under a Loan Agreement, dated June 25, 2008 (the "Holdings Credit Agreement"), with SemGroup Holdings, L.P., the sole member of SemGroup Energy Partners G.P., L.L.C. (the "General Partner"), which is the general partner of the issuer. Under the Holdings Credit Agreement, Alerian and the other lender had the right to direct the vote of all of the membership interests of the General Partner upon an event of default under the Holdings Credit Agreement. Alerian and the other lender exercised these voting rights on July 18, 2008. Pursuant to the terms of a Purchase and Sale Agreement by and among Alerian, the other lender, and the other parties thereto, dated March 20, 2009, Alerian has sold, among other things, these voting rights held by Alerian to the other lender. ( 2 )The purchase price is not determinable at this time.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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