Ownership Submission
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 OF SECURITIES

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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(Print or Type Responses)
1. Name and Address of Reporting Person *
ALTEP 2011 L.P.
  2. Issuer Name and Ticker or Trading Symbol
LyondellBasell Industries N.V. [LYB]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
Member of group with 10% owner
(Last)
(First)
(Middle)
730 FIFTH AVENUE
3. Date of Earliest Transaction (Month/Day/Year)
02/24/2012
(Street)

NEW YORK, NY 10019
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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
Class A Ordinary Shares 02/24/2012   S   23,027 D $ 44.0232 (1) 185,235 D (2)  
Class A Ordinary Shares               79,961,051 I By Corporation (3)
Class A Ordinary Shares               297,080 I By partnership (4)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 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
(Month/Day/Year)
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
ALTEP 2011 L.P.
730 FIFTH AVENUE
NEW YORK, NY 10019
      Member of group with 10% owner
AI INTERNATIONAL CHEMICALS S.A.R.L.
15-17 AVE. GASTON DIDERICH
LUXEMBOURG, N4 L-1420
    X    
AI INVESTMENTS HOLDINGS LLC
730 FIFTH AVENUE
NEW YORK, NY 10019
    X    
AI SMS L.P.
TRINITY CHAMBERS, ROAD TOWN
TORTOLA, D8 
    X    
AI SMS GP Ltd
TRINITY CHAMBERS, ROAD TOWN
TORTOLA, D8 
    X    
ACCESS INDUSTRIES, LLC
730 FIFTH AVENUE
NEW YORK, NY 10019
    X    
ACCESS INDUSTRIES MANAGEMENT, LLC
730 FIFTH AVENUE
NEW YORK, NY 10019
    X    
Blavatnik Len
730 FIFTH AVENUE
NEW YORK, NY 10019
    X    
ALTEP 2010 L.P.
730 FIFTH AVENUE
NEW YORK, NY 10019
      Member of group with 10% owner
ACCESS INDUSTRIES INC
730 FIFTH AVENUE
NEW YORK, NY 10019
      Affiliate of Member of a Group

Signatures

 /s/ Alejandro Moreno for AI International Chemicals S.A.R.L., AI Investments Holdings LLC, Access Industries, LLC, Access Industries Management, LLC, Altep 2010 L.P., Altep 2011 L.P. and Access Industries, Inc. and as Attorney-in-Fact for Mr. Blavatnik   02/28/2012
**Signature of Reporting Person Date

 /s/ Ronan J.E. Kuczaj for Belvaux Management Limited for AI SMS L.P. and AI SMS GP Limited   02/28/2012
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.02 to $44.04, inclusive. The reporting person undertakes to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.
(2) The securities reported are held directly by Altep 2011 L.P. ("Altep 2011") and may be deemed to be beneficially owned by Access Industries, Inc. and Mr. Blavatnik because Access Industries, Inc. is the general partner of Altep 2011 and Mr. Blavatnik controls Access Industries, Inc. Each of the reporting persons (other than Altep 2011) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.
(3) The securities reported are held directly by AI International Chemicals S.A.R.L. ("AIIC") and may be deemed to be held indirectly by each of the other reporting persons (other than Altep 2010 L.P., Altep 2011 L.P. and Access Industries, Inc.), because AIIC is a wholly owned subsidiary of AI Investments Holdings LLC, which is a wholly owned subsidiary of AI SMS L.P., a partnership of which AI SMS GP Limited is the general partner, which is a wholly owned subsidiary of Access Industries, LLC, which is controlled by Access Industries Management, LLC, which is controlled by Mr. Blavatnik. Each of the reporting persons (other than AIIC) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this Form.
(4) The securities reported are held directly by Altep 2010 L.P. ("Altep 2010") and may be deemed to be beneficially owned by Access Industries, Inc. and Mr. Blavatnik because Access Industries, Inc. is the general partner of Altep 2010 and Mr. Blavatnik controls Access Industries, Inc. Each of the reporting persons (other than Altep 2010) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

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