Joint Filing Agreement
Exhibit 99.1
The undersigned hereby agree that they are filing this statement jointly pursuant to Rule
13d-1(k)(1). Each of them is responsible for the timely filing of such Schedule 13D and any
amendments thereto, and for the completeness and accuracy of the information concerning such person
contained therein; but none of them is responsible for the completeness or accuracy of the
information concerning the other persons making the filing, unless such person knows or has reason
to believe that such information is inaccurate.
In accordance with Rule 13d-1(k)(1) promulgated under the Securities and Exchange Act of 1934,
as amended, the undersigned hereby agree to the joint filing with each other on behalf of each of
them of such a statement on Schedule 13D with respect to the common stock beneficially owned by
each of them, of LyondellBasell Industries N.V., a public limited liability company incorporated
under the laws of the Netherlands. This Joint Filing Agreement shall be included as an exhibit to
such Schedule 13D.
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IN WITNESS WHEREOF, the undersigned hereby execute this Joint Filing Agreement as of the 7th
day of January, 2011.
| AI INTERNATIONAL CHEMICALS S.À.X.X. |
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| By: | /s/ Xxxxxxxxx Xxxxxx | |||
| Xxxxxxxxx Xxxxxx, Class A Member | ||||
| XXXXXXX XXXXXXXXX |
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| /s/ Xxxxxxxxx Xxxxxx | ||||
| By: | Xxxxxxxxx Xxxxxx | |||
| Title: | Attorney-in-Fact | |||
| AI CHEMICAL HOLDINGS LLC By: Access Industries Management, LLC |
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| By: | /s/ Xxxxxxxxx Xxxxxx | |||
| Name: | Xxxxxxxxx Xxxxxx | |||
| Title: | Senior Vice President | |||
| AI SMS L.P. By: AI SMS GP LIMITED By: Belvaux Management Limited |
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| By: | /s/ Ronan X.X. Xxxxxx | |||
| Name: | Ronan X.X. Xxxxxx | |||
| Title: | Director | |||
| AI SMS GP LIMITED By: Belvaux Management Limited |
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| By: | /s/ Ronan X.X. Xxxxxx | |||
| Name: | Ronan X.X. Xxxxxx | |||
| Title: | Director | |||
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| ACCESS INDUSTRIES, LLC By: Access Industries Management, LLC |
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| By: | /s/ Xxxxxxxxx Xxxxxx | |||
| Name: | Xxxxxxxxx Xxxxxx | |||
| Title: | Senior Vice President | |||
| ACCESS INDUSTRIES MANAGEMENT, LLC |
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| By: | /s/ Xxxxxxxxx Xxxxxx | |||
| Name: | Xxxxxxxxx Xxxxxx | |||
| Title: | Senior Vice President | |||
| ALTEP 2010 L.P. By: Access Industries, Inc. |
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| By: | /s/ Xxxxxxxxx Xxxxxx | |||
| Name: | Xxxxxxxxx Xxxxxx | |||
| Title: | Senior Vice President | |||
| ACCESS INDUSTRIES, INC. |
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| By: | /s/ Xxxxxxxxx Xxxxxx | |||
| Name: | Xxxxxxxxx Xxxxxx | |||
| Title: | Senior Vice President | |||
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