Exhibit 99.1.6

Joint Filing Agreement

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 (and any amendments thereto) with respect to the ordinary shares 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.

[Signature Page Follows]

IN WITNESS WHEREOF, the undersigned hereby execute this Joint Filing Agreement as of the 30^th day of December, 2014.

AI INTERNATIONAL CHEMICALS S.À R.L.
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Class A Manager
LEN BLAVATNIK
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Attorney-in-Fact
AI INVESTMENTS HOLDINGS LLC
By: Access Industries Management, LLC, its manager
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Executive Vice President
AI SMS L.P.
By: AI SMS GP Limited, its general partner By: Belvaux Management Limited, its director
By:	/s/ RONAN J.E. KUCZAJ
	Name:	Ronan J.E. Kuczaj
	Title:	Director
AI SMS GP LIMITED
By: Belvaux Management Limited, its director
By:	/s/ RONAN J.E. KUCZAJ
	Name:	Ronan J.E. Kuczaj
	Title:	Director
ACCESS INDUSTRIES HOLDINGS LLC
By: Access Industries Management, LLC, its manager
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Executive Vice President

ACCESS INDUSTRIES, LLC
By: Access Industries Management, LLC, its manager
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Executive Vice President
ACCESS INDUSTRIES MANAGEMENT, LLC
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Executive Vice President
ALTEP 2010 L.P.
By: Access Industries, Inc., its general partner
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Executive Vice President
ALTEP 2011 L.P.
By: Access Industries, Inc., its general partner
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Executive Vice President
ACCESS INDUSTRIES, INC.
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Executive Vice President
ACCESS INDUSTRIES INVESTMENT HOLDINGS LLC
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Manager

AI EUROPEAN HOLDINGS L.P.
By: AI European Holdings GP Limited, its general partner By: Hudson Administration S.A., its director
By:	/s/ DAWN E. SHAND
	Name:	Dawn E. Shand
	Title:	Director
AI EUROPEAN HOLDINGS GP LIMITED
By: Hudson Administration S.A., its director
By:	/s/ DAWN E. SHAND
	Name:	Dawn E. Shand
	Title:	Director
AI EUROPEAN HOLDINGS S.À R.L.
By: Access Industries Management, LLC, its Class A Manager
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Executive Vice President
By:	/s/ DAWN E. SHAND
	Name:	Dawn E. Shand
	Title:	Class B Manager
AI PETROLEUM HOLDINGS LLC
By: Access Industries Management, LLC, its manager
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Executive Vice President
AIPH HOLDINGS LLC
By: Access Industries Management, LLC, its manager
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Executive Vice President

ALTEP 2014 L.P.
By: Access Industries, Inc., its general partner
By:	/s/ ALEJANDRO MORENO
	Name:	Alejandro Moreno
	Title:	Executive Vice President