JOINT FILING AGREEMENT
Exhibit 4
This JOINT FILING AGREEMENT, dated as of September 22, 2010, is made by and between Grupo
México, S.A.B. de C.V. (“Grupo México”) and Infraestructura y Transportes México, S.A. de C.V.
(“ITM”). Grupo México and ITM are collectively referred to herein as the “Parties” and each
individually as a “Party.” Pursuant to Rule 13d-1(k)(1)(iii) promulgated under the Securities
Exchange Act of 1934, as amended, the Parties hereby acknowledge and agree that Amendment No. 5 to
the Schedule 13D filed on or about this date (as further amended, the “Statement on Schedule 13D”)
is filed on behalf of each such Party and that all subsequent amendments to the Statement on
Schedule 13D shall be filed on behalf of each of the Parties without the necessity of executing or
filing additional joint filing agreements. The Parties hereby acknowledge that each Party shall be
responsible for timely filing of such amendments, and for the completeness and accuracy of the
information concerning such Party contained therein, but shall not be responsible for the
completeness and accuracy of the information concerning any other Party, except to the extent that
such Party knows or has reason to believe that such information is inaccurate.
IN WITNESS WHEREOF, the undersigned have executed this Joint Filing Agreement as of the day
and year first above written.
| GRUPO MÉXICO, S.A.B. DE C.V. |
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| By: | /s/ Xxxxxx Xxxxx Xxxxxxxxxxx | |||
| Name: | Xxxxxx Xxxxx Xxxxxxxxxxx | |||
| Title: | Chief Financial Officer | |||
| INFRAESTRUCTURA Y TRANSPORTES MÉXICO |
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| By: | /s/ Xxxxxx Xxxxx Xxxxxxxxxxx | |||
| Name: | Xxxxxx Xxxxx Xxxxxxxxxxx | |||
| Title: | Attorney-in-Fact | |||
