September 29, 2005

CEMEX, S.A. de C.V. (NYSE: CX) announced today that the underwriters of its previously announced non-dilutive equity offering have exercised their over-allotment option in full to purchase an additional 3,993,340 ADSs in the form of both ADSs and CPOs, comprised of 2,956,757 ADSs and 10,365,830 CPOs (each ADS represents ten CPOs), from the Mexican trust created to sell the ADSs and CPOs in the offering. Including the exercise of the over-allotment option, a total of 30,993,340 ADSs are being offered in the form of both ADSs and CPOs, comprised of 22,943,340 ADSs and 80,500,000 CPOs.

The additional ADSs and CPOs will be sold at the same public offering prices of US$49.50 per ADS and MXP53.89 per CPO as the initial offering.

The aggregate proceeds of the offering, including proceeds from the exercise of the over-allotment option, are expected to be approximately US$1.5 billion, after underwriting discounts and commissions. Approximately US$1.3 billion of these proceeds are expected to be used to unwind several forward contracts entered into between certain subsidiaries of CEMEX and certain banks, with the remaining amount, before expenses of the offering, to be paid to CEMEX.

This transaction will not increase the number of shares outstanding and thus will not dilute existing shareholders.

A shelf Registration Statement relating to these securities has been filed with the Securities and Exchange Commission and is effective. This announcement shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state.

The offering is made solely by prospectus. Copies of the prospectus supplement and prospectus may be obtained from the Prospectus departments of Citigroup Global Markets Inc. or J.P. Morgan Securities Inc. at the following addresses:

CEMEX is a growing global building solutions company that provides products of consistently high quality and reliable service to customers and communities in more than 50 countries throughout the world. The company improves the well-being of those it serves through its relentless focus on continuous improvement and efforts to promote a sustainable future. For more information, visit www.cemex.com.

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This press release contains forward looking statements and information that are necessarily subject to risks, uncertainties and assumptions. In addition, many factors could cause the actual results, performance or achievements of CEMEX to be materially different from those expressed or implied in this release, including, among others, changes in general economic, political, governmental and business conditions globally and in the countries in which CEMEX does business, changes in interest rates, changes in inflation rates, changes in exchange rates, the level of construction generally, changes in cement demand and prices, changes in raw material and energy prices, changes in business strategy and various other factors. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those described herein. CEMEX assumes no obligation to update or correct the information contained in this press release.

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