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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             -----------------------

                                    FORM 6-K

       REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 or 15d-16
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                             -----------------------

                       Date of Report: September 14, 2005

                               CEMEX, S.A. de C.V.
                               -------------------
             (Exact name of Registrant as specified in its charter)

                                   CEMEX Corp.
                                   -----------
                 (Translation of Registrant's name into English)

                              United Mexican States
                              ---------------------
                 (Jurisdiction of incorporation or organization)

          Av. Ricardo Margain Zozaya #325, Colonia Valle del Campestre
                     Garza Garcia, Nuevo Leon, Mexico 66265
          ------------------------------------------------------------
                    (Address of principal executive offices)


Indicate by check mark whether the registrant files or will file annual reports
under cover Form 20-F or Form 40-F.

Form 20-F   X      Form 40-F
          -----              -----

Indicate by check mark whether the registrant by furnishing the information
contained in this Form is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes                No    X
    -----              -----

If "Yes" is marked, indicate below the file number assigned to the registrant in
connection with Rule 12g3-2(b):

N/A
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                                    Contents

     1.   Press release issued by CEMEX, S.A. de C.V. ("CEMEX"), dated September
          12, 2005, announcing that it intends to commence a non-dilutive equity
          offering (attached hereto as exhibit 1).

     2.   Press release  issued by CEMEX,  dated  September 12, 2005,  providing
          guidance with respect to its projected  earnings for the third quarter
          of 2005 (attached hereto as exhibit 2).



                                    SIGNATURE


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
CEMEX,  S.A.  de C.V.  has duly caused this report to be signed on its behalf by
the undersigned, thereunto duly authorized.




                                                       CEMEX, S.A. de C.V.
                                                   -----------------------------
                                                       (Registrant)



Date:    September 13, 2005                        By: /s/ Rafael Garza
      --------------------------------------           -------------------------
                                                       Name:  Rafael Garza
                                                       Title: Chief Comptroller



                                  EXHIBIT INDEX


EXHIBIT NO.       DESCRIPTION
-----------       -----------
1                 Press release issued by CEMEX, S.A. de C.V.  ("CEMEX"),  dated
                  September 12, 2005,  announcing  that it intends to commence a
                  non-dilutive equity offering.

2                 Press  release  issued by CEMEX,  dated  September  12,  2005,
                  providing  guidance with respect to its projected earnings for
                  the third quarter of 2005.







                                                                       EXHIBIT 1


  Media Relations             Investor Relations             Analyst Relations
   Jorge Perez                Abraham Rodriguez                Ricardo Sales
 (52 81) 8888-4334            (52 81) 8888-4262                (212) 317-6008


                            [CEMEX GRAPHIC OMITTED]


                          CEMEX ANNOUNCES NON-DILUTIVE
                                 EQUITY OFFERING

MONTERREY, MEXICO, September 12, 2005 - CEMEX, S.A. de C.V. (NYSE: CX) announced
today that it  intends,  subject to market and other  conditions,  to commence a
global public  offering of 27 million of its American  Depositary  Shares (ADSs)
plus up to an additional 3.99 million ADSs to cover  over-allotments,  through a
Mexican trust created to sell the ADSs in the offering.  This  transaction  will
not increase the number of shares  outstanding and thus will not dilute existing
shareholders. Citigroup Global Markets Inc. and J.P. Morgan Securities Inc. will
act as joint bookrunning managers for the offering.

The ADSs are being offered in connection  with the unwinding of several  forward
contracts entered into between certain banks and CEMEX. The proceeds of the sale
of the ADSs being offered will be applied  against amounts CEMEX is obligated to
pay under the  forward  contracts  in respect of the ADSs sold,  with  remaining
amounts payable to CEMEX.

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,  when available, may be obtained from the Prospectus departments
of Citigroup Global Markets Inc. or J.P. Morgan Securities Inc. at the following
addresses:

      Citigroup Global Markets Inc.             J.P. Morgan Securities Inc.
         Brooklyn Army Terminal                  One Chase Manhattan Plaza
             140 58th Street                              Floor 5B
           Brooklyn, NY 11220                        New York, NY 10081
           Tel: (718) 765-6732                      Tel: (212) 552-5164
           Fax: (718) 765-6734                      Fax: (212) 552-5319


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.


This press release contains forward-looking  statements and information that are
necessarily  subject to risks,  uncertainties and assumptions.  The proposed ADS
offering is dependent upon market  conditions,  which are subject to change.  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.



                                                                       EXHIBIT 2


  Media Relations             Investor Relations             Analyst Relations
   Jorge Perez                Abraham Rodriguez                Ricardo Sales
 (52 81) 8888-4334            (52 81) 8888-4262                (212) 317-6008


                            [CEMEX GRAPHIC OMITTED]


                           CEMEX PROVIDES GUIDANCE FOR
                            THE THIRD QUARTER OF 2005

MONTERREY, MEXICO, September 12, 2005 - CEMEX, S.A. de C.V. (NYSE: CX) announced
today that it expects EBITDA for the quarter ending  September 30, 2005 of close
to US$1.0  billion,  an  increase of about 50% versus the year  earlier  period,
while operating income is expected at about US$750 million,  52% higher than the
same period a year ago. For the third  quarter,  CEMEX expects  revenue of about
US$4.4 billion,  an increase of 115% versus the same period a year ago.  Revenue
and EBITDA are expected to be in line with those of second quarter 2005. For the
first nine months of the year, CEMEX expects EBITDA in excess of US$2.6 billion,
while revenue is expected at about US$11.4  billion,  increases of about 39% and
94%  respectively.  These results  include the effect of  consolidating  the RMC
group starting March 1st 2005.

The  mark-to-market  of our derivatives  position has improved by US$281 million
since June 30, 2005,  from a positive  US$149 million to positive US$430 million
as of  September  9, 2005.  More than 95% percent of the  improvement  will flow
through our income statement during the third quarter.

Rodrigo  Trevino,  Chief  Financial  Officer,  said:  "Our  strong  year to date
performance puts us on track to achieve our stated full-year EBITDA guidance and
to increase our  estimates  for free cash flow,  which is now expected at US$1.9
billion  in  2005.  As  a  result  of  our  solid   operating   performance  and
de-leveraging efforts since the RMC acquisition, we expect to achieve a leverage
ratio of net debt to  EBITDA  of 2.7  times or  better  by the end of the  third
quarter, and about 2.5 times by the end of the year."

For the third  quarter,  CEMEX  Mexico's  domestic  cement volume is expected to
remain  flat  versus the same  quarter a year ago and is expected to be 1% lower
for the first  nine  months of the year  versus  the same  period of last  year.
Cement volume year to date has been driven  primarily by the residential  sector
and to a lesser  extent by spending  in  infrastructure.  The  self-construction
sector remains stable.  For the full year,  cement volume growth is now expected
to be flat versus 2004.

Cement sales volumes for CEMEX's operations in the United States are expected to
increase  2% in the third  quarter  versus the same  quarter of last year.  This
increase  includes the effect of the consolidation of RMC's operations for third
quarter 2005 and the sale of assets  completed on March 31, 2005.  For the first
nine months of 2005 cement  volumes are  expected to increase 4% versus the same
period in 2004.

In the United States, on a like-to-like basis for the ongoing operations, cement
volumes  would have  increased 6% both for the quarter and the first nine months
of the year versus the same periods last year. For the full year, we continue to
expect cement sales volumes to increase  about 5% versus 2004 on a  like-to-like
basis.

All segments of cement  demand in the United  States have been strong during the
year. The residential  sector continues to benefit from favorable  interest-rate
environment, while spending on infrastructure - especially on street and highway
construction and maintenance - remains strong.

Cement sales volumes for CEMEX's operations in Spain are expected to remain flat
versus the third  quarter of last year,  and to  increase  5% for the first nine
months of 2005 compared to the same period in 2004. Residential construction has
been  one  of  the  main  drivers  of  demand  during  the  year.   Spending  in
infrastructure  has also  contributed  to the increased  levels of cement demand
year to date. For the full year, we are increasingly confident that we will meet
our 3% volume growth in the full year guidance.

In the United  Kingdom,  cement sales volumes for the third quarter are expected
to decrease by about 3% versus RMC's volumes for the third quarter of last year.
For the first nine months of the year, cement volumes are expected to decline by
about  2%  compared  to  those  of RMC for the same  period  of last  year.  The
reduction   in  volumes  is  mainly  due  to  a  decline  in   spending  on  the
infrastructure and maintenance and repairs sectors. In addition, the residential
construction  sector  continues to reduce its growth rate compared to last year.
For the full year,  we now expect cement  volumes to decrease  between 2% and 3%
versus RMC's 2004 volumes.

The  performance of the rest of the portfolio for the year is, in the aggregate,
in line with our previously stated guidance. We expect full-year EBITDA and free
cash flow to benefit from the  positive  momentum  experienced  during the first
nine months of the year as well as from the incorporation of the RMC operations.

Guidance  numbers are  calculated on the basis of market close exchange rates as
of September 9, 2005.

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.

                                    -- ### --

This press release contains forward-looking  statements and information that are
necessarily subject to risks, uncertainties and assumptions.  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.

EBITDA is defined as operating income plus depreciation and  amortization.  Free
Cash Flow is defined as EBITDA minus net interest expense, capital expenditures,
change in working capital,  taxes paid,  dividends on preferred equity and other
cash items. Net debt is defined as total debt plus equity obligations minus cash
and cash equivalents. The net debt to EBITDA ratio is calculated by dividing net
debt at the end of the quarter by EBITDA for the last twelve months.  EBITDA for
the last twelve months  includes the estimated  EBITDA for RMC for those periods
not  consolidated in CEMEX. All of the above items are presented under generally
accepted accounting  principles in Mexico. EBITDA and Free Cash Flow (as defined
above) are presented herein because CEMEX believes that they are widely accepted
as  financial   indicators  of  CEMEX's   ability  to  internally  fund  capital
expenditures and service or incur debt.  EBITDA and Free Cash Flow should not be
considered as indicators of CEMEX's  financial  performance,  as alternatives to
cash flow, as measures of liquidity or as being  comparable  to other  similarly
titled measures of other companies.