Exhibit 4.41.3

Translation into English for

the benefit of Wilmington Trust

Monterrey, Nuevo León, May 12, 2010.

Banco Nacional de México, S.A.,

Integrante del Grupo Financiero Banamex,

División Fiduciaria

Calzada del Valle No. 350 Oriente

1er. Piso

Col.
Del Valle

San Pedro Garza García, Nuevo León 66220

Mexico

Attention:    Ms. Nelly Wing

Wilmington Trust (London) Limited

6 Broad Street Place

Fifth Floor

London EC2M 7JH

United Kingdom

Attention:    Ms. Elaine K. Lockhart

Reference is made to the Irrevocable Security Trust Agreement in Respect of Stock No. F/111388-5, dated September 3,
2009 (the Agreement), entered into among CEMEX, S.A.B. de C.V. (CEMEX SAB), Empresas Tolteca de México, S.A. de C.V. (Tolteca), Impra Café, S.A. de C.V. (Impra
Café), Interamerican Investments, Inc. (Interamerican), CEMEX México, S.A. de C.V. (CEMEX México), and Centro Distribuidor de Cemento, S.A. de C.V. (Cedice), as
settlors (CEMEX SAB, Tolteca, Impra Café, Interamerican, CEMEX México and Cedice, together, the Settlors); CEMEX México, Cedice, Mexcement Holdings, S.A. de C.V. (Mexcement) and
Corporación Gouda, S.A. de C.V. (Gouda), as issuers (CEMEX México, Cedice, Mexcement and Gouda, together, the Issuers); Banco Nacional de México, S.A., Integrante del Grupo Financiero
Banamex, División Fiduciaria, in its capacity as trustee (the Trustee); and Wilmington Trust (London) Limited, on its own behalf and in its capacity as Security Agent, for the benefit of the Participating Creditors, the
Refinancing Creditors (and their respective successors and assigns) and the other Secured Parties (the Beneficiary). Unless otherwise defined herein, capitalized terms defined in the Agreement, are used herein as therein defined.

On May 12, 2010, CEMEX España, S.A., acting through its Luxembourg Branch, issued
US$1,067,665,000 of 9.25% senior secured notes due 2020, and 115,346,000 of 8.875% senior secured notes due 2017, guaranteed by CEMEX SAB, CEMEX México and New Sunward Holding B.V. (together, the Additional Notes).
Because the purpose of the Additional Notes is to refinance existing indebtedness and, as a consequence, the Additional Notes will be deemed as Refinancing Debt and the holders of the Additional Notes will be deemed a Refinancing Party, in both
cases pursuant to the Agreement, by means of this letter the Settlors and the Issuers hereby inform the Trustee and the Beneficiary, and confirm, that the Additional Notes are secured in accordance with the terms set forth in the Agreement, and are
Secured Obligations and the holders of the Additional Notes are Secured Parties.



---

We appreciate you acknowledging receipt of this letter, by signing in the
space provided below.



|                      |  |                   |  |                 
|--------------------- |  | ----------------- |  | ----------------
|CEMEX, S.A.B. de C.V.
|                      | 
|By                    |  | /s/ Roger Saldaña
|                      |  | Name:             |  | Roger Saldaña   
|                      |  | Title:            |  | Attorney-in-Fact





|                                         |  |                   |  |                 
|---------------------------------------- |  | ----------------- |  | ----------------
|Empresas Tolteca de México, S.A. de C.V.
|                                         | 
|By                                       |  | /s/ Roger Saldaña
|                                         |  | Name:             |  | Roger Saldaña   
|                                         |  | Title:            |  | Attorney-in-Fact



|                         |  |                   |  |                 
|------------------------ |  | ----------------- |  | ----------------
|Impra Café, S.A. de C.V.
|                         | 
|By                       |  | /s/ Roger Saldaña
|                         |  | Name:             |  | Roger Saldaña   
|                         |  | Title:            |  | Attorney-in-Fact



|                                |  |                   |  |                 
|------------------------------- |  | ----------------- |  | ----------------
|Interamerican Investments, Inc.
|                                | 
|By                              |  | /s/ Roger Saldaña
|                                |  | Name:             |  | Roger Saldaña   
|                                |  | Title:            |  | Attorney-in-Fact



|                           |  |                   |  |                 
|-------------------------- |  | ----------------- |  | ----------------
|Cemex México, S.A. de C.V.
|                           | 
|By                         |  | /s/ Roger Saldaña
|                           |  | Name:             |  | Roger Saldaña   
|                           |  | Title:            |  | Attorney-in-Fact



|                                             |  |                   |  |                 
|-------------------------------------------- |  | ----------------- |  | ----------------
|Centro Distribuidor de Cemento, S.A. de C.V.
|                                             | 
|By                                           |  | /s/ Roger Saldaña
|                                             |  | Name:             |  | Roger Saldaña   
|                                             |  | Title:            |  | Attorney-in-Fact



|                                 |  |                   |  |                 
|-------------------------------- |  | ----------------- |  | ----------------
|Mexcement Holdings, S.A. de C.V.
|                                 | 
|By                               |  | /s/ Roger Saldaña
|                                 |  | Name:             |  | Roger Saldaña   
|                                 |  | Title:            |  | Attorney-in-Fact



2



---

|                                |  |                   |  |                 
|------------------------------- |  | ----------------- |  | ----------------
|Corporación Gouda, S.A. de C.V.
|                                | 
|By                              |  | /s/ Roger Saldaña
|                                |  | Name:             |  | Roger Saldaña   
|                                |  | Title:            |  | Attorney-in-Fact



|                           |  |  |  | 
|-------------------------- |  |  |  | 
|Acknowledgment of receipt:



|                                                                                             |  |                     |  |                    
|-------------------------------------------------------------------------------------------- |  | ------------------- |  | -------------------
|Banco Nacional de México, S.A.,
Integrante del Grupo Financiero Banamex,
División Fiduciaria
|                                                                                             | 
|By                                                                                           |  | /s/ Elva Nelly Wing
|                                                                                             |  | Name:               |  | Elva Nelly Wing    
|                                                                                             |  | Title:              |  | Delegado Fiduciaria
|                                                                                             |  | Date:               |  | 13-May-2010        



|                                  |  |                     |  |                
|--------------------------------- |  | ------------------- |  | ---------------
|Wilmington Trust (London) Limited
|                                  | 
|By                                |  | /s/ Elaine Lockhart
|                                  |  | Name:               |  | Elaine Lockhart
|                                  |  | Title:              |  |                
|                                  |  | Date:               |  |                



3