Mittal Steel Co N.V. – ‘20-F’ for 12/31/04 – EX-13.1

On:  Thursday, 3/31/05, at 2:30pm ET   ·   For:  12/31/04   ·   Accession #:  950123-5-3893   ·   File #:  1-14666

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Annual Report of a Foreign Private Issuer   —   Form 20-F
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 20-F        Annual Report of a Foreign Private Issuer            230   1.31M 
 2: EX-4.3      Shareholder's Agreement                               19     71K 
 3: EX-8.1      List of Significant Subsidiaries                       2±     8K 
 4: EX-12.1     Certifications                                         2     15K 
 5: EX-13.1     Certifications                                         1      9K 
 6: EX-14.1     Consent of Deloitte Accountants B.V.                   1      7K 
 7: EX-14.2     Consent of Ernst & Young                               1      7K 
 8: EX-14.3     Consent of Kpmg Inc.                                   1     10K 
 9: EX-14.4     Consent of Ernst & Young                               1      7K 
10: EX-14.5     Consent of Ernst & Young                               1      7K 

EX-13.1   —   Certifications

EX-13.1
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                                                                    Exhibit 13.1

CERTIFICATIONS OF MITTAL STEEL COMPANY N.V.'S CHIEF EXECUTIVE OFFICER AND CHIEF 
FINANCIAL OFFICER PURSUANT TO RULE 13(A)-14(B) UNDER THE EXCHANGE ACT AND       
SECTION 1350 OF CHAPTER 63 OF TITLE 18 OF THE UNITED STATES CODE                

In connection with the Annual Report on Form 20-F of Mittal Steel Company N.V.  
(the "Company") for the year ended December 31, 2004 as filed with the          
Securities and Exchange Commission (the "Report"), Mr. Lakshmi N. Mittal, as    
Chief Executive Officer of the Company, and Mr. Aditya Mittal, as Chief         
Financial Officer of the Company, each hereby certifies that, to the best of his
knowledge and belief:                                                           

(1)   The Report fully complies with the requirements of Section 13(a) or 15(d) 
of the Securities Exchange Act of 1934; and                         

(2)   The information contained in the Report fairly presents, in all material  
respects, the financial condition and results of operations of the  
Company.                                                            

/s/ Mr. Lakshmi N. Mittal                                                       
--------------------------------------------------------------------------      
Mr. Lakshmi N. Mittal                                                           
Chairman of the Board of Directors and Chief Executive Officer of Mittal Steel  
Company N.V.                                                                    
March 31, 2005                                                                  

/s/ Mr. Aditya Mittal                                                           
--------------------------------------------------------------------------      
Mr. Aditya Mittal                                                               
President and Chief Financial Officer of Mittal Steel Company N.V.              
March 31, 2005                                                                  

This certification is furnished as an exhibit to the Report and accompanies the 
Report pursuant to Rule 13(a)-14(b) under the Securities Exchange Act of 1934,  
as amended (the "Exchange Act") and shall not be deemed filed by the Company for
purposes of Section 18 of the Exchange Act.                                     

Dates Referenced Herein   and   Documents Incorporated by Reference

This ‘20-F’ Filing		Date		Other Filings
Filed on:		3/31/05		6-K
For Period End:		12/31/04
				List all Filings

4 Subsequent Filings that Reference this Filing

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 2/28/24  ArcelorMittal                     20-F       12/31/23  201:85M
 3/08/23  ArcelorMittal                     20-F       12/31/22  201:89M
 3/11/22  ArcelorMittal                     20-F       12/31/21  204:102M
 3/08/21  ArcelorMittal                     20-F       12/31/20  196:71M