Mittal Steel Co N.V. – ‘20-F’ for 12/31/04 – EX-12.1

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-12.1   —   Certifications

EX-12.1
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                                                                    Exhibit 12.1

CERTIFICATIONS OF MITTAL STEEL COMPANY N.V.'S CHIEF EXECUTIVE OFFICER AND CHIEF 
FINANCIAL OFFICER PURSUANT TO RULE 13A-14(A) UNDER THE EXCHANGE ACT             

I, Mr. Lakshmi N. Mittal, certify that:                                         

1. I have reviewed this annual report on Form 20-F of Mittal Steel Company N.V.;

2. Based on my knowledge, this report does not contain any untrue statement of a
material fact or omit to state a material fact necessary to make the statements 
made, in light of the circumstances under which such statements were made, not  
misleading with respect to the period covered by this report;                   

3. Based on my knowledge, the financial statements, and other financial         
information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the Company as of, 
and for, the periods presented in this report;                                  

4. The Company's other certifying officer and I are responsible for establishing
and maintaining disclosure controls and procedures (as defined in Exchange Act  
Rules 13a-15(e) and 15d-15(e)) for the Company and have:                        

(a) Designed such disclosure controls and procedures, or caused such
    disclosure controls and procedures to be designed under our supervision,
      to ensure that material information relating to the Company, including its
 consolidated subsidiaries, is made known to us by others within those
  entities, particularly during the period in which this report is being
prepared;                                                           

    (b) Evaluated the effectiveness of the Company's disclosure controls and
procedures and presented in this report our conclusions about the   
     effectiveness of the disclosure controls and procedures, as of the end of
the period covered by this report based on such evaluation; and     

     (c) Disclosed in this report any change in the Company's internal control
   over financial reporting that occurred during the period covered by the
  annual report that has materially affected, or is reasonably likely to
materially affect, the Company's internal control over financial    
reporting; and                                                      

5. The Company's other certifying officer and I have disclosed, based on our    
most recent evaluation of internal control over financial reporting, to the     
Company's auditors and the audit committee of the Company's board of directors  
(or persons performing the equivalent functions):                               

     (a) All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which are    
  reasonably likely to adversely affect the Company's ability to record,
process, summarize and report financial information; and            

     (b) Any fraud, whether or not material, that involves management or other
   employees who have a significant role in the Company's internal control
over financial reporting.                                           

Date: March 31, 2005                                                            

/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.                                                                    

EX-12.1
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I, Mr. Aditya Mittal, certify that:                                             

1. I have reviewed this annual report on Form 20-F of Mittal Steel Company N.V.;

2. Based on my knowledge, this report does not contain any untrue statement of a
material fact or omit to state a material fact necessary to make the statements 
made, in light of the circumstances under which such statements were made, not  
misleading with respect to the period covered by this report;                   

3. Based on my knowledge, the financial statements, and other financial         
information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the Company as of, 
and for, the periods presented in this report;                                  

4. The Company's other certifying officer and I are responsible for establishing
and maintaining disclosure controls and procedures (as defined in Exchange Act  
Rules 13a-15(e) and 15d-15(e)) for the Company and have:                        

(a) Designed such disclosure controls and procedures, or caused such
    disclosure controls and procedures to be designed under our supervision,
      to ensure that material information relating to the Company, including its
 consolidated subsidiaries, is made known to us by others within those
  entities, particularly during the period in which this report is being
prepared;                                                           

    (b) Evaluated the effectiveness of the Company's disclosure controls and
procedures and presented in this report our conclusions about the   
     effectiveness of the disclosure controls and procedures, as of the end of
the period covered by this report based on such evaluation; and     

     (c) Disclosed in this report any change in the Company's internal control
   over financial reporting that occurred during the period covered by the
  annual report that has materially affected, or is reasonably likely to
materially affect, the Company's internal control over financial    
reporting; and                                                      

5. The Company's other certifying officer and I have disclosed, based on our    
most recent evaluation of internal control over financial reporting, to the     
Company's auditors and the audit committee of the Company's board of directors  
(or persons performing the equivalent functions):                               

     (a) All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which are    
  reasonably likely to adversely affect the Company's ability to record,
process, summarize and report financial information; and            

     (b) Any fraud, whether or not material, that involves management or other
   employees who have a significant role in the Company's internal control
over financial reporting.                                           

Date: March 31, 2005                                                            

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

Dates Referenced Herein   and   Documents Incorporated by Reference

				Referenced-On Page
This ‘20-F’ Filing		Date		First		Last			Other Filings
Filed on:		3/31/05		1		2			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