**EXHIBIT 31.1**

 

**Certification of the Principal Executive Officer**

**Pursuant to Section 302**

**of the Sarbanes-Oxley Act of 2002**

 

I, Mitchell Steinhause, certify that: 

 

1. I have reviewed this quarterly report on Form 10-Q ofNYMEX Holdings, Inc.; 

 

2. Based on myknowledge, 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 respectto 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 registrant as of, and for, theperiods presented in this report; 

 

4. Theregistrant’s other certifying officer(s) 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)) and internal control over financial reporting (asdefined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have: 

 

a. designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under oursupervision, to ensure that material information relating to the registrant, 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. designed such internal control overfinancial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements forexternal purposes in accordance with generally accepted accounting principles; 

 

c. evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusionsabout the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and 

 

d. disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during theregistrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and 

 

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

 

a. all significant deficiencies and materialweaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and 

 

b. any fraud, whether or not material, that involvesmanagement or other employees who have a significant role in the registrant’s internal control over financial reporting. 

 

Date:  August 8, 2005