As you are aware, NYMEX has arranged to reserve a limited number of shares of Common Stock for purchase by stockholders, lessees and ABCs of the Company through a Reserved Share Program being administered by Merrill Lynch as part of the Company’s initial public offering. Please note that only stockholders, lessees and ABCs of the Company have been invited to participate in this program.

You should have already received materials inviting you to purchase shares through the Reserved Share Program. (Those documents were mailed to your address of record. Please note that if your address of record is a maildrop at One North End Avenue you can obtain the documents at that location.) Those materials included a description of the program, along with information indicating that all shares purchased through the program must be locked up for a period of 270 days from the date of the public offering. In addition, the Indication of Interest Form that has to be executed and faxed back if you want to participate in the program required anyone who wished to express an interest in purchasing shares to agree to lock up their shares for that period of time.

Please be advised that the NYMEX Holdings, Inc. Board of Directors has now determined not to require a lockup as a condition to the purchase of shares through the Reserved Share Program. However, certain invitees (i.e., broker-dealers, associated persons, etc.) may be required to lock up their shares for three months in accordance with NASD Conduct Rule 2790. Those invitees will be contacted after they return their Indication of Interest Forms.

If you have already submitted an Indication of Interest Form, the lockup to which you have already agreed will not be enforced. You need not submit a new Indication of Interest Form unless you want to change the number of shares you are requesting. In that case, please call the Reserved Share Program at 1-866-276-1462 (+1-609-274-3067 outside of the U.S. and Canada) and a new form will be sent to you. When you submit the new Indication of Interest Form you need not answer the question asking if you agree to lock up any shares you may purchase.

If you have not submitted an Indication of Interest Form but now wish to do so, please complete the form contained in the materials you have already received and return it according to the instructions. However, you need not answer the question asking if you agree to lock up any shares you may purchase. If you no longer have the Indication of Interest Form but now wish to submit one, please call the Reserved Share Program at 1-866-276-1462 (+1-609-274-3067 outside of the U.S. and Canada) and a new form will be sent to you.

Because of the change described above, the deadline for returning forms to Merrill Lynch has been extended to 10:00 p.m. New York Time on Friday, November 10, 2006.

The following statement is required to be included in this letter by the rules and regulations of the United States Securities and Exchange Commission:

“A Registration Statement relating to these securities has been filed with the Securities and Exchange Commission but has not yet become effective. These securities may not be sold nor may offers to buy be accepted prior to the time the Registration Statement becomes effective. If you wish to receive a copy of the prospectus relating to the public offering, please write to Merrill Lynch, 4 World Financial Center, Prospectus Dept., 4th Floor, New York, New York 10080 and a copy will be sent to you. You may also download a copy from the S.E.C. website by clicking on http://www.sec.gov/Archives/edgar/data/1105018/000119312506218815/ds1a.htm.”

The Company does not wish to influence in any way your decision in this matter. This notice is not designed to encourage you to request any Common Stock. It is simply intended to inform you that there is a proposed offering, should you be interested in investing. The purchase of Common Stock involves certain risks which are described in the preliminary prospectus. Please review the preliminary prospectus carefully and discuss it with your financial advisor, if appropriate.