This excerpt taken from the NYX DEF 14A filed Mar 2, 2009.
Under our by-laws, for director nominations or other business to be brought before our 2010 Annual Meeting, other than Rule 14a-8 proposals described under Stockholder Proposals for 2010 Annual Meeting above, written notice must be delivered to the Corporate Secretary, NYSE Euronext, 11 Wall Street, New York, NY 10005, no earlier than the close of business on December 3, 2009 and no later than the close of business on January 2, 2010. Such notices must also comply with the requirements of our by-laws.
If the date of our 2010 Annual Meeting is more than 30 days before or more than 60 days after April 2, 2010, the submission deadlines set forth above will be changed in accordance with our by-laws. In that case, our by-laws provide that to be timely, notice must be delivered as provided above not earlier than the close of business on the 120th day prior to our annual meeting and not later than the close of business on the later of the 90th day prior to the annual meeting or the 10th day following the day on which we first make a public announcement of the meeting date.