Quiet Period

There are two time windows commonly referred to as "quiet periods" during an IPO's history. The first and the one linked above is the period of time following the filing of the company's S-1 but before SEC staff declare the registration statement effective. During this time, issuers, company insiders, analysts, and other parties are legally restricted in their ability to discuss or promote the upcoming IPO.
The other "quiet period" refers to a period of 40 calendar days following an IPO's first day of public trading. During this time, insiders and any underwriters involved in the IPO, are restricted from issuing any earnings forecasts or research reports for the company. Regulatory changes enacted by the SEC as part of the Global Settlement, changed the quiet period to 40 days from 25 days on July 9, 2002. When the quiet period is over, generally the lead underwriters will initiate research coverage on the firm.