LuckyPanda, Do you think Quiet period is about 4 to 6 weeks of the time for new IPO's (I believe it applies also after 40 to 90 days of IPO) and Business changes (mergers). Is it same? Googled "Quiet Period"
During the four weeks prior to the close of the business quarter, which is known as "the quiet period", company executives are forbidden to speak to the public about the business in order to avoid giving analysts, journalists, certain registered investment advisors, private investors, and portfolio managers an unfair advantage - details that would amount to insider information.
There is also a second "quiet period" for companies issuing an IPO (initial public offering).
They also said
Essentially, there are two kinds of quiet periods for publicly traded companies. The first surrounds a company’s initial public offering (IPO) and is heavily regulated by the SEC, while the second is more loosely defined, and refers to the period of time in which a company limits its interaction with investors and analysts immediately preceding or following the quarter-end, but before results are actually released.
DEFINITION of 'Quiet Period' In terms of an IPO, the period where an issuer is subject to a SEC ban on promotional publicity. The quiet period usually lasts either 40 or 90 days from the IPO.
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