A whisper number refers to the purported, unofficial, and unpublished earnings per share (EPS) forecasts of professional traders and fund managers on Wall Street. The whisper number can also be applied to any news or data release in any market

A whisper number can also refer to the expected future earnings or revenues according to a herd of individual investors. In this sense, a whisper number could be compiled by a website polling its visitors. Essentially, the whisper number is the unofficial consensus of what earnings and revenue for a company will be at the next announcement.