Whisper Stock
Shares in a company that is rumored to be the target of a takeover offer. The source of whisper stocks could be anybody from an investment banker involved in a deal, to the spouse of an executive privy to the information.
Investopedia Commentary
Remember, the "whisper" is just a rumor. There is no guarantee that the company will actually be taken over.
Further, there is a real question to the legality of the information. Getting caught trading on insider information is a quick way to a jail sentence.
See also: Hostile Takeover, Insider Information, Takeover, Whisper Number
Also spelled: whisperstock
whisper stock