See Below - Tpac is one of those. It's on the list
Post# of 22940
"The Caveat Emptor Designation may be assigned when OTC Markets becomes aware of one or more of the following:
Promotion — The security is the subject of stock promotion that may be misleading or manipulative. Promotional activities may include news releases, spam email, and newsletters, whether they are published by the issuer or a third party. See OTC Markets Group's Policy on Stock Promotion.
Investigation of Fraud or Other Criminal Activities — There is an investigation or other indication of fraudulent or other criminal activity involving the company, its securities or insiders.
Suspension/Halt — A regulatory authority or an exchange has halted or suspended trading for public interest concerns (i.e. not a news or earnings halt).
Undisclosed Corporate Actions — The security or company is the subject of a corporate action, such as a reverse merger, stock split, or name change, without adequate current information being publicly available.
Other Public Interest Concern — OTC Markets Group may determine that there is a public interest concern regarding the security. Such concerns may include but are not limited to promotion campaigns (including third-party), unusual or unexplained trading activity, spam or disruptive corporate actions even when adequate current information is available."