Cache Inc (CACH)

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Understanding Pink Sheets
Historically, pink sheets got their name from the color of the paper on which quotes of share prices were published. Today's trades are, of course, electronic, but the name lives on as a reference to OTC stocks.

Over-the-counter (OTC) refers to the process of trading for the securities of unlisted companies. The shares trade via a broker-dealer network rather than on a centralized stock exchange.

Pink sheets are OTC but they are not OTCBB. That is:

The Over-the-Counter Bulletin Board (OTCBB) is an electronic system that displays over-the-counter securities with real-time quotes and volume information. Shares listed on the OTCBB carry an "OB" suffix and must file financial statements with the Securities and Exchange Commission (SEC).1?
Shares trading on the pink sheet platform have a "PK" suffix and are under no requirements from the SEC to file financial information. For this reason, they are seen as high-risk investments.

https://www.investopedia.com/terms/p/pinksheets.asp