Preferred stock that can be converted into common stock at the option of the holder. In contrast, to the usual preferred stock, the owner gets the value of the preferred stock refunded. That is, you get conversion plus the value of the stock.
PARTICIPATING CONVERTIBLE PREFERRED STOCK
Meaning of PARTICIPATING CONVERTIBLE PREFERRED STOCK in English
Campbell R. Harvey. Hypertextual finance English glossary. Английский словарь гипертекстовых финансов. 2012