Used in the context of general equities. Market or limit order to sell a stated amount of stock provided that the price to be obtained is not lower than the last sale if the last sale was a plus , or zero plus tick , and is not lower than the last sale plus the minimum fractional change in the stock if the last sale was a minimum or zero minimum tick. (if a limit order , sale cannot be lower than the limit regardless of tick).
SELL PLUS ORDER
Meaning of SELL PLUS ORDER in English
Campbell R. Harvey. Hypertextual finance English glossary. Английский словарь гипертекстовых финансов. 2012