Selling short stocks that is actually owned by the seller but held in the box , meaning it is held in safekeeping. The seller borrows securities needed to cover as the stocks in the box may be inaccessible or the seller may not wish to disclose ownership.
SELLING SHORT AGAINST THE BOX
Meaning of SELLING SHORT AGAINST THE BOX in English
Campbell R. Harvey. Hypertextual finance English glossary. Английский словарь гипертекстовых финансов. 2012