Used in the context of general equities. Guaranteed a specific price on the customer's working order while the dealer tries to obtain a better one. Stopped against one's self involves a customer order and a firm's own account, not two customers. One can still cancel his order even after being stopped by another party.
STOPPED
Meaning of STOPPED in English
Campbell R. Harvey. Hypertextual finance English glossary. Английский словарь гипертекстовых финансов. 2012