proprietary trading
noun[U]
STOCK MARKET,FINANCEukus(alsoprincipal trading)tradingby afinancialorganizationto make aprofitfor itselfratherthanitscustomers:
No more than aquarterof a bank'scapitalcan bedevotedto asingleactivitysuch asproprietarytrading.
proprietarytradingactivities/operations