proprietary trader
noun[C]
STOCK MARKET,FINANCEukus(alsoprop trader)anemployeeof afinancialorganizationwho uses the organization’smoneytotradeinshares,stocks,bonds, etc. inorderto make aprofitfor theorganizationratherthan foritscustomers:
Theproprietarytraderstradedcompanymoneytoincreasebankprofitsandtheirownpaychecks.
Aproptraderat Deutsche Banklost$1.8bn in 2008.