A 39 per cent drop in profits has been announced by the Swiss lender for the third quarter of 2011 - a sum affected by the money lost during the headline-making scandal.
According to the financial institution, monitoring controls created to ensure valid trading practices were not in use at the end of December last year.
It was found that a check needed to confirm trades with fellow organisations was not in operation, while systems were not in place that should record changes to trades.
The bank stated: "Investigations are ongoing and management may become aware of facts relating to the investment bank that cause it to broaden the scope of the findings."
Despite the slump, UBS saw its core wealth management business perform relatively well over the third three-month period of the year, with the lender able to effectively manage money for wealthy clients.
By Asim Shah