Kweku Adoboli, the trader accused of costing UBS AG $2.3 billion by making unauthorized trades, falsified records on exchange-traded-fund transactions, prosecutors said.

Prosecutors amended two of the four charges against Adoboli to indicate that records he allegedly falsified were on ETF trades. A London magistrates court yesterday transferred the case against the 31-year-old to a criminal court where he will be expected to enter a plea on the accusations at a Nov. 22 hearing.

The charges, which also include two counts of fraud and date back to 2008, cover "a large number of transactions," prosecutor David Williams said at the hearing yesterday. "He exposed the bank to risk of large losses."

Adoboli has been in custody since his arrest on Sept. 15, when UBS asked the City of London police to detain him after he reported the losses. He was charged two days later with fraud and false accounting. The trading loss prosecutors claim he was responsible for led to the departures of Chief Executive Officer Oswald Gruebel and the co-heads of the Swiss bank's global equities business. Adoboli was fired by the bank on Sept. 17, Williams said.

ETFs are exchange-listed products that mirror indexes, commodities, bonds and currencies and allow investors to buy and sell them like stocks.

Adoboli, who holds a Ghanaian passport, appeared before a panel of three judges yesterday and his lawyer Patrick Gibbs said he wouldn't indicate how his client planned to plead. He said through his lawyer at a hearing last month he was "sorry beyond words" for his "disastrous miscalculations."