THE former head of New York foreign exchange trading at Barclays Plc鈥檚 investment bank became the lender鈥檚 third trader to face US charges related to market manipulation, as prosecutors pursue officials responsible for misconduct that has led to $10 billion in fines.

Robert Bogucki, 45, faces seven charges over his role in a multimillion-dollar front-running scam that defrauded Hewlett-Packard Co., the US Justice Department said Tuesday. The case relates to the manipulation of foreign-exchange options before HP鈥檚 $11 billion takeover of Autonomy Corp. in 2011, according to prosecutors.

鈥淏ogucki and others allegedly not only betrayed his client鈥檚 confidences, but also risked undermining public trust in the foreign-exchange options market,鈥 Assistant US Attorney John P. Cronan said in a statement. We 鈥渞emain committed to protecting American interests by investigating and prosecuting sophisticated schemes,鈥 he said.

US authorities have been pursuing criminal prosecutions following a global crackdown on currency (FX) rigging that saw banks pay more than $10 billion in penalties. At least eight traders have been charged over behavior uncovered in the scandal, including three from JPMorgan Chase & Co., Barclays and Citigroup Inc. They鈥檙e known as the 鈥淐artel,鈥 and are scheduled to go on trial in June.

The other Barclays traders, Chris Ashton and Jason Katz, were charged by the US in separate price fixing cases. In October, former HSBC Holdings Plc currency trader Mark Johnson was found guilty of fraud for front-running a $3.5 billion client order.

Barclays was Hewlett-Packard鈥檚 financial adviser on the Autonomy transaction. Bogucki, who appeared in federal court in Brooklyn, New York, on Wednesday, was released on $500,000 bond and ordered to appear in federal court in San Jose, California. No date was set for that appearance. He鈥檚 charged with one count of conspiracy to commit wire fraud and six counts of wire fraud.

鈥淢r. Bogucki is innocent,鈥 his lawyer, Sean Hecker, said in a statement. 鈥淗e tried hard to do right by HP while following the rules that governed market makers in foreign exchange for many years. This action is nothing more than an unfair and misguided attempt to rewrite those long-standing rules.鈥

Bogucki allegedly misused confidential information Hewlett-Packard provided Barclays, which hired the bank to carry out a foreign-exchange transaction relating to its planned UK acquisition of Autonomy, according to the indictment. The transaction required the sale of 6 billion pounds ($8.3 billion) of options in September 2011, the Justice Department said.

While Bogucki promised HP the transaction 鈥渨ill be kept very quiet鈥 and claimed he was 鈥渘ot touching the market,鈥 prosecutors say he instead declared during one telephone call, 鈥渨e need to figure out what to do with this information,鈥 then directed options trading to try to lower the price of volatility — a metric that affects the value of currency options — to the benefit of Barclays at Hewlett-Packard鈥檚 expense.

In electronic chats with Bogucki, one Barclays trader said he and other traders would 鈥渂ash the sh-t out of鈥 and 鈥渟pank the market鈥 to depress the price of volatility, according to the indictment.

Bogucki directed Barclays FX traders to further depress the price for currency options but cautioned them they needed to be discreet to avoid the attention of senior Barclays executives, saying, 鈥渋f it gets back to HP by some loose lipped market monger that we鈥檙e selling,鈥 he warned they鈥檇 be in trouble — using profanities to emphasize the point.

Spokeswomen for Barclays and HP declined to comment.

Barclays was among four global banks that were ordered to pay a combined $2.5 billion to the Justice Department in 2015 after admitting to rigging currency rates.—听Bloomberg