The Financial Markets Authority is aware of the international inquiries, and will "continue to monitor developments here and abroad, and to liaise with agencies in New Zealand, Australia and further afield," a spokesman said in an emailed statement.
Since the allegations of global market manipulation emerged in a Bloomberg report last year, about 30 foreign exchange traders have been suspended, put on leave, or fired, of which seven have come from Swiss bank UBS, the world's fourth-biggest currency trader, according to a Reuters report. Other firms reported to have suspended, put on leave, or fired staff include Citigroup, Royal Bank of Scotland Group, and Barclays.
Earlier this month the Bank of England, the UK central bank, suspended a staff member pending an internal review into allegations its employees were aware of the market manipulation.
The probe into foreign exchange trading comes after a similar investigation into fixing the London Interbank Offered Rate, the borrowing rate between lenders known as the Libor. That probe resulted in financial institutions paying some US$6 billion to settle civil and criminal claims.