JP MORGAN Chase & Co's third-quarter net income plunged 91 per cent, down from $449 million (£283 million) to $40 million (£25.7 million).
America's second-largest US bank has lost money in investment banking.
JP Morgan was also forced to write off more loans to telecoms companies.
The bank employs 4,000 staff across the Bournemouth area but has declined to comment on how 4,000 redundancies announced recently will impact on its operations.
Its third-quarter profit is lower than earnings of any of the 10 biggest US banks, warn analysts.
JP Morgan's larger rival Citigroup has already reported third-quarter net income climbing 23 per cent to $3.92 billion (£2.52 billion), its fourth consecutive quarter of profit growth.
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