Barclays bank has said its income fell by £500m ($790m) in July and August from a year ago and says it "remains cautious" about the current climate.
The drop was thanks to "significantly" lower revenues in its investment banking division.
Barclays also gave more details of the £5.95bn it wants to raise by issuing new shares to help plug a £12.8bn capital shortfall.
Shareholders are being offered one new share at 185p for every four they own.
The new shares are expected to begin trading on 4 October.
In a trading statement, the bank said: "Barclays continues to remain cautious about the environment in which it operates and its focus remains on costs, capital, leverage and returns in order to drive sustainable performance improvements."
It added that the investment bank's daily performance in September had improved from July and August, but was still below levels seen in September 2012.
Barclays said its cost-cutting plan was proceeding to plan and that it expected operating costs to be £18.5bn this year, excluding restructuring costs.
