Frankfurt  - Shares in Deutsche Bank AG slumped Wednesday despite Germany's biggest bank saying it expects to report a third-quarter net profit of 1.4 billion euros (2.1 billion dollars).

In a preliminary report, the Frankfurt-based bank said its pre-tax profit came in at 1.3 billion euros in the three months to the end of September.

Deutsche said all of its business segments reported positive results in the quarter under review.

However, after chalking up big gains in recent months, Deutsche's shares dropped 2.7 per cent to 53.85 euros following the surprise earnings' announcement.

Details of the bank's third-quarter earnings are to be released on Ocober 29.(dpa)