By Tom Sims and Frank Siebelt
FRANKFURT (Reuters) -Commerzbank's shares sank 5% on Friday, despite a big jump in net profit in the second quarter, after the German lender raised its cost outlook and cut its commission income forecast.
The less rosy outlook for net commission income and the raised cost expectations due to higher employee compensation were in line with what analysts had been expecting.
But analysts at KBW said they were disappointed about a lack of detail on plans for Commerbank's share buyback.
The bank announced plans for a further buyback that it hoped to conclude well ahead of next year's annual shareholder meeting, saying it had applied for regulatory approval.
Shares in Commerzbank (ETR:CBKG), one of Germany's best-known lenders that is partially owned by the government after a bailout more than a decade ago, widened their losses during morning trade and were the biggest loser on Germany's benchmark DAX index.
The fall came despite Commerzbank's net profit rising a better-than-expected 20%, aided by higher interest rates but held back by previously flagged problems in Poland.
Commerzbank raised its outlook for full-year net interest income to 7.8 billion euros ($8.54 billion) from previous expectations of some 7 billion euros, above expectations.
The bank is in the middle of a major overhaul, slashing its workforce and branch network to restore profits.
Like many banks, it is benefiting from a rise in interest rates and the income that generates, which was up 44% in the quarter from a year earlier.
Net profit of 565 million euros in the quarter compared with a profit of 470 million euros a year earlier. Analysts had on average forecast profit of 538 million euros, according to a consensus published by Commerzbank.
Analysts with Deutsche Bank (ETR:DBKGn) called the results "solid".
The bank increased the provisions it sets aside for bad loans and related writedowns to 208 million euros, up from 106 million euros, but it said credit quality remained high.
It took a 347 million euro hit in the quarter from a provision it announced in June following a court ruling on how banks treat Swiss franc loans in Poland, where it has extensive operations with its mBank unit.
Commerzbank said that it now expects costs of 6.4 billion euros this year, up from earlier expectations of 6.3 billion.
($1 = 0.9132 euros)