By Josie Cox 

European bank stocks have slipped in October, seemingly dismissing satisfactory results from the European Central Bank's stress tests and data showing a pickup in the appetite for lending.

The Stoxx Europe 600 bank index dropped more than 1% Thursday, taking declines so far this month to almost 6% and making the financial sector one of the worst performing.

Banca Monte dei Paschi di Siena, which failed the ECB's health check, was the worst performer across all sectors, closely followed by Greek peers National Bank of Greece SA and Eurobank Ergasias SA, who also flunked the assessment. Stocks in core European lenders including Deutsche Bank AG also felt the heat.

Some traders pointed to comments from Andrea Enria, chairman of the European Banking Authority, warning that even those lenders who passed the stress tests shouldn't feel too secure and that "there is still work to be done." Others said the sector may have become overheated in recent weeks and was now suffering a snapback.

During the summer, the financials index took a beating on mounting global economy fears. Mid-October saw signs of recovery, with the index climbing by more than 7% to just before the stress test results were announced on Oct. 26. So far this week it has lost around 3%.

"Bank stocks had rallied because investors had been fearful of getting caught-out underweight financials if, for example, the ECB announces more stimulus measures or the Comprehensive Assessment was benign," Nick Anderson, an analyst at Berenberg Bank, said.

"The stress test wasn't a disappointment for the market, and results came in broadly in line with expectations, but investors are still very cautious on the sector," Mr. Anderson added, saying that the selloff appears to be self-perpetuating.

Over the weekend, regulators identified 13 banks in Europe that still need to come up with a total of EUR9.5 billion ($12 billion) in extra capital to ensure they would be able to weather a potential financial crisis. Twenty-five banks technically failed the tests, facing a cumulative shortfall of EUR24.6 billion.

"The tests certainly weren't a failure and we certainly gained a lot of transparency from them, but this is not the big bang that is going to kick-start the economic recovery," Jürgen Odenius, chief economist at Prudential Fixed Income said. He said that the European banking system remains "over-levered and over-banked" and that therein lies the problem.

Although equity markets initially rose after the results of the tests, they snapped back quickly, with some analysts questioning the assessment's credibility and others doubting whether the outcome would stimulate a necessary revival in bank lending.

"A lot of people appear to have hoped that the results of the bank stress tests would solve some of the problems still facing the economy and the banking system," said Nick Lawson, Deutsche Bank's head of macro, synthetics and cross-selling. "What they actually did was simply hold up a mirror to the banks and investors, showing them where the weaknesses still lie," he added.

A run of poor data from the eurozone published in the first half of this October and largely covering August and September fueled concerns the bloc's anemic recovery had ended, threatening a slide into a period of deflation.

Sentiment remains fragile, even though data Thursday showed that businesses and consumers across the eurozone became slightly more upbeat about their prospects during October.

Bank earnings so far this season have also painted a mixed picture at best.

Deutsche Bank AG on Wednesday reported that it had swung to a net loss in the third quarter after it boosted its reserves to cover possible fines from pending litigation.

Earlier in the week Swiss bank UBS AG reported a weaker-than-expected rise in third-quarter profit, hurt by 1.8 billion Swiss francs ($1.9 billion) of legal provisions.

"I think that what people have realized anew is that bank performance is intricately linked to the health of the macro economy, where there are still a lot of underlying issues that need to be solved," Mr. Lawson said.

Write to Josie Cox at josie.cox@wsj.com

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