By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- Stocks edged lower across Europe on Thursday after the European Central Bank decided to leave its key interest rates unchanged.

The Stoxx Europe 600 lost 0.2% at 336.31. Just before the ECB said it will keep its key lending rate at 0.25%, the index was registering a fall of 0.1%. The central bank held its deposit rate at 0% and its marginal-lending rate at 0.75%.

The Stoxx Europe 600 had been swaying between small gains and losses throughout the session. On Wednesday, it posted its seven consecutive wins in a row.

Investors will now look for comments by ECB President Mario Draghi, who will hold his monthly news conference at 2:30 p.m. Frankfurt time, or 8:30 a.m. Eastern Time. Follow the ECB live blog.

Analysts, on average, expected the central bank to leave interest rates unchanged, though there's been pressure on policy makers to take action against low inflation. The ECB, meanwhile, has to consider a slate of improving manufacturing data and an overall pickup in economic growth. More on what the ECB decision could mean for investors.

Banking stocks were mixed, with HSBC Holdings PLC higher by 0.3%, Barclays PLC up 0.5%, while shares of Deutsche Bank AG fell 1.7% following a ratings downgrade to overweight from neutral by J.P. Morgan Cazenove.

Among country-specific indexes, losses accelerated on Germany's DAX 30 after the ECB rate decision, falling 0.3% to 9,599.06. Regarding the Deutsche Bank re-rating, final regulatory rules on additional valuation adjustments for Europe will likely reduce the German bank's capital by 2.2 billion euros ($3.03 billion) by the second or third quarter, according to J.P. Morgan Cazenove. "This decline is material for DB, considering its relatively tight capital position and market concerns regarding capital at risk," its analyst Kian Abouhossein said in a note to clients.

France's CAC 40 gave up 0.2% to 4,420.93. On the economic front, market-research group Markit said expansion in France's service sector in March ended four months of decline, driven by a rise in incoming new work. The activity index reached a 26-month high at 51.5, versus 47.2 in February.

The U.K.'s FTSE 100 was up less than 1 point at 6,659.26. Advancers led by Tullow Oil PLC , Aberdeen Asset Management PLC and Kingfisher PLC . Kingfisher shares rose 2.9% as the home-improvement retailer said it's in talks to buy Mr Bricolage, a move that would stretch its presence in the French market.

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