By Shawn Langlois, MarketWatch

LONDON (MarketWatch) -- U.K. stocks gained Thursday in the wake of a European Central Bank interest-rate cut and better-than-forecast U.S. economic data.

The FTSE 100 gained 0.2% to end at 6,460.71.

Commodities trader Glencore International PLC was the top gainer in the index, rising 5.4% after saying its merger with Xstrata PLC is now complete.

Shire PLC was the top decliner in the FTSE 100. Its shares fell 6.7% after the drug maker said it sees full-year sales in the mid-to-high single digits, lower than its prior view. Its revenue fell short of expectations.

Shares of BG Group rose 4.3% after the oil and natural gas company reported a 0.8% decline in net profit for the first quarter, but said it was on track to meet project milestones for this year. Imperial Tobacco Group shares added 2.8%.

Royal Dutch Shell was another winner from the oil and gas sector, up 0.8% after the company said Chief Executive Peter Voser will retire in 2014.

Shares of Legal & General Group PLC rose 2.5% after the insurer said the outlook for its business is strong after posting a forecast-beating 28% rise in total first-quarter new business sales, helped by better performances for U.S. and U.K. businesses.

The European Central Bank said it will lower its main refinancing rate by 25 basis points to 0.5% while the rate on the marginal lending facility will be cut by 50 basis points to 1%. At a news conference, ECB President Mario Draghi said the central bank's monetary policy would remain accommodative. Read the full story.

Shares in London also failed to catch much of a lift from U.S. jobless claims falling to a five-year low, which boosted U.S. markets on Thursday.

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