By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- European stocks lost ground Tuesday following five sessions of gains, but Alcatel-Lucent SA shares outperformed, jumping as the French telecommunications-equipment company talks for a possible buyout by Nokia Corp.

The Stoxx Europe 600 has been darting between small gains and losses. Most recently, it slipped 0.1% to 413.08 as financial and telecom shares flipped into the red.

However, Alcatel shares topped the pan-European benchmark with an 11% surge after Finland's Nokia (NOK) confirmed it is in advanced talks to buy its French rival. There are no details about the possible valuation of the deal, which may not go through, the companies said.

Alcatel shares led advancers on France's CAC 40 , but overall, that index was down 0.2% at 5,242.59.

Nokia shares fell 7%, the sharpest decliner on the Stoxx 600.

A tie-up between the two networking and telecoms equipment makers would follow years of speculation about a possible deal (http://www.marketwatch.com/story/nokia-confirms-talks-to-buy-alcatel-lucent-2015-04-14). If they merge, it would create a new global networking heavyweight to rival Sweden's Ericsson (ERICY) and China's Huawei Technologies.

European investors last week saw huge M&A deals announced, with British oil giant Royal Dutch Shell PLC agreeing to take over BG Group PLC for GBP47 billion ($68.7 billion), and Dutch parcel-delivery company TNT Express NV agreeing to be purchased by FedEx Corp. (FDX) for about EUR4.4 billion ($4.64 billion).

Meanwhile, investors are still grappling with what Greece's debt troubles may mean for the future of the eurozone. The Financial Times on Tuesday reported the country is preparing to default on some of its debt payments. Greek officials have denied the report. Greece's Athex Composite lost 0.8% to 771.09. Trading was closed Monday for the Orthodox Easter holiday.

Germany's DAX fell 0.6% to 12,266.07, while the U.K.'s FTSE 100 was flat at 7,063, losing its grip on earlier gains. The pound (GBPUSD) fell to $1.4615 after the release of data showing U.K. consumer prices were flat in March (http://www.marketwatch.com/story/uk-consumer-prices-stay-flat-in-march-2015-04-14-4485508).

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