By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- Shares of Rio Tinto PLC climbed in London on Wednesday after a broker upgrade, bucking broader losses in the U.K. stock market.

The FTSE 100 index lost 0.1% to 6,670.17, setting it on track for a third consecutive day of falling values.

Movers: Rio Tinto PLC (RIO) gained 1.1% after Morgan Stanley lifted the mining giant to overweight from equal weight.

Precious-metals miner Fresnillo PLC rose 2.6% after UBS added the company to its most-preferred list.

Meanwhile, shares of AstraZeneca PLC (AZN) lost 1%. The drop in the pharmaceutical company shares followed a 3.6% loss from Tuesday, after the U.S. Treasury Department issued new rules meant to dampen a influx of merger's (including announced mergers involving AstraZeneca) intended to sidestep U.S. taxes.

Another company in the spotlight, Tesco PLC shares slipped 0.5%, continuing losses after the supermarket chain on Monday cut its full-year profit view by 250 million pounds ($409 million) on discovering an accounting error.

Tate & Lyle PLC fell 1.5% after Société Générale cut the ingredients maker to hold from buy.

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