By Nick Kostov

LONDON (MarketWatch) -- The U.K.'s FTSE 100 index broke a three-day losing streak on Wednesday, with well-received earnings from companies such as EasyJet PLC and Kingfisher PLC boosting sentiment.

The benchmark gained 0.4% to 6,620.43 after posting a 0.4% decline on Tuesday. Read commentary: Five ways to bet on a British economic recovery.

Posting the biggest gain in the index, EasyJet jumped 3.7% after the low-cost airline reported revenue for the third quarter was up 10.5% to 1.14 billion pounds ($1.75 billion), buoyed by an increase in capacity and improvement in revenue per seat. The airline now expects profit before tax for the year to be between GBP450 million and GBP480 million, up on the GBP317 million recorded last year.

Public-transport operator National Express PLC added 3.7% after reporting record nonrail results, but posted a 13.8% reduction in first-half pretax profit as it was hit by cost inflation, government cuts and the end of a rail contract.

Other large companies to report were home-improvement giant Kingfisher PLC , whose shares rose 3.1% after reporting its comparable sales for the 10 weeks to July 13 rose 2.5%.

Also on investors' mind on Wednesday, shares of GlaxoSmithKline PLC (GSK) rose 0.5%, as the British pharmaceuticals firm posted a 2% increase in sales during the second quarter. Net profit was GBP1.05 billion, below analyst expectation of GBP1.27 billion, and 16% down on the same period last year. Separately, Glaxo's chief executive officer Andrew Witty said the firm will commission an independent review to investigate the allegations some of its senior executives had broken the law in China.

In the food industry, shares of Compass Group PLC gained 1.1%, as the contract food-service company reported its expectations for the full year remain unchanged after strong third-quarter growth in North America and its emerging markets.

Sugar manufacturer Tate & Lyle PLC added 3.6% after saying its outlook for the year remains unchanged and reporting operating profit for the quarter in line with expectations.

On a more downbeat note, property-investment firm British Land Co. PLC slipped 0.9% after reporting encouraging demand for its space but adding retail remains a challenge.

ARM Holdings PLC (ARMHY) lost 1.1% after posting a drop in first-half profit although revenue rose 27%. The Cambridge-based company has benefited from exponential growth in the mobile-device market in recent years, but is now facing increased competition, particularly from Intel Corp. (INTC).

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