By Nick Kostov

LONDON (MarketWatch) -- U.K.'s FTSE 100 index was on track for an almost eight-week high on Wednesday, with well-received earnings from companies such as EasyJet PLC and ARM Holdings PLC boosting sentiment.

The benchmark gained 0.7% to 6,641.48, after posting a 0.4% decline on Tuesday.

Posting the biggest gain in the index, shares of EasyJet jumped 8.7% after the low-cost airline reported revenue for the third quarter is 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 4.6% after reporting record non-rail 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.

ARM (ARMHY) shares picked up 3.9%, after the chip designer reported a 27% increase in first-half revenue to GBP341.5 million. 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).

Also on investors' mind on Wednesday, shares of GlaxoSmithKline PLC put on 1.6% ahead of the drug maker's earnings report later in the day. Shares have dropped over the past three trading days amid allegations of bribery in China. Chief executive Andrew Witty has indicated he will outline Glaxo's response to the scandal when the company reports.

In the food industry, shares of Compass Group PLC gained 1.7%, 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 1.9% after saying its outlook for the year remains unchanged and reporting operating profit for the quarter in line with expectations.

Other large companies to report were home-improvement giant Kingfisher PLC , whose shares rose 1.8% after reporting its comparable sales for the 10 weeks to July 13 rose 2.5%.

Property-investment firm British Land Co. PLC slipped 1.1% after reporting encouraging demand for its space but adding retail remains a challenge.

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