Experian PLC, the world's largest credit-checking company, said Wednesday that its first-half profit climbed 15% from a year earlier, to $258 million, and that its cost-cutting program is ahead of schedule.

The Dublin company's shares rose as much as 14%, the most since they began trading in October 2006. Experian said it lowered expenses in the period by $29 million by cutting jobs and outsourcing data operations to locations including Kuala Lumpur.

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