By Razak Musah Baba

LONDON--AstraZeneca PLC (AZN.LN) Friday reaffirmed its 2015 earnings guidance and said it has revised its financial reporting structure to include an additional revenue stream.

The pharmaceutical giant usually reports revenue from product sales only, with "externalization revenue" reported as operating income, it said. From January, externalization revenue, alongside product sales, will contribute to total revenue.

"Externalization revenue includes development, commercialization, partnership and out-license revenue, such as royalties and milestone receipts, together with income from services or repeatable licenses," the company said.

To reflect the change, AstraZeneca said total revenue for 2015 is expected to decline by a mid-single-digit percentage at constant exchange rates, consistent with its previous guidance.

It added that its core earnings per share are still expected to increase by a low single-digit percentage at constant exchange rates.

The company also reaffirmed that based on current exchange rates, total revenue is expected to decline by a low double-digit percentage.

Write to Razak Musah Baba at razak.baba@wsj.com

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