LONDON--WPP PLC (WPP.LN) said Thursday it is in the process of reviewing its forecasts as it reported an 8.3% rise in first-quarter revenue in sterling terms, boosted by favorable currency swings and strong growth across regions except West Continental Europe.

The world's largest advertising agency added that based on early indications, like-for-like revenue and net sales growth will be over 3%, with a stronger second half, partly the result of easier comparatives. It added that it is considering raising the dividend payout ratio from 45%, after achieving this target a year ahead of schedule. It set the current 45% ratio in June 2013 and expected to achieve this over the following two years.

WPP, which owns agencies such as Ogilvy & Mather and Grey, said revenue rose to 2.78 billion pounds ($4.18 billion) from GBP2.57 billion as strong growth in the U.S. and U.K. again offset falls in Western Continental Europe. Net new business was almost $1 billion in the first quarter, compared with $1.28 billion in the first quarter last year.

WPP also benefited from more favorable currency swings in the quarter after a strong British pound against the U.S. dollar and euro weighed on profit last year, a trend that somewhat reversed in the last quarter of 2014.

In the first quarter, comparable net sales--a closely tracked revenue measure which strips out costs linked to acquiring digital media space and currency swings, acquisitions and disposals--rose 6% in sterling terms.

Chief Executive Martin Sorrell--known for his colorful economic predictions--has warned though that companies remain focused on cutting costs in a fragile economic and geopolitical environment even as WPP has posted rising sales and profit last year.

A fragile economy in the eurozone, political instability in the Middle East and the dramatic slowdown of the Russian economy are among his biggest concerns for clients, Mr. Sorrell said earlier this year.

Given the uncertainties on the horizon, WPP has targeted sales and profitability to reach a similar growth rate this year to last as the group tightly controls operating costs and concentrates on winning new business by making different agencies work more closely together.

-Write to Ruth Bender at ruth.bender@wsj.com and Ian Walker at ian.walker@wsj.com; @IanWalk40289749

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