LONDON, June 25 (Reuters) - Martin Sorrell's WPP said trading had improved in the last two months due to stronggrowth in advertising markets in the United States and Britain.
The firm, the world's largest advertising group, saidrevenue on a like-for-like basis was up 7.6 percent in the firstfive months of the year, compared with the 7 percent riserecorded in the first three months.
The group, which has been outperforming its rivals in recentmonths in terms of organic growth, said its gross margin wasalso ahead of last year and in line with forecasts.
"Following the group's record year in 2013, 2014 has startedstronger and similar to the final quarter of 2013," it said.
Shares in the group were down 0.5 percent in midday trading. (Reporting by Kate Holton, editing by James Davey)