* WPP ( WPP ) soars after saying trading trajectory improved in

recent months

* Admiral jumps after first-half results and share buyback

announcement

* Tritax Big Box REIT drops after placing £350 million share

sale

(Updates prices)

Aug 6 (Reuters) - The UK's FTSE 100 ended lower on Thursday,

tracking losses on Wall Street, as investors weighed a fresh

batch of corporate earnings including upbeat reports from

housebuilder Persimmon and advertising group WPP ( WPP ).

The blue-chip FTSE 100 index dipped 0.2% to end the

session at 10,867.89 points. The midcap FTSE 250 climbed

0.2% to 24,695.41 points, rising for the fourth consecutive day.

* Information and analytics group Relx ( RELX ) was among the

biggest drags on the FTSE 100, falling 4.1% as software stocks

retreated after AppLovin's ( APP ) revenue miss and Datadog's ( DDOG )

warning on revenue growth. Relx ( RELX ) was also trading

ex-dividend.

* Persimmon climbed 2.9% after the housebuilder

forecast annual home deliveries at the top end of its range,

while insurer Admiral jumped 5.4% after its first-half

results and share buyback announcement.

* Among the midcap stocks, WPP ( WPP ) soared 28.6%, on

track for its biggest single-day percentage gain in more than

three decades, after the ad firm said the trajectory had

improved in recent months, even as it reported a 4.7% drop in

first-half adjusted revenue.

* Investors are awaiting U.S. non-farm payrolls data on

Friday for clues on the health of the labour market and interest

rate trajectory.

* The downturn in Britain's construction industry eased in

July as commercial building and housebuilding weakened less

sharply, with builder optimism hitting its highest level since

before the Iran war, a survey by S&P Global showed.

* Among other movers, real estate investment trust Tritax

Big Box REIT dropped 4.1%, becoming the top decliner

in the FTSE 100, after it placed a £350 million share sale at

£1.64 a share.