LONDON--Adverting giant WPP PLC (WPP.LN) said Tuesday its wholly-owned operating company, Millward Brown, has bought InsightExpress, Inc., a provider of media analytics and marketing accountability solutions in the U.S. for an undisclosed sum.

InsightExpress' unaudited revenues for the period ended Dec. 31, 2013 were $26.4 million with gross assets of $8.8 million as of the same date. The company has over 200 clients.

Separately, WPP said its wholly-owned operating company GroupM, has agreed to buy Keyade, a digital search marketing agency in France, for an undisclosed sum.

The agency specializes in performance-driven online media purchasing. Its unaudited revenues for the year ended March 31 were 7.0 million Euros ($9.24 million) with gross assets of EUR 8.6 million as at the same date.

Shares at 0750 GMT up 21 pence, or 1.71%, at 1248 pence valuing the company at 16.44 billion pounds $27.24 billion).

-Write to Ian Walker at ian.walker@wsj.com

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