By Rory Gallivan

LONDON--Advertising giant WPP PLC (WPP.LN) said Tuesday some of its information technology systems have been affected by a global cyber attack.

The London-listed company said in a brief stock exchange announcement that it is "assessing the situation and is taking appropriate measures."

Shares were recently down 16 pence, or 1%, at 1,638 pence, valuing the company at GBP20.85 billion ($26.63 billion).

-Write to Rory Gallivan at rory.gallivan@wsj.com; Twitter: @RoryGallivan

(END) Dow Jones Newswires

June 27, 2017 11:45 ET (15:45 GMT)

Copyright (c) 2017 Dow Jones & Company, Inc.
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