Exhibit 1

Buy-back programme Transaction in own shares WPP plc (“WPP” or the “Company”) announces that on 10 May 2018 it purchased for treasury 160,000 of its ordinary shares at an average price of 1298.9347 pence per ordinary share. Details of the relevant repurchase transactions are set out below:
Description of shares:	WPP plc ordinary shares of 10 pence each
Number of shares repurchased:	160,000
Date of transaction:	10 May 2018
Time of transaction:	08:50 – 16:30
Price (pence):	1298.9347
Trading venue:	London Stock Exchange
Broker:	Merrill Lynch International
Following the above purchase, WPP holds 67,289,968 ordinary shares as treasury shares. The total number of WPP shares in issue is 1,265,311,009 (excluding shares to be held in treasury). All transactions under this programme will be published on the Company’s website (www.wpp.com) on a daily basis. Enquiries:

Marie Capes, Company Secretary 020 7408 2204