Holding(s) in Company

For filings with the FCA include the annex For filings with issuer exclude the annex TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi 1. Identity of the issuer or the underlying issuerof existing shares to which voting rights are Keller Group PLCattached:ii 2 Reason for the notification (please tick the appropriate box or boxes): An acquisition or disposal of voting rights An acquisition or disposal of qualifying financial instruments which may resultin the acquisition of shares already issued to which voting rights are attached An acquisition or disposal of instruments with similar economic effect toqualifying financial instruments An event changing the breakdown of voting rights Other (please specify): 3. Full name of person(s) subject to the BlackRock, Inc.notification obligation:iii 4. Full name of shareholder(s) (if different from 3.):iv 5. Date of the transaction and date onwhich the threshold is crossed or 21st October 2014reached: v 6. Date on which issuer notified: 22nd October 2014 7. Threshold(s) that is/are crossed or Holding has gone below 5%reached: vi, vii 8. Notified details: A: Voting rights attached to shares viii, ix Class/type Situation previous Resulting situation after the triggering transactionof to the triggeringshares transaction Number Number Number Number of voting % of voting rightsif possible of of of rights xusing Shares Voting sharesthe ISIN RightsCODE Direct Direct xi Indirect xii Direct Indirect GB0004866223 5,124,384 5,124,384 N/A N/A N/A N/A Below 5% B: Qualifying Financial Instruments Resulting situation after the triggering transaction Type of Expiration Exercise/ Number of voting % of votingfinancial date xiii Conversion Period xiv rights that may be rightsinstrument acquired if the instrument is exercised/ converted. C: Financial Instruments with similar economic effect to Qualifying FinancialInstruments xv, xvi Resulting situation after the triggering transaction Type of Exercise price Expiration Exercise/ Number of voting rights % of votingfinancial date xvii Conversion instrument refers to rights xix, xxinstrument period xviii Nominal DeltaCFD N/A N/A N/A Total (A+B+C) Number of voting rights Percentage of voting rights N/A Below 5% 9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable: xxi BlackRock Investment Management (UK) Limited - N/A (Below 5%) Proxy Voting: 10. Name of the proxy holder: 11. Number of voting rights proxy holder will ceaseto hold: 12. Date on which proxy holder will cease to holdvoting rights: Notification using the total voting rights figure of13. Additional information: 71,259,813 14. Contact name: Kerry Porritt 15. Contact telephone number: 0207 616 7575