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 SHARES i 1. Identity of the issuer or the underlying issuer of existing sharesto which voting rights are attached: Keller Group plc 2 Reason for the notification (please tick the appropriate box or boxes): An acquisition or disposal of voting rights X 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 notification Franklin Templetonobligation: iii Institutional, LLC Bank of New York JP Morgan Chase Bank, N.A. Mellon Bank, N.A.4. Full name of shareholder(s) National Westminster Bank(if different from 3.): iv Plc The Northern Trust Company State Street Bank and Trust Company 5. Date of the transaction and date on which the May 6, 2015threshold is crossed or reached: v 6. Date on which issuer notified: May 7, 2015 7. Threshold(s) that is/are crossed or 4%reached: vi, vii 8. Notified details: A: Voting rights attached to shares viii, ix Class/type of Situation previous Resulting situation after the triggeringshares to the triggering transaction transaction if possible Number Number Number Number of voting % of votingusing of of of rights rights xthe ISIN CODE Shares Voting shares Rights Direct Direct Indirect Direct Indirect xi xii Ordinary .1 7,026,927 7,026,927 3,557,757 4.96%GB0004866223 B: Qualifying Financial Instruments Resulting situation after the triggering transaction Type of financial Expiration Exercise/ Number of voting % of votinginstrument date xiii Conversion rights that may be rights Period xiv 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 Expiration Exercise/ Number of % of voting rightsfinancial price date xvii Conversion voting xix, xxinstrument period rights xviii instrument refers to Nominal Delta Total (A+B+C) Number of voting rights Percentage of voting rights 3,557,757 4.96% 9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable: xxi Proxy Voting: 10. Name of the proxy holder: 11. Number of voting rights proxy holder will cease to hold: 12. Date on which proxy holder will cease to hold voting rights: 13. Additional Notification using the total voting rights figure ofinformation: 71,774,788 14. Contact name: Kerry Porritt Group Company Secretary 15. Contact telephone 020 7616 7575number: