Holding(s) in Company

Iomart Group PLC 19 April 2007 TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached (ii): Iomart Group plc 2. Reason for the notification (please state Yes/No): An acquisition or disposal of voting rights: (Yes) An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached: (No) An event changing the breakdown of voting rights: (No) Other (please specify) : (No) 3. Full name of person(s) subject to the notification obligation (iii): Gartmore Investment Limited 4. Full name of shareholder(s) (if different from 3.) (iv): See Section 9 5. Date of the transaction (and date on which the threshold is crossed or reached if different) (v): 16 April 2007 6. Date on which issuer notified: 17 April 2007 7. Threshold(s) that is/are crossed or reached: 11% 8. Notified details: A: Voting rights attached to shares Class/type of shares if possible using Situation previous to the Triggering the ISIN CODE transaction (vi) Number of Number of voting Rights shares (viii) GB0004281639 10,639,195 10,639,195 Resulting situation after the triggering transaction (vii) Class/type of shares if Number of Number of voting % of voting possible using the ISIN CODE shares rights (ix) rights Direct Direct Indirect (xi) Direct Indirect (x) GB0004281639 11,044,686 11,044,686 11.108% B: Financial Instruments Resulting situation after the triggering transaction (xii) Type of Expiration Exercise/ Number of voting rights that may % of financial Date Conversion be acquired if the instrument is voting instrument (xiii) Period/ Date exercised/ converted. rights (xiv) Total (A+B) Number of voting rights % of voting rights 11,044,686 11.108% 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable (xv): Fund Number of Percentage UK Fund Beneficial owner Managing shares held of issued Registered Co. share Owner capital Gartmore Fund Managers 1,936,544 1.948% HSBC GLOBAL 56690 GARTMORE FUND MANAGERS Limited --------- -------- CUSTODY LTD A/C GARTMORE UK & NOMINEE UK IRISH SMALL COMPANIES LTD 1,936,544 1.948% --------- -------- Gartmore Investment Limited 3,268,540 3.287% VIDACOS VOLANT THE ALPHAGEN VOLANTIS NOMINEES FUND LIMITED LTD A/C 2303 Gartmore Investment Limited 3,218,540 3.237% GOLDMAN 63285 THE GARTMORE UK SMALL SACHS CAP BEST IDEAS FUND NOMINEES LIMITED LTD Gartmore Investment Limited 669,617 0.673% BNY GIL CLT LST GARTMORE SMALLER A/C NOMS COMPANIES TRUST PLC LTD A/C LST Gartmore Investment Limited 96,933 0.097% BNY GIL CLT 56640 GARTMORE GROWTH A/C NOMS OPPORTUNITIES PLC LTD A/C NWSC Gartmore Investment Limited 1,336853 1.344% NORTRUST 54550 STRATHCLYDE PENSION NOMINEES FUND LIMITED Gartmore Investment Limited 517,659 0.521% BNY GIL CLT 63076 GARTMORE GO C SHARE --------- -------- A/C NOMS POOL LTD A/C NWSC 8,702,651 9.160% --------- -------- 10,639,195 11.108% ========= ======== 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 information: All shares are held indirectly Email contact RDU@Gartmore.com 14. Contact name: Alison Averono 15. Contact telephone number: 0207 782 2324 This information is provided by RNS The company news service from the London Stock Exchange

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Iomart Group (IOM)
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