G4S plc UK : G4S plc UK : Holding(s) in Company

               G4S plc UK : G4S plc UK : Holding(s) in Company

For filings with the FSA 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 shares to which voting rights are                       G4S plc
attached:^ii
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
result in the acquisition of shares already issued to which voting
rights are attached
An acquisition or disposal of instruments with similar economic effect
to qualifying 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 on
which the threshold is crossed or                      21^st March 2013
reached:^v
6. Date on which issuer notified:                      25^th March 2013
7. Threshold(s) that is/are crossed or             Holding has gone above 5%
reached: ^vi, vii

8. Notified details:
A: Voting rights attached to shares^viii, ix
Class/type of  Situation previous        Resulting situation after the triggering
shares         to the triggering         transaction
               transaction
if possible    Number       Number       Number   Number of voting  % of voting
using          of           of           of       rights            rights ^x
the ISIN CODE  Shares       Voting       shares
                            Rights       Direct   Direct Indirect   Direct   Indirect
                                                  ^xi    ^xii
GB00B01FLG62   N/A          N/A          N/A      N/A    64,596,385 N/A      4.58%
B: Qualifying Financial Instruments
Resulting situation after the triggering transaction
Type of financial    Expiration    Exercise/          Number of voting    % of voting
instrument           date ^xiii    Conversion Period  rights that may be  rights
                                   ^xiv               acquired if the
                                                      instrument is
                                                      exercised/
                                                      converted.
C: Financial Instruments with similar economic effect to Qualifying Financial
Instruments ^xv, xvi
Resulting situation after the triggering transaction
Type of         Exercise    Expiration Exercise/  Number of voting     % of voting
financial       price       date ^xvii Conversion rights instrument    rights ^xix,
instrument                             period     refers to            xx
                                       ^xviii
CFD                                               6,096,495            Nominal Delta
                                                                       0.43%   0.43%
Total (A+B+C)
Number of voting rights                       Percentage of voting rights
70,692,880                                    5.01%

9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable: ^xxi
BlackRock Investment Management (UK) Limited - 70,692,880 (5.01%)
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:
14. Contact name:                           Peter David, Company Secretary
15. Contact telephone number:               + 44(0)1293 554584

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Source: G4S plc UK via Thomson Reuters ONE
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