REG-Serco Group PLC: Holding(s) in Company

For filings with the FSA include the annex
For filings with issuer exclude the annex

TR-1: Notifications of Major Interests in Shares

1. Identity of the issuer or the underlying issuer of existing
shares to which voting rights are attached:

Serco Group plc

2. Reason for notification [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

An event changing the breakdown of voting rights

Other (please specify):

3. Full name of person(s) subject to Ignis Investment Services Limted
notification
obligation:

4. Full name of shareholder(s) (if
different from 3):

5. Date of transaction (and date on 17 April 2009
which the
threshold is crossed or reached if
different):

6. Date on which issuer notified: 20 April 2009

7. Threshold(s) that is/are crossed or 3%
reached:

8: Notified Details

A: Voting rights attached to shares

Class/type of Situation previous to Resulting situation after
shares the triggering the triggering transaction
transaction

If possible Number of Number of Number Number of Percentage of
use shares voting of voting rights voting rights
ISIN code rights shares

Direct Indirect Direct Indirect

GB0007973794 14,978,561 3.07

B: Financial Instruments

Resulting situation after the triggering transaction

Type of Expiration Exercise/ No. of voting Percentage of
financial date conversion rights that may be voting rights
instrument period/date acquired (if the
instrument
exercised/
converted)

Total (A+B)

Number of voting rights Percentage of voting rights

14,978,561 3.07

9. Chain of controlled undertakings through which the voting rights and /or the
financial instruments are effectively held, if applicable:

Pearl Group Limited

Impala Holdings Limited

Pearl Group Holdings (No.1) Ltd

Ignis Asset Management Ltd

Ignis Investment Services Ltd (indirect)

BNY (OCS) Nominees Ltd (2,006,683 0.41%)

VIDACOS Nominees Ltd (10,900,513 2.24%)

MELLON Bank na (935,441 0.19%)

Nortrust Nominees Ltd (499,487 0.10%)

State Street Nominees (636,437 0.13%)

Proxy Voting:

10. Name of proxy holder: n/a

11. Number of voting rights proxy n/a
holder will cease to hold:

12. Date on which proxy holder will n/a
cease to hold voting rights:

13. Additional information: Serco Group plc is disclosing this
information in accordance with DTR 5.8.12

14 Contact name: Sarah Howfield, Company Secretarial
Assistant

15. Contact telephone name: 01256 744272

For notes on how to complete form TR-1 please see the FSA website.

Note: Annex should only be submitted to the FSA not the issuer

Annex: Notification of major interests in shares

A: Identity of the persons or legal entity subject to the notification
obligation

Full name
(including legal form of legal
entities)

Contact address
(registered office for legal
entities)

Phone number & email

Other useful information
(at least legal representative
for legal persons)

B: Identity of the notifier, if applicable

Full name

Contact address

Phone number & email

Other useful information

(e.g. functional relationship
with the
person or legal entity subject
to the
notification obligation)

C: Additional information

END