Holding(s) in Company

Hiscox PLC
11 July 2006

                    NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Name of listed company

Hiscox plc


2. Name of shareholder having a major interest

(a)   FMR Corp, parent holding company of Fidelity Management & Research Company
(FMRCO), investment manager for US mutual funds, and Fidelity Management Trust
Company (FMTC), a US state chartered bank which acts as a trustee or investment
manager of various pension and trust accounts.

(b)   Fidelity International Limited (FIL), parent holding company for various
direct and indirect subsidiaries, including Fidelity Investment Services Ltd
(FISL), Fidelity Gestion (FIGEST), Fidelity Investments Advisory (Korea) Limited
(FIA(K)L), Fidelity Investments Management (Hong Kong) Limited (FIMHK), Fidelity
Pension Management (FPM), and Fidelity Investments International (FII),
investment managers for various non-US investment companies and institutional
clients.

(c)   The notifiable interests also comprise the notifiable interest of Mr
Edward C Johnson 3rd, a principal shareholder of FMR Corp. and Fidelity
International Limited.


3. Please state whether notification indicates that it is regarding the holding
of the shareholder named in 2 above; in respect of a non-beneficial interest; or
in the case of an individual holder if it is a holding of that person's spouse
or children under the age of 18

As 2


4. Name of the registered holder(s) and, if more than one holder, the number of
shares held by each of them

Registered Holder                   Management   No. Shares Held  Percentage of
                                     Company                        capital (%)
JP Morgan, Bournemouth                 FPM           4,034,793           1.03
State Street Bank and Trust Co,        FPM           2,088,205           0.53
London
Northern Trust, London                 FPM           1,956,922           0.50
Citibank London                        FPM             509,302           0.13
HSBC Bank plc                          FPM             443,383           0.11
Bank of New York, Brussels             FPM             161,771           0.04
JP Morgan, Bournemouth                 FISL         22,673,463           5.77
JP Morgan, Bournemouth                 FIL             534,403           0.14
State Street Bank and Trust Co,        FIL             181,185           0.05
London
Bank of New York Europe, London        FII           1,850,465           0.47
JP Morgan, Bournemouth                 FII           1,184,531           0.30


5. Number of shares / amount of stock acquired

2,102,972


6. Percentage of issued class (any treasury shares held by the listed company
should not be taken into account when calculating percentage)

0.54%


7. Number of shares / amount of stock disposed

N/A


8. Percentage of issued class (any treasury shares held by the listed company
should not be taken into account when calculating percentage)

N/A


9. Class of security

Ordinary 5p shares


10. Date of transaction

Not disclosed


11. Date listed company informed

7 July 2006


12. Total holding following this notification

35,618,423


13. Total percentage holding of issued class following this notification (any
treasury shares held by the listed company should not be taken into account when
calculating percentage)

9.06%


14. Any additional information

The notifiable interests include interest held on behalf of authorised unit
trust schemes in the U.K., notwithstanding the exemption from reporting pursuant
to section 209(1)(h) of the Companies Act 1985.
These notifications of disclosable interests constitute separate notifications
of interest in the shares and are combined solely for the purposes of clarity
and efficiency. Nothing herein should be taken to indicate that FMR Corp. and
its direct and indirect subsidiaries or Mr Edward C Johnson 3rd act as a group
or in concert in respect of the disclosed interests, or that they are required
to submit these notifications on a joint basis.
The disclosable interests arise under section 208(4)(b) of the Act, namely where
a person, not being the registered holder, is entitled to exercise a right
conferred by the holding of the shares or to control the exercise of such
rights, or under section 203 of the Act respectively.


15. Name of contact and telephone number for queries

David Taylor, 020 7448 6791


16. Name and signature of duly authorised officer of the listed company
responsible for making this notification

SJ Bridges, Company Secretary

Date of notification

11 July 2006


The FSA does not give any express or implied warranty as to the accuracy of this
document or material and does not accept any liability for error or omission.
The FSA is not liable for any damages (including, without limitation, damages
for loss of business or loss of profits) arising in contract, tort or otherwise
from the use of or inability to use this document, or any material contained in
it, or from any action or decision taken as a result of using this document or
any such material.




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