Holding(s) in Company

Hiscox PLC
16 August 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

Fidelity International Limited (FIL) and its direct and indirect subsidiaries,
being non-beneficial holders.

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
Northern Trust London       FPM                     1,956,922             0.50
State Street Bank
and Trust Co London         FPM                     1,033,105             0.26
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                    22,699,563             5.78
JP Morgan, Bournemouth      FIL                       511,203             0.13
State Street Bank
and Trust Co London         FIL                       171,285             0.04
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

N/A

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

N/A

7. Number of shares / amount of stock disposed

1,062,100

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

0.27%

9. Class of security

Ordinary 5p shares

10. Date of transaction

Not disclosed

11. Date listed company informed

16 August 2006

12. Total holding following this notification

34,556,323

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)

8.79%

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 Fidelity
International Limited 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

S J Bridges, Company Secretary

Date of notification

13 February 2006


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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
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