Holding(s) in Company

Hiscox PLC
24 October 2006


                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Name of listed company

Hiscox plc

2. Name of shareholder having a major interest

Amvescap plc

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

Amvescap plc and subsidiary companies on behalf of discretionary clients

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

Brown Brothers Harriman (New Jersey)           55,687
Bank of Ireland (Dublin)                      380,851
JP Morgan Chase                             4,060,981
Vidacos                                    48,194,605
HSBC Bank plc (London)                        146,499
Mellon Bank, Pittsburgh                       348,971
State Street Trust & Banking Co (London)    5,267,054
Northern Trust Company (London)               816,519
                                          -----------
                                           59,271,167
                                          -----------

5. Number of shares / amount of stock acquired

323,250

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

0.08%

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

20 October 2006

11. Date listed company informed

23 October 2006

12. Total holding following this notification

59,271,167

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)

15.08%

14. Any additional information

None of these shares are beneficially owned by Amvescap. Subsidiary companies of
Amvescap have a large number of portfolio management clients for whom they act
as investment manager and investment advisor and by virtue of Section 203 of the
Companies Act 1985 Amvescap is deemed to have the same interest in the shares.

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

24 October 2006

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for loss of business or loss of profits) arising in contract, tort or otherwise
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