Holding(s) in Company

Hiscox PLC
10 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)                                    61,874
Bank of Ireland (Dublin)                                               380,851
JP Morgan Chase                                                      4,085,150
Citibank                                                            47,879,093
HSBC Bank plc (London)                                                 146,499
Mellon Bank, Pittsburgh                                                348,971
State Street Trust & Banking Co (London)                             5,267,054
Northern Trust Company (London)                                        815,819

5. Number of shares / amount of stock acquired

30,000

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

Less than 0.01%

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

5 October 2006

11. Date listed company informed

9 October 2006

12. Total holding following this notification

58,985,311

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)

15.01%

14. Any additional information

N/A

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

10 October 2006

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