Holding(s) in Company

Hiscox PLC
30 November 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)                   635,794
JP Morgan Chase                          4,305,637
Vidacos                                 47,513,403
HSBC Bank plc (London)                     135,219
Mellon Bank, Pittsburgh                    308,804
State Street Trust & Banking Co (London) 5,267,054
Northern Trust Company (London)            816,519
                                        ----------
                                        59,038,117
                                        ----------

5. Number of shares / amount of stock acquired

Date of transaction        No. Shares    Remarks
28-Nov 2006                254,943       In specie transfer in
29-Nov 2006                100,000       Purchase
                          --------
                           354,943
                          --------

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

0.09%

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

As 5

11. Date listed company informed

30 November 2006

12. Total holding following this notification

59,038,117

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

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

30 November 2006

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