Holding(s) in Company

Hiscox PLC
24 January 2006


                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Name of listed company

Hiscox plc

2. Name of shareholder having a major interest

Aviva plc and its subsidiaries

3. Please state whether notification indicates that it is regarding the holding
of the shareholder named in 2 above; in respect of a nonbeneficial 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

Morley Fund Management Ltd:
  BNY Norwich Union Nominees Ltd     2,932,637 *
  Chase GA Group Nominees Ltd        6,037,376 *
  Chase Nominees Ltd                   517,112 *
  CUIM Nominee Ltd                   2,121,041 *

*denotes beneficial interest

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

225,000

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

0.06%

9. Class of security

Ordinary 5p shares

10. Date of transaction

23 January 2006

11. Date listed company informed

24 January 2006

12. Total holding following this notification

11,608,166*

*beneficial interest only

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)

2.96%

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

24 January 2006

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