Holding(s) in Company

Pennon Group PLC
15 November 2007


PENNON GROUP PLC

FOR IMMEDIATE RELEASE

HOLDING IN COMPANY


NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which
voting rights are attached:

PENNON GROUP PLC

2. Reason for the notification

Change in the issued share capital

3. Full name of person(s) subject to the notification obligation

    AXA S.A., 25 Avenue Matignon, 75008 Paris and its group of companies

4. Full name of shareholder(s)

As at (3) above.

5. Date of the transaction (and date on which the threshold is crossed or
reached if different)

13 November 2007

6. Date on which issuer notified:

14 November 2007

7. Threshold(s) that is/are crossed or reached:



8. Notified details:



A: Voting rights attached to shares


Class/type of shares if possible              Situation previous to the Triggering transaction
using the ISIN CODE
                                  Number of shares                   Number of voting Rights

BI8V863                           20,933,953                               20,933,953



Resulting situation after the triggering transaction


Class/type of shares if      Number of shares          Number of voting rights (ix)  % of voting rights
possible using the ISIN CODE
                             Direct                    Direct (x)    Indirect (xi)   Direct      Indirect


 B18V863                     18,399,979                18,399,979    2,539,908       5.27        0.73



B: Financial Instruments

Resulting situation after the triggering transaction


Type of         Expiration Date       Exercise/Conversion       Number of voting rights     % of voting rights
financial       (xiii)                Period/ Date              that may be acquired if the
instrument                                                      instrument is exercised/
                                                                converted.



Total (A+B)
Number of voting rights        % of voting rights

20,939,887                     6.00%



9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable


Name of Company / Fund                      Number of Shares        % of issued share capital

AXA Sun Life plc                                 328,049                     0.09403
With Profits
                         Direct

AXA Sun Life plc                                5,488,326                    1.57317
Deferred Distribution Fund Life
                         Direct
AXA Sun Life plc                                7,371,003                    2.11282
Distribution Fund Life
                         Direct

AXA UK Investment Co ICVC                        50,000                      0.01433
Distribution Fund
                         Indirect

AXA UK Investment Co ICVC                        40,000                      0.01147
Extra Income Fund
                         Indirect

AXA UK Investment Co ICVC                       2,250,000                    0.64494
UK Equity Income Fund
                         Indirect

AXA UK Investment Co ICVC                        35,000                      0.01003
UK Growth Fund
                         Indirect

PPP Healthcare Group plc                         20,700                      0.00593
                         Direct

AXA Institutional                                20,000                      0.00573
Equity Focus
                         Direct

AXA Institutional                                60,000                      0.01720
Equity Fund
                         Direct

AXA Sun Life plc                                3,260,439                    0.93457
Retirement Distribution Pension
                         Direct

Sun Life Assurance Society Plc                   190,000                     0.05446
With Profit
                         Direct

AXA Insurance UK                                 123,602                     0.03543
Managed
                         Direct

AXA UK Group Pension Scheme                      23,000                      0.00659
                         Indirect

AXA General Unit Trust                           125,000                     0.03583
                         Indirect

Sun Life International (IOM) Ltd                 100,000                     0.02866
                         Direct

Sun Life Pensions Management Ltd                 12,658                      0.00363
                         Direct

Sun Life Pensions Management Ltd                  2,500                      0.00072
                         Direct

AXA Sun Life                                     87,608                      0.02511
LTAV UK Equity Life
                         Direct

AXA Sun Life                                     63,608                      0.01823
FTSE All Share Tracker Life
                         Direct

AXA Sun Life                                     393,782                     0.11287
LTAV UK Equity Pension
                         Direct

AXA Sun Life                                     304,990                     0.08742
FTSE All Share Tracker Pension
                         Direct

AXA Framlington onshore private client           16,908                      0.00485
                         Indirect

AXA Winterthur                                   190,166                     0.05451
                         Direct

AXA Sun Life with Profits Passive                235,861                     0.06761
                         Direct

Sun Life Ass Soc with Profit Passive             146,687                     0.04205
                         Direct


                             Total Direct     18,399,979                     5.27416
                             Total Indirect    2,539,908                     0.72804

                             TOTAL            20,939,887                     6.00219



Proxy Voting:



10. Name of the proxy holder:



N/A



11. Number of voting rights proxy holder will cease to hold:



    N/A



12. Date on which proxy holder will cease to hold voting rights:



    N/A



13. Additional information:



Annex to Notification of Major Interests In Shares



A: Identity of the person or legal entity subject to the notification obligation



Full name (including legal form for legal entities):

                Pennon Group Plc

Contact address (registered office for legal entities):

Peninsula House, Rydon Lane, Exeter, Devon, EX2 7HR

Contact name    Christopher Paul Richards - Interim Assistant Company Secretary

Phone number   01392 443060









15 November 2007



www.pennon-group.co.uk



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