FORM 6-K

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                        Report of Foreign Private Issuer


                        Pursuant to Rule 13a-16 or 15d-16
                     of the Securities Exchange Act of 1934


                                  2 March 2005


                                    mmO2 plc


                                Wellington Street
                       Slough, Berkshire SL1 1YP, England

                    (Address of principal executive offices)


Indicate by check mark whether the registrant files or will file annual reports
under cover Form 20-F or Form 40-F

                         Form 20-F..X... Form 40-F.....


Indicate by check mark whether the registrant by furnishing the information
contained in this Form is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

                               Yes ..... No ..X...


If "Yes" is marked, indicate below the file number assigned to the registrant
in connection with Rule 12g3-2(b): 82 ________


Enclosure:

Copy of announcement regarding Director Shareholding sent to the London Stock
Exchange on 2 March 2005






                                  SCHEDULE 11

          NOTIFICATION OF INTERESTS OF DIRECTORS AND CONNECTED PERSONS

1. Name of company

mmO2 plc

2. Name of director

Rudolf Groeger

3. Please state whether notification indicates that it is in respect of holding
of the shareholder named in 2 above or 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 or in respect of a non-beneficial
interest

The person named in 2 above

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

The person named in 2 above

5. Please state whether notification relates to a person(s) connected with the
director named in 2 above and identify the connected person(s)

N/A

6. Please state the nature of the transaction. For PEP transactions please
indicate whether general/single co PEP and if discretionary/non discretionary

Exercise of options and sale of resulting shares under the mmO2 Share Option
Plan

7. Number of shares / amount of stock acquired

462,624 shares

8. Percentage of issued class

De minimis

9. Number of shares/amount of stock disposed

398,680 shares

10. Percentage of issued class

De minimis

11. Class of security

Ordinary shares of 0.1p each

12. Price per share

Options exercised at 87p each. Shares sold at 121.25p each.

13. Date of transaction

1 March 2005

14. Date company informed

1 March 2005

15. Total holding following this notification

63,944

16. Total percentage holding of issued class following this notification

De minimis

If a director has been granted options by the company please complete the
following boxes.

17. Date of grant



18. Period during which or date on which exercisable



19. Total amount paid (if any) for grant of the option



20. Description of shares or debentures involved: class, number



21. Exercise price (if fixed at time of grant) or indication that price is to be
fixed at time of exercise



22. Total number of shares or debentures over which options held following this
notification



23. Any additional information



24. Name of contact and telephone number for queries

Deborah Russell - 01753 628096

25. Name and signature of authorised company official responsible for making
this notification

Deborah Russell

Date of Notification

2 March 2005

The FSA does not give any express or implied warranty as to the accuracy of this
document or material and does not accept any liability for error or omission.
The FSA is not liable for any damages (including, without limitation, damages
for loss of business or loss of profits) arising in contract, tort or otherwise
from the use of or inability to use this document, or any material contained in
it, or from any action or decision taken as a result of using this document or
any such material.





                              SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.



                                                 mmO2 plc


Date: 2 March 2005                         By:___/s/ Robert Harwood___

                                           ROBERT HARWOOD
                                           Assistant Secretary