Holding(s) in Company

London Stock Exchange Group PLC
11 September 2007

TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES



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



London Stock Exchange Group plc



2. Reason for the notification (please state Yes/No):



An acquisition or disposal of voting rights: (N)



An acquisition or disposal of financial instruments which may result in the
acquisition of shares already issued to which voting rights are attached: (N)



An event changing the breakdown of voting rights: (N)



Other (please specify): (Y) Acquisition of over 14%



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



Kinetics Asset Management Inc.
Horizon Asset Management Inc.



4. Full name of shareholder(s) (if different from 3.) (iv):



N/A



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



N/A



6. Date on which issuer notified:



10 September 2007



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



14%



8. Notified details:



A: Voting rights attached to shares


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


LSE.LN                             28,026,038                         28,026,038
GB00B0SWJX34





Resulting situation after the triggering transaction (vii)


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


 LSE.LN                       28,357,038               28,357,038   N/A                  14.16%      N/A
GB00B0SWJX34



B: Financial Instruments

Resulting situation after the triggering transaction (xii)


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








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


28,357,038                       14.16%



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



N/A



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:



Horizon Asset Management and Kinetics Asset Management are separate legal
entities, with different shareholders and directors, for the most part.
However, since Horizon Asset Management and Kinetics derive most of their
investment research from a common source, (i.e., the Horizon Research Group), a
division of Horizon Asset Management, Inc., and because of certain shared
personnel and office space, the Panel Executive has deemed Horizon Asset
Management and Kinetics Asset Management to be a single person for the purposes
of Rule 8.3 (b) of the City Code on Takeovers and Mergers. As such, this and
future filings treat the entities as one company, however, both Horizon and
Kinetics maintain that they are two separate and distinct companies.



14. Name of contact and telephone number for queries



Jay Kesslen 914-703-6900



15. Name and signature of duly authorised officer of the listed company
responsible for making this notification



Lisa Condron, Company Secretary


16. Date of notification



11 September 2007




Notes to the Forms

(i) This form is to be sent to the issuer or underlying issuer and to be filed
with the competent authority.

(ii) Either the full name of the legal entity or another method for identifying
the issuer or underlying issuer, provided it is reliable and accurate.

(iii) This should be the full name of (a) the shareholder; (b) the person
acquiring, disposing of or exercising voting rights in the cases provided for in
DTR5.2.1 (b) to (h); (c) all the parties to the agreement referred to in
DTR5.2.1 (a), or (d) the direct or indirect holder of financial instruments
entitled to acquire shares already issued to which voting rights are attached,
as appropriate.

In relation to the transactions referred to in points DTR5.2.1 (b) to (h), the
following list is provided as indication of the persons who should be mentioned:

- in the circumstances foreseen in  DTR5.2.1 (b), the person that acquires the
voting rights and is entitled to exercise them under the agreement and the
natural person or legal entity who is transferring temporarily for consideration
the voting rights;

- in the circumstances foreseen in DTR 5.2.1 (c), the person holding the
collateral, provided the person or entity controls the voting rights and
declares its intention of exercising them, and person lodging the collateral
under these conditions;

- in the circumstances foreseen in DTR5.2.1(d), the person who has a life
interest in shares if that person is entitled to exercise the voting rights
attached to the shares and the person who is disposing of the voting rights when
the life interest is created;

- in the circumstances foreseen in DTR5.2.1 (e), the parent undertaking and,
provided it has a notification duty at an individual level under DTR 5.1, under
DTR5.2.1 (a) to (d) or under a combination of any of those situations, the
controlled undertaking;

- in the circumstances foreseen in DTR5.2.1 (f), the deposit taker of the
shares, if he can exercise the voting rights attached to the shares deposited
with him at his discretion, and the depositor of the shares allowing the deposit
taker to exercise the voting rights at his discretion;

- in the circumstances foreseen in DTR5.2.1 (g), the person  that controls the
voting rights;

- in the circumstances foreseen in DTR5.2.1 (h), the proxy holder, if he can
exercise the voting rights at his discretion, and the shareholder who has given
his proxy to the proxy holder allowing the latter to exercise the voting rights
at his discretion.

(iv) Applicable in the cases provided for in DTR 5.2.1 (b) to (h). This should
be the full name of the shareholder who is the counterparty to the natural
person or legal entity referred to in DTR5.2.

(v) The date of the transaction should normally be, in the case of an on
exchange transaction, the date on which the matching of orders occurs; in the
case of an off exchange transaction, date of the entering into an agreement.

The date on which threshold is crossed should normally be the date on which the
acquisition, disposal or possibility to exercise voting rights takes effect (see
DTR 5.1.1R (3)). For passive crossings, the date when the corporate event took
effect.

(vi) Please refer to the situation disclosed in the previous notification. In
case the situation previous to the triggering transaction was below 3%, please
state 'below 3%'.

(vii)  If the holding has fallen below the minimum threshold, the notifying
party should not be obliged to disclose the extent of the holding, only that the
new holding is less than 3%.

For the case provided for in DTR5.2.1(a), there should be no disclosure of
individual holdings per party to the agreement unless a party individually
crosses or reaches an Article 9 threshold. This applies upon entering into,
introducing changes to or terminating an agreement.

(viii) Direct and indirect

(ix)  In case of combined holdings of shares with voting rights attached 'direct
holding' and voting rights 'indirect holdings', please split the voting rights
number and percentage into the direct and indirect columns-if there is no
combined holdings, please leave the relevant box blank.

(x)  Voting rights to shares in respect of which the notifying party is a direct
shareholder  (DTR 5.1)

(xi) Voting rights held by the notifying party as an indirect shareholder (DTR
5.2.1)

(xii)  If the holding has fallen below the minimum threshold, the notifying
party should not be obliged to disclose the extent of the holding, only that the
new holding is below 3%.

(xiii)  date of maturity / expiration of the finical instrument i.e. the date
when the right to acquire shares ends.

(xiv)  If the financial instrument has such a period-please specify the period-
for example once every three months starting from the (date)

(xv) The notification should include the name(s) of the controlled undertakings
through which the voting rights are held. The notification should also include
the amount of voting rights and the percentage held by each controlled
undertaking, insofar as individually the controlled undertaking holds 5% or
more, and insofar as the notification by the parent undertaking is intended to
cover the notification obligations of the controlled undertaking.

(xvi ) This annex is only to be filed with the competent authority.

(xvii) Whenever another person makes the notification on behalf of the
shareholder or the natural person/legal entity referred to in DTR5.2 and DTR5.3


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