TR-1: Standard form for notification of major holdings

1. Issuer Details

ISIN

GB0003452173

Issuer Name

FIRSTGROUP PLC

UK or Non-UK Issuer

UK

2. Reason for Notification

An acquisition or disposal of voting rights

3. Details of person subject to the notification obligation

Name

Dimensional Fund Advisors LP

City of registered office (if applicable)

Austin

Country of registered office (if applicable)

USA

4. Details of the shareholder

+---------------------------+----------+----------------------------+
|Name                       |City of   |Country of registered office|
|                           |registered|                            |
|                           |office    |                            |
+---------------------------+----------+----------------------------+
|The shares are held by one |          |                            |
|or more nominees/custodians|          |                            |
+---------------------------+----------+----------------------------+

5. Date on which the threshold was crossed or reached

28-May-2026

6. Date on which Issuer notified

29-May-2026

7. Total positions of person(s) subject to the notification obligation

+----------------+-----------+------------------+--------+-----------+
|.               |% of voting|% of voting rights|Total of|Total      |
|                |rights     |through financial |both    |number of  |
|                |attached to|instruments (total|in %    |voting     |
|                |shares     |of 8.B 1 + 8.B 2) |(8.A +  |rights held|
|                |(total     |                  |8.B)    |in issuer  |
|                |of 8.A)    |                  |        |           |
+----------------+-----------+------------------+--------+-----------+
|Resulting       |5.007000   |0.000000          |5.007000|28167366   |
|situation on the|           |                  |        |           |
|date on         |           |                  |        |           |
|which threshold |           |                  |        |           |
|was crossed or  |           |                  |        |           |
|reached         |           |                  |        |           |
+----------------+-----------+------------------+--------+-----------+
|Position of     |4.976178   |0.000000          |4.976178|           |
|previous        |           |                  |        |           |
|notification    |           |                  |        |           |
|(if applicable) |           |                  |        |           |
+----------------+-----------+------------------+--------+-----------+

8. Notified details of the resulting situation on the date on which the
threshold was crossed or reached

8A. Voting rights attached to shares

+------------+----------------+------------------+-------------+-------------+
|Class/Type  |Number of direct|Number of indirect|% of direct  |% of indirect|
|of shares   |voting rights   |voting rights     |voting rights|voting rights|
|ISIN code(if|(DTR5.1)        |(DTR5.2.1)        |(DTR5.1)     |(DTR5.2.1)   |
|possible)   |                |                  |             |             |
+------------+----------------+------------------+-------------+-------------+
|GB0003452173|                |28167366          |             |5.007000     |
+------------+----------------+------------------+-------------+-------------+
|Sub Total   |28167366                           |5.007000%                  |
|8.A         |                                   |                           |
+------------+----------------+------------------+-------------+-------------+

8B1. Financial Instruments according to (DTR5.3.1R.(1) (a))

+----------+----------+---------+-----------------------------------+------+
|Type of   |Expiration|Exercise/|Number of voting rights that may be|% of  |
|financial |date      |conve    |acquired if the instrument is      |voting|
|instrument|          |rsion    |exercised/converted                |rights|
|          |          |period   |                                   |      |
+----------+----------+---------+-----------------------------------+------+
|          |          |         |                                   |      |
+----------+----------+---------+-----------------------------------+------+
|Sub Total |                    |                                   |      |
|8.B1      |                    |                                   |      |
+----------+----------+---------+-----------------------------------+------+

8B2. Financial Instruments with similar economic effect according to
(DTR5.3.1R.(1) (b))

+--------------+----------+--------------+-----------+---------+------+
|Type of       |Expiration|Exercise/conve|Physical or|Number of|% of  |
|financial     |date      |rsion period  |cash       |voting   |voting|
|instrument    |          |              |settlement |rights   |rights|
+--------------+----------+--------------+-----------+---------+------+
|              |          |              |           |         |      |
+--------------+----------+--------------+-----------+---------+------+
|Sub Total 8.B2|                                     |         |      |
+--------------+----------+--------------+-----------+---------+------+

9. Information in relation to the person subject to the notification obligation

2. Full chain of controlled undertakings through which the voting rights and/or
the financial instruments are effectively held starting with the ultimate
controlling natural person or legal entities (please add additional rows as
necessary)

+-----------+-----------+------------------+-----------+----------------+
|Ultimate   |Name of    |% of voting rights|% of voting|Total of both if|
|controlling|controlled |if it equals or is|rights     |it equals or is |
|person     |undertaking|higher than the   |through    |higher than the |
|           |           |notifiable        |financial  |notifiable      |
|           |           |threshold         |instruments|threshold       |
|           |           |                  |if it      |                |
|           |           |                  |equals or  |                |
|           |           |                  |is higher  |                |
|           |           |                  |than the   |                |
|           |           |                  |notifiable |                |
|           |           |                  |threshold  |                |
+-----------+-----------+------------------+-----------+----------------+
|Dimensional|i)         |                  |           |                |
|Holdings   |Dimensional|                  |           |                |
|Inc.       |Fund       |                  |           |                |
|           |Advisors   |                  |           |                |
|           |Ltd., (ii) |                  |           |                |
|           |DFA        |                  |           |                |
|           |Australia  |                  |           |                |
|           |Limited    |                  |           |                |
|           |(iii)      |                  |           |                |
|           |Dimensional|                  |           |                |
|           |Ireland    |                  |           |                |
|           |Limited    |                  |           |                |
|           |(iv)       |                  |           |                |
|           |Dimensional|                  |           |                |
|           |Fund       |                  |           |                |
|           |Advisors   |                  |           |                |
|           |Canada ULC |                  |           |                |
|           |(v)        |                  |           |                |
|           |Dimensional|                  |           |                |
|           |Fund       |                  |           |                |
|           |Advisors   |                  |           |                |
|           |Pte. Ltd.  |                  |           |                |
|           |and (vi)   |                  |           |                |
|           |Dimensional|                  |           |                |
|           |Fund       |                  |           |                |
|           |Advisors LP|                  |           |                |
+-----------+-----------+------------------+-----------+----------------+

10. In case of proxy voting

Name of the proxy holder

The number and % of voting rights held

The date until which the voting rights will be held

11. Additional Information

The ordinary shares are held in segregated accounts and funds (together, the
"Accounts") managed on a discretionary basis by Dimensional Fund Advisors LP and
its subsidiary undertakings i) Dimensional Fund Advisors Ltd., (ii) DFA
Australia Limited (iii) Dimensional Ireland Limited (iv) Dimensional Fund
Advisors Canada ULC and (v) Dimensional Fund Advisors Pte. Ltd.
Dimensional Fund Advisors LP is controlled by its general partner, Dimensional
Holdings Inc.
Dimensional Fund Advisors LP, on behalf of itself and its subsidiary
undertakings, expressly disclaims beneficial ownership of the shares held in the
Accounts.
To note, as of 28 May 2026, Dimensional Fund Advisors LP also had investment
management discretion over an additional 135,179 shares held by the Accounts
where the voting rights are not controlled by Dimensional Fund Advisors LP or
its subsidiary undertakings.

12. Date of Completion

29-May-2026

13. Place Of Completion

Paris


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