Bank of Ireland GP

Standard Form TR-1

NOTIFICATION OF MAJOR HOLDINGS (to be sent to the relevant issuer and to the Central Bank of Ireland)

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:
BANK OF IRELAND GROUP PLC
2. Reason for the notification (please tick the appropriate box or boxes): [X] An acquisition or disposal of voting rights [ ] An acquisition or disposal of financial instruments [ ] An event changing the breakdown of voting rights [ ] Other (please specify):
3. Details of person subject to the notification obligation:
Name: Massachusetts Financial Services Company	City and country of registered office (if applicable): Boston, US
4. Full name of shareholder(s) (if different from 3.): MFS invests in securities of the issuer on behalf of its various mutual funds and institutional account clients
5. Date on which the threshold was crossed or reached: 12 Dec 2025
6. Date on which issuer notified: 15 Dec 2025
7. Threshold(s) that is/are crossed or reached:

8. Total positions of person(s) subject to the notification obligation:
	% of voting rights attached to shares (total of 9.A)	% of voting rights through financial instruments (total of 9.B.1 + 9.B.2)	Total of both in % (9.A + 9.B)	Total number of voting rights of issuer
Resulting situation on the date on which threshold was crossed or reached	7.76%		7.76%	952,667,062
Position of previous notification (if applicable)	8.05%		8.05%

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

B 1: Financial Instruments according to Regulation 17(1)(a) of the Regulations
Type of financial instrument	Expiration date	Exercise/ Conversion Period	Number of voting rights that may be acquired if the instrument is exercised/converted	% of voting rights

		SUBTOTAL B.1

B 2: Financial Instruments with similar economic effect according to Regulation 17(1)(b) of the Regulations
Type of Expiration date Exercise/ Physical or Number of % of voting financial Conversion cash voting rights rights instrument Period settlement

			SUBTOTAL B.2

10. Information in relation to the person subject to the notification obligation (please tick the applicable box):
[ ] Person subject to the notification obligation is not controlled by any natural person or legal entity and does not control any other undertaking(s) holding directly or indirectly an interest in the (underlying) issuer.
[X] 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 entity:

Name	% of voting rights if it equals or is higher than the notifiable threshold	Total of both if it equals or is higher than the notifiable threshold
Massachusetts Financial Services Company	7.76%	7.76%
Massachusetts Financial Services Company	7.76%	7.76%
MFS Institutional Advisors, Inc.
Massachusetts Financial Services Company	7.76%	7.76%
MFS International Limited
MFS International Holdings Pty Ltd
MFS Investment Management Company (LUX) S.a r.l.
Massachusetts Financial Services Company	7.76%	7.76%
MFS Heritage Trust Company
Massachusetts Financial Services Company	7.76%	7.76%
MFS Institutional Advisors, Inc.
MFS Investment Management Canada Limited
Massachusetts Financial Services Company	7.76%	7.76%
MFS International Limited
MFS International Holdings Pty Ltd
MFS International (U.K.) Limited
Massachusetts Financial Services Company	7.76%	7.76%

MFS International Limited
MFS International Holdings Pty Ltd
MFS Investment Management K.K.

11. In case of proxy voting: [name of the proxy holder] will cease to hold [% and number] voting rights as of [date].

12. Additional information:

Done at Dublin on 16 December 2025 Contact Conor O'Leary, Head of Group Secretariat Tel +353 (0) 87 6597880