Bank of Ireland GP

Major Shareholding Notification • Sep 10, 2025

Standard Form TR-1

Standard form for notification of major holdings

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: Wellington Management Group LLP City and country of registered office (if applicable): c/o Wellington Management Company LLP, 280 Congress Street, Boston, MA 02210 USA 4. Full name of shareholder(s) (if different from 3.): BNY Custodial Nominees (Ireland) Limited Brown Brothers Harriman Chase Nominees Ltd. Citibank NA Morgan Nominees Limited Nortrust Nominees Limited ROY Nominees Limited State Street Nominees Ltd. USBK William Blair Wellington 5. Date on which the threshold was crossed or reached: 09 Sep 2025 6. Date on which issuer notified: 10 Sep 2025 7. Threshold(s) that is/are crossed or reached: 3%

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	3.00%	0.01%	3.01%	958,001,534
Position of previous notification (if applicable)	2.99%	0.01%	3.00%

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

A: Voting rights attached to shares Class/type of shares ISIN code (if possible) Number of voting rights % of voting rights Direct Indirect Direct Indirect IE00BD1RP616 Common Stock 28,754,536 3.00% SUBTOTAL A 28,754,536 3.00%

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 financial instrument Expiration date Exercise/ Conversion Period Physical or cash settlement Number of voting rights % of voting rights Equity Swap 20 May 2033 20 May 2033 Cash settlement 40,116 Equity Swap shares or 40,116 votes on a converted basis 0.00% Equity Swap 05 May 2028 05 May 2028 Cash settlement 12,811 Equity Swap shares or 12,811 0.00%

		votes on a converted basis
	SUBTOTAL B.2	52,927	0.01%

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	% of voting rights through financial instruments if it equals or is higher than the notifiable threshold	Total of both if it equals or is higher than the notifiable threshold
Wellington Management Group LLP	3.00%		3.01%
Wellington Group Holdings LLP	3.00%		3.01%
Wellington Investment Advisors Holdings LLP	3.00%		3.01%
Wellington Management Global Holdings, Ltd.
Wellington Management International Ltd
Wellington Management Group LLP	3.00%		3.01%
Wellington Group Holdings LLP	3.00%		3.01%
Wellington Investment Advisors Holdings LLP	3.00%		3.01%
Wellington Management Company LLP

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 10 September 2025 Contact Conor O'Leary, Head of Group Secretariat Tel +353 (0) 87 6597880