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THIS DOCUMENT IS FOR INFORMATION PURPOSES ONLY AND IS NOT AN OFFER OF SECURITIES IN ANY JURISDICTION

11 June 2026

TIRLÁN CO-OPERATIVE SOCIETY LIMITED ANNOUNCES A SECONDARY PLACING AND PARTICIPATION IN A DIRECTED BUYBACK REPRESENTING IN AGGREGATE APPROXIMATELY 5.0% OF GLANBIA PLC'S SHARE CAPITAL

Tirlán Co-Operative Society Limited ("Tirlán") announces its intention to sell up to an aggregate 12,000,000 ordinary shares in Glanbia plc ("Glanbia") by way of a private placement to institutional investors by way of an accelerated bookbuild offering (the "Equity Placement") and to Glanbia as part of a directed buyback for up to €50.0m (the "Off-Market Purchase"). The Equity Placement will be launched immediately following this announcement.

Goodbody Stockbrokers UC ("Goodbody") and Coöperatieve Rabobank U.A. in cooperation with Kepler Cheuvreux S.A. ("Rabobank-Kepler Cheuvreux") are acting as joint global coordinators and joint bookrunners in connection with the Equity Placement (Goodbody and Rabobank-Kepler Cheuvreux together the "Joint Global Coordinators").

The final number of shares placed under the Equity Placement (the "Equity Placement Shares") and the price at which the Equity Placement Shares are to be placed will be agreed by the Joint Global Coordinators and Tirlán at the close of the bookbuild process, and the results of the Equity Placement will be announced as soon as practicable thereafter. The timings for the close of the bookbuild process are at the absolute discretion of the Joint Global Coordinators. Settlement of the Equity Placement is expected to take place on or about 16 June 2026.

In conjunction with and conditional upon the Equity Placement, Glanbia has agreed with Tirlán to make an off-market purchase for up to €50.0m of ordinary shares in the capital of Glanbia at a price equivalent to the Equity Placement price, as determined through the bookbuilding process (the "Equity Placement Price"). Accordingly, the respective numbers of ordinary shares to be sold by Tirlán pursuant to the Off‑Market Purchase and, consequently, the Equity Placement will be determined by reference to the Equity Placement Price. The Off-Market Purchase is expected to settle on or about 16 June 2026, the same day as settlement of the Equity Placement.

A share purchase agreement (the "Directed Buyback Contract") between Glanbia and Tirlán was approved by the shareholders of Glanbia at the Annual General Meeting held on 29 April 2026 and signed on 5 June 2026. Glanbia intends to cancel ordinary shares purchased under the Directed Buyback Contract.

Tirlán has agreed to a lock-up in respect of the sale of its shares in the Company ending 90 days after the settlement date of the Equity Placement, other than an off-market purchase under the Directed Buyback Contract or by waiver by the Joint Global Coordinators.

The Equity Placement Shares will be offered to institutional investors only. The Equity Placement Shares have not been and will not be registered under the U.S. Securities Act of 1933, as amended (the "Securities Act") or under the securities laws of any state or other jurisdiction of the United States. The Equity Placement Shares will be offered and sold outside the United States in compliance with Regulation S under the Securities Act ("Regulation S") and may be offered in the United States solely to qualified institutional buyers ("QIBs"), as defined in Rule 144A under the Securities Act, pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act. There will be no offers or sales to investors in Australia, South Africa, Canada (except to "Accredited Investors" and "Permitted Clients", as defined below, in relation to the Equity Placement) or Japan or any other jurisdiction in which offers or sales would be prohibited by applicable law.

Enquiries:

IMPORTANCE NOTICE

This announcement does not constitute an offer to sell or issue or a solicitation of an offer to purchase, subscribe for or otherwise acquire the Equity Placement Shares in the United States or any other jurisdiction in which such offer or sale would be unlawful. The Equity Placement Shares have not been and will not be registered under the Securities Act or the laws of any state or other jurisdiction of the United States, and may not be offered or sold in the United States or to or for the account or benefit of any U.S. Persons (as defined below), except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and in compliance with any applicable securities laws of any state or other jurisdiction of the United States. The Equity Placement Shares will be offered and sold outside the United States in compliance with Regulation S and may be offered in the United States solely to QIBs pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act. This announcement may not be distributed or sent into the United States, or in any other jurisdiction in which offers or sales of the Equity Placement Shares described herein would be prohibited by applicable laws and should not be distributed to publications with a general circulation in the United States. There has been and will be no public offering of the Equity Placement Shares in the United States.

No prospectus or other offering document has been or will be submitted to any regulatory authority in relation to the Equity Placement and the commitments of investors or placees procured by the Joint Global Coordinators will be made solely on the basis of publicly-available information. No action has been taken by any person that would permit an offering of the Equity Placement Shares or the distribution of any offering material relating to the Equity Placement Shares in any jurisdiction where action for that purpose is required. Accordingly, the Equity Placement Shares are not being and may not be offered, sold, resold or delivered, directly or indirectly, in or into any such jurisdiction. This announcement has been provided for your information and is subject to amendment. Neither this announcement nor anything contained herein, shall form the basis of, or be relied on in connection with, any contract to purchase or subscribe for any securities, nor shall it or any part of it form the basis of or be relied on in connection with any contract or commitment whatsoever.

This is not an offer to sell, nor a solicitation of an offer to buy and any discussions, negotiations or other communications that may be entered into, whether in connection with the terms set out herein or otherwise, shall be conducted subject to contract.

The information in this announcement does not purport to be comprehensive and has not been independently verified by the Joint Global Coordinators, any of their respective group undertakings or affiliates or any of their respective members, directors, officers, employees, agents or affiliates. No representation or warranty, express or implied, is or will be made as to, or in relation to, and no responsibility or liability is or will be accepted by any Joint Global Coordinators or by any of their respective members, directors, officers, employees, agents or affiliates as to or in relation to the accuracy, completeness, correctness or sufficiency of this announcement, or any other written or oral information made available to any interested party or its advisers and any liability therefore is hereby expressly disclaimed. The information contained in this announcement is subject to change without notice and may not contain all material information relating to the products, investment and transaction referred to herein. None of Tirlán, the Joint Global Coordinators nor any of their respective group undertakings or affiliates give any undertaking to provide the recipient with access to any additional information or to update this announcement or any additional information or to correct any inaccuracies in it which may become apparent, and it reserves the right, without giving reasons, at any time and in any respect to amend or terminate the proposals described herein.

Any prospective investor in the Equity Placement Shares referred to in this announcement should proceed on the assumption that it must bear the economic risk of an investment in the Equity Placement Shares. None of Tirlán, the Company or the Joint Global Coordinators makes any representation as to (i) the suitability of the Equity Placement Shares for any particular investor, (ii) the appropriate accounting treatment and potential tax consequences of investing in the Equity Placement Shares or (iii) the future performance of the Equity Placement Shares either in absolute terms or relative to competing investments.

Copies of this announcement are not being, and must not be, mailed, or otherwise forwarded, distributed or sent in, into or from the United States (or to or for the account of U.S. Persons), except unless to or from a QIB, or any other jurisdiction in which such mailing would be illegal, or to publications with a general circulation in those jurisdictions, and persons receiving this announcement (including custodians, nominees and trustees) must not mail or otherwise forward, distribute or send it in, into or from the United States (or to U.S. Persons), except unless to or from a QIB, or any other jurisdiction in which such mailing would be illegal or to publications with a general circulation in those jurisdictions.

Each of Goodbody Stockbrokers UC and Coöperatieve Rabobank U.A. in cooperation with Kepler Cheuvreux S.A. is acting exclusively for Tirlán in connection with the Equity Placement and no one else and will not be responsible to anyone other than Tirlán for providing the protections afforded to its clients nor for giving advice in relation to the Equity Placement or any other matter referred to herein.

Goodbody Stockbrokers UC, trading as Goodbody, is regulated by the Central Bank of Ireland. In the UK, Goodbody is also subject to regulation by the Financial Conduct Authority. Goodbody is a member of the group of companies headed by AIB Group plc.

Coöperatieve Rabobank U.A. has its statutory seat in Amsterdam and is registered with the Dutch Chamber Of Commerce under number 30046259. Coöperatieve Rabobank U.A. is authorised by the Dutch Central Bank (De Nederlandsche Bank), regulated by the Netherlands Authority for the Financial Markets (Authoriteit Financiële Markten, AFM) and subject to limited regulation in the United Kingdom by the Financial Conduct Authority and Prudential Regulation Authority in respect of its UK activities.

Potential investors who are in any doubt about the contents of this announcement should consult their stockbroker, bank manager, solicitor, accountant or other financial adviser. It should be remembered that the price of securities and the income from them can go down as well as up.

EEA Restrictions and Deemed Investor Representations

This announcement, as it relates to the Equity Placement, and the Equity Placement when made, are only addressed to, and directed in, member states of the European Economic Area (the "EEA") (each, a "Member State"), at persons who are "qualified investors" within the meaning of Regulation 2017/1129, as amended (the "EU Prospectus Regulation") ("EEA Qualified Investors"). Each person in a Member State who initially acquires any Equity Placement Shares or to whom any offer of Equity Placement Shares may be made and, to the extent applicable, any funds on behalf of which such person is acquiring the Equity Placement Shares that are located in a Member State will be deemed to have represented, acknowledged and agreed that it is an EEA Qualified Investor.

UK Restrictions and Deemed Investor Representations

This announcement, as it relates to the Equity Placement, and the Equity Placement when made, are only addressed to, and directed in, the United Kingdom (the "UK"), at persons who are "qualified investors" within the meaning of the EU Prospectus Regulation as it forms part of UK law by virtue of the European Union (Withdrawal) Act 2018, as amended (the "EUWA") ("UK Qualified Investors"). Each person in the UK who initially acquires any Equity Placement Shares or to whom any offer of Equity Placement Shares may be made and, to the extent applicable, any funds on behalf of which such person is acquiring the Equity Placement Shares that are located in the UK will be deemed to have represented, acknowledged and agreed that it is a UK Qualified Investor.

In addition, in the UK, this announcement is being distributed only to, and is directed only at, qualified investors (i) who have professional experience in matters relating to investments falling within Article 19(5) of the financial Services And Markets Act 2000 (Financial Promotion) Order 2005, as amended (the "Order"); (ii) falling within Article 49(2)(a) to (d) of the Order, or (iii) to whom it may otherwise lawfully be communicated (all such persons together being referred to as "relevant persons"). This announcement must not be acted on or relied on in the UK by persons who are not relevant persons. Any investment or investment activity to which this announcement relates is available only to relevant persons in the UK and will be engaged in only with relevant persons in the UK.

Canada Selling Restrictions and Deemed Investor Representations

This announcement, as it relates to the Equity Placement, and the Equity Placement when made, are only addressed to purchasers purchasing, or deemed to be purchasing, as principal that are Accredited Investors, as defined in National Instrument 45-106 Prospectus Exemptions ("NI 45-106") or Subsection 73.3(1) of the Securities Act (Ontario) (The "OSA"), and are Permitted Clients, as defined in National Instrument 31-103 Registration Requirements, Exemptions And Ongoing Registrant Obligations ("NI 31-103"). Each person in Canada who initially acquires any Equity Placement Shares or to whom any offer of Equity Placement Shares may be made will be deemed to have represented, acknowledged and agreed that it is a person purchasing, or deemed to be purchasing, as principal that is an Accredited Investor, as defined in NI 45-106 or Subsection 73.3(1) of the OSA, and a Permitted Client, as defined in NI 31-103.

Tirlán and the Joint Global Coordinators will rely upon the truth and accuracy of the foregoing representations, acknowledgements, and agreements.

THIS ANNOUNCEMENT RELATES TO THE DISCLOSURE OF INFORMATION THAT QUALIFIED OR MAY HAVE QUALIFIED AS INSIDE INFORMATION WITHIN THE MEANING OF ARTICLE 7(1) OF THE MARKET ABUSE REGULATION (EU) 596/2014 ("MAR"). FOR THE PURPOSES OF MAR AND ARTICLE 2 OF COMMISSION IMPLEMENTING REGULATION (EU) 2016/1055, THIS ANNOUNCEMENT IS MADE BY ERIKA MURPHY, GENERAL COUNSEL.