Alumina Limited ('Alumina') announces that it has entered into a Scheme Implementation Deed ('SID') with Alcoa Corporation ('Alcoa') in relation to a proposal for Alcoa to acquire 100% of the fully paid ordinary shares in Alumina by way of a scheme of arrangement ('the Transaction').

Under the terms of the SID, eligible Alumina shareholders will be entitled to receive 0.02854 shares of Alcoa common stock (in the form of ASX-listed Alcoa CHESS Depositary Interests (CDIs)) for each Alumina share held. This exchange ratio implies a 19.5% premium to the average exchange ratio over the last 12 months1 .

On implementation of the Transaction, Alumina shareholders on the record date will own approximately 31.6% of the combined group, and existing Alcoa shareholders will own approximately 68.4%.2 Alcoa has agreed to establish a foreign exempt listing on the Australian Securities Exchange (ASX), which would enable Alumina shareholders to trade shares of Alcoa common stock via CDIs on the ASX, in the same way they would normally trade ASX-listed Alumina shares. Alcoa has agreed to appoint two existing Alumina directors who are Australian residents or citizens to the Alcoa board of directors, on implementation of the Transaction.3

Board Recommendation

The Independent Non-executive Directors and Managing Director and CEO of Alumina recommend that Alumina shareholders vote in favour of the Transaction, in the absence of a superior proposal for Alumina and subject to the independent expert concluding (and continuing to conclude) that the Transaction is in the best interests of Alumina shareholders.4 Additionally, the Independent Non-executive Directors of Alumina, and the Managing Director and CEO of Alumina, intend to vote all shares in Alumina which they hold or control in favour of the Transaction at the scheme meeting, in the absence of a superior proposal for Alumina and subject to the independent expert concluding (and continuing to conclude) that the Transaction is in the best interests of Alumina shareholders.

Benefits of combining with Alcoa The Transaction is expected to provide a number of benefits to Alumina shareholders, including the following: Unifies the ownership of Alcoa World Alumina and Chemicals ('AWAC'). The Transaction represents a logical combination which simplifies the corporate structure and aligns the interests of the two AWAC joint venture partners. If the Transaction is implemented, Alumina shareholders will exchange their interest in a minority non-operating joint venture partner for a direct interest in the operating entity. Exposure to a leading global pure play upstream aluminium company with a geographically diversified portfolio across bauxite, alumina and aluminium. Alumina shareholders will benefit from increased exposure to aluminium, a key product for energy transition and decarbonisation, while maintaining significant exposure to AWAC. Enhanced capital structure. The Transaction will eliminate the capital structure inefficiencies embedded in the current joint venture structure, with AWAC's balance sheet being largely ungeared historically. The Transaction will enable more efficient funding, resulting in potential financial synergies which will be shared by Alumina shareholders as investors in the combined group. Better platform for the future. The combined entity is expected to have increased financial flexibility and greater strategic optionality through access to a larger and stronger balance sheet.

Alumina Chairman, Peter Day, said: 'We believe the time is right to combine our two companies. The combined entity will have a larger and stronger balance sheet, and be better able to fund the current portfolio restructuring actions in AWAC, as well as realising potential growth options in the medium to longer term. Alumina shareholders will participate in a leading global pure play upstream aluminium company, with a low carbon smelting portfolio.'

Key conditions and terms

Alumina and Alcoa have entered into the binding SID, which contains the terms on which Alumina and Alcoa agree to implement the Transaction. In summary, key conditions for implementation of the Transaction include: Alumina shareholder approval in respect of the scheme of arrangement; Alcoa stockholder approval authorising the issuance of Alcoa shares as consideration under the scheme of arrangement; regulatory approvals and confirmations from Australia's Foreign Investment Review Board, the Australian Competition and Consumer Commission, and the Brazilian Administrative Council for Economic Defense; approval of the Federal Court of Australia; the independent expert concluding (and continuing to conclude) that the Transaction is in the best interests of Alumina shareholders; receipt of confirmation of an ATO class ruling for scrip-for-scrip roll over relief and other customary conditions

The SID is subject to customary deal protections for both Alcoa and Alumina, including no shop, no talk, no due diligence and notification obligations. Alumina is also bound by other customary provisions, including a matching right for Alcoa in the event of a competing proposal for Alumina. The SID includes certain circumstances in which a break fee of US$22 million would be payable to Alcoa, or a reverse break fee of up to US$50 million would be payable to Alumina. Full details of the terms and conditions of the Transaction are set out in the SID, a copy of which is set out in Annexure A

Indicative Timetable and Next Steps

Alumina shareholders do not need to take any action at this stage. As outlined above, the Transaction is subject to a number of conditions, including approval of Alumina shareholders at a scheme meeting which is targeted to be held in 3Q 2024. Alumina will send a scheme booklet containing an explanatory statement and notice of meeting to Alumina shareholders in due course. The scheme booklet will contain information in relation to the Transaction and an independent expert's report on whether the Transaction is in the best interests of Alumina shareholders. If the Transaction is approved by Alumina shareholders and the other conditions precedent are satisfied or waived, the Scheme is expected to be implemented by 3Q 20245

Contact:

Craig Evans

Tel: +61 408 441 122

Email: Associates IR@aluminalimited.com

Forward-looking statements

This document may contain certain forward-looking statements, including forward looking statements within the meaning of the US Private Securities Litigation Reform Act of 1995. All statements other than statements of historical fact in this communication or referred to or incorporated by reference into this communication are 'forward-looking statements'. The words 'anticipate', 'aim', 'believe', 'expect', 'project', 'estimate', 'forecast', 'intend', 'likely', 'should', 'could', 'will', 'may', 'target', 'plan' and other similar expressions (including indications of 'objectives') are intended to identify forward-looking statements. Indications of, and guidance on, future financial position and performance and distributions, statements regarding Alumina Limited's future developments and the market outlook, and statements regarding the future process for the Transaction, are also forward-looking statements. Any forward-looking statements contained in this document are not guarantees of future performance. Such forward-looking statements involve known and unknown risks, uncertainties and other factors, many of which are beyond the control of Alumina Limited and its directors, officers, employees and agents that may cause actual results to differ materially from those expressed or implied in such statements. Those risks, uncertainties and other factors include (without limitation): (a) material adverse changes in global economic conditions, alumina or aluminium industry conditions or the markets served by AWAC; (b) changes in production or development costs, production levels or sales agreements; (c) changes in laws, regulations, policies or regulatory decision making; (d) changes in alumina or aluminium prices or currency exchange rates; (e) Alumina Limited does not hold a majority interest in AWAC and decisions made by majority vote may not be in the best interests of Alumina Limited and (f) the other risk factors summarised in Alumina Limited's Annual Report 2022. In addition, with respect to the Transaction, relevant factors may include, among others: (1) the risk that the Transaction may not be completed in a timely manner or at all, (2) the failure to receive, on a timely basis or otherwise, the required approvals of the Transaction by Alcoa stockholders or Alumina shareholders or the required approval of the scheme of arrangement by the Australian court, (3) the possibility that any or all of the various conditions to the consummation of the Transaction may not be satisfied or waived, including the failure to receive any required regulatory approvals from any applicable governmental entities (or any conditions, limitations or restrictions placed on such approvals), (4) the possibility that competing offers or acquisition proposals for Alumina or Alcoa will be made, (5) the occurrence of any event, change or other circumstance that could give rise to the termination of the SID, including in circumstances which would require Alcoa to pay a termination fee, (6) the effect of the announcement or pendency of the Transaction on Alumina's operating results and business generally, (7) risks related to diverting management's attention from Alumina's ongoing business operations, (8) the risk of litigation in connection with the Transaction, including resulting expense or delay, and (9) those risks discussed in the documents that Alumina files with the ASX. Readers should not place undue reliance on forward-looking statements. Forward-looking statements are based on management's current expectations and reflect Alumina's good faith assumptions, judgements, estimates and other information available as at the date of this communication. Except as required by law, Alumina Limited disclaims any responsibility to update or revise any forward-looking statements to reflect any new information or any change in the events, conditions or circumstances on which a statement is based or to which it relates.

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