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OceanaGold Announces Effective Date of Share Consolidation in Connection with Proposed U.S. Listing

Corporate Actions

www.oceanagold.com

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June 19, 2025 News Release

OceanaGold Announces Effective Date of Share Consolidation in

Connection with Proposed U.S. Listing

(VANCOUVER, BC ) OceanaGold Corporation (TSX : OGC, OTCQX: OCANF ) (“OceanaGold” or the

“Company”) announces the consolidation of its common shares on the basis of three (3) pre-consolidation

common shares f or one (1) post -consolidation common share (the “Consolidation”) will take effect as of

Monday, June 23, 2025 (the “Effective Date”).

The shareholders of OceanaGold approved the Consolidation at the Annual General and Special Meeting

held on June 4, 2025.

The Company is considering a dual listing of its common shares on a major U.S. exchange, including the

New York Stock Exchange, in the first half of 2026. The Company believes a U.S. listing could lead to

increased interest by a wider audience of potential investors and result in in creased marketability and

trading liquidity. The motivation of the Consolidation is to raise the per share trading price of the Company’s

common shares to better comply with minimum trading price requirements of such exchanges.

OceanaGold’s post-consolidation common shares will be posted for trading on the Toronto Stock Exchange

at the opening of trading on the Effective Date, under the current symbol “OGC” and new CUSIP number

675222400.

As at the date of this news release, the Company has 693,379,818 common shares issued and outstanding.

Following the completion of the Consolidation on the Effective Date, the Company is expected to have

approximately 231,126,566 common shares issued and outstanding, subject to rounding . The exercise or

conversion price of all performance rights and deferred share units will be proportionately adjusted reflecting

the Consolidation ratio. No fractional post -consolidation common shares will be issued in effect with the

Consolidation. Any fractional common share interest of 0.50 or more arising from the Consolidation will be

rounded up to the nearest whole number, and any fractional common share interest of less than 0.50 will

be cancelled.

www.oceanagold.com

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Registered shareholders holding pre-Consolidation common shares through the Direct Registration System

(“DRS”) will be automatically sent a DRS advice by the Company’s transfer agent, Computershare Investor

Services Inc. (“Computershare”), representing the number of post-Consolidation common shares they hold

following the Consolidation and no further action is required to be taken . Beneficial shareholders holding

their common shares through intermediaries such as a broker, trustee or other financial institution should

note that such intermediaries may have different procedures for processing the Consolidation than those

put in place by the Company for the registered shareholders. Beneficial shareholders who have questions

regarding how their common shares will be processed in connection with the Consolidation should contact

their intermediaries. Registered shareholders holding their pre-Consolidation common shares in certificate

forms will receive a letter of trans mittal from Computershare containing instructions on how to exchange

their pre-consolidation share certificates for post-Consolidation shares.

About OceanaGold

OceanaGold is a growing intermediate gold and copper producer committed to safely and responsibly

maximizing the generation of Free Cash Flow from our operations and delivering strong returns for our

shareholders. We have a portfolio of four operating mines: the Haile Gold Mine in the United States of

America; Didipio Mine in the Philippines; and the Macraes and Waihi operations in New Zealand.

For further information please contact:

Investor Relations:

Haley Mayers, VP, Investor Relations

Tel: +1 604-678-4097

[email protected]

Valerie Burns, Manager, Investor Relations

Tel: +1 604-235-0742

[email protected]

Media Relations:

Louise Burgess, Director, Communications

Tel: +1 604-403-2019

[email protected]

www.oceanagold.com

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Cautionary Statement for Public Release

This press release contains certain "forward -looking statements" and "forward -looking information"

(collectively, "forward-looking statements") within the meaning of applicable Canadian securities laws which

may include, but is not limited to, statements with respect to the Company being listed on a major U.S.

exchange, including such dual listing leading to increased interest by a wider audience of potential

investors, increased marketability and trading liquidity and the expected timing for s uch listing, and the

anticipated Effective Date and effects of the completion of the Consolidation. Forward-looking statements

and information relate to future performance and ref lect the Company’s expectations regarding the

generation of Free Cash Flow, execution of business strategy, future growth, future production, estimated

costs, results of operations, business prospects and opportunities of OceanaGold and its related

subsidiaries. Any statements that express or involve discussions with respect to predictions, expectations,

beliefs, plans, projections, objectives, assumptions or future events or performance (often, but not always,

using words or phrases such as "expects" or "d oes not expect", "is expected", "anticipates" or "does not

anticipate", "plans", "estimates" or "intends", or stating that certain actions, events or results "may", "could",

"would", "might" or "will" be taken, occur or be achieved) are not statements of h istorical fact and may be

forward-looking statements. Forward-looking statements are subject to a variety of risks and uncertainties

which could cause actual events or results to differ materially from those expressed in the forward -looking

statements. They include, among others, those risk factors identified in the Company’s most recent Annual

Information Form prepared and filed with securities regulators which is available on SEDAR+ at

www.sedarplus.com under the Company’s name and on the Company’s website. There are no assurances

the Company can fulfil forward -looking statements. Such forward-looking statements are only predictions

based on current information available to management as of the date that such predictions are made; actual

events or results may differ materially as a result of risks facing the Company, some of which are beyond

the Company's control. Although the Company believes that any forward -looking statements contained in

this press release is based on reasonable assumptions, readers can not be assured that actual outcomes

or results will be consistent with such statements. Accordingly, readers should not place undue reliance on

forward-looking statements . The Company expressly disclaims any intention or obligation to update or

revise any forward-looking statements and information, whether as a result of new information, events or

otherwise, except as required by applicable securities laws.