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OceanaGold Provides Notice of First Quarter 2026 Results, Conference Call, and 2026 Annual Meeting of the Shareholders

Shareholder Meetings

www.oceanagold.com 1

NEWS RELEASE

April 16, 2026

OceanaGold Provides Notice of First Quarter 2026 Results,

Conference Call, and 2026 Annual Meeting of the Shareholders

VANCOUVER, BC – OceanaGold Corporation (TSX: OGC) ( NYSE: O GC) (“OceanaGold” or the

“Company”) will release its operational and financial results for the first quarter of 2026 after market close

on Wednesday, May 6 , 2026. The results will be made available on the Company’s website at

www.oceanagold.com. The Company will hold its 2026 annual meeting of the shareholders (the “AGM”)

on Tuesday, June 9, 2026.

First Quarter 2026 Results Conference Call Details

Senior management will host a conference call and webcast to discuss the first quarter 2026 results on

Thursday, May 7, 2026, at 10:00am E DT (7:00am PDT). To participate in the conference call, please use

one of the following methods:

Webcast: https://app.webinar.net/8KkdZq6zb7e

Toll-free North America: 1-888-510-2154

International: 1-437-900-0527

If you are unable to attend the call, a recording will be made available on the Company’s website.

Virtual AGM Details

The Company will hold its AGM on Tuesday, June 9, 2026, at 12:00pm EDT (9:00am PDT). The meeting will

be held virtually via a live webcast accessible on the day at: https://www.meetnow.global/MNHGK99.

The record date to determine the holders of the Company’s common shares who are entitled to receive

notice of, and to vote at, the AGM is April 23, 2026. Detailed voting and participation instructions for

eligible shareholders will be provided in the Company’s AGM Management Information Circular, expected

to be published on the Company’s website in early May 2026.

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About OceanaGold

OceanaGold is a g lobal 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 wholly-owned Haile Gold Mine in the United

States of America; the wholly-owned Macraes and Waihi operations in New Zealand; and the 80%-owned

Didipio Mine in the Philippines.

For further information please contact:

Investor Relations:

Rebecca Henare, VP , Investor Relations

Tel: +1 604-678-4095

[email protected]

Valerie Burns, Manager, Investor Relations

Tel: +1 604-235-0742

[email protected]

Media Relations:

Louise Burgess, VP , Communications

Tel: +1 604-403-2019

[email protected]