OceanaGold

Dividends During the quarter ended June 30, 2026, the Company declared and paid a dividend of $0.09 per common share totaling $20.0 million to equity holders of the Company (quarter ended June 30, 2025: declared and paid a dividend of $0.03 per common share and paid the declared dividend of $0.03 per common share from the quarter ended March 31, 2025, totaling $14.0 million year to date to equity holders of the Company).

SEC original ↗OceanaGold — Earnings release (6-K exhibit)EX-99Aug 6, 2026

On August 5, 2026, OceanaGold declared a dividend of $0.09 per common share.

SEC original ↗OceanaGold — Earnings release (6-K exhibit)EX-99Aug 6, 2026

Share buyback In July 2026, the Company received approval from the TSX to renew the NCIB, permitting the Company to buy back up to 22 million common shares in the open market through the facilities of the TSX, NYSE and alternative trading systems in Canada and the United States during the period commencing on July 24, 2026 and ending on or before July 23, 2027.

SEC original ↗OceanaGold — Earnings release (6-K exhibit)EX-99Aug 6, 2026

In 2025, the Company completed the maximum $175 million in share buybacks under the Board of Directors approved share repurchase program for that year.

SEC original ↗OceanaGold — Earnings release (6-K exhibit)EX-99Aug 6, 2026

On February 18, 2026, the Board of Directors approved additional share buybacks to a maximum of $350 million of common shares in the open market through the facilities of the TSX, NYSE and alternative trading systems in Canada and the United States under the NCIB program.

SEC original ↗OceanaGold — Earnings release (6-K exhibit)EX-99Aug 6, 2026

During the second quarter of 2026, the Company repurchased and cancelled 1.8 million common shares for consideration of $57.5 million at an average price of CAD$43.94 per share.

SEC original ↗OceanaGold — Earnings release (6-K exhibit)EX-99Aug 6, 2026

With increased gold production expected in the second half of the year we remain focused on delivering on our guidance, reducing our unit costs, generating further free cash flow and continuing to create value for our shareholders.

SEC original ↗OceanaGold — Earnings release (6-K exhibit)EX-99Aug 6, 2026

Higher sustaining capital at Haile, Macraes and Didipio primarily reflected the timing of investment in site infrastructure, including resilience and mine life extension initiatives, and mobile fleet replacements.

SEC original ↗OceanaGold — Presentation / slide deck (6-K exhibit)EX-99Aug 6, 2026

Additionally, increased exploration investment reflects expanded drilling programs focused on resource conversion and near-mine growth opportunities at all sites, as planned.

SEC original ↗OceanaGold — Presentation / slide deck (6-K exhibit)EX-99Aug 6, 2026

The Company’s safety plans remain focused on the in-field verification of critical controls for high risk tasks and the “Stop and Think” program.

SEC original ↗OceanaGold — Presentation / slide deck (6-K exhibit)EX-99Aug 6, 2026

Recovery rates increased by 9% reflecting higher mill feed grade and the benefits of mill optimization initiatives which have enhanced mill reliability and performance, contributing to the highest monthly throughput in June 2026 since commissioning.

SEC original ↗OceanaGold — Presentation / slide deck (6-K exhibit)EX-99Aug 6, 2026

Notwithstanding the fact that the Supreme Court has previously upheld the constitutionality of the Mining Act and FTAAs, the Company is mindful that litigation is an inherently uncertain process and the outcome of the case may adversely affect the operation and financial position of the Company.

SEC original ↗OceanaGold — Earnings release (6-K exhibit)EX-99Aug 6, 2026

The petitioners initiated the challenge despite the fact that the Supreme Court had upheld the constitutional validity of both the Mining Act and the FTAAs in an earlier landmark case in 2005.

SEC original ↗OceanaGold — Earnings release (6-K exhibit)EX-99Aug 6, 2026

-Iran international conflict on the Company's operations, including potential impacts to operating and capital costs; governmental regulation of mining operations and exploration operations; fluctuations in commodity prices, including gold, copper and silver, and foreign exchange rates; anticipated environmental risks; the limitations and adequacy of insurance coverage; title matters, disputes, claims and land access; changes in laws, taxation and accounting standards; and the timing and possible outcome of pending legal proceedings, regulatory matters and other disputes, including the appeal to the permit approval for the Waihi North Project.

SEC original ↗OceanaGold — Earnings release (6-K exhibit)EX-99Aug 6, 2026

Forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements.

SEC original ↗OceanaGold — Earnings release (6-K exhibit)EX-99Aug 6, 2026

All statements included in this MD&A, other than statements of historical fact, including without limitation statements regarding potential mineralization, exploration results and future plans, production and objectives of the Company, are forward-looking statements that involve various risks, uncertainties and assumptions.

SEC original ↗OceanaGold — Presentation / slide deck (6-K exhibit)EX-99Aug 6, 2026

There can be no assurance that such statements will prove to be accurate and actual results and future events could differ materially from those anticipated in such statements as a result of a number of factors, including those set out in the “Risks and Uncertainties” section of this MD&A.

SEC original ↗OceanaGold — Presentation / slide deck (6-K exhibit)EX-99Aug 6, 2026