Osisko Gold Announces Pricing of Upsized US$600 Million 9.250% Senior Secured Notes Offering to Refinance Appian Project Financing Facility and Advance Cariboo Gold Project

TORONTO, Sept. 23, 2026 (GLOBE NEWSWIRE) — Osisko Gold Group Inc. (NYSE: OGG, TSXV: OGG) (“ Osisko Gold ” or the “ Company “) announces the pricing of its offering (the “ Offering “) of US$600 million aggregate principal amount of 9.250% senior secured notes due 2031 (the “ Notes “) to refinance its existing senior secured project loan facility with funds advised by Appian Capital Advisory Limited (the “ Appian Credit Facility “) and advance the construction of the Cariboo Gold Project in British Columbia, Canada (the “ Cariboo Gold Project “), at an issue price of 100.0%. The Offering is expected to close on September 30, 2026, subject to customary closing conditions. The Offering was upsized from the previously announced offering size of US$500 million aggregate principal amount of Notes.

The Notes will pay interest semi-annually in arrears on April 1 and October 1 of each year, commencing on April 1, 2027, and will mature on October 1, 2031. The Notes will be fully and unconditionally guaranteed by certain of the Company’s subsidiaries, which, at closing, is expected to consist of Barkerville Gold Mines Ltd., the Company’s subsidiary relating to the Cariboo Gold Project, and will be secured by a first priority lien on the Company’s and each guarantor’s property, including equity interests owned by the Company and each guarantor in their respective subsidiaries, the interest reserve account and disbursement account, as described herein, and personal and real property, subject to certain exceptions.

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Osisko Gold intends to use the aggregate net proceeds from the Offering, after deducting the initial purchasers’ discounts and commissions and estimated offering expenses, to

The Notes were offered and will be sold only to persons reasonably believed to be qualified institutional buyers in accordance with Rule 144A under the United States Securities Act of 1933, as amended (the “ Securities Act “), and to non-U.S. persons outside the United States pursuant to Regulation S under the Securities Act. The Notes were offered and will be sold in Canada on a private placement basis pursuant to applicable Canadian prospectus exemptions.

The offer and sale of the Notes have not been and will not be registered under the Securities Act or any state securities laws and the Notes may not be offered or sold in the United States or to U.S. persons absent registration or an applicable exemption from the registration requirements of the Securities Act and applicable state securities laws. This news release shall not constitute an offer to sell or the solicitation of an offer to buy the Notes, nor shall there be any offer or sale of the Notes in any jurisdiction in which such offer, solicitation or sale would be unlawful.

Osisko Gold Group Inc. is a continental North American gold development company focused on past producing mining camps with district-scale potential.