Osisko Development Corp. Inclusion in GDXJ ETF

Osisko Development Corp. has been included in the VanEck Junior Gold Miners ETF (GDXJ) following the ETF's semi-annual review. This inclusion, effective March 20, 2026, is expected to enhance the company's market visibility and trading liquidity. Osisko Development, focused on the Cariboo Gold Project in British Columbia and the Tintic Project in Utah, aims to become an intermediate gold producer. The company believes this inclusion in the GDXJ reflects its progress in advancing and de-risking its projects. The GDXJ tracks liquid small- and mid-cap gold and silver mining companies globally. Osisko Development is committed to developing long-life assets in mining-friendly jurisdictions with a disciplined approach to capital allocation and risk management.