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IsoEnergy's 2025 Sustainability Report: A Commitment to Responsible Growth

IsoEnergy Ltd. has unveiled its 2025 Sustainability Report, reflecting the company's ongoing dedication to sustainable practices and responsible growth within the uranium sector. The report highlights significant strides in environmental stewardship, community engagement, and corporate governance, marking a pivotal moment for the company's transition from exploration to potential production.

Key Highlights of the Report

Environmental Stewardship and Operational Excellence

IsoEnergy is proud to announce that there were zero reportable environmental incidents across all its projects in 2025. This impressive achievement underscores the company's rigorous commitment to operational excellence. Key environmental initiatives included:

• - Baseline Water Quality Program: A comprehensive two-year study at the Larocque East Project laid the groundwork for critical environmental data and future project permitting.
• - Ongoing Environmental Monitoring: Active participation in monitoring, mitigation, reclamation, and restoration across various exploration projects continues to prioritize ecological health.
• - Enhanced Water Management Infrastructure: The installation of remote monitoring systems at the Tony M Mine represents a proactive approach to improve operational reliability and environmental supervision.

Empowering Indigenous Communities

IsoEnergy takes pride in fostering relationships with Indigenous communities, channeling 46% of its Canadian exploration spending towards Indigenous companies and contractors. This commitment translates into remarkable participation rates:

• - Workforce Involvement: Indigenous personnel made up 78% of the workforce at project sites in Quebec, while Saskatchewan reported a 33% participation rate.
• - Sustainable Procurement: In Quebec, Indigenous procurement represented 75% of exploration spending, with 42% in Saskatchewan.
• - Community Initiatives: Support for local education and training programs, including a mineral exploration scholarship and high school tours, reinforces IsoEnergy’s investment in community development.

Strengthening Governance Practices

The commencement of trading on the NYSE American serves as a testament to IsoEnergy's growth and commitment to high standards of governance. Key governance advancements included:

• - Leadership Expansion: The addition of a Vice President for Strategy and Commercial Operations and a Director for External Relations enhances the company’s governance structure.
• - Cybersecurity and Risk Management: A strong focus on cybersecurity, financial management, and regulatory compliance underlines IsoEnergy’s commitment to governance excellence.

CEO Commentary

Philip Williams, CEO and Director, stated, "As IsoEnergy continues to evolve, our adherence to environmental stewardship, community relationships, and robust corporate governance is vital to our success. In 2025, we have not only strengthened our environmental programs but also expanded partnerships with Indigenous communities, increased local job opportunities, and revised our governance framework substantially. The transition to NYSE trading is a significant milestone that reflects our aims and commitment to transparency and accountability. As demand for secure, low-carbon nuclear energy grows, we remain focused on advancing our projects responsibly while creating lasting value for our stakeholders."

About IsoEnergy Ltd.

IsoEnergy is a prominent uranium company, recognized for its extensive mineral resource portfolio in high-grade mining jurisdictions across Canada, the United States, and Australia. The company is currently advancing its Larocque East project, home to the world's highest-grade indicated uranium mineral resource. With a strong operational framework and a commitment to sustainable practices, IsoEnergy is well-positioned to capitalize on the increasing demand for uranium and low-carbon energy solutions.

For more detailed insights, the full report is accessible at IsoEnergy's Sustainability Page.