Standard Lithium (NYSE American: SLI), through its joint venture Smackover Lithium with Equinor, announced completion of sampling from the Lester well at its South West Arkansas (SWA) Project, recording the highest lithium concentration to date at 616 mg/L. The Lester well marks the final sub-surface exploration activity for Phase 1, with average concentrations from three samples reaching 582 mg/L. With fieldwork concluded, the JV team is advancing its FEED study and expects a Definitive Feasibility Study by Q3 2025, aiming for a Final Investment Decision by year-end.

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About Standard Lithium Ltd.

Standard Lithium is a leading near-commercial lithium development company focused on the sustainable development of a portfolio of large, high-grade lithium-brine properties in the United States. The company prioritizes projects characterized by the highest-quality resources, robust infrastructure, skilled labor and streamlined permitting. The company aims to achieve sustainable, commercial-scale lithium production via the application of a scalable and fully integrated direct lithium extraction (“DLE”) and purification process. The company’s flagship projects are located in the Smackover Formation, a world-class lithium-brine asset, focused in Arkansas and Texas. In partnership with global energy leader Equinor ASA, Standard Lithium is advancing the South West Arkansas Project, a greenfield project located in southern Arkansas, and is actively exploring promising lithium-brine prospects in east Texas. Additionally, the company is advancing the phase 1A project in partnership with LANXESS Corp., a brownfield development project located in southern Arkansas. Standard Lithium also holds an interest in certain mineral leases in the Mojave Desert in San Bernardino County, California. For more information about the company, please visit www.StandardLithium.com.

NOTE TO INVESTORS: The latest news and updates relating to SLI are available in the company’s newsroom at https://ibn.fm/SLI

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