Mr. Daniel Rosen reports

STANDARD LITHIUM PROVIDES QUARTERLY ATM SALES UPDATE

Standard Lithium Ltd. has provided a quarterly update with respect to the company's previously announced at-the-market equity program launched on Aug. 8, 2025. The ATM program allows the company to issue and sell, from time to time, up to $50-million (U.S.) (or the Canadian-dollar equivalent) of its common shares from treasury to the public, at the company's discretion, pursuant to a sales agreement between the company, Canaccord Genuity and Evercore ISI.

During the quarterly period ended March 31, 2026, the company issued a total of 2,267,842 common shares on the NYSE American LLC exchange at an average price of $4.86 (U.S.) under the ATM program, providing gross proceeds of $11,026,050 (U.S.). A commission of $275,651 (U.S.) was paid to the agents, in relation to these distributions.

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 high-grade resources, robust infrastructure, skilled labour and streamlined permitting. Standard Lithium aims to achieve sustainable, commercial-scale lithium production through the application of a scalable and fully integrated direct lithium extraction and purification process. The company's flagship projects are in the Smackover formation, a world-class lithium brine asset, focused in Arkansas and Texas. In partnership with global energy leader Equinor, Standard Lithium is advancing the SWA project, a greenfield project located in southern Arkansas, and actively advancing a promising lithium brine resource position in east Texas, including the highest-known-lithium-brine-grade project in North America, the Franklin project.

Standard Lithium trades on both the TSX Venture Exchange and the NYSE American exchange under the symbol SLI.