Mr. Daniel Rosen reports

STANDARD LITHIUM PROVIDES QUARTERLY ATM SALES UPDATE

Standard Lithium Ltd. today provided a quarterly update with respect to the company's previously announced at-the-market equity program (the ATM 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 Sept. 30, 2025, the company issued a total of 1,626,475 common shares on the NYSE American LLC at an average price of $3.10 (U.S.) under the ATM program, providing gross proceeds of $5,041,756 (U.S.). A commission of $126,044 (U.S.) was paid to the agents, in relation to these distributions.

Pursuant to the company's previous at-the-market equity program launched on Nov. 17, 2023, and terminated on July 31, 2025, the company also issued a total of 3,557,500 common shares on the NYSE American at an average price of $2.60 (U.S.), providing gross proceeds of $9,259,538 (U.S.) during the quarterly period ended Sept. 30, 2025.

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 via the application of a scalable and fully integrated direct lithium extraction 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 actively exploring promising lithium brine prospects in East Texas. Standard Lithium trades on both the TSX Venture Exchange and the NYSE American under the symbol SLI.