Mr. Chris Lang 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 Nov. 17, 2023. 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, Citigroup and Canaccord Genuity.

During the quarterly period ended March 31, 2025, the company issued a total of 281,900 common shares on the TSX Venture Exchange at an average price of $2.25 (Canadian) per share and 4,289,470 common shares on the NYSE American LLC at an average price of $1.56 (U.S.) under the ATM program, providing gross proceeds of $633,409 (Canadian) and $6,705,092 (U.S.), respectively. Commissions of $15,835 (Canadian) and $167,627 (U.S.) were 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 brine projects characterized by high-grade resources, robust infrastructure, skilled labour and streamlined permitting. The company 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 located in the Smackover formation, a world-class lithium brine asset, focused in Arkansas and Texas. In partnership with global energy leader Equinor ASA, the company is advancing the southwestern Arkansas project, a greenfield project located in southern Arkansas, and actively exploring promising lithium brine prospects in east Texas. The company also holds an interest in certain mineral leases in the Mojave Desert in San Bernardino county, California.

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