Mr. Dan Rosen reports

STANDARD LITHIUM PROVIDES QUARTERLY ATM SALES UPDATE

Standard Lithium Ltd. is providing a quarterly update with respect to the company's previously announced at-the-market (ATM) 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 June 30, 2025, the company issued a total of 115,874 common shares on the TSX Venture Exchange at an average price of $2.26 per share and 6,393,216 common shares on the NYSE American LLC at an average price of $1.72 (U.S.) under the ATM program, providing gross proceeds of $262,300 and $10,990,422 (U.S.), respectively. Commissions and fees of $6,560 and $274,820 (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. 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.