Standard Lithium Ltd. Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submitsuch files). Yes☒No☐ EXPLANATORY NOTE Standard Lithium Ltd. ("Standard Lithium" or the "Company") is a Canadian issuer that is permitted, under themultijurisdictional disclosure system adopted in the United States, to prepare this Annual Report on Form 40-F (this"Annual Report") pursuant to Section 13 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), inaccordance with Canadian disclosure requirements, which are different from those of the United States. The Company PRINCIPAL DOCUMENTS The following documents, filed as Exhibits 99.1, 99.2 and 99.3 hereto, are incorporated herein by reference into thisAnnual Report: A. Annual Information Form of the Company for the year ended December 31, 2025 (the "AIF").* B. Management’s Discussion and Analysis of the Company for the year ended December 31, 2025 (the "MD&A").* C. Audited Consolidated Financial Statements of the Company as of and for the year ended December 31, 2025, thesix month fiscal period ended December 31, 2024 and the year ended June 30, 2024 (the "Audited FinancialStatements").* * The Company changed its fiscal year end from June 30 to December 31 on November 18, 2024 during the six monthfiscal period ended December 31, 2024 covered by this Annual Report. CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS Certain statements in this Annual Report are forward-looking statements under the provisions of the United StatesPrivate Securities Litigation Reform Act of 1995, Section 27A of the Securities Act, Section 21E of the Exchange Actand forward-looking information within the meaning of applicable Canadian securities legislation (collectively, "forward-looking statements"). These statements relate to future events or the Company’s future performance. All statements,other than statements of historical fact, may be forward-looking statements. Statements concerning mineral resourceand mineral reserve estimates also may be deemed to be forward-looking statements in that it reflects a prediction of In particular, this Annual Report contains or incorporates by reference forward-looking statements, including, withoutlimitation, with respect to the following matters or the Company’s expectations relating to such matters: the Company’splanned exploration and development programs (including, but not limited to, plans and expectations regardingadvancement, testing and operation of the lithium extraction at the Company's direct lithium extraction demonstrationplant);commercial opportunities for lithium products;delivery of studies;the Company's strategic and ongoingpartnerships, including with Equinor TDI Holdings LLC and certain of its subsidiaries; filing of technical reports;expected results of exploration; accuracy of mineral or resource exploration activity; ability to secure further leaseholdpositionsand perform further exploration drilling in East Texas;anticipated timing for a preliminary economicassessment of the Franklin project (the "Franklin Project" in the northeast region of Texas ("East Texas"); accuracy ofmineral reserves or mineral resources estimates, including the ability to develop and realize on such estimates; whethermineral resources will ever be developed into mineral reserves, and information and underlying assumptions related Forward-looking statements do not take into account the effect of transactions or other items announced or occurringafter the statements are made. They are based on a number of expectations and assumptions and are subject to risks With respect to the forward-looking statements described above, the Company has made assumptions regarding,among other things: current technological trends; the ability to fund, advance and develop its properties; the ability tooperate in a safe and effective manner; uncertainties with respect to receiving and maintaining mining, exploration,environmental and other permits; pricing and demand for lithium, including that such demand is supported by growth intheenergy security and storage market and the electric vehicle market;the impact of increasing competition;commodity prices, currency rates, interest rates, and general economic conditions; the legislative, regulatory andcommunityenvironments in the jurisdictions where the Company operates;the impact of unknown financial Although the Company believes the assumptions and expectations reflected in such forward-looking statements arereasonable, there can be no assurance that they will prove to be correct. Accordingly, undue reliance should not be Forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause theCompany’s actual results, performance