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SLI.V ·

Standard Lithium Establishes at-the- Market Equity Offering Program Under New Base Shelf Prospectus

Financings

STANDARD LITHIUM ESTABLISHES AT-THE-

MARKET EQUITY OFFERING PROGRAM UNDER

NEW BASE SHELF PROSPECTUS

VANCOUVER, BC, August 8, 2025 – Standard Lithium Ltd. (“Standard Lithium ” or the

“Company”) (TSXV: SLI) (NYSE American: SLI), a leading near-commercial lithium company,

today announced the establishment of an “at-the-market” equity program (the “ATM Program”)

under its new base shelf prospectus dated July 30, 2025, that allows the Company to issue and

sell, from time to time through agents, up to US$50,000,000 (or the Canadian dollar equivalent)

of its common shares (the “Offered Shares ”) from treasury to the public, at the Company’s

discretion (the “Offering”). This ATM Program replaces the prior program established in

November 2023 that has terminated.

Sales of Offered Shares, if any, under the ATM Program are anticipated to be made in

transactions that are deemed to be “at-the-market distributions” as defined in National Instrument

44-102 – Shelf Distributions and an “at-the-market offering” within the meaning of the U.S.

Securities Act of 1933, as amended, including sales made directly on the TSX Venture Exchange

(the “TSXV”), the NYSE American LLC (the “NYSE American”), or any other trading market for

the Offered Shares in Canada or the United States, at the prevailing market price at the time of

sale. The volume and timing of sales under the ATM Program, if any, will be determined in the

Company’s sole discretion, and at the market price prevailing at the time of each sale, and, as a

result, sale prices may vary.

Distributions of the Offered Shares through the ATM Program, if any, will be made pursuant to

the terms of an “at-the-market” sales agreement (the “Sales Agreement”) among the Company

and Canaccord Genuity and Evercore ISI. The ATM Program will be effective until the issuance

and sale of all of the Offered Shares issuable pursuant to the ATM Program, unless terminated

prior to such date in accordance with the terms of the Sales Agreement.

The Company expects to use the net proceeds of the Offering to fund ongoing work programs to

advance the South West Arkansas Project, exploration, leasehold acquisition and development

activities in East Texas, for working capital and for general corporate purposes.

Listing of the Offered Shares sold pursuant to the ATM Program on the TSXV and/or the NYSE

American will be subject to fulfilling all applicable listing requirements.

The sale of Offered Shares through the ATM Program is being made pursuant to a prospectus

supplement dated August 8, 2025 (the “Prospectus Supplement”) to the Company’s short form

base shelf prospectus dated July 30, 2025 (the “Base Prospectus”) filed with the securities

commissions in each of the provinces and territories of Canada, and in the United States pursuant

to a prospectus supplement dated August 8, 2025 (the “U.S. Prospectus Supplement”) to the

Company’s short form base shelf prospectus contained in the Company’s effective registration

statement on Form F-10 (File No. 333-289110) (the “Registration Statement”) filed with the U.S.

Securities and Exchange Commission (the “SEC”) under the U.S./Canada Multijurisdictional

Disclosure System. The Prospectus Supplement, the Base Prospectus, the U.S. Prospectus

Supplement and the Registration Statement contain important detailed information about the

Company and the ATM Program. Prospective investors should read the Prospectus Supplement,

the Base Prospectus, the Registration Statement, the U.S. Prospectus Supplement and the other

documents the Company has filed for more complete information about the Company and the

ATM Program before making an investment decision. Copies of the Prospectus Supplement and

the Base Prospectus are available on SEDAR+ at www.sedarplus.ca and copies of the U.S.

Prospectus Supplement and the Registration Statement are available on EDGAR at

www.sec.gov.

This news release does not constitute an offer to sell or the solicitation of an offer to buy the

Offered Shares, nor shall there be any sale of these securities in any province, state or jurisdiction

in which such an offer, solicitation or sale would be unlawful prior to registration or qualification

under the securities laws of any such province, state or jurisdiction.

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 labor, 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 TSXV and the NYSE American under the symbol “SLI”.

Neither the TSXV nor its Regulation Services Provider (as that term is defined in policies of the

TSXV) accepts responsibility for the adequacy or accuracy of this release.

Investor Inquiries

Daniel Rosen

+1 604 409 8154

[email protected]

Media Inquiries

[email protected]

This news release contains forward-looking statements and forward-looking information

(together, “forward-looking statements”) within the meaning of the United States Private Securities

Litigation Reform Act of 1995 and applicable Canadian securities laws. All statements, other than

statements of historical facts, are forward-looking statements. Generally, forward-looking

statements can be identified by the use of terminology such as “plans”, “expects”, “estimates”,

“intends”, “anticipates”, “believes” or variations of such words, or statements that certain actions,

events or results “may”, “could”, “would”, “might”, “occur” or “be achieved”. The forward-looking

statements contained herein may include, but are not limited to, information concerning the

expected sale of Offered Shares under the ATM Program, the price, volume and timing of the

sale and distribution of Offered Shares under the ATM Program, the anticipated use of proceeds

of any offering under the ATM Program and statements regarding the anticipated benefits and

impacts of the ATM Program. Forward-looking statements are based on the Company’s current

beliefs and assumptions as to the outcome and timing of future events, including, but not limited

to, that the Company makes sales of Offered Shares under the ATM Program, that the proceeds

of any offering conducted under the ATM Program will be deployed as anticipated and the

anticipated benefits and impacts of the ATM Program being realized. Forward-looking statements

involve risks, uncertainties and other factors that could cause actual results, performance and

opportunities to differ materially from those implied by such forward-looking statements. Factors

that could cause actual results to differ materially from these forward-looking statements include,

among other things: the ability of the Company to successfully close a financing, including the

ATM Program, the price, volume and timing of sale of Offered Shares under the ATM Program

not being determinable at this time, the anticipated use of proceeds from any offering made under

the Company’s Base Prospectus and any offerings to be conducted thereunder including the ATM

Program, the benefits and impacts of the ATM Program not being as anticipated, the risks and

uncertainties relating to exploration and development, the ability of the Company to obtain

additional financing, the need to comply with environmental and governmental regulations in

Canada and the United States, fluctuations in the prices of commodities, operating hazards and

risks, competition and other risks and uncertainties and other such factors as are set forth in the

Base Prospectus and the Prospectus Supplement, as well as the management discussion and

analysis and other disclosures of risk factors for Standard, filed on SEDAR+ at www.sedarplus.ca.

and on EDGAR at www.sec.gov. Although the Company believes that the information and

assumptions used in preparing the forward-looking statements are reasonable, undue reliance

should not be placed on these statements, which only apply as of the date of this news release,

and no assurance can be given that such events will occur in the disclosed time frames or at all.

Except where required by applicable law, the Company disclaims any intention or obligation to

update or revise any forward-looking statement, whether as a result of new information, future

events or otherwise.