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SLI.V ·

Standard Lithium Closes $130 Million Underwritten Public Offering

Financings

STANDARD LITHIUM CLOSES $130 MILLION

UNDERWRITTEN PUBLIC OFFERING

VANCOUVER, BC, October 20, 2025 – Standard Lithium Ltd. (“Standard Lithium” or the

“Company”) (TSXV: SLI) (NYSE.A: SLI), a leading near-commercial lithium company, has closed

its previously announced underwritten public offering (the “Offering”) of 29,885,057 common

shares (the “Common Shares”) at a price of US $4.35 per Common Share (the “Issue Price”)

for aggregate gross proceeds to the Company of approximately US $130 million.

The Offering was conducted through a syndicate of underwriters led by Morgan Stanley and

Evercore ISI as co-lead book-running managers and included BMO Capital Markets, as a book-

running manager, Canaccord Genuity, Raymond James, Roth Capital Partners and Stifel

(together, the “Underwriters”).

The Company has granted the Underwriters an option to purchase up to 4,482,758 additional

Common Shares at the Issue Price, exercisable, in whole or in part, for up to 30 days after the

closing of the Offering.

The Company intends to use the net proceeds from the Offering to fund capital expenditures at

the South West Arkansas Project and the Franklin Project in East Texas (each, as defined in the

Prospectus Supplement (as defined below)), and for working capital and for general corporate

purposes.

In connection with the Offering, the Company filed, with the securities commissions in all of the

provinces and territories of Canada, a final prospectus supplement (the “ Prospectus

Supplement”) to the Company’s existing base shelf prospectus (the “Base Shelf Prospectus”)

filed with the securities commissions in each of the provinces and territories of Canada, and filed

a final prospectus supplement in the United States (the “U.S. Prospectus Supplement”, together

with the Prospectus Supplement, the “Prospectus Supplements”) to the Company’s existing

base shelf prospectus (the “U.S. Base Shelf Prospectus ”, together with the Base Shelf

Prospectus, the “Base Shelf Prospectuses”) forming part of an effective registration statement

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

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

The Offering was made in the United States and in each of the provinces and territories of

Canada, except Quebec. The Prospectus Supplements, the Base Shelf Prospectuses and the

Registration Statement contain important information about the Company and the proposed

Offering. Prospective investors should read the Prospectus Supplements, the Base Shelf

Prospectuses and the Registration Statement and the documents incorporated by reference

therein before making an investment decision. The Prospectus Supplement (together with the

related Base Shelf Prospectus) is available on SEDAR+ at www.sedarplus.ca. The U.S.

Prospectus Supplement (together with the Registration Statement) is available on the SEC’s

website at www.sec.gov. Alternatively, the Prospectus Supplement (together with the related

Base Shelf Prospectus) may be obtained upon request by contacting Morgan Stanley Canada

Limited: Morgan Stanley and Co. LLC, 180 Varick St, 2nd Floor, or BMO Nesbitt Burns Inc.,

Brampton Distribution Centre C/O The Data Group of Companies, 9195 Torbram Road,

Brampton, Ontario, L6S 6H2 by telephone at 905-791-3151 Ext 4312 or by email at

[email protected], and the U.S. Prospectus Supplement (together with the

Registration Statement) may be obtained upon request by contacting Morgan Stanley & Co. LLC:

180 Varick St, 2nd Floor, or Evercore Group L.L.C.: Equity Capital Markets, 55 East 52nd Street,

35th Floor, New York, NY 10055, by telephone at (888) 474-0200 or by e-mail at

[email protected].

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

nor will there be any sale of the securities in any province, territory, state or jurisdiction in which

such offer, solicitation or sale would be unlawful prior to the registration or qualification under the

securities laws of any such province, territory, 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, Standard Lithium is advancing the

South West Arkansas project, a greenfield project located in southern Arkansas, and actively

advancing a promising lithium brine resource position in East Texas.

Standard Lithium trades on both the TSX Venture Exchange (the “ TSXV”) and the NYSE

American, LLC 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

anticipated use of proceeds from the Offering and statements regarding the anticipated benefits

and impacts of the Offering. 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, the proceeds of the Offering being deployed as anticipated, and the anticipated benefits and

impacts of the Offering 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

anticipated use of proceeds from any offering made under the Company’s Base Shelf

Prospectuses and any offerings to be conducted thereunder, including the Offering, the benefits

and impacts of the Offering 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 Shelf Prospectuses and the

Prospectus Supplements, as well as the management discussion and analysis and other

disclosures of risk factors for the Company, 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.