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SLI.V ·

Standard Lithium Prices Upsized $130 Million Underwritten Public Offering

Financings

STANDARD LITHIUM PRICES UPSIZED $130

MILLION UNDERWRITTEN PUBLIC OFFERING

VANCOUVER, BC, October 16, 2025 – Standard Lithium Ltd. (“Standard Lithium” or the

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

the pricing of 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 US $130 million.

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

Evercore ISI as co-lead book-running managers and includes 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 (the “Over-Allotment Option”) 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 (defined below)), and for working capital and for general corporate

purposes.

Closing of the Offering is expected to occur on or about October 20, 2025, and is subject to

customary closing conditions, including receipt of required approvals of the TSX Venture

Exchange (“TSXV”) and the NYSE American.

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

provinces and territories of Canada other than Quebec, a preliminary 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 preliminary 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 is being 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 final prospectus supplement (together with

the related Base Shelf Prospectus) will be available on SEDAR+ at www.sedarplus.ca. The final

U.S. prospectus supplement (together with the Registration Statement) will be available on the

SEC’s website at www.sec.gov. Alternatively, the final Prospectus Supplement (together with the

related Base Shelf Prospectus) may be obtained, when available, 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 final U.S. Prospectus Supplement (together with

the Registration Statement) may be obtained upon request, when available, 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. The securities being offered

have not been approved or disapproved by any regulatory authority, nor has any such authority

passed upon the accuracy or adequacy of the Prospectus Supplements, the Base Shelf

Prospectuses or the Registration Statement.

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

expected filing of the Prospectus Supplements, expected sale of Common Shares under the

Offering, whether and when the Offering may close, the satisfaction of customary closing

conditions related to the Offering, the anticipated use of proceeds from the Offering, anticipated

use of the proceeds of 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, that

the completes the Offering, that the proceeds of the Offering will be 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 ability of the Company to successfully close a financing, including filing

the Prospectus Supplements, and completing the Offering, 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.