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6-K

Standard Lithium Ltd. (SLI)

6-K 2026-07-07 For: 2026-07-03
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Added on July 07, 2026

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Reportof Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 of the SecuritiesExchange Act of 1934

For the month of July 2026
Commission File Number 001-40569
Standard Lithium Ltd.
---
(Translation of registrant’s name into English)
Suite 1625, 1075 W Georgia Street<br><br> <br>Vancouver, British Columbia, Canada V6E 3C9
(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F ¨ Form 40-F x

DOCUMENTS INCLUDED AS PART OF THIS REPORT

Exhibit
99.1 Press Release dated July 3, 2026.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Standard Lithium Ltd.
(Registrant)
Date: July 6, 2026 By: /s/ Salah Gamoudi
Name: Salah Gamoudi
Title: Chief Financial Officer

Exhibit 99.1

STANDARD LITHIUMPROVIDES QUARTERLY ATM SALES UPDATE

VANCOUVER, BC,July 3, 2026 – Standard Lithium Ltd. (“Standard Lithium” or the “Company”) (TSXV: SLI) (NYSE American: SLI), a leading near-commercial lithium company, today provided a quarterly update with respect to the Company’s previously announced “at-the-market” equity program (the “ATM Program”) launched on August 8, 2025. The ATM Program allows the Company to issue and sell, from time to time, up to US$50,000,000 (or the Canadian dollar equivalent) of its common shares (“Common Shares”) from treasury to the public, at the Company’s discretion, pursuant to a sales agreement (the “Sales Agreement”) between the Company, Canaccord Genuity and Evercore ISI (collectively, the “Agents”).

During the quarterly period ended June 30, 2026, the Company issued a total of 3,139,330 Common Shares on the NYSE American LLC (the “NYSE American”) at an average price of US$3.59 under the ATM Program, providing gross proceeds of US$11,261,931. Commission and fees of US$281,780 were paid to the Agents, in relation to these distributions.

About StandardLithium 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 DLE and purification process. The Company’s flagship projects are 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 SWA Project, a greenfield project located in southern Arkansas, and actively advancing a promising lithium brine resource position in East Texas, including the highest known lithium brine grade project in North America, the Franklin Project.

Standard Lithium trades on both the TSX Venture Exchange (the “TSXV”) and the NYSE American under the symbol “SLI”.

Neither theTSXV nor its Regulation Services Provider (as that term is defined in policies of the TSXV) accepts responsibility for the adequacy oraccuracy of this release.

Investor Inquiries

Daniel Rosen

+1 604 409 8154

[email protected]

Media Inquiries

[email protected]