Form 6-K: Exhibit 99.1 incorporated into Standard Lithium F-10

Rhea-AI Filing Summary

Standard Lithium Ltd. filed a Form 6-K that incorporates its Underwriting Agreement as Exhibit 99.1 into its Form F-10 registration statement (File No. 333-289110).

The company also furnished a press release as Exhibit 99.2, which is not filed and will not be incorporated by reference into any registration statement.

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Accepted by SEC EDGAR 10/17/2025 - 08:48 PM Learn about SEC filing dates

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16
of the Securities Exchange Act of 1934

For the month of	October		2025
Commission File Number	001-40569

Standard Lithium Ltd.

(Translation of registrant’s name into English)

Suite 1625, 1075 W Georgia Street

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

INCORPORATION BY REFERENCE

Exhibit 99.1 of this Report on Form 6-K is incorporated by reference into the Registration Statement on Form F-10 (File No. 333-289110) of the Registrant, as amended or supplemented. Exhibit 99.2 of this Report on Form 6-K, is furnished, not filed, and will not be incorporated by reference into any registration statement filed by the Registrant under the Securities Act of 1933, as amended.

DOCUMENTS INCLUDED AS PART OF THIS REPORT

Exhibit
99.1	Underwriting Agreement dated October 16, 2025.
99.2	Press release dated October 16, 2025.

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:	October 17, 2025		By:	/s/ Salah Gamoudi
				Name:	Salah Gamoudi
				Title:	Chief Financial Officer

FAQ

What did SLI file in this Form 6-K?

The company filed a Form 6-K that includes Exhibit 99.1 (Underwriting Agreement) and Exhibit 99.2 (press release).

How does this 6-K affect Standard Lithium’s Form F-10?

Exhibit 99.1 is incorporated by reference into the Form F-10 registration statement (File No. 333-289110).

Is the press release in the 6-K part of any registration statement?

No. Exhibit 99.2 is furnished, not filed, and will not be incorporated by reference into any registration statement.

Which exhibit was incorporated by reference?

Exhibit 99.1, the Underwriting Agreement, was incorporated by reference into the Form F-10.

What is the file number of the Form F-10 referenced by SLI?

The file number is 333-289110.