Standard Lithium director to exit Sept 2026

Standard Lithium announces the planned resignation of director Karen Narwold and begins searching for a new independent board member.

Rhea-AI Filing Summary

Standard Lithium Ltd. (SLI) reported a governance update, announcing that director Karen Narwold will resign from its Board of Directors effective September 15, 2026 after accepting a new executive role. Following her departure, the Board will comprise eight directors.

The company has started a search for a new independent director aimed at complementing the Board’s existing experience and supporting its growth and strategic objectives across its lithium-brine projects in Arkansas and Texas.

Key Figures

Director resignation effective date: September 15, 2026 Board size after resignation: 8 directors Report month: September 2026 +1 more

4 metrics

Director resignation effective date September 15, 2026 Effective date of Karen Narwold’s resignation from the Board of Directors

Board size after resignation 8 directors Board composition following Karen Narwold’s resignation

Report month September 2026 Month covered by the Form 6-K report of foreign private issuer

Press release date September 11, 2026 Date of the press release announcing the Board change

Key Terms

foreign private issuer, direct lithium extraction, Smackover Formation, greenfield project, +1 more

5 terms

foreign private issuer regulatory

"Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16"

A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.

direct lithium extraction technical

"via the application of a scalable and fully integrated direct lithium extraction"

A method for pulling lithium directly out of salty water or other raw sources using special materials and electrical or chemical processes, instead of relying on long evaporation ponds or mining rock. It matters to investors because it can speed up production, lower costs and environmental impact, and make lithium supply for batteries more reliable—like replacing a slow, weather-dependent harvest with a faster, machine-driven picker that boosts output and predictability.

Smackover Formation technical

"The Company’s flagship projects are in the Smackover Formation, an attractive lithium"

A thick, ancient layer of limestone and dolomite rock in the Gulf Coast region that can act like a sponge, holding oil and natural gas within its pores and fractures. Investors care because the presence, quality and accessibility of hydrocarbons in this formation affect a producer’s potential reserves, drilling costs and future revenue — similar to how finding a larger, easier-to-drain water well increases the value of a property.

greenfield project technical

"advancing the South West Arkansas project, a greenfield project located in southern"

A greenfield project is a new investment where a company builds operations, facilities, or infrastructure from scratch on undeveloped land rather than modifying existing assets. For investors, it means potential for long-term growth and higher initial costs and risks—like planting a new orchard that can yield fruit for years but needs more time, money and care before producing returns—so it affects capital allocation, timelines and risk profiles.

lithium-brine properties technical

"development of a portfolio of large, high-grade lithium-brine properties in the United"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What board change did Standard Lithium (SLI) announce in this 6-K?

Standard Lithium announced that Karen Narwold will resign from its Board of Directors, effective September 15, 2026, following her acceptance of a new executive position with greater time commitments.

When is Karen Narwold’s resignation from Standard Lithium’s Board effective?

Her resignation from Standard Lithium’s Board of Directors is effective on September 15, 2026, after which the Board will continue with eight directors while the company searches for a new independent member.

How many directors will Standard Lithium (SLI) have after the resignation?

After Karen Narwold’s resignation becomes effective, Standard Lithium’s Board of Directors will consist of eight directors, as stated in the company’s announcement.

Is Standard Lithium (SLI) planning to replace the departing director?

Yes. Standard Lithium has initiated a search for a new independent director who will complement the Board’s existing experience and expertise and support the company’s growth and strategic objectives.

What does Standard Lithium (SLI) say about its business focus in this filing?

Standard Lithium describes itself as a near-commercial lithium development company focused on sustainably developing large, high-grade lithium-brine properties in the United States, with flagship projects in the Smackover Formation in Arkansas and Texas.

Which major partner is mentioned for Standard Lithium’s South West Arkansas project?

Standard Lithium notes that it is advancing the South West Arkansas project in partnership with Equinor, described as a global energy leader, as part of its lithium-brine development activities.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/11/2026 - 04:45 PM Accepted by SEC EDGAR 09/11/2026 - 04:45 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 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2026

Commission File Number: 001-40569

Standard Lithium Ltd.
(Translation of registrant's name into English)

Suite 1625, 1075 West Georgia Street
Vancouver, British Columbia, Canada V6E 3C9
(Address of principal executive office)

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 ]

On September 11, 2026, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

(c) Exhibit 99.1. Press release dated September 11, 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: September 11, 2026		/s/ Salah Gamoudi
		Salah Gamoudi
		Chief Financial Officer

EXHIBIT 99.1

Standard Lithium Announces Change to Board of Directors

VANCOUVER, British Columbia, Sept. 11, 2026 (GLOBE NEWSWIRE) -- Standard Lithium Ltd. (“Standard Lithium” or the “Company”) (TSXV: SLI) (NYSE.A: SLI), a leading near-commercial lithium company, today announced that Karen Narwold will resign from the Company’s Board of Directors (the “Board”), effective September 15, 2026, following her acceptance of a new executive position and the increased time commitments associated with her new role.

“We thank Karen for her valuable contributions and commitment to Standard Lithium during her tenure on our Board,” said Bob Cross, Independent Chairman of Standard Lithium. “We congratulate her and wish her continued success in this next chapter of her career.”

Following Ms. Narwold’s resignation, the Board will consist of eight directors. The Company has initiated a search process for a new independent director that will complement the Board’s existing experience and expertise and support Standard Lithium’s continued growth and strategic objectives. The Company intends to announce an appointment following the conclusion of this process.

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 in the Smackover Formation, an attractive 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, including the highest known lithium brine grade project in North America, the Franklin project.

Standard Lithium trades on both the TSX Venture Exchange (“TSXV”) and the NYSE American under the symbol “SLI”. Visit the Company’s website at www.standardlithium.com for more information.

Investor Inquiries
Daniel Rosen
+1 604 409 8154
investors@standardlithium.com

Media Inquiries
media@standardlithium.com

X: @standardlithium
LinkedIn: https://www.linkedin.com/company/standard-lithium/

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

This news release may contain certain “Forward-Looking Statements” within the meaning of the United States Private Securities Litigation Reform Act of 1995 and applicable Canadian securities laws. When used in this news release, the words “anticipate”, “believe”, “expect”, “plan”, “intend”, “may”, “will” and other similar words or expressions identify forward-looking statements or information. These forward-looking statements or information may relate to the Company’s intended timeline for onboarding an additional independent director, any new independent director’s ability to complement the Board’s existing experience and expertise, the accuracy of mineral or resource exploration activity at the Company’s flagship projects, and other factors or information. Such statements represent the Company’s current views with respect to future events and are necessarily based upon a number of assumptions and estimates that, while considered reasonable by the Company, are inherently subject to significant business, economic, competitive, political and social risks, contingencies and uncertainties. Many factors, both known and unknown, could cause results, performance or achievements to be materially different from the results, performance or achievements that are or may be expressed or implied by such forward-looking statements. The Company does not intend, and does not assume any obligation, to update these forward-looking statements or information to reflect changes in assumptions or changes in circumstances or any other events affecting such statements and information other than as required by applicable laws, rules and regulations.

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 PRESS RELEASE 5.5 KB