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Standard Lithium Appoints Karen G. Narwold to the Board of Directors

Management Changes

Standard Lithium Appoints Karen G. Narwold to the Board of Directors

VANCOUVER, British Columbia, March 19, 2025 -- Standard Lithium Ltd. (“Standard Lithium” or the “Company”) (TSXV:SLI)

(NYSE American:SLI), a leading near-commercial lithium company, is pleased to announce the appointment of Karen G.

Narwold, NACD.DC as an independent member of its board of directors.

Robert Cross, Non-Executive Chairman of the Board of Directors, commented, “The Standard Lithium Board is excited to

welcome Karen as an independent director. Karen brings over 30 years of executive leadership experience within the

manufacturing and chemicals space, including most recently as Chief Administrative Officer, General Counsel and Corporate

Secretary at Albemarle Corporation. Her significant experience in legal, governance, regulatory and government affairs and

operational matters will be invaluable as Standard Lithium seeks to develop its world class projects across the Smackover.”

“Karen is an accomplished senior executive with an impressive breadth of experience that will be a significant addition to

Standard’s board,” said David Park, Chief Executive Officer and Director of Standard Lithium. “Her leadership at Albemarle was

critical as they transformed into a global leader in lithium production, and we expect her experience will be crucial as Standard

Lithium seeks to do the same.”

Ms. Narwold brings over 30 years of experience leading legal, compliance, external affairs, governance, human resources and

corporate development functions for multinational companies. Prior to her service at Albemarle, from which she retired in 2023,

Ms. Narwold served as Vice President and Strategic Counsel of Barzel Industries, and as Vice President, General Counsel,

Human Resources and Corporate Secretary for GrafTech International. Ms. Narwold currently serves on the Board of Directors

for Ingevity Corporation, where she is a member of the Audit Committee and the Chair of the Sustainability & Safety

Committee.

Ms. Narwold is NACD Directorship Certified® and holds a Bachelor of Arts in political science from the University of

Connecticut and a Juris Doctor from the University of Connecticut School of Law.

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

the highest quality 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

(“DLE”) 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 exploring

promising lithium brine prospects in East Texas. Additionally, the Company is advancing the Phase 1A project in partnership

with LANXESS Corporation, a brownfield development project located in southern Arkansas. Standard Lithium also holds an

interest in certain mineral leases in the Mojave Desert in San Bernardino County, California.

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

more information on Standard Lithium, please visit the Company’s website at www.standardlithium.com.

Investor and Media Inquiries

Chris Lang

Standard Lithium Ltd.

+1 604 409 8154

[email protected]

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. This news release may contain certain “forward-looking statements” within the

meaning of the United States Private Securities Litigation Reform Act of 1995 and “forward looking information” within the

meaning of applicable Canadian securities laws. When used in this news release, the words “anticipate”, “believe”, “estimate”,

“expect”, “target, “plan”, “forecast”, “may”, “will”, “schedule” and other similar words or expressions identify forward-looking

statements or information. These forward-looking statements or information may relate to intended development timelines,

future prices of commodities, accuracy of mineral or resource exploration activity, reserves or resources, outcomes of

commercialization, regulatory or government requirements or approvals, the reliability of third party information, continued

production of lithium chloride solutions, consistent ongoing lithium recovery quantities, continued access to mineral properties

or infrastructure, fluctuations in the market for lithium and its derivatives, changes in exploration costs and government

regulation in Canada and the United States, 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 or information. 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.