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Standard Lithium Announces New VP Appointments to Expand and Strengthen Senior Management

Management Changes

Standard Lithium Announces New VP Appointments to Expand and Strengthen

Senior Management

VANCOUVER, British Columbia, June 23, 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 Daniel Rosen

as Vice President of Strategy and Investor Relations, as well as Tim Sobel as Vice President of Health, Safety, Social and

Environment (“HSSE”).

“We are thrilled to welcome the additions of Daniel and Tim to our leadership team,” said David Park, Chief Executive Officer

and Director of Standard Lithium. “Dan’s strategic insight and deep experience in investor relations and capital markets, as

well as Tim’s extensive history in ensuring that HSSE standards are not only met, but exceeded and built-in to organizational

culture, will be invaluable as we continue to execute our growth strategy on a path towards first production.”

“Bringing on Daniel and Tim is the next step in our process of continuing to evolve and strengthen our capabilities,” said Salah

Gamoudi, Chief Financial Officer of Standard Lithium. “We’d also like to thank Chris Lang for helping to support our investor

relations function this past year. With Daniel coming onboard, this will allow Chris to prioritize and focus more on the financial

planning and treasury aspects of his role.”

Mr. Rosen brings more than 13 years of experience in corporate strategy, finance, and capital markets. Most recently, Mr.

Rosen played a key role in the post-acquisition integration of Arcadium Lithium into Rio Tinto, where he led cross-functional

initiatives to align strategic priorities, operational capabilities, and investor messaging. Prior to his role as Director of

Integration for Rio Tinto, Mr. Rosen held roles in Corporate Strategy, M&A and Investor Relations for Arcadium Lithium and

Livent and spent over six years with Barclays in its Investment Banking division. He has a proven track record of aligning

corporate vision with market opportunities and building trusted relationships across the investment community.

Mr. Sobel is a seasoned HSSE executive with over three decades of distinguished leadership in health, safety, security,

environmental, quality, sustainability, and risk management across global industrial and logistics sectors. He most previously

served as Vice President of HSSE for the Americas at DP World, where he oversaw HSSE strategy and execution across

more than 40 logistics, port, and terminal operations in North and South America. Prior to DP World, he held senior leadership

roles at Air Liquide, New Fortress Energy, Wilhelmsen Ship Management, and Sunoco Logistics, where he led multi-site

operational risk, compliance, and crisis management programs. His earlier service in the U.S. Coast Guard laid the foundation

for his deep regulatory expertise and command-level emergency response capabilities. Mr. Sobel is recognized for developing

and embedding world-class safety cultures, behavioral safety programs, and regulatory-compliant management systems.

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 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.

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

X: @standardlithium

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

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture

Exchange) 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

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

“target, “plan”, “forecast”, “may”, “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, regulatory or government

requirements or approvals, the reliability of third party information, 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. 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.