Standard Lithium Ltd. Announces Director Resignation

Standard Lithium Ltd. has announced that Karen Narwold will resign from its Board of Directors, effective September 15, 2026. This resignation is due to her acceptance of a new executive position with increased time commitments. Following her departure, the Board will comprise eight directors. The company has commenced a search for a new independent director to complement the Board's expertise and support its strategic growth objectives. An announcement regarding the new appointment is expected upon the conclusion of this process. This report is filed on Form 6-K and incorporates by reference a material change report dated September 15, 2026, detailing Ms. Narwold's resignation.