Standard Lithium Reports Second Quarter 2025 Results

Achieved multiple critical milestones for development of the South West Arkansas ("SWA") Project

Steadily progressing towards a Final Investment Decision for Phase 1 of SWA targeted by year-end 2025

VANCOUVER, British Columbia, Aug. 08, 2025 (GLOBE NEWSWIRE) -- Standard Lithium Ltd. ("Standard Lithium" or the "Company") (TSXV:SLI) (NYSE.A: SLI), a leading near-commercial lithium company, today announced its financial and operating results for the three month period ended June 30, 2025.

"We have been working diligently alongside our joint venture partner Equinor to progress our lithium development projects and have achieved multiple key milestones in the second quarter as we advance those efforts," said David Park, Chief Executive Officer and Director of Standard Lithium. "We completed all fieldwork required for the first phase of our SWA Project and are advancing off-take and project financing discussions ahead of a Final Investment Decision targeted by the end of this year.

Additionally, in the third quarter we plan to release a Definitive Feasibility Study for SWA and a Maiden Inferred Resource Report on our East Texas properties. We expect both to further reinforce the conviction that our projects in the Smackover will deliver significant value to our shareholders, the communities that we work in, and will help to secure critical minerals production in the United States."

Highlights Subsequent to the Three Month Period Ended June 30, 2025

All amounts are in US dollars unless otherwise indicated.

Smackover Lithium Reports Highest Lithium Brine Grade in SWA Project AreaSmackover Lithium announced that it completed sampling from its newest exploration well, the Lester well, in the SWA Project area. One sample recorded the highest lithium concentration reported to date from the SWA Project area: 616 mg/L lithium in brine, while average lithium concentration in brine from the Lester well was 582 mg/L. This concluded all sub-surface exploration activities for Phase 1 of the SWA Project, which is targeting production capacity of 22,500 tonnes per annum of battery-quality lithium carbonate.

Highlights From Three Month Period Ended June 30, 2025

Royalty rate approved by the Arkansas Oil and Gas Commission for the SWA ProjectThe Arkansas Oil and Gas Commission ("AOGC") unanimously approved the establishment of a 2.5% royalty rate for Phase I of the SWA Project. This was the first royalty rate for lithium from brine extraction to be approved by the AOGC, establishing an important precedent for lithium development companies operating ...