Exhibit 99.6

Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section

906 of the Sarbanes-Oxley Act of 2002

In connection with the annual report of Standard Lithium Ltd. (the "Company") on Form 40-F for the year ended December 31, 2025, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, David Park, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1)
The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and
(2)
The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

 

Date: March 27, 2026

 

 

/s/ David Park

 

David Park

 

Chief Executive Officer

 

This certification accompanies the Report pursuant to § 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed "filed" by the Company for purposes of § 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section.