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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 40 - F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 ☑ or ANNUAL REPORT PURSUANT TO SECTION 13 ( a ) OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended June 30 , 2021 Canada ( Province or other jurisdiction of incorporation or organization ) Commission File Number 001-40569 Standard Lithium Ltd. ( Exact name of Registrant as specified in its charter ) 2800 ( Primary Standard Industrial Classification Code Number ) Suite 110 , 375 Water Street Vancouver , British Columbia , Canada V6B 5C6 ( 604 ) 409-8154 Not Applicable ( I.R.S. Employer Identification Number ) ( Address and telephone number of Registrant's principal executive offices ) CT Corporation System 1015 15th Street N.W. , Suite 1000 Washington , DC 20005 ( 202 ) 572-3133 ( Name , address ( including zip code ) and telephone number ( including area code ) of agent for service in the United States ) Securities registered or to be registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Shares , without par value Trading Symbol SLI Name of each exchange on which registered NYSE American LLC Securities registered or to be registered pursuant to Section 12 ( g ) of the Act : None Securities for which there is a reporting obligation pursuant to Section 15 ( d ) of the Act : None For annual reports , indicate by check mark the information filed with this Form : × Annual information form × Audited annual financial statements