SGML Sigma Lithium Corporation

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM SD

SPECIALIZED DISCLOSURE REPORT

Sigma Lithium Corporation

(Exact name of the registrant as specified in its charter)

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Ana Cristina Cabral, +55 11 2985 0089

(Name and telephone number, including area code,
of the person to contact in connection with this report.)

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Check the appropriate box to indicate the rule pursuant to which this Form is being submitted, and provide the period to which the information in this Form applies:

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          Rule 13p-1 under the Securities Exchange Act (17 CFR 240.13p-1) for the reporting period from January 1 to December 31,                     .

X Rule 13q-1 under the Securities Exchange Act (17 CFR 240.13q-1) for the fiscal year ended December 31,2023.

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Section 1 – Conflict Minerals Disclosure

Item 1.01Conflict Minerals Disclosure and Report

Not applicable

Item 1.02Exhibit

Not applicable

Section 2 – Resource Extraction Issuer Disclosure

Item 2.01Resource Extraction Issuer Disclosure and Report

Sigma Lithium Corporation (the “Company”) is subject to Canada’s Extractive Sector Transparency Measures Act (“ESTMA”). The Company is relying on the alternative reporting provision of Item 2.01 and providing its ESTMA report for the year ended December 31, 2023 to satisfy the requirements of Item 2.01. The Company’s ESTMA report is available on the Company’s website at https://ir.sigmalithiumresources.com/wp-content/uploads/2024/10/ESTMA-Reporting-2023-v2.pdf or on the Government of Canada’s website at https://naturalresources.canada.ca/estma-data.

The payment disclosure required by Form SD is included as Exhibit 2.01 to this Form SD.

Section 3 – Exhibits Item 3.01Exhibits

The following exhibit is filed as part of this report:

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2 of 3

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the duly authorized undersigned.

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3 of 3

Exhibit 99.1

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¹ Enter the proper name of the Payee receiving the money (i.e. the municipality of x, the province of y, national government of z).

² Optional field.

³ When payments are made in-kind, the notes field must highlight which payment includes in-kind contributions and the method for calculating the value of the payment.

⁴ Any payments made in currencies other than the report currency must be identified. The Reporting Entity may use the Additional notes row or the Notes column to identify any payments that are converted, along with the exchange rate and primary method used for currency conversions.

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¹ Enter the project that the payment is attributed to. Some payments may not be attributable to a specific project, and do not need to be disclosed in the “Payments by Project” table.

² When payments are made in-kind, the notes field must highlight which payment includes in-kind contributions and the method for calculating the value of the payment.

³ Any payments made in currencies other than the report currency must be identified. The Reporting Entity may use the “Additional Notes” row or the “Notes” column to identify any payments that are converted, along with the exchange rate and primary method used for currency conversions.