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SIGMA LITHIUM CORPORATION

UNAUDITED CONDENSED

INTERIM CONSOLIDATED

FINANCIAL STATEMENTS

FOR THE NINE-MONTH PERIODS

ENDED SEPTEMBER 30, 2025 AND 2024

(EXPRESSED IN THOUSANDS OF UNITED STATES DOLLARS)

MANAGEMENT'S RESPONSIBILITY FOR FINANCIAL REPORTING

The accompanying unaudited condensed interim consolidated financial statements of Sigma Lithium Corporation (the "Company") are the responsibility of management and have been approved by the Company's Board of Directors (the "Board").

The unaudited condensed interim consolidated financial statements have been prepared by management on a going concern basis in accordance with International Accounting Standard 34 Interim Financial (“IAS 34”) as issued by the International Accounting Standards Board. When alternative accounting methods exist, management has chosen those it deems most appropriate in the circumstances. Financial statements are not exact since they include certain amounts based on estimates and judgments. Management has determined such amounts on a reasonable basis in order to ensure that the financial statements are presented fairly, in all material respects.

The Board is responsible for ensuring that management fulfills its responsibilities for financial reporting and is ultimately responsible for reviewing and approving the financial statements. The Board carries out this responsibility principally through its Audit Committee.

The Audit Committee is appointed by the Board, and all of its members are independent directors. The Audit Committee meets at least four times a year with management, and with the external auditors, to discuss internal controls over the financial reporting process, auditing matters and financial reporting issues, to satisfy itself that each party is properly discharging its responsibilities, and to review the quarterly and the annual reports, the unaudited condensed interim consolidated financial statements and the external auditor’s reports. The Audit Committee reports its findings to the Board for consideration when approving the unaudited condensed interim consolidated financial statements for issuance to the shareholders. The Audit Committee also considers, for review by the Board and approval by the shareholders, the engagement or reappointment of the external auditors.

"Ana Cristina Cabral"

Chief Executive Officer and Co-Chairperson

"Felipe Resende Peres"

Chief Financial Officer

1.       Corporate information

Sigma Lithium Corporation (the “Company” or “Sigma Lithium” or “Sigma”), together with its direct and indirect subsidiaries, is a commercial producer of lithium oxide concentrate.

These unaudited condensed interim consolidated financial statements include the Company’s wholly owned subsidiary Sigma Lithium Holdings Inc. (“Sigma Holdings”), which is domiciled in Canada and incorporated under the Business Corporations Act (British Columbia), and its indirect wholly-owned subsidiaries incorporated in Brazil, Sigma Mineração S.A. (“Sigma Brazil”) and Sigma Industrial de Lítio S.A (“Sigma Industrial”).

Sigma Brazil holds a 100% interest in four mineral properties: Grota do Cirilo, São José, Santa Clara, and Genipapo, located in the municipalities of Araçuaí and Itinga, in the Vale do Jequitinhonha region (referred as thereafter as “Jequitinhonha Valley”) in the State of Minas Gerais, Brazil (together, the “Lithium Properties”), where our operating assets are located.

The Company’s common shares commenced trading on the TSX Venture Exchange (the “TSXV”) on May 9, 2018, under the symbol “SGML” (formerly “SGMA”) and on September 13, 2021, on Nasdaq Capital Market (“Nasdaq”), the symbol was unified to “SGML”. On July 24, 2023, Sigma Lithium began trading its unsponsored Brazilian Depositary Receipts (“BDR’s”) on B3, the Brazilian Stock Exchange. Unsponsored BDRs are issued by depository institutions without the participation of the foreign companies that issued the backing securities, being classified only as Level I Unsponsored BDRs.

2.       Basis of preparation

The unaudited condensed interim consolidated financial statements of the Company have been prepared in accordance with IFRS Accounting Standards applicable to the preparation of interim financial statements, under International Accounting Standard 34, Interim Financial Reporting. Accordingly, certain disclosures included in the Company’s annual unaudited consolidated financial statements prepared in accordance with IFRS Accounting Standards as issued by the International Accounting Standards Board (“IFRS Accounting Standards”) have been condensed or omitted. These unaudited condensed interim consolidated financial statements should be read in conjunction with the Company’s annual consolidated financial statements for the year ended December 31, 2024, ("2024 Annual Financial Statements").

These unaudited condensed interim consolidated financial statements have been prepared under the historical cost method, except for certain financial instruments measured at fair value.

All the amounts presented in United States Dollars (“US$”) have been translated from the Company's functional currency and may contain immaterial rounding.

As a result, the following explanatory notes are not repeated in this interim financial information either due to redundancy or materiality in relation to those previously presented in the annual financial statements:

The unaudited condensed interim consolidated financial statements were approved by the Board on November 14, 2025.

2.1.   Transactions eliminated on consolidation

Intra-group balances and transactions, as well as any unrealized income and expenses arising from intra-group transactions, are eliminated.

2.2.   Functional currency

The Company's functional currency is the currency of the primary economic environment in which it operates and that best reflects its business and operations. The Company’s operations are held by the Brazilian subsidiary, Sigma Mineração S.A., which provides the entirety of the inflows and outflows of the Company, including any dividends to be remitted. The Parent Company in Canada is a pure holding company with no operations and depends on the Brazilian subsidiary to provide its cash flow. The prices of the lithium commodity are globally referenced in U.S. dollars to provide reference for market players located in different countries and different currencies. Consequently, the Company’s revenues are translated into the Brazilian Real, which is the currency that most of the costs for supplying products or services are incurred and which the costs are normally expressed and settled. Accordingly, the Company’s functional currency is the Brazilian Real ("R$").

2.3.   Presentation currency of the financial statements

On January 1, 2025, the Company elected to change its presentation currency from Canadian Dollars (“CAD”) to United States Dollars (“US$”). This change was made to better reflect the Company’s business operations and to enhance the comparability of its financial results with those of other publicly traded companies in the mining industry. The change in presentation currency has been applied retrospectively, and comparative financial information has been restated as though US$ had always been the Company’s presentation currency, in accordance with IAS 21 and IAS 8 - Accounting Policies, Changes in Accounting Estimates and Errors.

For reporting periods prior to January 1, 2025, the statements of financial position have been translated from the functional currency (R$) to the new presentation currency (US$) using the exchange rates prevailing at each respective reporting date. Equity items, however, have been translated using historical accumulated rates dating back to the Company’s incorporation in 2018. The statements of income / (loss) and comprehensive income / (loss) were translated at average exchange rates for each reporting period, or at the rate prevailing on the date of the transaction. Exchange differences arising from the translation of 2024 financial information from R$ (functional currency) to US$ (presentation currency) have been recognized in other comprehensive income / (loss) and accumulated in a separate component of equity.

In compliance with IFRS Accounting Standards, the Company also presented a third statement of financial position as of January 1, 2024. Equity balances were restated using historical average exchange rates, except for significant transactions, which were translated using the actual historical rates. Any resulting differences were recorded as adjustments to the foreign currency translation reserve.

As of September 30, 2025, the main exchange rates used by the Company to convert the financial information with a currency different from functional currency were as follows: US$1.00 was equivalent to R$5.3186 (R$6.1923 on December 31, 2024) and CAD$1.00 was equivalent to R$3.8186 (R$4.3047 on December 31, 2024), based on the rates published by the Central Bank of Brazil.

2.4.   Going concern

Management understands that the actions being currently undertaken to obtain additional funding and implement its strategy, including making changes to its mains suppliers, enable it for the Company to continue as a going concern.

During the period ended September 30, 2025, the Company presented a negative working capital of $65,520, accumulated losses of $252,688¹ and incurred a net loss of $25,706.

The Company’s ability to continue as a going concern is dependent upon management’s ability to successfully execute its business plan, which includes increasing revenues while controlling operating expenses, as well as, generating operational cash flows and continuing to maintaining support from outside sources of financing, while managing the uncertainty brought by the volatility in lithium markets.

¹Include $151,462 of Stock Based Compensation which did not impact cash flow of the Company. 

3.       Cash and cash equivalents

Cash and cash equivalents include the following:

In 2024, the Company held short-term investments abroad (denominated in United States Dollars) with an approximate yield of 3.76% p.a., and fixed income investments, with immediate liquidity, yielding 98.2% p.a. of the Brazilian interbank deposit certificate (“CDI”). As of September 30, 2025, the Company has terminated its financial investment positions are in line with evolving liquidity and strategic priorities.

4.       Trade accounts receivable

The Company's operations include accounts receivable where the final selling price is established days after initial revenue recognition and product delivery.

The trade accounts receivable is subject to significant market price fluctuations until the final selling price is settled. The Company monitors the futures market for lithium to estimate the final prices when the quotational periods of the contracts close. As a result, accounts receivable as of September 30, 2025, have been estimated and adjusted based on relevant forward market prices (see Note 22). Any fluctuations in the value of these receivables are reflected in the Company's sales revenue.

5.       Inventories

Spare parts refer to components and equipment used in the short-term maintenance of machinery and equipment. As of September 30, 2025, the Company has not identified any need to recognize losses on slow-moving inventory.

6.       Advance to suppliers

As of September 30, 2025, the Company had outstanding balances for advances with domestic and foreign suppliers in the amount of $6,822 ($9,727 on December 31, 2024), for the acquisition of operating consumables.

7.       Recoverable VAT and other taxes

The outstanding balance of recoverable federal taxes is expected to be recovered within the next 24 months, based on analysis and budget projections approved by management. Regarding the recoverable ICMS (state VAT), the Company expects to recover them in about two years.

8.       Cash held as collateral

As of September 30, 2025 and December 31,2024, the Company had advanced $12,686 as collateral related to the obligation to pay interest on export prepayment contract loans for the development of an industrial plant (Note 13). The amounts are determined based on the interest paid on the loan over the last twelve months established in the loan agreement. The settlement of the collateral will occur at the maturity of the agreement together with its final settlement.

9.       Property, plant and equipment

a) The average estimated useful lives are as follows (in years):

b) Assets under construction

In 2024, the Company began investments related to the Phase 2 capacity expansion, with capital expenditures for the project totaling $7,903 in 2025 ($2,372 as of December 31, 2024). Initially, accumulated expenditures are classified as construction in progress and will be reclassified to the appropriate asset categories upon completion of the operational plant. Additionally, the Company continued to invest into Phase 1 operational infrastructure, with related expenditures classified as construction in progress and reclassified to the respective asset categories as each infrastructure initiative is completed.

c) Right-of-use assets

Right-of-use assets include land, machinery, and equipment provided exclusively for the Company’s use on-site. The Company considers as right-of-use those contracts longer than 12 months in which assets have individual amounts greater than $5.

d) Depreciation and depletion

The allocation of depreciation costs incurred as of September 30, 2025 and December 31, 2024, is shown below:

10.        Deferred exploration and evaluation expenditure

A summary of exploration costs is set out below:

11.        Related parties’ transactions

A summary of related parties is set out below:

a) Transactions with related parties

Cost sharing agreements (“CSAs”): The Company has a CSA with A10 Advisory, whereby strictly the following expenses are reimbursed: (i) the cost of administrative personnel that is 100% allocated to Sigma Lithium; (ii) the rental of Sigma Lithium’s office space, which was formerly occupied and until recently paid by A10 Advisory, and is now fully utilized by Sigma Lithium; and (iii) health insurance expenses of former A10 Advisory staff, now employed only by Sigma Lithium, which continue to be paid by A10 Advisory. Marcelo Paiva does not receive any compensation or benefits as part of such CSA.

Leasing Agreements: The Company has right-of-way lease agreements with Miazga and Arqueana relating to access to the industrial plant (See note 14).

Royalties: Pursuant to Brazilian legislation, royalties are payable to landowners whose properties are subject to mineral exploration activities. The valuation of the amount must be equivalent to 50% of the value paid as Financial Compensation for the Exploration of Mineral Resources (CFEM). As of September 30, 2025, the Company recognized an amount of $1,702 ($951 as of December 31, 2024) to be paid to Miazga, of which $537 was settled during the first half of 2025.

Accounts receivable (Tatooine): On April 20, 2023, Sigma Brazil entered into a facility agreement with Tatooine, to fund Tatooine’s purchase of multiple properties located in areas of interest of the Company. The facility agreement provides the loan of an amount up to $12,000. On November 14, 2024, the Company entered into a contractual amendment with an increase in the loan limit to $15,000, bearing 15% p.a. interest rate. The facility agreement is to be made available upon utilization requests made by Tatooine to Sigma Brazil, specifying the amount to be utilized by Tatooine for the acquisition of each property and its corresponding expected costs and expenses. The loan granted by Sigma Brazil to Tatooine under the Facility Agreement totaled $18,491 as of September 30, 2025 ($12,953 as of December 31, 2024), of which $13,875 ($12,795 as of December 2024) represents loan disbursements and $4,621 ($2,566 as of December 2024) corresponds to capitalized interest. During the nine-month period ended September 30, 2025, Tatooine requested $1,080 to acquire properties located over the Company’s mining rights.

Instituto Lítio Verde (“ILV”): Sigma Brazil and ILV are parties in the development of a major lithium mining project with a high degree of positive impact in the communities surrounding the Company’s operations at the Vale do Jequitinhonha. ILV’s purpose is to promote the well-being and the development of those communities.

Transactions with related parties

b) Key management personnel

The compensation paid or payable to key management for employee services is shown below:

Key management includes the directors of the Company, the executive management team and senior management at Sigma Brazil.

12.        Suppliers

13.        Loans and export prepayment

The balances of loans and export prepayments are recognized at the amortized cost and are detailed as follows:

As of September 30, 2025, the principal amount of short-term and long-term loans and export prepayments of the Company by maturity year, adjusted for interest and exchange variation, before transaction costs, are as follows:

The Reais denominated amounts refer to the loans from Banco de Desenvolvimento de Minas Gerais (BDMG) and the U.S dollar denominated amounts refer to the short-term and long-term export prepayment.

The table below shows the changes in the Company’s loans and export prepayments during the periods:

Export Prepayment Trade Finance

During the year ended December 31, 2024, the Company entered into export prepayment agreements with financial institutions for a total of $171,778. These agreements have maturities ranging from 90 to 360 days and carry interest rates between 7.0% p.a. and 10.5% p.a. Additionally, the Company repaid $121,742 in export prepayment agreements, the maturities which occurred during the year.

For the nine months ended September 30, 2025, the Company entered into export prepayment agreements with financial institutions for a total amount of $48,958. These agreements have maturities ranging from 30 to 180 days and bear interest rates between 9.0% p.a. and 10.7% p.a. Additionally, the Company repaid $74,807 related to export prepayment agreements that matured during this period.

Export Prepayment Agreement – Synergy

On December 13, 2022, the Company, through Sigma Brazil, entered into an export prepayment agreement in the amount of $100 million, with annual interest payments based on the 12-month Bloomberg short-term bank yield index (“BSBY”) plus 6.95% per annum and maturing on December 13, 2026. On December 13, 2022, Sigma Brazil drew down $60 million. The balance of $40 million was disbursed in two subsequent drawdowns of $20 million each, on February 28, 2023, and on March 16, 2023.

The Company paid at the inception of the agreement $12,686 (Note 8) as collateral, based on an amount equal to twelve months of interest accrual for the first interest period, and an upfront fee of $2,964. Principal repayments of the Loan are due 48 days after the end of the Company’s first and third quarters ending March 31 and September 30, respectively, each year, being the first measurement date, the third quarter ended September 30, 2023. Repayments will be determined based on an amount equivalent to 50% of the Company’s net cash generated from operating activities plus 50% of the net cash generated from investing activities for the prior six-month period ended March 31 and September 30.

The loan contains an embedded prepayment feature, whereby the Company must pay an early prepayment premium of 4% during the first year of the loan, reducing proportionately from 4% to 1% after the first anniversary, finishing at 1% at the end of the fourth year. The fair value of this embedded derivative has been estimated and does not differ significantly from the nominal amount and, accordingly, no adjustments were made, since it is closely related to the primary indexation of the loan.

The loan is guaranteed by the Company's assets, rights, licenses, receivables, contracts (with flexibility to enter/terminate/amend offtake agreements) and a pledge of 100% of Sigma Lithium Holdings Inc’s share interest in Sigma Brazil. The security will rank first in respect to all existing and future indebtedness of the Company, except in relation to permitted indebtedness of up to $100 million and R$100 million.

As of November 15, 2024, the Bloomberg Short-Term Bank Yield Index (BSBY) was discontinued. In response to this change, the Company transitioned to using the 12-month Secured Overnight Financing Rate (SOFR) as our benchmark rate. For interest payments after December 2024, the new rate applied will be SOFR + 6.95%.

In the nine-month period ended September 30, 2025, the Company recognized interest expense on this contract in the amount of $8,402 ($9,414 as of September 30, 2024).

a) Banco de Desenvolvimento de Minas Gerais - BDMG

The Company entered into a financing agreement with BDMG. The first tranche of $3,084 was received on January 13, 2023, and $768 on November 14, 2023. This financing entails quarterly interest payments and includes a 24-month grace period for principal amortization. Principal repayment occurs over 60 monthly installments, with the first installment due on December 15, 2024. The financing carries an annual interest rate of Sistema Especial de Liquidação e Custodia SELIC+3.75%.

On October 24, 2023, the Company entered into another financing agreement with BDMG for $9,449, the first tranche of $8,607 was received in December 2023 and second tranche of $789 received in May 2024. Like the previous agreement, this financing involves quarterly interest payments and a 24-month grace period for principal amortization. Principal repayment is scheduled over 60 monthly installments, with the first installment due on December 7, 2025. The interest on this loan is SELIC+3.88% per annum.

Additionally on May 9, 2024, the Company entered into another financing agreement with BDMG for $8,234. Like the previous agreement, this financing involves quarterly interest payments and a 24-month grace period for principal amortization. Principal repayment is scheduled for over 60 monthly installments, with the first installment due on May 30, 2026. The interest of this loan is SELIC+3.93% per annum.

In the nine-month period ended September 30, 2025, the Company recognized an interest expense on this contract in the amount of $2,018 ($1,332 as of September 30, 2024).

b) Banco Nacional de Desenvolvimento Econômico e Social - BNDES

On October 10, 2024, Sigma Lithium signed the final agreement securing a R$486,800 development loan from the National Brazilian Bank for Economic and Social Development (“BNDES”) to fund the construction of a second Greentech carbon neutral industrial plant for lithium oxide concentrate at Vale do Jequitinhonha in Brazil. The Company is required to provide a letter of credit (“bank guarantee”) issued by a BNDES registered financial institution in advance of first drawdown. As of September 30, 2025 the Company has not recorded any drawdowns from BNDES.

As of September 30, 2025 the Company is in compliance with all debt covenants.

14.        Lease liability

The lease liabilities are primarily related to the land leases owned by Miazga Participações S.A. (“Miazga”) and Arqueana, a related party (note 11), while the remaining lease contracts relate to land, apartments and houses, commercial spaces, operational equipment, and vehicle leases with third parties.

The lease agreements have terms between 1 year to 12 years and the liability was measured at the present value of the lease payments discounted using interest rates, with a weighted average rate of 10.72% which was determined to be the Company’s incremental borrowing rate.

The changes in lease liabilities are shown in the following table:

Maturity analysis - contractual discounted cash flows

15.        Prepayment from customer

Refers to payments made in excess due to the provisional pricing applied at the time of invoicing, with the final amount subject to adjustments based on all variable pricing elements outlined in the sales contract. As of September 30, 2025, the outstanding balance was $4,178 ($1,514 as of December 31, 2024).

16.        Taxes payable

⁽¹⁾ During 2025 3rd Quarter, the Company identified inconsistencies in its tax ancillary obligations related to prior years (mostly 2022 and 2023) regarding the non-fulfillment of certain requirements and deadlines set by tax legislation. To rectify its situation with the tax authorities and demonstrate full compliance with legal obligations, the Company took a proactive approach by voluntarily disclosing the issue to the relevant authorities. The amounts related to this voluntary disclosure will be paid in 60 installments, comprising $1,360 of principal, $672 in interest and fines.

On October 4, 2024, the Northeast Development Authority – “SUDENE” approved Sigma Brazil the tax benefit of a 75% reduction in income tax, also known as Profit from Exploration, and issued the Constitutive Report. This tax benefit allows the Company to reduce its current income tax payment by approximately 75%, starting in 2024, for the next ten years. The amount saved will be transferred to a reserve account for tax incentives within the equity accounts and cannot be distributed to the shareholders. For the nine-months ended September 30, 2025, the Company recognized a reserve for tax incentives in the amount of $174 ($2,500 as of December 31, 2024) - see note 20.d.

17.        Income tax and social contributions

a) Current income tax and social contribution recognized in profit or loss

The income tax and social contribution recognized in profit or loss are as follows:

The reconciliation of Company income tax and social contribution expenses and the result from applying the effective rate to profit before income tax and social contribution is shown below. The Company operates in the following tax jurisdictions: Brazil, where the corporate tax rate is 34% and Canada, where the federal corporate tax rate is 15% with varying provincial tax rates, such as British Columbia’s 12% tax rate, which totals 27% income tax rate applicable to Sigma in Canada:

The amount of $13,885 as of September 30, 2025 ($12,548 as of December 31, 2024) of tax loss carryforward generated in Canada by the Company has not been recognized since we do not expect to have taxable income to offset it. This tax loss carryforward expires between 2039 and 2044.

b) Deferred income tax and social contribution:

The deferred income tax and social contribution are calculated on tax loss carryforwards and the temporary differences between the tax bases of assets and liabilities and their carrying amounts.

The Company expects to realize the deferred tax assets within two years.

18.        Asset retirement obligations (“ARO”)

The balance of provisions for assets retirement obligations is as follows:

The changes in asset retirement obligations are shown in the following table:

19.        Financial instruments

a) Identification and measurement of financial instruments

The Company enters into transactions involving various financial instruments, mainly cash and cash equivalents, including short-term investments, accounts receivable, accounts payable to suppliers, and loans and export prepayment, which may contain embedded derivatives.

The amounts recorded in current assets and current liabilities have immediate liquidity or short-term maturity, mostly less than three-months. Considering the maturities and features of such instruments, their carrying amounts approximate their fair values.