Ms. Anna Hartley reports

SIGMA LITHIUM'S 3Q 25 RESULTS: INCREASE IN REVENUES AND CASH POSITION

Sigma Lithium Corp. has released its results for the third quarter ended Sept. 30, 2025.

Highlights:

• Sigma Lithium's net revenue increased by 69 per cent quarter over quarter and 36 per cent year over year as it commercially partnered with its clients and leaned on their balance sheets, efficiently navigating lithium price fluctuations;
• Generated $24-million (U.S.) from final price settlements of sales concluded by Q3 2025, with an additional cash generation of approximately $4-million (U.S.) expected from incremental settlements;
• Additionally, $33-million (U.S.) is expected from the sale of 950,000 tonnes of high-purity lithium materials (middlings) that can be reprocessed by clients;
• Mining operations are expected to restart by the end of November and achieve a full ramp-up by Q1 2026 with upgraded equipment leased directly from manufacturers at low rates and directly managed and operated by Sigma Lithium;
• Maintained financial discipline and continued to deleverage; short-term (high-interest) trade finance debt was decreased by 48 per cent during the year till November, 2025.

Conference call information

The company will hold a conference call to discuss its financial results for the third quarter of 2025 at 8:30 a.m. ET on Friday, Nov. 14, 2025. Register for the call on Sigma Lithium's website.

Substantial revenue growth

Sigma Lithium reported net revenues of $28.5-million (U.S.) for Q3 2025, representing substantial increases of 69 per cent quarter over quarter and 36 per cent year over year. The increases reflected a successful commercialization strategy, which enabled the company to maximize seasonal lithium price variations and lock gains, enabled by the company's provisional pricing strategy. The increase on a quarter-over-quarter basis also reflected better sales volumes, which rose 21 per cent primarily because in the previous quarter, in line with Sigma Lithium's disciplined commercial strategy, the company temporarily withheld product from the market during periods of intense price volatility to preserve pricing power and protect long-term margins.

Mining operations upgraded to match Greentech industrial plant 3.0

Following the upgrade in the Greentech industrial plant last year in November, 2024, it has been recurringly delivering unprecedent recovery levels since January, 2025, with over 70 per cent at plant level. As a result, in 2026, the company plans to reach the full Greentech industrial plant capacity of 300,000 tonnes, already achieved in Q4 2024.

As a result, the company's medium-term mine plan was extensively reviewed throughout the year: Initiatives to assess the upgrade in mining operations currently in execution include the increase in the size of the mining equipment (double the capacity of trucks and excavators) and full digitalization of controls in mining operations, including fleet and diesel. Sigma Lithium took over the mining operations from a previous equipment contractor and plans to be leasing equipment directly from manufacturers, financing this upgrade through offtake agreements in Asia, with low interest rates. The company expects mining operations to resume by the end of November, achieving a full ramp-up by Q1 2026.

Significant improvement in cash position in contrast to peers

As of Sept. 30, 2025, the company's had cash and cash equivalents of $6.1-million (U.S.) in addition to $20-million (U.S.) from trade receivables booked in the quarter totalling $26.1-million (U.S.).

Currently, as of Nov. 13, 2025, Sigma Lithium converted the trade account receivables into $21-million (U.S.) in cash and benefited from an $8-million (U.S.) increase in the value of certain settled trade receivables sold by the end of Q2 2025, totalling $29-million (U.S.) representing a significant improvement in the company's liquidity.

Additionally, the company has the opportunity to monetize its high-purity reprocessed lithium materials (middlings) in the robust lithium market environment during this quarter.

Deleveraged by decreasing trade finance short-term debt

During 2025, Sigma Lithium has substantially deleveraged by reducing its expensive short-term trade finance by 38 per cent to $37-million (U.S.) as of Sept. 30, 2025. Additionally, the company continued to execute this strategy planning to decreasing the trade finance debt by 60 per cent to Nov. 30, 2024.

About Sigma Lithium Corp.

Sigma Lithium is a leading global lithium producer dedicated to powering the next generation of batteries for electric vehicles and energy storage systems with socially and environmentally sustainable chemical-grade lithium concentrate.

The company operates one of the world's largest lithium production sites -- the fifth-largest industrial mineral complex for lithium oxide -- at its Grota do Cirilo operation in Brazil. Sigma Lithium is at the forefront of environmental and social sustainability in the battery materials supply chain, producing quintuple-zero green lithium: made with zero coal power, zero tailings dams, zero utilization of potable water, zero use of hazardous chemicals and zero accidents.

Sigma Lithium currently produces 270,000 tonnes of lithium oxide concentrate on an annualized basis (approximately 37,000 tonnes of LCE (lithium carbonate equivalent) at its state-of-the-art Greentech industrial lithium plant. The company is now constructing a second plant to more than double production capacity to approximately 80,000 tonnes of LCE per year.

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