Ms. Ana Cabral reports

SIGMA LITHIUM RESUMES SALES OF HIGH-GRADE PREMIUM LITHIUM OXIDE; CLOSES INAUGURAL SALE AT PLANT OF 400,000T OF HIGH-PURITY LOW GRADE FINES EXPECTING A US$20 MILLION PROFIT

Sigma Lithium Corp. has resumed sales of high-grade premium lithium oxide in first quarter 2026, achieving industrial production cadence.

In the first quarter 2026, the company expects to generate gross revenues equivalent to the sale of approximately 28,000 tonnes of high-purity premium lithium oxide at a grade-adjusted price of approximately $1,712 (U.S.) per tonne. This performance reflects Sigma Lithium's ability of industrially beneficiating its dry-stacked tailings of fines, as well an existing inventory of raw materials into both premium high-grade lithium oxide and high-purity lithium fines.

The company has also executed its inaugural sale of 400,000 tonnes of high-purity lithium fines at the plant gate to be delivered on an ex-works EXW basis at a binding fixed price of $50 (U.S.) per tonne. This transaction is expected to generate approximately $20-million (U.S.) in profit.

Following this sale, Sigma Lithium retains an inventory of approximately 300,000 tonnes of high-purity lithium fines at its plant, which is expected to generate at least an additional $15-million (U.S.) in profit considering the robust conditions for the lithium market expected to prevail during the next few months. The commercialization of low-grade lithium fines by Sigma Lithium demonstrates a considerable sustainability reward and green premium to its shareholders.

Ana Cabral, co-chairperson of Sigma Lithium, said: "The resumption of sales of high-grade premium lithium oxide is in accordance with the outlook we highlighted at our investor presentations this year. By recovering, reprocessing and, thus, upgrading, through our proprietary Greentech technology, the previously untapped lithium materials idling at our dry stacked piles, Sigma Lithium delivered a direct financial return on its investment in the clean technology developed for its Greentech industrial plant's dry stacking processing module and reprocessing lithium circuits, while creating a permanent new business unit that increases the volume of high-purity lithium materials delivered to our customers, enhancing the diversification of our product portfolio.

Sigma Lithium's vice-president of business development, Marina Bernardini, said: "Our inaugural sales of high-purity lithium fines, delivered at the plant on an ex-works basis, confirms the profitability of these sales and highlights the potential for future cash flow to be generated from the remaining inventories of high-purity fines currently at the plant. They also further reinforce the sustainability reward for shareholders that we have demonstrated through successive profitable sales of these products."

About Sigma Lithium Corp.

Sigma Lithium is the largest producer of lithium oxide concentrate in the Americas and dedicated to industrializing socially and environmentally sustainable lithium materials to supply global producers of batteries for energy security.

The company operates one of the world's largest lithium production sites -- the fifth-largest industrial mineral complex for lithium oxide concentrate -- at its Grota do Cirilo operation in Brazil. Sigma Lithium is at the forefront of environmental and social sustainability in the electric battery material supply chain. The company's Greentech industrial plant combines dry stacking, the reuse of 100 per cent of water, zero use of toxic chemicals and the use of 100 per cent renewable electricity. For more than two years, Sigma Lithium has not experienced an accident with lost time.

Sigma Lithium currently has a nameplate capacity to produce 270,000 tonnes of lithium oxide concentrate on an annualized basis (approximately 38,000 to 40,000 tonnes of lithium carbondate equivalent) at its mine and state-of-the-art Greentech industrial plant. The company has initiated the construction of a second plant to double its production capacity.

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