Ms. Catarina Noci reports

SIGMA LITHIUM ANNOUNCES ADDITIONAL SALE OF 150,000T PLUS 350,000T OPTIONAL OF HIGH PURITY LITHIUM FINES; PRODUCTION-BACKED REVOLVER OF US$96 MILLION

Sigma Lithium Corp. has sold 150,000 tonnes of high-purity lithium fines with 1 per cent of lithium oxide content (low-grade product) at a net final price of $140 (U.S.) per tonne.

Highlights:

• The company announces the sale of 150,000 tonnes of high-purity lithium fines at $140 (U.S.) upon warehouse delivery at the port of Vitoria. The agreement includes an option to sell an additional 350,000 tonnes at market prices.
• Sigma Lithium is pleased to report that the resumption of production cadence initiates client payments to the company under the working capital revolver (of $96-million (U.S.)) backed by 70,500 tonnes of high-grade lithium oxide concentrate to be supplied in 2026.

The same agreement gives the buyer an option to purchase an additional 350,000 tonnes of the low-grade product at market prices upon warehouse delivery at the port of Vitoria. The volume optionality ensures the flexibility to respond to robust market conditions for the low-grade product and customer requirements across the company's portfolio.

The commercial success of Sigma Lithium's low-grade product can potentially generate the equivalent proceeds of sales of 70,000 tonnes of Sigma Lithium's high-grade lithium oxide concentrate.

The sale of the low-grade product is the sustainability reward for the shareholders of the company: the successful commercialization is made possible by the quality of the low-grade product, which is industrialized using the innovative lithium dense media separation technology of Sigma Lithium's Greentech plant that preserves the chemical integrity of the lithium crystal structure.

As a result of the superior quality of the low-grade product, Sigma Lithium's clients achieved up to 60-per-cent recovery in reprocessing, obtaining lithium concentrate with over 4 per cent lithium oxide content (priced at approximately $1,370 (U.S.) per tonne currently on average by Shanghai Metals Market).

Production-backed revolver

The resumption of production cadence of the high-grade lithium concentrate triggers the commencement of prepayments under the revolver facility of $96-million (U.S.), strengthening Sigma Lithium's near-term liquidity.

The unsecured binding agreement signed with a leading company in the battery materials supply chain provides for the supply of 70,500 tonnes of high-grade lithium concentrate by Sigma Lithium during 2026. Under the terms, each prepayment's fixed instalment of $8-million (U.S.) occurs 30 days prior to production and delivery to the Port of Vitoria of an agreed-upon quantity. The first prepayment was disbursed, as previously announced, on Jan. 13. Each prepayment carries an interest of SOFR (secured overnight financing rate) plus 1 per cent for 30 days until final sale upon delivery to the port of Vitoria.

The pricing of each sale is determined to match the prevailing spot market price for high-grade lithium concentrate, as per the major indexes, preserving full exposure to price upside and demonstrating a disciplined sales approach as lithium market fundamentals continue to improve.

Catarina Noci, Sigma Lithium's vice-president of commercial, said: "This production-backed revolving agreement reflects our clients' confidence in Sigma Lithium's ability to deliver consistent high-grade lithium concentrate volumes at scale. It builds on a relationship that has developed steadily over time and underscores our role in the lithium supply chain. It follows more than a year of commercial collaboration through our trading partners, during which we have supplied high-grade lithium concentrate to support the client's businesses. It speaks to the reliability and quality of our product as well as to the strength of the partnership we have established."

Marina Bernardini, Sigma Lithium's vice-president of business development, said: "Our sequential sales of the low-grade product show how this material can generate recurring value, demonstrating its marketability. Continuous demand for the low-grade product has supported the creation of an additional revenue stream for the company. This opportunity stems from both our large existing inventory of low-grade product available for reprocessing and the ongoing annual generation of approximately 300,000 tonnes of this material through our Greentech plant's dry stacking technology. Our sustainability-centred relationships are mutually beneficial as our clients generate additional value by concentrating our low-grade product into higher-grade lithium material."

About Sigma Lithium Corp.

Sigma Lithium is a leading global lithium producer dedicated to powering the next generation of electric batteries with socially and environmentally sustainable lithium oxide concentrate.

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 materials 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 carbonate 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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