Ms. Anna Hartley reports

SIGMA LITHIUM SELLS ADDITIONAL 100,000T OF HIGH PURITY LITHIUM FINES; MINING REMOBILIZATION PROCEEDING AS PLANNED; CATEGORICALLY RESPONDS TO INACCURATE MEDIA REPORTS

Sigma Lithium Corp. has sold an additional 100,000 tonnes of high-purity lithium fines. Sigma Lithium reiterates that the remobilization of the contractor for equipment and personnel at the site of its mine is proceeding as planned and is expected to conclude in January, 2026.

The company vehemently denies as "fake news" the inaccurate recent media reports that incorrectly denominated as an "operational injunction" an administrative process initiated by the Ministry of Labor and Employment. Sigma Lithium also states as categorically incorrect the media reports speculating about the status of the safety of its waste piles because of this administrative process, which does not represent a material event.

Sale of high-purity lithium fines

The company concluded the sale of 100,000 tonnes of high-purity lithium fines stored at the port of Vitoria at market prices (based on the Shanghai Metals Market (SMM) index). The price was equivalent to an adjusted net final price of $14 (U.S.) per tonne for 1 per cent of lithium oxide content (currently priced by SMM at $195 (U.S.) for 1.35 per cent).

Sigma Lithium highlights the proceeds of the high-purity fines sold as the green reward for the shareholders of the company, resulting from the company's investment in environmental state-of-the-art technologies at its Greentech plant, enabling it to dry stack its tailings and recycle the lithium contained by selling the high-purity fines. Therefore, Sigma Lithium has the most environmentally sustainable lithium processing industrial facility in the sector: combining dry stacking, the reuse of 100 per cent of water, the zero use of toxic chemicals in the processing of lithium and the use of 100 per cent renewable power for its electricity.

Inaccurate media reports

Sigma Lithium has recently been the subject of several inaccurate negative news articles, in what characterizes a well-orchestrated and well-financed on-line defamatory campaign, which has repeatedly made claims with respect to the company or its management that were false, inaccurate and misleading. The most recent articles, containing false statements about the Ministry of Labor and Employment's administrative enquiry into Sigma Lithium's waste piles as well as the safety of the company's waste piles, fit the defamatory pattern of this continuing "fake news on-line cancellation campaign": Approximately a month after the start of the enquiry and only two days after the company provided a positive update on operations on Jan. 13, 2026, a sudden onslaught of on-line defamatory false articles claiming that the company was "shut down" by the Ministry of Labor and Employment or even "by Brazil" were posted by "write-for-hire" on-line news outlets.

These claims have been mostly published by on-line outlets in Brazil with a business model that includes accepting sponsored content and were reposted globally by mainstream on-line outlets and news wires with a history of not engaging in fact checking. The seriousness of this latest defamatory campaign led to substantial volatility in Sigma Lithium's share price on Jan. 16, when trading volume was over four times its Nasdaq daily average. The resulting 30-per-cent drop in share price that day is likely to have benefited short sellers. The company has notified the appropriate authorities, including FINRA (Financial Industry Regulatory Authority) (U.S. Securities and Exchange Commission).

As part of this well-orchestrated and well-financed defamatory campaign, a fake website mimicking the official government website of the Ministry of Labor and Employment as well as official Brazilian government communications was created by the perpetrators of the campaign and circulated through a "ninja" social media campaign (phishing the government website by utilizing a different domain: ".org" versus the official ".gov.br"). Falsifying a government Web domain and government communications constitutes a serious crime in Brazil, punishable under federal law. The company has notified the appropriate authorities in the country.

Some of the mainstream media outlets, including Reuters and one of its reporters, have been legally notified by the company in the past for spreading inaccurate information. Another news outlet, Folha de Sao Paulo, has lost a defamation lawsuit moved by Sigma Lithium in 2025, when it published a false report by an NGO (non-governmental organization), Mongabay, also a respondent in the lawsuit. The publication Observatorio da Mineracao has also been legally notified by Sigma Lithium.

Brazil's Ministry of Labor and Employment opened an administrative enquiry with respect to the company's waste piles in mid-December following a regular inspection regarding health and safety. During the inspection, the Ministry of Labor and Employment had the opportunity of verifying the company's impeccable safety records, with over two years without labour accidents with lost time. Sigma Lithium's management considered this enquiry as not constituting material information when it was initiated, and this remains the case. The enquiry does not impact Sigma Lithium's ability to operate, including the continuing execution by the company of its mine remobilization.

The company's remobilization will maintain an estimated 19,000 direct and indirect jobs in the Jequitinhonha Valley, a purpose that fully aligns the Ministry of Labor and Employment, the government of Brazil, and Sigma Lithium. Sigma Lithium's commercial success has consolidated Brazil as a critical minerals leader, establishing the country in the global lithium supply chain of industrialized lithium oxide materials produced in an environmentally and socially sustainable manner to power the energy transition.

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, producing quintuple-zero green lithium: zero coal power, zero tailings dams, zero utilization of potable water, zero use of hazardous chemicals and zero accidents for over two years.

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 is now constructing a second plant to double its production capacity.

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