<div id="readability-page-1"><article>São Paulo, Brazil--(Newsfile Corp. - May 5, 2026) - Sigma Lithium Corporation (TSXV: SGML) (NASDAQ: SGML) (BVMF: S2GM34), (&#34;Sigma Lithium&#34; or &#34;the Company&#34;), a leading global lithium producer dedicated to powering the next generation of electric batteries with socially and environmentally sustainable lithium concentrate, announces today that it will release its first quarter 2026 earnings results before the market opens on Friday, May 15, 2026.The Company will hold a conference call to discuss its first quarter 2026 earnings results shortly after, on Friday, May 15, 2026, at 8:30 a.m. EST. Access to the call will be available via webcast. A link to the webcast can be found on Sigma Lithium's website at:https://ir.sigmalithiumcorp.com/events/Webcast Details:<ul><li>Event Title: Sigma Lithium First Quarter 2026 Earnings Results Call</li><li>Event Date: May 15, 2026</li><li>Start Time: 8:30 a.m. EST</li></ul>Attendee URL: https://mzgroup.zoom.us/webinar/register/WN_US0MoDbgTVyJLtNCQeZrIQ#/registrationABOUT SIGMA LITHIUMSigma Lithium Corporation (NASDAQ: SGML) (TSXV: SGML) (BVMF: S2GM34), (&#34;Sigma Lithium&#34; or &#34;the Company&#34;) is the largest producer of lithium oxide concentrate in the Americas¹ and dedicated to industrializing socially and environmentally sustainable lithium materials to supply global producers of batteries for energy security.The Company runs 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 the reuse of 100% of water, zero use of toxic chemicals, zero tailings and the use of 100% 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 38,000-40,000 tonnes of LCE) at its mine and state-of-the-art Greentech Industrial Plant. The Company has initiated a Phase 2 expansion designed to close to double production capacity to 520,000 tonnes. For more information about Sigma Lithium, visit our website.(1) USGS.Sigma LithiumLinkedIn Instagram XFORWARD-LOOKING STATEMENTSThis news release includes certain &#34;forward-looking information&#34; under applicable Canadian and U.S. securities legislation, including but not limited to statements relating to timing and costs related to the general business and operational outlook of the Company, the environmental footprint of tailings and positive ecosystem impact relating thereto, donation and upcycling of tailings, timing and quantities relating to tailings and Green Lithium, achievements and projections relating to the Zero Tailings strategy, achievement of ramp-up volumes, production estimates and the operational status of the Grota do Cirilo Project, and other forward-looking information. All statements that address future plans, activities, events, estimates, expectations, or developments that the Company believes, expects, or anticipates will or may occur is forward-looking information, including statements regarding the potential development of mineral resources and mineral reserves which may or may not occur. Forward-looking information contained herein is based on certain assumptions regarding, among other things: general economic and political conditions; the stable and supportive legislative, regulatory and community environment in Brazil; demand for lithium, including that such demand is supported by growth in the electric vehicle market; the Company's market position and future financial and operating performance; the Company's estimates of mineral resources and mineral reserves, including whether mineral resources will ever be developed into mineral reserves; and the Company's ability to operate its mineral projects including that the Company will not experience any materials or equipment shortages, any labor or service provider outages or delays or any technical issues. Although management believes that the assumptions and expectations reflected in the forward-looking information are reasonable, there can be no assurance that these assumptions and expectations will prove to be correct. Forward-looking information inherently involves and is subject to risks and uncertainties, including but not limited to that the market prices for lithium may not remain at current levels; and the market for electric vehicles and other large format batteries currently has limited market share and no assurances can be given for the rate at which this market will develop, if at all, which could affect the success of the Company and its ability to develop lithium operations. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking information. The Company disclaims any intention or obligation to update or revise any forward-looking information, whether because of new information, future events or otherwise, except as required by law. For more information on the risks, uncertainties and assumptions that could cause our actual results to differ from current expectations, please refer to the current annual information form of the Company and other public filings available under the Company's profile at www.sedarplus.ca.Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release.<img id="corporateNewsLogo" src="https://imageproxy.pbkrs.com/https://images.newsfilecorp.com/files/12012/296065_c1eadb0d14145876_logo.jpg?x-oss-process=image/auto-orient,1/interlace,1/resize,w_1440,h_1440/quality,q_95/format,jpg" width="200" height="109" original-src="https://imageproxy.pbkrs.com/https://images.newsfilecorp.com/files/12012/296065_c1eadb0d14145876_logo.jpg"/>To view the source version of this press release, please visit https://www.newsfilecorp.com/release/296065<img src="https://imageproxy.pbkrs.com/https://api.newsfilecorp.com/newsinfo/296065/375?x-oss-process=image/auto-orient,1/interlace,1/resize,w_1440,h_1440/quality,q_95/format,jpg" width="1" height="1" original-src="https://imageproxy.pbkrs.com/https://api.newsfilecorp.com/newsinfo/296065/375"/></article></div>

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Sigma Lithium Corporation (TSXV: SGML) (NASDAQ: SGML) will release its first quarter 2026 earnings results on May 15, 2026, before market opening. A conference call will follow at 8:30 a.m. EST to discuss the results, accessible via webcast. Sigma Lithium is a leading lithium producer focused on sustainable practices, with a current production capacity of 270,000 tonnes of lithium oxide concentrate and plans for expansion to 520,000 tonnes. The company emphasizes environmental sustainability in its operations, including zero tailings and renewable energy use.

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Sigma Lithium to Release First Quarter 2026 Earnings Results on May 15, 2026 | SGML Stock News