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Sigma Lithium to Release Third Quarter 2025 Earnings

Financials

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SIGMA LITHIUM TO RELEASE THIRD QUARTER 2025 EARNINGS

RESULTS ON NOVEMBER 14, 2025

SÃO PAULO, Oct. 1, 2025 - Sigma Lithium Corporation (TSXV/NASDAQ: SGML, BVMF: S2GM34) , a leading

global lithium producer dedicated to powering the next generation of electric vehicles with carbon neutral,

socially and environmentally sustainable lithium concentrate, announces today that it will release its third quarter

2025 earnings results before the market opens on Friday, November 14, 2025.

The Company will hold a conference call to discuss its third quarter 2025 earnings results shortly after, on

Friday, November 14, 2025, at 8:30 a.m. EST. Access to the call will be available via webcast. A link to the

webcast can be found through Sigma Lithium Corporation’s website at https://sigmalithiumcorp.com.

Webcast Details:

• Event Title: Sigma Lithium Third Quarter 2025 Earnings Results Call

• Event Date: November 14, 2025

• Start Time: 8:30 a.m. EST

Attendee URL:

https://mzgroup.zoom.us/webinar/register/WN_wNBpt5llQYyKaJmnZHOWnw

ABOUT SIGMA LITHIUM

Sigma Lithium (NASDAQ: SGML, TSXV: SGML, BVMF: S2GM34) is a leading global lithium producer dedicated

to powering the next generation of electric vehicle batteries with carbon neutral, 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 electric vehicle battery materials supply chain, producing Quintuple

Zero Green Lithium: net -zero carbon lithium made with zero dirty power, zero potable water, zero toxic

chemicals, and zero tailings dams.

Sigma Lithium currently produces 270,000 tonnes of lithium oxide concentrate on an annualized basis

(approximately 38,000–40,000 tonnes of LCE) at its state -of-the-art Greentech Industrial Lithium Plant. The

Company is now constructing a second plant to double production capacity to 520,000 tonnes of lithium oxide

concentrate (approximately 77,000–80,000 tonnes of LCE).

For more information about Sigma Lithium, visit our website

FOR ADDITIONAL INFORMATION PLEASE CONTACT

Anna Hartley, Vice President Investor Relations

[email protected]

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Sigma Lithium

Sigma Lithium

@sigmalithium

@SigmaLithium

FORWARD-LOOKING STATEMENTS

This news release includes certain “forward -looking information” 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 developm ents 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, includi ng whether mineral resources will ever be de veloped 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 labour

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 invol ves 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 ac tual 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 expectation s, please

refer to the current annual information form of the Company and other public filings available under the Company’s profile

at www.sedarplus.com.

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.