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Sigma Lithium Ends Transformational Year Shipping 22,000t of the Most Environmentally Sustainable Lithium IN World; Greentech Plant Operating at Design Capacity of 270,000 Tpy

Corporate Updates

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SIGMA LITHIUM ENDS TRANSFORMATIONAL YEAR SHIPPING

22,000t OF THE MOST ENVIRONMENTALLY SUSTAINABLE

LITHIUM IN WORLD; GREENTECH PLANT OPERATING AT

DESIGN CAPACITY OF 270,000 TPY

HIGHLIGHTS

• Delivers pivotal milestone: Greentech plant sustains production at design capacity of 270,000

tonnes per year for the month of December.

• Sigma Lithium has commenced loading its next 22,000 tonne shipment of its unique, sustainable,

lithium concentrate to Glencore at the Port of Vitoria.

o Glencore to prepay 50% for the shipment at a provisional premium price.

• Company fully achieves the mission of its Impact Investors at IPO: Produce lithium materials

aligned with the ethos of the environmentally conscious consumer of the electric vehicle.

• Sigma Lithium has managed to industrialize a unique Quintuple Zero Green Lithium concentrate

(“Quintuple Zero Lithium”), recognized at COP28 as the most sustainable lithium in the world.

▪ ZERO Net Carbon: First large-scale producer in the lithium industry to achieve

carbon neutrality.

▪ ZERO Coal Power at Greentech Plant: 100% renewable power.

▪ ZERO Tailings Dams: 100% dry stacked tailings, 100% reused.

▪ ZERO Utilization of Potable Water: Sewage treatment for solid fecal residues for

Greentech plant inbound water.

▪ ZERO Use of hazardous chemicals in manufacturing process of lithium

concentrate.

• Continues to advance its growth plans, leveraging its competitive advantages as a low-cost

producer of a technically superior coarse granulated Quintuple Zero Lithium

o Exploration updates expected to expand mineral resource on Grota do Cirilo Property

▪ Phase 4: approximately increases Sigma Lithium total M & I & I to 110Mt.

▪ Phase 5: approximately increases M & I & I an additional 20Mt.

• Planned initiation of earthworks for Greentech Plant expansion.

São Paulo, Brazil – (December 27, 2023) – Sigma Lithium Corporation (“Sigma Lithium” or the “Company”)

(NASDAQ: SGML, BVMF: S2GM34, TSXV: SGML) , a leading lithium producer dedicated to powering the next

generation of electric vehicles with carbon neutral, Quintuple Zero Green Lithium concentrate, is proud to cap off

an incredible year for the Company by loading one last shipment of 22,000 tonnes of concentrate to Glencore at

the Port of Vitoria. Sigma Lithium’s fifth shipment is expected to leave port by year-end.

Glencore will prepay 50% of the fifth shipment’s value upon completion of loading. The 50% prepayment reflects

a provisional premium price for the Company’s unique Quintuple Zero Green Lithium concentrate.

Sigma Lithium has completed an incredible journey over the past twelve months, having gone from commissioning

the crushing unit in December of 2022 on schedule and on budget, to sustaining nameplate production levels at

its Greentech lithium concentrate plant in December 2023. Operating rates at these levels would support a

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monthly shipment cadence of roughly 22,000 tonnes through the course of 2024 , annualizing approximately

270,000 tonnes of Quintuple Zero Green Lithium concentrate.

Sigma Lithium CEO, Ana Cabral-Gardner commented, “We have a relentless, resilient team who has been working

for years on a mission that has become our collective legacy: supporting the electric vehicle revolution by delivering

the most sustainable lithium material in the world. In the process we bec ame a better version of ourselves,

transforming the lives of the people around us by providing economic empowerment, inclusion, citizenship. We are

laying the foundation for common prosperity where metals, mining and metallurgical industries are fully embraced

by communities as the drivers of technological and environmental innovation as well as positive social change. Our

team has rarely set a foot wrong, nor missed our operational deadlines. We delivered on our promise s, including

those that seemed impossible at the time, such as achieving Carbon Neutrality / Net Zero 27 years ahead of the

metal and mining industry.”

Ligia Seca, Director of Institutional Relations : “We carry an enormous sense of mission and purpose on our

shoulders: There are over 13,000 people in our communities who are benefitting from Sigma Lithium’s investments

and growth. We continue to invest heavily in technology to be able to beneficiate our lithium concentrate in harmony

with nature : P roducing what has now become the most sustainable lithium in the world , honoring all the high

expectations placed upon us by our country and our people. As a result , we have opened a whole new set of

opportunities for Brazil to become a key participant in the most coveted global sustainable supply chains for battery

materials.”

Matthew DeYoe, EVP of Corporate Affairs & Strategic Development: “Sustaining production at nameplate capacity

was the final step in gaining confidence that Sigma’s operations have completed the ramp process. Our team

overcame incredible challenges to deliver something that has never been done before, a dry -stack tailing process

with zero net carbon and 100% water reuse in the production circuit. I am incredibly proud of the work the site-team

has done over the past year and I look forward to keeping the momentum going into 2024.”

Picture 1: Sigma Delivered on Every Operational Milestone in 2023: Consistency & Focus

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Picture 2-3: Sigma concentrate loading at Vitoria

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ABOUT SIGMA LITHIUM

Sigma Lithium (NASDAQ: SGML, BVMF: S2GM34, TSXV: SGML) 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.

Sigma Lithium has been at the forefront of environmental and social sustainability in the EV battery materials

supply chain for six years and it is currently producing Quintuple Zero Green Lithium from its Grota do Cirilo

Project in Brazil. Phase 1 of the project is expected to produce 270,000 tonnes of Quintuple Zero Green Lithium

annually (36,700 LCE annually). If it determines to proceed after completion of the detailed engineering study,

Phase 2 & 3 of the project are expected to increase production to 766,000 tonnes annually (or 104,200 LCE

annually). The project produces Quintuple Zero Green Lithium in its state-of-the-art Greentech lithium plant that

uses 100% renewable energy, 100% recycled water and 100% dry-stacked tailings.

Please refer to the Company’s National Instrument 43-101 technical report titled "Grota do Cirilo Lithium Project

Araçuaí and Itinga Regions, Minas Gerais, Brazil, Amended and Restated Technical Report" issued June 12, 2023,

which was prepared for Sigma Lithium by Homero Delboni Jr., MAusIMM, Promon Engenharia; Marc -Antoine

Laporte, P.Geo, SGS Canada Inc; Jarrett Quinn, P.Eng., Primero Group Americas; Porfirio Cabaleiro Rodriguez,

(MEng), FAIG, GE21 Consultoria Mineral; and Noel O'Brien, B.E., MBA, F AusIMM (the “Updated Technical

Report”). The Updated Technical Report is filed on SEDAR and is also available on the Company’s website.

For more information about Sigma Lithium, visit https://www.sigmalithiumresources.com/

FOR ADDITIONAL INFORMATION PLEASE CONTACT

Mathew DeYoe, EVP, Corporate Affairs & Strategic Development

+1 (201) 819-0303

[email protected]

Jamie Flegg, Director, Business Development

+1 (647) 706-1087

[email protected]

Daniel Abdo, Director, Investor Relations

+55 11 2985-0089

[email protected]

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 Tai lings

strategy, achievement of ramp-up volumes, production estimates and the operational status of the Groto 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

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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 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 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 inhere ntly 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 s uch

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.sedar.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.