Sigma Lithium — AGM Information 2020

Dec 2, 2020

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SIGMA LITHIUM RESOURCES CORPORATION NOTICE OF ANNUAL MEETING OF SHAREHOLDERS

NOTICE IS HEREBY GIVEN THAT the annual meeting (the “ Meeting ”) of the shareholders of Sigma Lithium Resources Corporation (the “ Corporation ”) will be held on Tuesday December 29, 2020 at 10:00 a.m. (Toronto time), by virtual only meeting via live audio webcast online. Shareholders and duly appointed proxyholders can attend the meeting online at https://web.lumiagm.com/252981855, where they can participate, vote, or submit questions during the meeting’s live webcast, for the following purposes:

• (a) to receive the financial statements of the Corporation for the fiscal year ended December 31, 2019 together with the report of the auditors thereon;

• (b) to fix the number of directors to be elected at six;

• (c) to elect directors for the ensuing year;

• (d) to appoint the auditors of the Corporation to hold office until the next annual meeting of the Shareholders and authorize the directors to fix their remuneration; and

• (e) transact such other business as may properly come before the Meeting or any adjournments thereof.

Shareholders who wish to appoint a third party proxyholder to represent them at the online meeting must submit their form of proxy or voting instruction form (if applicable) prior to registering your proxyholder. Registering your proxyholder is an additional step once you have submitted your form of proxy or voting instruction form. Failure to register the proxyholder will result in the proxyholder not receiving a Username to participate in the Meeting. To register a proxyholder, shareholders MUST visit http://www.computershare.com/SigmaLithium by December 23, 2020 and provide Computershare Investor Services Inc. (“ Computershare ”) with their proxyholder’s contact information, so that Computershare may provide the proxyholder with a Username via email.

A proxy can be submitted to Computershare either in person, or by mail or courier, to 100 University Avenue, 8[th] Floor, Toronto, Ontario, M5J 2Y1, or via the internet at www.investorvote.com. The proxy must be deposited with Computershare by no later than 09:00 a.m. (Toronto time) on December 23, 2020, or if the Meeting is adjourned or postponed, not less than 48 hours, excluding Saturdays, Sundays and statutory holidays, before the commencement of such adjourned or postponed Meeting. If a shareholder who has submitted a proxy attends the Meeting via the webcast and has accepted the terms and conditions when entering the Meeting online, any votes cast by such shareholder on a ballot will be counted and the submitted proxy will be disregarded.

The Meeting will be hosted online by way of a live webcast at https://web.lumiagm.com/252981855. Registered Shareholders and duly appointed proxyholders can participate in the meeting by clicking “I have a login” and entering a Username and Password before the start of the Meeting.

• Registered Shareholders : The 15-digit control number located on the form of proxy or in the email notification you received is the Username and the Password is “******”.

• Duly appointed proxyholders : Computershare will provide the proxyholder with a Username after the voting deadline has passed. The Password to the meeting is “******”.

Voting at the Meeting will only be available for Registered Shareholders and duly appointed proxyholders. NonRegistered Shareholders who appoint themselves as a proxyholder MUST register with Computershare at

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http://www.computershare.com/SigmaLithium after submitting their voting instruction form in order to receive a

Username. Non-Registered Shareholders who have not appointed themselves may attend the meeting by clicking “I am a guest” and completing the online form.

It is important that you are connected to the internet at all times during the meeting in order to vote when balloting commences.

In order to participate online, shareholders must have a valid 15-digit control number and proxyholders must have received an email from Computershare containing a Username.

WITHOUT A USERNAME, PROXYHOLDERS WILL NOT BE ABLE TO VOTE AT THE MEETING.

Only shareholders of record at the close of business on November 17, 2020 (the “ Record Date ”) will be entitled to vote at the Meeting, and, except as otherwise determined from time to time by directors of the Corporation, no shareholders becoming such after the Record Date will be entitled to receive notice of and vote at the Meeting or any adjournment thereof or to be treated as a shareholder of record for purposes of such other action.

The accompanying management information circular (the “Circular”) provides additional information relating to the matters to be dealt with at the Meeting and forms part of this notice. The Circular also provides the required information as to how shareholders and proxyholders can register for, and access and participate at, the Meeting.

Electronic copies of this notice, the Circular and other Meeting materials may be found on the Corporation’s profile on System for Electronic Document Analysis and Retrieval (“ SEDAR ”) at www.sedar.com.

Shareholders are reminded to review the Circular before voting.

DATED at Vancouver, British Columbia this2nd day of December, 2020.

BY ORDER OF THE BOARD OF DIRECTORS of Sigma Lithium Resources Corporation

(signed) “Calvyn Gardner”

Calvyn Gardner Chief Executive Officer

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