Special Meeting of Stockholders to be held on Wednesday, April 21, 2021

GigCapital3, Inc. (“GigCapital3”) (NYSE: GIK), a Technology, Media and Telecom (TMT) Private-to-Public Equity (PPE)™ corporation, encourages its stockholders to vote in favor of the previously announced proposed business combination with Lightning eMotors (“Lightning eMotors”).

This special meeting of stockholders to vote upon the business combination will be held virtually on Wednesday, April 21, 2021 at 10:00 a.m. Pacific Time (1:00 p.m. Eastern Time) via a virtual meeting at the following address: www.virtualshareholdermeeting.com/GIK2021SM.

GigCapital3’s stockholders of record at the close of business on the Record Date, March 15, 2021, are entitled to vote the shares of common stock of GigCapital3 owned by them at the Special Meeting.

Every stockholder's vote is important, regardless of the number of shares held, and GigCapital3 requests the prompt submission of votes. GigCapital3 has made arrangements for stockholders to vote online, by telephone, or by mail, simply by following the instructions on their provided proxy card. Additionally, to simplify the process, every shareholder can indicate their vote by marking the proxy card and send it directly on an email to Dan Sullivan at MacKenzie Partners, Inc., dsullivan@mackenziepartners.com.

GigCapital3 stockholders entitled to vote at the Special Meeting will need the 16-digit meeting control number that is printed on their respective proxy cards to enter the Special Meeting. GigCapital3 recommends that its stockholders wishing to vote at the Special Meeting log in at least 15 minutes before the Special Meeting starts. Please note that GigCapital3 stockholders will not be able to attend the Special Meeting in person. GigCapital3 encourages its stockholders entitled to vote at the Special Meeting to vote their shares via proxy in advance of the Special Meeting by following the instructions on the proxy card.

A list of GigCapital3 stockholders entitled to vote at the Special Meeting will be open to the examination of any GigCapital3 stockholder, for any purpose germane to the Special Meeting, during regular business hours for a period of ten calendar days before the Special Meeting.

If stockholders have any questions or need assistance in identifying the 16-digit meeting control number or any other matter please call GigCapital3’s proxy solicitor, MacKenzie Partners, Inc., at (800) 322-2885 or email Dan Sullivan at dsullivan@mackenziepartners.com.

About Lightning eMotors

Lightning eMotors has been providing specialized and sustainable fleet solutions since 2009, deploying complete zero-emission-vehicle (ZEV) solutions for commercial fleets since 2018 – including Class 3 cargo and passenger vans, Class 4 and 5 cargo vans and shuttle buses, Class 6 work trucks, school buses, Class 7 city buses, and Class A motor coaches. The Lightning eMotors team designs, engineers, customizes and manufactures zero-emission vehicles to support the wide array of fleet customer needs including school buses and ambulances, with a full suite of telematics, analytics and charging solutions to simplify the buying and ownership experience and maximize uptime and energy efficiency. To learn more, visit https://lightningemotors.com.

About GigCapital Global and GigCapital3, Inc.

GigCapital Global (“GigCapital”) is a Private-to-Public Equity (PPE) technology, media, and telecommunications (TMT) focused investment group led by an affiliated team of technology industry corporate executives and entrepreneurs, and TMT operational and strategic experts in the private and public markets, including substantial, success-proven M&A and IPO activities. The group deploys a unique Mentor-Investors™ methodology to partner with exceptional TMT companies, managed by dedicated and experienced entrepreneurs. GigCapital was launched in 2017 with the vision of becoming the lead franchise in incepting and developing TMT Private-to-Public Equity (PPE) companies. For more information, visit www.gigcapitalglobal.com or https://www.GigCapital3.com/.

GigCapital3, Inc. is one of GigCapital’s Private-to-Public Equity (PPE) companies.

“Private-to-Public Equity (PPE)” and “Mentor-Investor” are trademarks of GigFounders, LLC, used pursuant to agreement.

Additional Information and Where to Find It

In connection with the proposed business combination, GigCapital3 filed the Registration Statement with the SEC, which includes the definitive proxy statement to be distributed to holders of GigCapital3’s common stock in connection with GigCapital3’s solicitation of proxies for the vote by GigCapital3’s stockholders with respect to the business combination and other matters as described in the Registration Statement and a prospectus relating to the offer of the securities to be issued to the equity holders of Lightning eMotors in connection with the business combination. The Registration Statement was declared effective by the SEC on March 26, 2021 and the definitive proxy statement/prospectus and other relevant documents will be mailed to GigCapital3’s stockholders as of the Record Date. GigCapital3’s stockholders and other interested persons are advised to read the definitive proxy statement / prospectus, in connection with GigCapital3’s solicitation of proxies for the Special Meeting to be held to approve, among other things, the business combination, because these documents contain important information about GigCapital3, Lightning eMotors and the business combination. Stockholders may also obtain a copy of the definitive proxy statement/prospectus, as well as other documents filed with the SEC regarding the business combination and other documents filed with the SEC by GigCapital3, without charge, at the SEC’s website located at www.sec.gov or by directing a request to Brad Weightman, Vice President and Chief Financial Officer, GigCapital3, Inc., 1731 Embarcadero Rd., Suite 200, Palo Alto, CA 94303, or by telephone at (650) 276-7040.

Participants in the Solicitation

Lightning eMotors, GigCapital3 and certain of their respective directors, executive officers and other members of management and employees may, under SEC rules, be deemed to be participants in the solicitation of proxies from GigCapital3’s stockholders in connection with the business combination. Information regarding the persons who may, under SEC rules, be deemed participants in the solicitation of GigCapital3’s stockholders in connection with the business combination, including a description of their direct and indirect interests, is set forth in the Registration Statement filed with the SEC. You can find more information about GigCapital3’s directors and executive officers in the Registration Statement. You may obtain free copies of these documents from the sources indicated above.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Such forward-looking statements include, but are not limited to, statements regarding the business combination between GigCapital3 and Lightning eMotors and its closing, and the expectations, hopes, beliefs, intentions, plans, prospects or strategies regarding the business combination, the future business plans of the Lightning eMotors and GigCapital3 management teams, and Lightning eMotors’ revenue growth and financial performance, facilities, product expansion, services and product shipments and capabilities. Any statements contained herein that are not statements of historical fact may be deemed to be forward-looking statements. In addition, any statements that refer to projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions, are forward-looking statements. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. The forward-looking statements contained in this press release are based on certain assumptions and analyses made by the management of GigCapital3 and/or Lightning eMotors in light of their respective experience and their perception of historical trends, current conditions and expected future developments and their potential effects on Lightning eMotors and GigCapital3 as well as other factors they believe are appropriate in the circumstances. There can be no assurance that future developments affecting Lightning eMotors or GigCapital3 will be those that the parties have anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond the control of the parties) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements, including that the GigCapital3 stockholders will approve the business combination with Lightning eMotors, the ability of the post-combination company to meet the NYSE listing standards, product and service acceptance and that Lightning eMotors will have sufficient capital upon the approval of the transaction to operate as anticipated. Should one or more of these risks or uncertainties materialize, or should any of our assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements. Additional factors that could cause actual results to differ are discussed under the heading “Risk Factors” and in other sections of GigCapital3’s filings with the SEC, and in GigCapital3’s current and periodic reports filed or furnished from time to time with the SEC. All forward-looking statements in this press release are made as of the date hereof, based on information available to GigCapital3 and/or Lightning eMotors as of the date hereof, and GigCapital3 and Lightning eMotors assume no obligation to update or revise any forward-looking statement, whether as a result of new information, future events or otherwise, except as may be required under applicable securities laws.

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