Item 8.01 Other Events.



As previously disclosed by GigCapital3, Inc. (the "Company" or "GigCapital3")
under Item 1.01 of its Current Report on Form 8-K filed on December 11, 2020,
the Company, Project Power Merger Sub, Inc., a Delaware corporation and a
wholly-owned subsidiary of GigCapital3 ("Merger Sub"), and Lightning Systems,
Inc., a Delaware corporation ("Lightning Systems"), entered into a Business
Combination Agreement, pursuant to which Merger Sub will be merged with and into
Lightning Systems (the "Business Combination"), with Lightning Systems surviving
the Business Combination as a wholly owned subsidiary of GigCapital3.

On each of January 7, 2021, January 12, 2021, January 18, 2021, January 22,
2021, January 25, 2021 and February 8, 2021, the Company received letters (the
"Stockholder Letters") from purported stockholders of GigCapital3 claiming
certain allegedly material omissions in the registration statement on Form S-4
(No. 33-251862), originally filed on December 31, 2020, and subsequently amended
on February 4, 2021, March 1, 2021 and March 22, 2021 (as amended, the "Proxy
Statement"). The registration statement was declared effective by the Securities
and Exchange Commission (the "SEC") on March 26, 2021, and GigCapital3 also
commenced mailing the Proxy Statement on March 26, 2021.

While the Company believes that the disclosures set forth in the Proxy Statement
comply fully with applicable law, in order to resolve the plaintiffs' disclosure
claims in the Stockholder Letters so as to avoid nuisance, cost and distraction,
and to preclude any efforts to delay the closing of the Business Combination,
the Company has determined to voluntarily supplement the Proxy Statement with
the supplemental disclosures set forth below (the "Supplemental Disclosures").
Nothing in the Supplemental Disclosures shall be deemed an admission of the
legal necessity or materiality under applicable laws of any of the disclosures
set forth herein. To the contrary, the Company specifically denies all
allegations in the Stockholder Letters that any additional disclosure was or is
required. The Company believes the Stockholder Letters are without merit.

The Supplemental Disclosures will not affect the timing of GigCapital3's special
meeting of stockholders scheduled to be held online via live webcast on
April 21, 2021 at 10:00 a.m., PDT,
at www.virtualshareholdermeeting.com/GIK2021SM (the "Special Meeting"). The
board of directors of the Company continues to recommend that you vote "FOR"
each of the proposals being considered at the Special Meeting.

Supplemental Disclosures to Proxy Statement

The following information should be read in conjunction with the Proxy Statement. All page references in the information below are to pages in the Proxy Statement, and capitalized terms used in this Current Report on Form 8-K shall have the meanings set forth in the Proxy Statement, unless otherwise defined herein.

The following disclosure is added on page 157 of the Proxy Statement/Prospectus at the end of the section entitled "Background of the Business Combination".



As disclosed in the proxy statement/prospectus and the audited financial
statements included and incorporated therein, Oppenheimer & Co. Inc.
("Oppenheimer") and Nomura Securities International, Inc. ("Nomura") served as
two of the three underwriters in its IPO, and in conjunction with the IPO,
GigCapital3 upon successful completion of a business combination agreed to pay
Oppenheimer and Nomura their portion of deferred underwriting commissions of
$0.40 per Unit, which for the 20 million Units sold in the IPO, equals
$8.0 million in the aggregate, of which Oppenheimer will receive 34%, or
$2.72 million, and Nomura will receive 51%, or $4.08 million. As also disclosed
in the proxy statement/prospectus, the Company engaged Oppenheimer and Nomura to
act as (1) joint placement agents (together with BofA Securities, Inc.) in
connection with the PIPE financing and convertible note financing, and
(2) exclusive joint financial advisors to the Company in connection with the
proposed Business Combination, and the fees for the services to be paid for
these services, plus the above-noted deferred underwriting commissions, are
included in the estimated transaction and other costs disclosed in the Pro Forma
Condensed Combined Balance Sheet as of December 31, 2020 included as part of the
proxy statement/prospectus. All of the activities of Oppenheimer and Nomura with
regard to their respective roles as joint financial advisors and joint placement
agents (together with BofA Securities, Inc.) to the Company are described in
this section. Neither Oppenheimer nor Nomura prepared any financial analyses for
the Company's Board.

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The following disclosure is added on page 148 of the Proxy Statement/Prospectus
following the penultimate sentence in the paragraph that starts with, "After our
IPO…" in the section entitled "Background of the Business Combination".

Such non-disclosure agreements contained customary terms for a special purpose
acquisition company and a private company target, including confidentiality
provisions and use restrictions for information provided by the target and
exceptions to such provisions. Further, such non-disclosure agreements did not
contain any standstill or "don't ask, don't waive" provisions.

The following disclosure is added on page 155 of the Proxy Statement/Prospectus prior to the end of the first sentence in the paragraph that starts with, "During the period between November 13, 2020…" in the section entitled "Background of the Business Combination".

as a result of Lightning Systems determining that it was projecting fewer delivery of vehicles during the then-current quarter than previously projected which would result in less revenue.



The following disclosure is added on page 155 of the Proxy Statement/Prospectus
following the first sentence in the paragraph that starts with, "During the
period between November 13, 2020…" in the section entitled "Background of the
Business Combination".

The reduced total enterprise value of Lightning Systems of $631 million with no
earnout structure involving shares of the Company's Sponsor that was
communicated by Dr. Dinu on November 17, 2020, was in part a response to the
need by Lightning Systems to undertake a downward reduction of projected
revenues, gross profit and EBITDA as a result of the projection that it would be
delivering fewer vehicles during the then-current quarter.

The following disclosure is added in lieu of the "Lightning Systems Key Financials" table on page 164 of the Proxy Statement/Prospectus under the heading "Unaudited Prospective Financial Information".

Lightning Systems Key Financials

($ in million, unless otherwise noted) 2020 2021 2022

        2023         2024         2025
Revenue                                    $     9       $   63       $  354      $  640      $  1,165      $ 2,012
Gross Growth                                    NM           NM          462 %        81 %          82 %         73 %
Gross Profit                               $     0       $    9       $   68      $  140      $    296      $   528
Gross Margin                                     3 %         14 %         19 %        22 %          25 %         26 %
Adjusted EBITDA                            ($   11 )     ($  17 )     $   15      $   50      $    155      $   315
Adjusted EBITDA Margin                        (122 %)       (27 %)         4 %         8 %          13 %         16 %
Free Cash Flow                             ($   16 )     ($  43 )     ($  71 )    ($  55 )    ($    18 )    $    50

Source: Lightning Systems' Management Projections

The following disclosure is added after the section entitled "Management and Board of Directors" commencing on page 276 of the Proxy Statement/Prospectus.

At the completion of the Business Combination, none of the officers of GigCapital3 will continue as officers of New Lightning Systems.

Additional Information About the Proposed Business Combination and Where to Find It



The business combination will be submitted to stockholders of GigCapital3 for
their consideration. GigCapital3 has filed a registration statement on Form S-4
(File No. 333-251862) with the SEC containing a preliminary proxy statement and
a preliminary prospectus of GigCapital3. After the registration statement was
declared effective, GigCapital3 mailed a definitive proxy statement/prospectus
relating to the proposed business

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combination to its stockholders. This Current Report on Form 8-K does not
contain all the information that should be considered concerning the proposed
business combination and is not intended to form the basis of any investment
decision or any other decision in respect of the business combination.
GigCapital3's stockholders and other interested persons are advised to read the
definitive proxy statement/prospectus, as well as other documents filed with the
SEC, because these documents will contain important information about the
business combination. The definitive proxy statement/consent solicitation
statement/prospectus and other relevant materials for the proposed business
combination were mailed to stockholders of GigCapital3 as of March 15, 2021, the
record date for voting on the proposed business combination.

Stockholders may also obtain a copy of the preliminary proxy statement/prospectus as well as 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 their respective directors and executive
officers and other persons may be deemed to be participants in the solicitations
of proxies from GigCapital3's stockholders in respect of the proposed business
combination and related transactions. Information regarding GigCapital3's
directors and executive officers is available in its final prospectus filed with
the SEC under Rule 424(b)(4) on May 15, 2020. Additional information regarding
the participants in the proxy solicitation and a description of their direct and
indirect interests will be contained in the preliminary and definitive proxy
statements/prospectus related to the proposed business combination and related
transactions when it becomes available, and which can be obtained free of charge
from the sources indicated above.

Forward-Looking Statements



This Current Report on Form 8-K 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 Current Report on Form 8-K 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 transaction, 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 Current Report on Form 8-K 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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