Document:

EX-10.6

 Exhibit 10.6 

INVESTMENT MANAGEMENT TRUST AGREEMENT 

This Agreement is made as of May 18, 2020 by and between GigCapital3, Inc. (the “Company”), having its principal
office located at 1731 Embarcadero Rd., Suite 200, Palo Alto, CA 94303 and Continental Stock Transfer & Trust Company (the “Trustee”) located at 1 State Street, 30th Floor, New York, New York 10004. 

WHEREAS, the Company’s Registration Statement on Form S-1, as amended, No. 333-236626 (together with any related registration statement filed pursuant to Rule 462(b), the “Registration Statement”), for the initial public offering of the
Company’s units (the “Public Units”), each of which consists of one share of the Company’s common stock, par value $0.0001 per share (the “Common Stock”; and
the Common Stock included in the Public Units, the “Public Common Stock”), and three-fourths of one warrant, each whole warrant (a “Warrant”) entitling the holder thereof to purchase one share of
Common Stock (such initial public offering hereinafter referred to as the “IPO”), has been declared effective as of May 5, 2020 by the U.S. Securities and Exchange Commission, and Post-Effective Amendment No. 1 to
the Registration Statement has been declared effective as of May 13, 2020; 
 WHEREAS, the Company has entered into an Underwriting
Agreement, dated as of May 13, 2020, with Nomura Securities International, Inc. and Oppenheimer & Co. Inc., as representatives (the “Representatives”) of the underwriters (the
“Underwriters”) named therein (the “Underwriting Agreement”), with respect to the IPO; 

WHEREAS, GigAcquisitions3, LLC, a Delaware limited liability company (the “Sponsor”), and the Underwriters have
committed, pursuant to written agreements, to purchase an aggregate of 893,479 of the Company’s units (the “Private Units”), each of which consists of one share of Common Stock and three-fourths of one Warrant, in a
private placement that will close simultaneously with the IPO; 
 WHEREAS, as described in the Registration Statement, $202,000,000 of the
gross proceeds of the IPO and the sale of the Private Units ($232,300,000 if the Underwriters’ over-allotment option is exercised in full) will be delivered to the Trustee to be deposited and held in a segregated trust account located in the
United States (the “Trust Account”) for the benefit of the Company, the holders of the Public Common Stock and the Underwriters (the amount to be delivered to the Trustee, and any interest subsequently earned thereon, will be
referred to herein as the “Property”; the stockholders for whose benefit the Trustee shall hold the Property will be referred to as the “Public Stockholders”, and the Public Stockholders, the Company
and the Underwriters will be referred to together as the “Beneficiaries”); and 
 WHEREAS, the Company and the
Trustee desire to enter into this Agreement to set forth the terms and conditions pursuant to which the Trustee shall hold the Property. 

IT IS AGREED: 
 1. Agreements and Covenants of
Trustee. The Trustee hereby agrees and covenants to: 
 (a) Hold the Property in trust for the Beneficiaries in accordance with the terms
of this Agreement in the Trust Account, which Trust Account shall be established by the Trustee at a branch of J.P. Morgan Chase Bank, N.A. and at a brokerage institution selected by the Trustee that is satisfactory to the Company; 

(b) Manage, supervise and administer the Trust Account subject to the terms and conditions set forth herein; 

(c) In a timely manner, upon the instruction of the Company, to invest and reinvest the Property in United States “government
securities” within the meaning of Section 2(a)(16) of the Investment Company Act of 1940, as amended (the “Investment Company Act”), having a maturity of 185 days or less, and/or in any open ended investment company
registered under the Investment Company Act that holds itself out as a money market fund selected by the Company meeting the conditions of paragraphs (d)(2), (d)(3) and (d)(4) of
Rule 2a-7 promulgated under the Investment Company Act or any successor rule, which invests only in direct U.S. government treasury obligations, as determined by the Company. As used herein,
“government securities” shall mean United States Treasury Bills; the Trustee may not invest in any other securities or assets, it being understood that the Trust Account will earn no interest while account funds are uninvested awaiting the
Company’s instructions hereunder and the Trustee may earn bank credits or other consideration during such periods; 

  
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 (d) Collect and receive, when due, all principal and interest income arising from the
Property, all of which income shall become part of the Property and which interest income can then be released to the Company to the extent required to pay taxes when requested by the Company as provided for in Section 1(l) below; 

(e) Notify the Company and the Representatives of all communications received by it with respect to any Property requiring action by the
Company; 
 (f) Supply any necessary information or documents as may be requested by the Company or its authorized agents in connection with
the Company’s preparation of the tax returns relating to assets held in the Trust Account; 
 (g) Participate in any plan or proceeding
for protecting or enforcing any right or interest arising from the Property if, as and when instructed by the Company in writing to do so; 

(h) Render to the Company, and to such other person as the Company may instruct, monthly written statements of the activities of and amounts in
the Trust Account reflecting all receipts and disbursements of the Trust Account; 
 (i) Commence liquidation of the Trust Account only after
and promptly after (x) receipt of, and only in accordance with, the terms of a letter from the Company (“Termination Letter”) in a form substantially similar to that attached hereto as either Exhibit
A or Exhibit B signed on behalf of the Company by the Chief Executive Officer or Chief Financial Officer of the Company or by the Executive Chairman of the Board of Directors of the Company (the
“Board”) or other authorized officer of the Company, and complete the liquidation of the Trust Account and distribute the Property in the Trust Account, including interest (less up to $100,000 of interest that may be released
to the Company to pay dissolution expenses in the case of a Termination Letter in the form of Exhibit B hereto and which interest shall be net of any taxes payable), only as directed in the Termination Letter and the other
documents referred to therein, or (y) the date which is the later of (i) 18 months after the closing of the IPO and (ii) such later date as may be approved by the Company’s stockholders in accordance with the Company’s
Amended and Restated Certificate of Incorporation, as filed with the Secretary of State of the State of Delaware (the “Amended and Restated Certificate”) if a Termination Letter has not
been received by the Trustee prior to such date, in which case the Trust Account shall be liquidated in accordance with the procedures set forth in the form of letter attached hereto as Exhibit B and the Property in the Trust
Account, including interest (less up to $100,000 of interest that may be released to the Company to pay dissolution expenses in the case of a Termination Letter in the form of Exhibit B hereto and which interest shall be net of any
taxes payable), shall be distributed to the Public Stockholders of record as of such date; provided, however, that in the event the Trustee receives a Termination Letter in a form substantially similar
to Exhibit B hereto, or if the Trustee begins to liquidate the Property because it has received no such Termination Letter by the date specified in clause (y) of this Section 1(i), the Trustee shall keep the
Trust Account open until twelve (12) months following the date the Property has been distributed to the Public Stockholders; 
 (j) Upon
written request from the Company, which may be given from time to time in a form substantially similar to that attached hereto as Exhibit C (a “Tax Payment Withdrawal Instruction”), withdraw from the Trust
Account and distribute to the Company the amount of interest earned on the Property requested by the Company to cover any tax obligation owed by the Company as a result of assets of the Company or interest or other income earned on the Property,
which amount shall be delivered directly to the Company by electronic funds transfer or other method of prompt payment, and the Company shall forward such payment to the relevant taxing
authority; provided, however, that to the extent there is not sufficient cash in the Trust Account to pay such tax obligation, the Trustee shall liquidate such assets held in the Trust Account as shall be
designated by the Company in writing to make such distribution so long as such distribution shall not result in a reduction in the principal amount initially deposited in the Trust Account; provided, further,
that if the tax to be paid is a franchise tax, the written request by the Company to make such distribution shall be accompanied by a copy of the franchise tax bill from the State of Delaware for the Company and a written statement from the
principal financial officer of the Company setting forth the actual amount payable (it being acknowledged and agreed that any such amount in excess of interest income earned on the Property shall not be payable from the Trust Account). The written
request of the Company referenced above shall constitute presumptive evidence that the Company is entitled to said funds, and the Trustee shall have no responsibility to look beyond said request; 

  
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 (k) Upon written request from the Company, which may be given from time to time in a form
substantially similar to that attached hereto as Exhibit D (a “Stockholder Redemption Withdrawal Instruction”), the Trustee shall distribute to the Public Stockholders of record as of the applicable date the
amount requested by the Company to be used to redeem shares of Public Common Stock from Public Stockholders properly submitted in connection with a stockholder vote to approve an amendment to any provision of the Amended and Restated Certificate
relating to pre-initial Business Combination (as defined below) activity or the related stockholders’ rights. The written request of the Company referenced above shall constitute presumptive
evidence that the Company is entitled to said funds, and the Trustee shall have no responsibility to look beyond said request; and 

(l) Not make any withdrawals or distributions from the Trust Account other than pursuant to Sections
1(i), 1(j) or 1(k) above. 
 2. Agreements and Covenants of the Company. The Company hereby agrees and covenants
to: 
 (a) Give all instructions to the Trustee hereunder in writing, signed by the Company’s President, the Executive Chairman of the
Board or the Company’s Chief Executive Officer or Chief Financial Officer. In addition, except with respect to its duties under Sections 1(i), 1(j) and 1(k) above, the Trustee shall be entitled to
rely on, and shall be protected in relying on, any verbal or telephonic advice or instruction which it, in good faith and with reasonable care, believes to be given by any one of the persons authorized above to give written instructions, provided
that the Company shall promptly confirm such instructions in writing; 
 (b) Subject to Section 4 hereof, hold the
Trustee harmless and indemnify the Trustee from and against any and all expenses, including reasonable counsel fees and disbursements, or losses suffered by the Trustee in connection with any action taken by it hereunder and in connection with any
action, suit or other proceeding brought against the Trustee involving any claim, or in connection with any claim or demand, which in any way arises out of or relates to this Agreement, the services of the Trustee hereunder, or the Property or any
interest earned on the Property, except for expenses and losses resulting from the Trustee’s gross negligence, fraud or willful misconduct. Promptly after the receipt by the Trustee of notice of demand or claim or the commencement of any
action, suit or proceeding, pursuant to which the Trustee intends to seek indemnification under this Section 2(b), it shall notify the Company in writing of such claim (hereinafter referred to as the “Indemnified
Claim”). The Trustee shall have the right to conduct and manage the defense against such Indemnified Claim; provided, that the Trustee shall obtain the consent of the Company with respect to the selection of
counsel, which consent shall not be unreasonably withheld or delayed. The Trustee may not agree to settle any Indemnified Claim without the prior written consent of the Company, which such consent shall not be unreasonably withheld or delayed. The
Company may participate in such action with its own counsel; 
 (c) Pay the Trustee the fees set forth on Schedule A hereto,
including an initial acceptance fee, annual administration fee, and transaction processing fee which fees shall be subject to modification by the parties from time to time. It is expressly understood that the Property shall not be used to pay such
fees unless and until it is distributed pursuant to Sections 1(i) through 1(k) hereof. The Company shall pay the Trustee the initial acceptance fee and the first annual administration fee at the
consummation of the IPO, and, thereafter pay the annual fee. The Trustee shall refund to the Company the annual fee (on a pro rata basis) with respect to any period after the liquidation of the Trust Account. The Company shall not be responsible for
any other fees or charges of the Trustee except as set forth in this Section 2(c), Schedule A and as may be provided in Section 2(b) hereof; 

(d) In connection with any vote of the Company’s stockholders regarding a merger, capital stock exchange, asset acquisition, stock
purchase, reorganization or similar business combination involving the Company and one or more businesses (the “Business Combination”), provide to the Trustee an affidavit or certificate of the inspector of elections for the
stockholder meeting verifying the vote of such stockholders regarding such Business Combination; 
 (e) Provide the Representatives with a
copy of any Termination Letter(s) and/or any other correspondence that is sent to the Trustee with respect to any proposed withdrawal from the Trust Account promptly after it issues the same; and 

  
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 (f) In the event that the Company directs the Trustee to commence liquidation of the Trust
Account pursuant to Section 1(i), the Company agrees that it will not direct the Trustee to make any payments not specifically authorized by this Agreement. 

3. Limitations of Liability. The Trustee shall have no responsibility or liability to: 

(a) Imply obligations, perform duties, inquire or otherwise be subject to the provisions of any agreement or document other than this agreement
and that which is expressly set forth herein; 
 (b) Take any action with respect to the Property, other than as directed
in Section 1 hereof, and the Trustee shall have no liability to any party except for liability arising out of the Trustee’s gross negligence, fraud or willful misconduct; 

(c) Institute any proceeding for the collection of any principal and income arising from, or institute, appear in or defend any proceeding of
any kind with respect to, any of the Property unless and until it shall have received written instructions from the Company given as provided herein to do so and the Company shall have advanced or guaranteed to it funds sufficient to pay any
expenses incident thereto; 
 (d) Change the investment of any Property, other than in compliance with Section 1(c); 

(e) Refund any depreciation in principal of any Property; 

(f) Assume that the authority of any person designated by the Company to give instructions hereunder shall not be continuing unless provided
otherwise in such designation, or unless the Company shall have delivered a written revocation of such authority to the Trustee; 
 (g) The
other parties hereto or to anyone else for any action taken or omitted by it, or any action suffered by it to be taken or omitted, in good faith and in the exercise of its own best judgment, except for the Trustee’s gross negligence, fraud or
willful misconduct. The Trustee may rely conclusively and shall be protected in acting upon any order, judgment, instruction, notice, demand, certificate, opinion or advice of counsel (including counsel chosen by the Trustee, which counsel may be
the Company’s counsel), statement, instrument, report or other paper or document (not only as to its due execution and the validity and effectiveness of its provisions, but also as to the truth and acceptability of any information therein
contained) which the Trustee believes, in good faith, to be genuine and to be signed or presented by the proper person or persons. The Trustee shall not be bound by any notice or demand, or any waiver, modification, termination or rescission of this
Agreement or any of the terms hereof, unless evidenced by a written instrument delivered to the Trustee, signed by the proper party or parties and, if the duties or rights of the Trustee are affected, unless it shall give its prior written consent
thereto; 
 (h) Verify the accuracy of the information contained in the Registration Statement; 

(i) Provide any assurance that any Business Combination entered into by the Company or any other action taken by the Company is as contemplated
by the Registration Statement; 
 (j) File information returns with respect to the Trust Account with any local, state or federal taxing
authority or provide periodic written statements to the Company documenting the taxes payable by the Company, if any, relating to any interest income earned on the Property; 

(k) Prepare, execute and file tax reports, income or other tax returns and pay any taxes with respect to any income generated by, and
activities relating to, the Trust Account, regardless of whether such tax is payable by the Trust Account or the Company, including, but not limited to, income tax obligations, except pursuant to Section 1(j) hereof; or 

(l) Verify calculations, qualify or otherwise approve the Company’s written requests for distributions pursuant to Sections
1(i), 1(j) and 1(k) hereof. 

  
 4 

 4. Trust Account Waiver. The Trustee has no right
of set-off or any right, title, interest or claim of any kind (“Claim”) to, or to any monies in, the Trust Account, and hereby irrevocably waives any Claim to, or to any
monies in, the Trust Account that it may have now or in the future. In the event the Trustee has any Claim against the Company under this Agreement, including, without limitation,
under Section 2(b) or Section 2(c) hereof, the Trustee shall pursue such Claim solely against the Company and its assets outside the Trust Account and not against the Property or any monies in the Trust
Account. 
 5. Termination. This Agreement shall terminate as follows: 

(a) If the Trustee gives written notice to the Company that it desires to resign under this Agreement, the Company shall use its reasonable
efforts to locate a successor trustee, pending which the Trustee shall continue to act in accordance with this Agreement. At such time that the Company notifies the Trustee that a successor trustee has been appointed and has agreed to become subject
to the terms of this Agreement, the Trustee shall transfer the management of the Trust Account to the successor trustee, including but not limited to the transfer of copies of the reports and statements relating to the Trust Account, whereupon this
Agreement shall terminate; provided, however, that in the event that the Company does not locate a successor trustee within ninety (90) days of receipt of the resignation notice from the Trustee, the
Trustee may submit an application to have the Property deposited with any court in the State of New York or with the United States District Court for the Southern District of New York and upon such deposit, the Trustee shall be immune from any
liability whatsoever; 
 (b) At such time that the Trustee has completed the liquidation of the Trust Account and its obligations in
accordance with the provisions of Section 1(i) hereof (which section may not be amended except as described in Section 6(c)) and distributed the Property in accordance with the provisions of the Termination
Letter, this Agreement shall terminate except with respect to Section 2(b). 
 6. Miscellaneous. 

(a) The Company and the Trustee each acknowledge that the Trustee will follow the security procedures set forth below with respect to funds
transferred from the Trust Account. The Company and the Trustee will each restrict access to confidential information relating to such security procedures to authorized persons. Each party must notify the other party immediately if it has reason to
believe unauthorized persons may have obtained access to such information, or of any change in its authorized personnel. In executing funds transfers, the Trustee will rely upon all information supplied to it by the Company, including, account
names, account numbers, and all other identifying information relating to a beneficiary, beneficiary’s bank or intermediary bank. Except for any liability arising out of the Trustee’s gross negligence, fraud or willful misconduct, the
Trustee shall not be liable for any loss, liability or expense resulting from any error in the information or transmission of the funds. 

(b) This Agreement shall be governed by and construed and enforced in accordance with the laws of the State of New York, without giving effect
to conflict of laws. It may be executed in several counterparts, each one of which shall constitute an original, and together shall constitute but one instrument. 

(c) This Agreement contains the entire agreement and understanding of the parties hereto with respect to the subject matter hereof. Except
for Sections 1(i) and 1(k) hereof (each of which may not be modified, amended or deleted without the affirmative vote of sixty five percent (65%) of the then outstanding shares of Common Stock; provided,
that no such amendment will affect any Public Stockholder who has otherwise indicated his election to redeem his shares of Common Stock in connection with a stockholder vote sought to amend this Agreement), this Agreement or any provision hereof may
be changed, amended or modified by a writing signed by each of the parties hereto. 
 (d) The Trustee may rely conclusively on the
certification from the inspector of elections referenced above and shall be relieved of all liability to any party for executing the proposed amendment in reliance thereon. The parties hereto consent to the jurisdiction and venue of any state or
federal court located in the City of New York, State of New York, for purposes of resolving any disputes hereunder. AS TO ANY CLAIM, CROSS-CLAIM OR COUNTERCLAIM IN ANY WAY RELATING TO THIS AGREEMENT, EACH PARTY WAIVES THE RIGHT TO TRIAL BY JURY.

  
 5 

 (e) Any notice, consent or request to be given in connection with any of the terms or
provisions of this Agreement shall be in writing and shall be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery or by facsimile transmission: 

if to the Trustee, to: 

Continental Stock Transfer & Trust Company 

1 State Street, 30th Floor 

New York, New York 10004 

Attn: Francis Wolf and Celeste Gonzalez 

Email: fwolf@continentalstock.com 

Email: cgonzalez@continentalstock.com 

if to the Company, to: 

GigCapital3, Inc. 

1731 Embarcadero Rd., Suite 200 

Palo Alto, CA 94303 

Attn: Dr. Avi S. Katz 

Email: avi@gigcapitalglobal.com     

with a copy to: 

Crowell & Moring LLP 

3 Embarcadero Center, 26th Floor 

San Francisco, CA 94111 

Attn: Jeffrey Selman 

Fax: (415) 986-2827 

in either case, with a copy on behalf of the Representatives to: 

Nomura Securities International, Inc. 

Worldwide Plaza 

309 West 49th Street 

New York, NY 10019-7316 

Attn: Head of Equity Capital Markets and Solutions 

Fax: (646) 587-8740 

Oppenheimer & Co., Inc. 

85 Broad Street 

New York, NY 10019-7316 

Attn: General Counsel 

Fax: 
 with a copy
to: 
 Sidley Austin LLP 

787 7th Avenue 

New York, NY 10019 

Attn: Edward F. Petrosky, Esq. 

Fax: 
 (f) This
Agreement may not be assigned by the Trustee without the prior consent of the Company. This Agreement may be assigned by the Company to a wholly-owned subsidiary of the Company upon written notice to the Trustee. 

(g) Each of the Company and the Trustee hereby represents that it has the full right and power and has been duly authorized to enter into this
Agreement and to perform its respective obligations as contemplated hereunder. The Trustee acknowledges and agrees that it shall not make any claims or proceed against the Trust Account, including by way
of set-off, and shall not be entitled to any funds in the Trust Account under any circumstance. 

  
 6 

 (h) This Agreement is the joint product of the Trustee and the Company and each provision
hereof has been subject to the mutual consultation, negotiation and agreement of such parties and shall not be construed for or against any party hereto. 

(i) This Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original, but all such counterparts
shall together constitute one and the same instrument. Delivery of a signed counterpart of this Agreement by facsimile or electronic transmission shall constitute valid and sufficient delivery thereof. 

(j) Each of the Company and the Trustee hereby acknowledges and agrees that the Representatives, on behalf of the Underwriters, are third party
beneficiaries of this Agreement. 
 (k) Except as specified herein, no party to this Agreement may assign its rights or delegate its
obligations hereunder to any other person or entity. 
 (l) The Trustee hereby consents to the inclusion of Continental Stock
Transfer & Trust Company in the Registration Statement and other materials relating to the IPO. 
 [Signature page follows]

  
 7 

 IN WITNESS WHEREOF, the parties have duly executed this Investment Management Trust
Agreement as of the date first written above. 
  

			
	 CONTINENTAL STOCK TRANSFER

& TRUST COMPANY, as Trustee

		
	By:	 	 /s/ Francis Wolf

	Name:	 	Francis Wolf
	Title:	 	Vice President
	
	GIGCAPITAL3, INC.
		
	By:	 	 /s/ Avi S. Katz

	Name:	 	Avi S. Katz
	Title:	 	Chief Executive Officer

 Signature page to Investment Management Trust Agreement 

  
 8 

 SCHEDULE A 
  

							
	 Fee Item
	  	 Time and method of payment
	  	Amount	 
	Initial set-up fee.	  	Initial closing of IPO by wire transfer.	  	$	2,000	 
	Trustee administration fee	  	Payable annually. First year fee payable, at initial closing of IPO by wire transfer, thereafter by wire transfer or check.	  	$	10,000	 
	Transaction processing fee for disbursements to Company under Sections 1(i) and 1(j)	  	Deduction by Trustee from accumulated income following disbursement made to Company under Section 1	  	$	250	 
	Paying Agent services as required pursuant to Section 1(i) and 1(k)	  	Billed to Company upon delivery of service pursuant to Section 1(i) and 1(k)	  	 	Prevailing rates	 

  
 9 

 EXHIBIT A 

[Letterhead of Company] 

[Insert date] 
 Continental Stock
Transfer & Trust Company 
 1 State Street Plaza, 30th Floor 

New York, New York 10004 
 Attn: Francis Wolf and Celeste Gonzalez

  

			
	 Re:  Trust Account No. [•] Termination Letter

 Ladies and Gentlemen: 

Pursuant to Section 1(i) of the Investment Management Trust Agreement between GigCapital3, Inc., a Delaware corporation
(the “Company”), and Continental Stock Transfer & Trust Company (“Trustee”), dated as of [•], 2020 (“Trust Agreement”), this is to advise you that the Company has
entered into an agreement with                  (“Target Business”) to consummate a business combination with Target Business
(“Business Combination”) on or about [insert date]. The Company shall notify you at least seventy-two (72) hours in advance of the actual date fixed
for the consummation of the Business Combination (“Consummation Date”). Capitalized terms used but not defined herein shall have the meanings set forth in the Trust Agreement. 

In accordance with the terms of the Trust Agreement, we hereby authorize you to commence to liquidate all of the assets of the Trust Account
on [insert date], such that, on the Consummation Date, all of the funds held in the Trust Account will be immediately available for transfer to the account or accounts that the Company shall direct on the Consummation Date. It is
acknowledged and agreed that while the funds are on deposit in the Trust Account awaiting such transfer, the Company will not earn any interest or dividends. 

On the Consummation Date (i) counsel for the Company shall deliver to you written notification that the Business Combination has been
consummated, or will be consummated concurrently with your transfer of funds to the accounts directed by the Company (the “Notification”) and (ii) the Company shall deliver to you (a) a certificate (the “ (the
“Vote Verification Certificate”) of its Chief Executive Officer, which verifies either that (i) the Business Combination has been approved by a vote of the Company’s stockholders or (ii) no vote of the
Company’s stockholders for the approval of the Business Combination is required and none has been held, and (b) joint written instruction signed by the Company and the Representatives with respect to the transfer of the funds held in the
Trust Account, including payment of amounts owed to Public Stockholders who have properly exercised their redemption rights (the “Instruction Letter”). You are hereby directed and authorized to transfer the funds held in the
Trust Account immediately upon your receipt of the Notification, the Vote Verification Certificate and the Instruction Letter, in accordance with the terms of the Instruction Letter. In the event that certain deposits held in the Trust Account may
not be liquidated by the Consummation Date without penalty, you will notify the Company in writing of the same and the Company shall direct you as to whether such funds should remain in the Trust Account and be distributed after the Consummation
Date to the Company. Upon the distribution of all the funds, your obligations under the Trust Agreement shall be terminated. 
 In the event
that the Business Combination is not consummated on the Consummation Date described in the notice thereof and we have not notified you on or before the original Consummation Date of a new Consummation Date, then upon receipt by you of written
instructions from us, the funds held in the Trust Account shall be reinvested as provided in Section 1(c) of the Trust Agreement on the business day immediately following such original Consummation Date or as soon thereafter as
possible. 
  

			
	Very truly yours,
	
	GIGCAPITAL3, INC.
		
	By:	 	
                     

	Name:
	Title:

  
 A-1 

			
	AGREED TO AND ACKNOWLEDGED BY:
	
	NOMURA SECURITIES INTERNATIONAL, INC.
		
	By:	 	              

	Name:
	Title:
	
	OPPENHEIMER & CO. INC.
		
	By:	 	              

	Name:
	Title:

  
 A-2 

 EXHIBIT B 

[Letterhead of Company] 

[Insert date] 
 Continental Stock
Transfer & Trust Company 
 1 State Street Plaza, 30th Floor 

New York, New York 10004 
 Attn: Francis Wolf and Celeste Gonzalez

  

	 	Re:	 Trust Account No. [•] Termination Letter 

Ladies and Gentlemen: 
 Pursuant
to Section 1(i) of the Investment Management Trust Agreement between GigCapital3, Inc., a Delaware corporation (the “Company”) and Continental Stock Transfer & Trust Company
(“Trustee”), dated as of [•], 2020 (“Trust Agreement”), this is to advise you that the Company has been unable to effect a Business Combination within the time frame specified in the
Company’s Amended and Restated Certificate of Incorporation, as described in the Company’s prospectus relating to the IPO. Capitalized terms used but not defined herein shall have the meanings set forth in the Trust Agreement. 

In accordance with the terms of the Trust Agreement, we hereby authorize you to liquidate all of the assets in the Trust Account on [•],
20[    ] and to keep the total proceeds thereof in the Trust Account to await distribution to the Public Stockholders. The Company has selected [•], 20[    ], as the effective date for the purpose of
determining when the Public Stockholders will be entitled to receive their share of the liquidation proceeds. You agree to be the Paying Agent of record and, in your separate capacity as Paying Agent, agree to distribute said funds directly to the
Public Stockholders in accordance with the terms of the Trust Agreement and the Amended and Restated Certificate of Incorporation of the Company. Upon the distribution of all the funds, your obligations under the Trust Agreement shall be terminated.

  

			
	Very truly yours,
	
	GIGCAPITAL3, INC.
		
	By:	 	
                     

	Name:
	Title:

  

	cc:	 Nomura Securities International, Inc. 

Oppenheimer & Co. Inc. 

  
 B-1 

 EXHIBIT C 

[Letterhead of Company] 

[Insert date] 
 Continental Stock
Transfer & Trust Company 
 1 State Street Plaza, 30th Floor 

New York, New York 10004 
 Attn: Francis Wolf and Celeste Gonzalez

  

	 	Re:	 Trust Account No. [•] Withdrawal Instruction 

Ladies and Gentlemen: 
 Pursuant
to Section 1(j) of the Investment Management Trust Agreement between GigCapital3, Inc., a Delaware corporation (the “Company”) and Continental Stock Transfer & Trust Company
(“Trustee”), dated as of [•], 2020 (“Trust Agreement”), the Company hereby requests that you deliver to the Company $[•] of the interest income earned on the Property as of the date
hereof. Capitalized terms used but not defined herein shall have the meanings set forth in the Trust Agreement. 
 The Company needs such
funds to pay for the tax obligations as set forth on the attached tax return or tax statement. In accordance with the terms of the Trust Agreement, you are hereby directed and authorized to transfer (via wire transfer) such funds promptly upon your
receipt of this letter to the Company’s operating account at: 
 [WIRE INSTRUCTION INFORMATION] 

 

			
	 Very truly yours,

	
	 GIGCAPITAL3, INC.

		
	 By:
	 	
              
   

	 Name:

	 Title:

  

	cc:	 Nomura Securities International, Inc. 

Oppenheimer & Co. Inc. 

  
 C-1 

 EXHIBIT D 

[Letterhead of Company] 

[Insert date] 
 Continental Stock
Transfer & Trust Company 
 1 State Street Plaza, 30th Floor 

New York, New York 10004 
 Attn: Francis Wolf and Celeste Gonzalez

  

	 	Re:	 Trust Account No. [•] Stockholder Redemption Withdrawal Instruction

 Ladies and Gentlemen: 

Pursuant to Section 1(k) of the Investment Management Trust Agreement between GigCapital3, Inc., a Delaware corporation
(the “Company”) and Continental Stock Transfer & Trust Company (“Trustee”), dated as of [•], 2020 (“Trust Agreement”), the Company hereby requests that you deliver
$[                 ] of the principal and interest income earned on the Property as of the date hereof to a segregated account held by you for further transfer to the
institutions representing the Public Stockholders who have properly elected to have their shares of Public Common Stock redeemed by the Company as described below. Capitalized terms used but not defined herein shall have the meanings set forth in
the Trust Agreement. 
 The Company needs such funds to pay the Public Stockholders who have properly elected to have their shares of Public
Common Stock redeemed by the Company in connection with a stockholder vote to approve an amendment to the Company’s Amended and Restated Certificate of Incorporation that would affect the substance or timing of the Company’s obligation to
redeem 100% of the shares of Public Common Stock if the Company has not consummated an initial Business Combination within such time as is described in the Company’s Amended and Restated Certificate of Incorporation, or that would otherwise
affect provisions thereof relating to the Company’s pre-initial Business Combination activity or related stockholder rights. As such, you are hereby directed and authorized to transfer (via wire
transfer) such funds promptly upon your receipt of this letter to a segregated account held by you on behalf of such Public Stockholders. 
  

			
	 Very truly yours,

	
	 GIGCAPITAL3, INC.

		
	 By:
	 	
             

	 Name:

	 Title:

  

	cc:	 Nomura Securities International, Inc. 

Oppenheimer & Co. Inc. 

  
 D-1EX-10.7

 Exhibit 10.7 

GigCapital3, Inc. 
 1731
Embarcadero Road 
 Suite 200 

Palo Alto, CA 94303 

May 13, 2020                 

Mr. Walter Bradford Weightman 
 C/O GigCapital3, Inc. 

1731 Embarcadero Road 
 Suite 200 

Palo Alto, CA 94303 
 RE: Grant of Insider
Shares 
 Dear Brad: 
 We are pleased that
you (“you” or “Executive”) have agreed to serve as the Vice President and Chief Financial Officer of GigCapital3, Inc., a Delaware corporation (the “Company”). In exchange for
your future services as Vice President and Chief Financial Officer, you are hereby granted 5,000 shares (the “Insider Shares”) of the common stock, par value $0.0001 per share (“Common Stock”), of the
Company, pursuant to the terms of this agreement (this “Agreement”), as follows: 
 1. Grant of Insider
Shares. Solely in consideration for your future services as Vice President and Chief Financial Officer of the Company, the Company hereby grants the Insider Shares to you. The Company will deliver to you a certificate registered in your name
representing the Insider Shares. 
 2. Representations, Warranties and Agreements. 

2.1. Executive’s Representations, Warranties and Agreements. To induce the Company to issue the Insider Shares to Executive,
Executive hereby represents and warrants to the Company and agrees with the Company as follows: 
 2.1.1. No Government Recommendation
or Approval. Executive understands that no federal or state agency has passed upon or made any recommendation or endorsement of the offering of the Insider Shares. 

2.1.2. No Conflicts. The execution, delivery and performance of this Agreement and the consummation by Executive of the transactions
contemplated hereby do not violate, conflict with or constitute a default under (i) any agreement, indenture or instrument to which Executive is a party, (ii) any law, statute, rule or regulation to which the Executive is subject, or
(iii) any agreement, order, judgment or decree to which Executive is subject. 
 2.1.3. Organization and Authority. Executive
possesses all requisite power and authority necessary to carry out the transactions contemplated by this Agreement. Upon execution and delivery by Executive, this Agreement will be a legal, valid and binding agreement of Executive, enforceable
against Executive in accordance with its terms, except as such enforceability may be limited by applicable bankruptcy, insolvency, fraudulent conveyance or similar laws affecting the enforcement of creditors’ rights generally and subject to
general principles of equity (regardless of whether enforcement is sought in a proceeding at law or in equity). 
 2.1.4. Experience,
Financial Capability and Suitability. Executive is: (i) sophisticated in financial matters and is able to evaluate the risks and benefits of the acquisition of the Insider Shares and (ii) able to bear the economic risk of such
acquisition of the Insider Shares for an indefinite period of time because the Insider Shares have not been registered under the Securities Act of 1933, as amended (the “Securities Act”), and therefore cannot be resold unless
subsequently registered under the Securities Act or an exemption from such registration is available. Executive is capable of evaluating the merits and risks of such acquisition of the Insider Shares and has the capacity to protect his own
interests. Executive must bear the economic risk of the Insider Shares until the Insider Shares are sold pursuant to: (x) an effective registration statement under the Securities Act or (y) an exemption from registration available with
respect to such sale. Executive is able to bear the economic risks and to afford a complete loss of Executive’s investment in the Insider Shares. 

 2.1.5. Access to Information; Independent Investigation. Prior to the execution of
this Agreement, Executive has had the opportunity to ask questions of and receive answers from representatives of the Company concerning the Company, as well as the finances, operations, business and prospects of the Company, and the opportunity to
obtain additional information to verify the accuracy of all information so obtained. Executive has relied solely on Executive’s own knowledge and understanding of the Company and its business based upon Executive’s own due diligence
investigation and the information furnished pursuant to this paragraph. Executive understands that no person has been authorized to give any information or to make any representations which were not furnished pursuant to this
Section 2 and Executive has not relied on any other representations or information in making his investment decision, whether written or oral, relating to the Company, its operations or its prospects. 

2.1.6. Restrictions on Transfer; Shell Company. Executive understands the Insider Shares are being offered in a transaction not
involving a public offering within the meaning of the Securities Act. Executive understands the Insider Shares will be “restricted securities” as defined in Rule 144(a)(3) under the Securities Act and Executive understands that the
certificate representing the Insider Shares will contain a legend in respect of such restrictions . If in the future the Executive decides to offer, resell, pledge or otherwise transfer the Insider Shares, such Insider Shares may be offered, resold,
pledged or otherwise transferred only in accordance with the provisions of Sections 4.1 and 4.2 hereof. Executive agrees that if any transfer of its Insider Shares or any interest therein is proposed to be made, as a condition
precedent to any such transfer, Executive may be required to deliver to the Company an opinion of counsel satisfactory to the Company. Absent registration or an exemption, the Executive agrees not to resell the Insider Shares. Executive further
acknowledges that because the Company is a shell company, Rule 144 may not be available to the Executive for the resale of the Insider Shares until at least one year following consummation of the initial Business Combination of the Company, despite
technical compliance with the certain requirements of Rule 144 and the release or waiver of any contractual transfer restrictions. For the purposes of this Agreement, the term “Business Combination” means a merger, share
exchange, asset acquisition, stock purchase, recapitalization, reorganization or other similar business combination with one or more businesses or entities. 

3. Waiver of Liquidation Distributions; Redemption Rights. In connection with the Insider Shares granted pursuant to this Agreement,
the Executive hereby waives any and all right, title, interest or claim of any kind in or to any distributions by the Company from the trust account which will be established for the benefit of the Company’s public stockholders and into which
substantially all of the proceeds of the initial public offering of the Company’s equity securities (the “IPO”) will be deposited (the “Trust Account”), in the event of a liquidation of the
Company upon the Company’s failure to timely complete an initial Business Combination. For purposes of clarity, in the event the Executive purchases Common Stock in the IPO or in the aftermarket, any additional Common Stock so granted shall be
eligible to receive any liquidating distributions by the Company. However, in no event will the Executive have the right to redeem any shares of Common Stock into funds held in the Trust Account upon the successful completion of an initial Business
Combination. 
 4. Restrictions on Transfer. 

4.1. Securities Law Restrictions. In addition to the restrictions set forth in Section 4, Executive shall not
sell, transfer, pledge, hypothecate or dispose of all or any part of the Insider Shares prior to the date on which the Company completes its initial Business Combination. Notwithstanding the foregoing, Executive may transfer the Insider Shares to
Permitted Transferees as such term is defined in the Insider Letter (as defined below), provided that such Permitted Transferees must agree in writing to be bound by this Section 4 and such Insider Shares remain subject to
forfeiture as provided in Section 5. Executive agrees not to sell, transfer, pledge, hypothecate or otherwise dispose of all or any part of the Insider Shares unless, prior thereto (a) a registration statement on the
appropriate form under the Securities Act and applicable state securities laws with respect to the Insider Shares proposed to be transferred shall then be effective or (b) the Company has received an opinion from counsel reasonably satisfactory
to the Company, that such registration is not required because such transaction is exempt from registration under the Securities Act and the rules promulgated by the Securities and Exchange Commission thereunder and with all applicable state
securities laws. 

  
 2 

 4.2. Lock-ups. Executive acknowledges
that the Insider Shares will be subject to restrictions on transfer (the “Lock-ups”) contained in that certain letter agreement (the “Insider Letter”), of
even date herewith, by and between the Company, the undersigned and each other person who is, as of the date hereof, an executive officer, director or director nominee of the Company, which Insider Letter shall be substantially in the form to be
filed as an exhibit to the Registration Statement. 
 4.3. Restrictive Legends. All certificates representing the Insider Shares
shall have endorsed thereon legends substantially as follows: 
 “THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT
OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS AND NEITHER THE SECURITIES NOR ANY INTEREST THEREIN MAY BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED OF EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT OR SUCH
LAWS OR AN EXEMPTION FROM REGISTRATION UNDER SUCH ACT AND SUCH LAWS WHICH, IN THE OPINION OF COUNSEL, IS AVAILABLE.” 
 “THE SECURITIES
REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO LOCK-UP PROVISIONS AND MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED DURING THE TERM OF THE LOCKUP PERIOD. ANY TRANSFEREE SHALL BE SUBJECT
TO THE RESTRICTIONS SET FORTH IN THE GRANT AGREEMENT.” 
 4.4. Additional Insider Shares or Substituted Securities. In the event
of the declaration of a stock dividend, the declaration of a special dividend payable in a form other than Common Stock, a spin-off, a stock split, an adjustment in conversion ratio, a recapitalization or a
similar transaction affecting the Company’s outstanding Common Stock without receipt of consideration, any new, substituted or additional securities or other property which are by reason of such transaction distributed with respect to any
Insider Shares subject to Section 4 and Subsections 4.4-4.5, or into which such Insider Shares thereby become convertible shall immediately be subject to this
Section 4. Appropriate adjustments to reflect the distribution of such securities or property shall be made to the number or class of Insider Shares subject to this Section 4. 

4.5. Registration Rights. Executive acknowledges that the Insider Shares are being acquired pursuant to an exemption from the
registration requirements of the Securities Act and will become freely tradable only after certain conditions are met or they are registered pursuant to a Registration Rights Agreement to be entered into with the Company prior to the closing of the
IPO. 
 5. Forfeiture. If Executive ceases to serve as Vice President and Chief Financial Officer of the Company due to
Executive’s resignation or removal for cause at time prior to the date on which the Company completes its initial Business Combination, all of the Insider Shares granted hereunder will be automatically forfeited by Executive for no
consideration and immediately cancelled by the Company. 
 6. Voting and Redemption of Insider Shares. Executive agrees to
(i) vote the Insider Shares in favor of an initial Business Combination that the Company negotiates and submits for approval to the Company’s stockholders and shall not seek redemption with respect to such Insider Shares, (ii) not
redeem any Insider Shares in connection with a redemption or tender offer presented to the Company’s stockholders in connection with an initial Business Combination negotiated by the Company and (iii) comply with such other provisions as
set forth in the Insider Letter. 
 7.    Section 83(b) Election. Executive understands that
Section 83(a) of the Internal Revenue Code of 1986, as amended (the “Code”), taxes as ordinary income the difference between the amount paid for the Insider Shares and the Fair Market Value of the Insider Shares as of the date
any restrictions on the Insider Shares lapse. In this context, “restriction” means the obligation of Executive to forfeit the Insider Shares as set forth in Section 5 of this Agreement. Executive
understands that Executive may elect to be taxed at the time the Insider Shares are purchased, rather than when and as the restriction expires, by filing an election under Section 83(b) (an “83(b) Election”) of the Code with
the Internal Revenue Service within thirty (30) days from the date of grant. Even if the Fair Market Value of the Insider Shares at the time of the execution of this Agreement equals the amount paid for the Insider Shares, the election must be
made to avoid income under Section 83(a) in the future. Executive 

  
 3 

 
understands that failure to file such an election in a timely manner may result in adverse tax consequences for Executive. Executive further understands that an additional copy of such election
form should be filed with his federal income tax return for the calendar year in which the date of this Agreement falls. Executive acknowledges that the foregoing is only a summary of the effect of United States federal income taxation with respect
to purchase of the Insider Shares hereunder, and does not purport to be complete. Executive further acknowledges that the Company has directed Executive to seek independent advice regarding the applicable provisions of the Code, the income tax laws
of any municipality, state or foreign country in which Executive may reside, and the tax consequences of Executive’s death. 
 Executive agrees that he
will execute and deliver to the Company with this executed Agreement a copy of the Acknowledgment and Statement of Decision Regarding Section 83(b) Election (the “Acknowledgment”), attached hereto as
Exhibit A. Executive further agrees that Executive will execute and submit with the Acknowledgment a copy of the 83(b) Election, attached hereto as Exhibit B, if Executive has indicated in the
Acknowledgment his decision to make such an election. 
 8. Tax Consequences. Executive should obtain advice from an appropriate
independent professional adviser with respect to, and under the laws of Executive’s country of residence and/or citizenship, the taxation implications of the grant, issuance, purchase, retention, assignment, release, cancellation, sale or any
other disposal of the Shares (each, a “Trigger Event”). Executive should also obtain advice in respect of the taxation indemnity provisions under Section 7 below. 

9. Indemnification; Tax Indemnity. Each party shall indemnify the other against any loss, cost or damages (including reasonable
attorneys’ fees and expenses) incurred as a result of such party’s breach of any representation, warranty, covenant or agreement in this Agreement. Notwithstanding the foregoing or anything herein to the contrary, to the extent permitted
by law, Executive hereby agrees to indemnify and keep indemnified the Company and the Company as trustee for and on behalf of any affiliate entity, in respect of any liability or obligation of the Company and/or any affiliate entity to account for
income tax or any other taxation provisions under the laws of Executive’s country of citizenship and/or residence to the extent arising from a Trigger Event. 

10. Other Agreements. 

10.1. Further Assurances. Executive agrees to execute such further instruments and to take such further action as may reasonably be
necessary to carry out the intent of this Agreement. 
 10.2. Notices. All notices, statements or other documents which are required
or contemplated by this Agreement shall be in writing and delivered: (i) personally or sent by first class registered or certified mail, overnight courier service or facsimile or electronic transmission to the address designated in writing,
(ii) by facsimile to the number most recently provided to such party or such other address or fax number as may be designated in writing by such party and (iii) by electronic mail, to the electronic mail address most recently provided to
such party or such other electronic mail address as may be designated in writing by such party. Any notice or other communication so transmitted shall be deemed to have been given on the day of delivery, if delivered personally, on the business day
following receipt of written confirmation, if sent by facsimile or electronic transmission, one (1) business day after delivery to an overnight courier service or five (5) days after mailing if sent by mail. 

10.3. Entire Agreement. This Agreement, together with the Insider Letter and the Registration Rights Agreement, embodies the entire
agreement and understanding between the Executive and the Company with respect to the subject matter hereof and supersedes all prior oral or written agreements and understandings relating to the subject matter hereof. No statement, representation,
warranty, covenant or agreement of any kind not expressly set forth in this Agreement shall affect, or be used to interpret, change or restrict, the express terms and provisions of this Agreement. 

10.4. Modifications and Amendments. The terms and provisions of this Agreement may be modified or amended only by written agreement
executed by all parties hereto. 

  
 4 

 10.5. Waivers and Consents. The terms and provisions of this Agreement may be waived,
or consent for the departure therefrom granted, only by written document executed by the party entitled to the benefits of such terms or provisions. No such waiver or consent shall be deemed to be or shall constitute a waiver or consent with respect
to any other terms or provisions of this Agreement, whether or not similar. Each such waiver or consent shall be effective only in the specific instance and for the purpose for which it was given, and shall not constitute a continuing waiver or
consent. 
 10.6. Assignment. The rights and obligations under this Agreement may not be assigned by either party hereto without the
prior written consent of the other party. 
 10.7. Benefit. All statements, representations, warranties, covenants and agreements in
this Agreement shall be binding on the parties hereto and shall inure to the benefit of the respective successors and permitted assigns of each party hereto. Nothing in this Agreement shall be construed to create any rights or obligations except
among the parties hereto, and no person or entity shall be regarded as a third-party beneficiary of this Agreement. 
 10.8. Governing
Law. This Agreement and the rights and obligations of the parties hereunder shall be construed in accordance with and governed by the laws of New York applicable to contracts wholly performed within the borders of such state, without giving
effect to the conflict of law principles thereof. 
 10.9. Severability. In the event that any court of competent jurisdiction shall
determine that any provision, or any portion thereof, contained in this Agreement shall be unreasonable or unenforceable in any respect, then such provision shall be deemed limited to the extent that such court deems it reasonable and enforceable,
and as so limited shall remain in full force and effect. In the event that such court shall deem any such provision, or portion thereof, wholly unenforceable, the remaining provisions of this Agreement shall nevertheless remain in full force and
effect. 
 10.10. No Waiver of Rights, Powers and Remedies. No failure or delay by a party hereto in exercising any right, power or
remedy under this Agreement, and no course of dealing between the parties hereto, shall operate as a waiver of any such right, power or remedy of such party. No single or partial exercise of any right, power or remedy under this Agreement by a party
hereto, nor any abandonment or discontinuance of steps to enforce any such right, power or remedy, shall preclude such party from any other or further exercise thereof or the exercise of any other right, power or remedy hereunder. The election of
any remedy by a party hereto shall not constitute a waiver of the right of such party to pursue other available remedies. No notice to or demand on a party not expressly required under this Agreement shall entitle the party receiving such notice or
demand to any other or further notice or demand in similar or other circumstances or constitute a waiver of the rights of the party giving such notice or demand to any other or further action in any circumstances without such notice or demand. 

10.11. Survival of Representations and Warranties. All representations and warranties made by the parties hereto in this Agreement or
in any other agreement, certificate or instrument provided for or contemplated hereby, shall survive the execution and delivery hereof and any investigations made by or on behalf of the parties. 

10.12. No Broker or Finder. Each of the parties hereto represents and warrants to the other that no broker, finder or other financial
consultant has acted on its behalf in connection with this Agreement or the transactions contemplated hereby in such a way as to create any liability on the other. Each of the parties hereto agrees to indemnify and hold the other harmless from any
claim or demand for commission or other compensation by any broker, finder, financial consultant or similar agent claiming to have been employed by or on behalf of such party and to bear the cost of legal expenses incurred in defending against any
such claim. 
 10.13. Headings and Captions. The headings and captions of the various sections of this Agreement are for convenience
of reference only and shall in no way modify or affect the meaning or construction of any of the terms or provisions hereof. 
 10.14.
Counterparts. This Agreement may be executed in one or more counterparts, all of which when taken together shall be considered one and the same agreement and shall become effective when counterparts have been signed by each party and
delivered to the other party, it being understood that both parties need not sign the same counterpart. In the event that any signature is delivered by facsimile transmission or any other form of electronic

  
 5 

 
delivery, such signature shall create a valid and binding obligation of the party executing (or on whose behalf such signature is executed) with the same force and effect as if such signature
page were an original thereof. 
 10.15. Construction.    The words “include,”
“includes,” and “including” will be deemed to be followed by “without limitation.” Pronouns in masculine, feminine, and neuter genders will be construed to include any other gender, and words in the
singular form will be construed to include the plural and vice versa, unless the context otherwise requires. The words “this Agreement,” “herein,” “hereof,” “hereby,”
“hereunder,” and words of similar import refer to this Agreement as a whole and not to any particular section unless expressly so limited. The parties hereto intend that each representation, warranty, and covenant contained herein
will have independent significance. If any party hereto has breached any representation, warranty, or covenant contained herein in any respect, the fact that there exists another representation, warranty or covenant relating to the same subject
matter (regardless of the relative levels of specificity) which such party hereto has not breached will not detract from or mitigate the fact that such party hereto is in breach of the first representation, warranty, or covenant. 

10.16. Mutual Drafting. This Agreement is the joint product of the Executive and the Company and each provision hereof has been subject
to the mutual consultation, negotiation and agreement of such parties and shall not be construed for or against any party hereto. 

[Signature Page Follows] 

  
 6 

 If the foregoing accurately sets forth our understanding and agreement, please sign the
enclosed copy of this Agreement and return it to us. 
  

	
	
	Very truly yours,
	
	GIGCAPITAL3, INC.
	
	 /s/ Dr. Avi S. Katz

	Dr. Avi S. Katz, Executive Chairman of the
	Board and Chief Executive Officer

 Accepted and agreed this 13th day of May, 2020. 

 

	
	 /s/ Walter Bradford Weightman

	Walter Bradford Weightman

 Signature Page to Subscription Agreement – Executive 

 EXHIBIT A 

ACKNOWLEDGMENT AND STATEMENT OF DECISION 

REGARDING SECTION 83(b) ELECTION 

The undersigned (which term includes the undersigned’s spouse), a grantee of 5,000 shares (the “Insider Shares”) of
Common Stock of GigCapital3, Inc., a Delaware corporation (the “Company”), hereby states as follows: 

1.           The undersigned either [check and complete as applicable]: 

(a) ____ has consulted, and has been fully advised by, the undersigned’s own tax advisor, __________________________, whose business
address is _____________________________, regarding the federal, state and local tax consequences of acquiring the Insider Shares, and particularly regarding the advisability of making elections pursuant to Section 83(b) of the Internal Revenue
Code of 1986, as amended (the “Code”) and pursuant to the corresponding provisions, if any, of applicable state law; or 

(b) ____ has knowingly chosen not to consult such a tax advisor. 

2.            The undersigned hereby states that the undersigned has decided
[check as applicable]: 
 (a) ____ to make an election pursuant to Section 83(b) of the Code, and is submitting to the Company,
together with the undersigned’s executed Insider Shares Grant Agreement, an executed form entitled “Election Under Section 83(b) of the Internal Revenue Code of 1986;” or 

(b) ____ not to make an election pursuant to Section 83(b) of the Code. 

3.            Neither the Company nor any subsidiary or representative of the
Company has made any warranty or representation to the undersigned with respect to the tax consequences of the undersigned’s acceptance of Insider Shares or of the making or failure to make an election pursuant to Section 83(b) of the Code
or the corresponding provisions, if any, of applicable state law. 
  

							
	
Date:                  
                               
	 		 	  
	 	
		 		 	Walter Bradford Weightman	 	
				
	
Date:                  
                               
	 		 	  
	 	
		 		 	Spouse of Walter Bradford Weightman

 EXHIBIT B 

ELECTION UNDER SECTION 83(b) 

OF THE INTERNAL REVENUE CODE OF 1986 

The undersigned taxpayer hereby elects, pursuant to Section 83(b) of the Internal Revenue Code of 1986, as amended, to include in
taxpayer’s gross income for the current taxable year, the amount of any compensation taxable to taxpayer in connection with taxpayer’s receipt of the property described below: 

 

	1.	 The name, address, taxpayer identification number and taxable year of the undersigned are as follows:

 NAME OF TAXPAYER: _____________________ 

NAME OF SPOUSE: _____________________ 

ADDRESS:    _____________________________ 

                       
_____________________________ 
 IDENTIFICATION NO. OF TAXPAYER: _______________ 

IDENTIFICATION NO. OF SPOUSE: _______________ 

TAXABLE YEAR: _______________ 
  

	2.	 The property with respect to which the election is made is described as follows: 

_______________ shares of the Common Stock of GigCapital3, Inc., a Delaware corporation (the “Company”). 

 

	3.	 The date on which the property was transferred is: _______________ 

 

	4.	 The property is subject to the following restrictions: 

The shares are subject to forfeiture and cancellation by the Company for no consideration upon termination of taxpayer’s employment or
consulting relationship due to taxpayer’s resignation or termination for cause prior to the date of the Company’s initial Business Combination (as defined in the grant agreement). 

 

	5.	 The fair market value at the time of transfer, determined without regard to any restriction other than a
restriction which by its terms will never lapse, of such property is: $_______________. 

  

	6.	 The amount (if any) paid for such property: $______________ 

 The undersigned has submitted a copy of this statement to the person for whom the services were performed in
connection with the undersigned’s receipt of the above-described property. The transferee of such property is the person performing the services in connection with the transfer of said property. 

The undersigned understands that the foregoing election may not be revoked except with the consent of the Commissioner. 

 

			
	 Dated: ___________________
	 	  

		 	Walter Bradford Weightman
	 Dated: ___________________
	 	  

		 	Spouse of Walter Bradford Weightman

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