Document:

EX-10.9

 Exhibit 10.9 

THIS PROMISSORY NOTE (“NOTE”) HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”). THIS NOTE HAS
BEEN ACQUIRED FOR INVESTMENT ONLY AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF UNDER THE SECURITIES ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY IN FORM, SCOPE AND SUBSTANCE TO THE COMPANY
THAT SUCH REGISTRATION IS NOT REQUIRED. 
 PROMISSORY NOTE 

February 13, 2020 
 Principal
Amount: $100,000.00 
 GigCapital3, Inc., a Delaware corporation and blank check company (the “Maker”), promises to pay to the
order of GigAcquisitions3, LLC, a Delaware limited liability company, or its registered assigns or successors in interest (the “Payee”), or order, the principal sum of One-Hundred
Thousand Dollars ($100,000.00) in lawful money of the United States of America, on the terms and conditions described below. All payments on this Note shall be made by check or wire transfer of immediately available funds or as otherwise
determined by the Maker to such account as the Payee may from time to time designate by written notice in accordance with the provisions of this Note. 

1. Principal. The principal balance of this Note shall be payable by the Maker on the earlier of: (i) April 30, 2020, or
(ii) the date on which Maker consummates an initial public offering of its securities (the “IPO”). The principal balance may be prepaid at any time. Under no circumstances shall any individual, including but not limited to
any executive officer, director, employee or stockholder of the Maker, be obligated personally for any obligations or liabilities of the Maker hereunder. 

2. Interest. No interest shall accrue on the unpaid principal balance of this Note. 

3. Application of Payments. All payments shall be applied first to payment in full of any costs incurred in the collection of any sum due under
this Note, including (without limitation) reasonable attorney’s fees, then to the payment in full of any late charges and finally to the reduction of the unpaid principal balance of this Note. 

4. Events of Default. The following shall constitute an event of default (“Event of Default”): 

(a) Failure to Make Required Payments. Failure by Maker to pay the principal amount due pursuant to this Note within five (5) business days of
the date specified above. 
 (b) Voluntary Bankruptcy, Etc. The commencement by Maker of a voluntary case under any applicable bankruptcy,
insolvency, reorganization, rehabilitation or other similar law, or the consent by it to the appointment of or taking possession by a receiver, liquidator, assignee, trustee, custodian, sequestrator (or other similar official) of Maker or for any
substantial part of its property, or the making by it of any assignment for the benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the taking of corporate action by Maker in furtherance of any of
the foregoing. 
 (c) Involuntary Bankruptcy, Etc. The entry of a decree or order for relief by a court having jurisdiction in the premises in
respect of Maker in an involuntary case under any applicable bankruptcy, insolvency or other similar law, or appointing a receiver, liquidator, assignee, custodian, trustee, sequestrator (or similar official) of Maker or for any substantial part of
its property, or ordering the winding-up or liquidation of its affairs, and the continuance of any such decree or order unstayed and in effect for a period of 60 consecutive days. 

5. Remedies. 
 (a) Upon the occurrence of an
Event of Default specified in Section 4(a) hereof, Payee may, by written notice to Maker, declare this Note to be due immediately and payable, whereupon the unpaid principal amount of this Note, and all other amounts payable hereunder, shall
become immediately due and payable without presentment, demand,protest or other notice of any kind, all of which are hereby expressly waived, anything contained herein or in the documents evidencing the same to the contrary notwithstanding. 

 (b) Upon the occurrence of an Event of Default specified in Sections 4(b) and 4(c), the unpaid
principal balance of this Note, and all other sums payable with regard to this Note, shall automatically and immediately become due and payable, in all cases without any action on the part of Payee. 

6. Waivers. Maker and all endorsers and guarantors of, and sureties for, this Note waive presentment for payment, demand, notice
of dishonor, protest, and notice of protest with regard to the Note, all errors, defects and imperfections in any proceedings instituted by Payee under the terms of this Note, and all benefits that might accrue to Maker by virtue of any present or
future laws exempting any property, real or personal, or any part of the proceeds arising from any sale of any such property, from attachment, levy or sale under execution, or providing for any stay of execution, exemption from civil process, or
extension of time for payment; and Maker agrees that any real estate that may be levied upon pursuant to a judgment obtained by virtue hereof or any writ of execution issued hereon, may be sold upon any such writ in whole or in part in any order
desired by Payee. 
 7. Unconditional Liability. Maker hereby waives all notices in connection with the delivery, acceptance,
performance, default, or enforcement of the payment of this Note, and agrees that its liability shall be unconditional, without regard to the liability of any other party, and shall not be affected in any manner by any indulgence, extension of time,
renewal, waiver or modification granted or consented to by Payee, and consents to any and all extensions of time, renewals, waivers, or modifications that may be granted by Payee with respect to the payment or other provisions of this Note, and
agrees that additional makers, endorsers, guarantors, or sureties may become parties hereto without notice to Maker or affecting Maker’s liability hereunder. 

8. Notices. All notices, statements or other documents which are required or contemplated by this Note shall be made 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 or (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. 

9. Construction. THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF DELAWARE, WITHOUT REGARD TO CONFLICT
OF LAW PROVISIONS THEREOF. 
 10. Severability. Any provision contained in this Note which is prohibited or unenforceable in
any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction shall not
invalidate or render unenforceable such provision in any other jurisdiction. 
 11. Trust Waiver. Notwithstanding anything
herein to the contrary, the Payee hereby waives any and all right, title, interest or claim of any kind (“Claim”) in or to any distribution of or from the trust account to be established in which the proceeds of the IPO to be
conducted by the Maker (including the deferred underwriters discounts and commissions) and the proceeds of the sale of the units and underlying securities to be issued in a private placement to occur prior to the closing of the IPO are to be
deposited, as described in greater detail in the Registration Statement on Form S-1, and the prospectus contained therein, to be filed with the Securities and Exchange Commission in connection with
the IPO, and hereby agrees not to seek recourse, reimbursement, payment or satisfaction for any Claim against the trust account for any reason whatsoever. 

12. Amendment; Waiver. Any amendment hereto or waiver of any provision hereof may be made with, and only with, the written
consent of the Maker and the Payee. 

  
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 13. Assignment. No assignment or transfer of this Note or any rights or
obligations hereunder may be made by any party hereto (by operation of law or otherwise) without the prior written consent of the other party hereto and any attempted assignment without the required consent shall be void. 

[Signature page follows] 

  
 3 

 IN WITNESS WHEREOF, Maker, intending to be legally bound hereby, has caused this Note to be duly
executed by the undersigned as of the day and year first above written. 
  

	
	GIGCAPITAL3, INC.
	
	 /s/ Dr. Avi S. Katz

	 Dr. Avi S. Katz, Chairman of the Board

and Chief Executive Officer

  
 4EX-10.10

 Exhibit 10.10 

GigCapital3, Inc. 
 1731
Embarcadero Road, Suite 200, 
 Palo Alto, CA 94303 

February 14, 2020 
 GigFounders, LLC 

1731 Embarcadero Road, Suite 200, 
 Palo Alto, CA 94303 

Re: Administrative Services Agreement 

Gentlemen: 
 This letter will confirm our
agreement that, commencing on the date the securities of GigCapital3, Inc. (the “Company”) are first listed on the New York Stock Exchange (the “Listing Date”), pursuant to a Registration Statement on Form S-1 and prospectus filed with the Securities and Exchange Commission (the “Registration Statement”) and continuing until the earlier of the consummation by the Company of an initial business
combination or the Company’s liquidation (in each case as described in the Registration Statement) (such earlier date hereinafter referred to as the “Termination Date”), GigFounders, LLC (“GigFounders”) shall
make available to the Company, at 1731 Embarcadero Road, Suite 200, Palo Alto, CA 94303 (or any successor location), certain office space, utilities, and general office, receptionist and secretarial support and other administrative services as may
be reasonably required by the Company. In exchange therefor, the Company shall pay GigFounders the sum of $20,000 per month on the Listing Date and continuing monthly thereafter and will be entitled to be reimbursed for any out-of-pocket expenses until the Termination Date. 
 GigFounders
hereby irrevocably waives any and all right, title, interest, causes of action and claims of any kind (each, a “Claim”) in or to, and any and all right to seek payment of any amounts due to it out of, the trust account established
for the benefit of the public stockholders of the Company and into which substantially all of the proceeds of the Company’s initial public offering will be deposited (the “Trust Account”), and hereby irrevocably waives any
Claim it may have in the future as a result of, or arising out of, this agreement, which Claim would reduce, encumber or otherwise adversely affect the Trust Account or any monies or other assets in the Trust Account, and further agrees not to seek
recourse, reimbursement, payment or satisfaction of any Claim against the Trust Account or any monies or other assets in the Trust Account for any reason whatsoever. 

This letter agreement constitutes the entire agreement and understanding of the parties hereto in respect of its subject matter and supersedes
all prior understandings, agreements, or representations by or among the parties hereto, written or oral, to the extent they relate in any way to the subject matter hereof or the transactions contemplated hereby. 

This letter agreement may not be amended, modified or waived as to any particular provision, except by a written instrument executed by all
parties hereto. 
 No party hereto may assign either this letter agreement or any of its rights, interests, or obligations hereunder without
the prior written approval of the other party. Any purported assignment in violation of this paragraph shall be void and ineffectual and shall not operate to transfer or assign any interest or title to the purported assignee. 

[Signature page follows] 

 This letter agreement, the entire relationship of the parties hereto, and any litigation
between the parties (whether grounded in contract, tort, statute, law or equity) shall be governed by, construed in accordance with, and interpreted pursuant to the laws of the State of New York, without giving effect to its choice of laws
principles. 
  

			
	Very truly yours,
	
	GIGCAPITAL3, INC.
		
	By:	 	/s/ Dr. Avi S. Katz
		 	Name: Dr. Avi S. Katz
		 	Title: President, Chief Executive Officer, Secretary and Chairman of the Board

  

			
	AGREED TO AND ACCEPTED BY:
	
	GIGFOUNDERS, LLC
		
	By:	 	/s/ Dr. Avi S. Katz
		 	Name: Dr. Avi S. Katz
		 	Title: Sole Managing Member

 [Signature Page to Administrative Services Agreement]

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