Document:

EX-10.2

 Exhibit 10.2 

[DATE], 2020 
 GigCapital3, Inc.

 1731 Embarcadero Rd., Suite 200 
 Palo Alto, CA 94303 

Nomura Securities International, Inc. 
 Worldwide Plaza 

309 West 49th Street 
 Oppenheimer & Co. Inc. 

85 Broad Street 
 New York, New York 10004 

Re: Initial Public Offering 
 Ladies
and Gentlemen: 
 This letter agreement (this “Letter Agreement”) is being delivered to you in accordance with the
Underwriting Agreement (the “Underwriting Agreement”) entered into by and between GigCapital3, Inc., a Delaware corporation (the “Company”), and Nomura Securities International, Inc. and
Oppenheimer & Co. Inc., as representatives (the “Representatives”) of the several underwriters named therein (the “Underwriters”), relating to an underwritten initial public offering (the
“IPO”) of 20,000,000 units (the “Initial Units”) of the Company, and up to an additional 3,000,000 units (together with the Initial Units, the “Units”) in the event that the
Underwriters’ 45-day over-allotment option is exercised in full or in part, each Unit consisting of one share of the Company’s common stock, par value $0.0001 per share (“Common
Stock” and such shares included in the Units, the “Offering Shares”), and one-half of one redeemable warrant to purchase one share of Common Stock at a price of $11.50
per share, subject to adjustment (the warrants included in the Units sold, the “Offering Warrants”). Capitalized terms used herein but not defined in context are defined in paragraph 12 hereof. 

In order to induce the Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the IPO, and in recognition
of the benefit that such IPO will confer upon the undersigned, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, each of the undersigned individuals, being an executive officer or director
of the Company and signing this Letter Agreement in his or her personal capacity and not on behalf of the Company, hereby agrees with the Company and the Underwriters as follows: 

1. With respect to stockholder votes and associated conversion rights, 

(a) if the Company solicits stockholder approval of a Business Combination via a proxy solicitation, then the undersigned will vote all shares
of then outstanding Common Stock beneficially owned by him/her in favor of such Business Combination; provided, that (i) the undersigned acknowledges and agrees that prior to entering into a Business Combination with a target
business that is affiliated with any Insiders, such transaction must be approved by a majority of the Company’s disinterested independent directors and the Company must obtain an opinion from an independent investment banking firm, or another
independent entity that commonly renders valuation opinions on the type of target business the Company is seeking to acquire, that such Business Combination is fair to the Company’s unaffiliated stockholders from a financial point of view, and
(ii) no Insider will be entitled to receive or accept a finder’s fee or any other compensation in the event such Insider originates a Business Combination; 

(b) the undersigned hereby agrees not to propose for a stockholder approval any amendment to the Amended and Restated Certificate of
Incorporation that would (i) affect the substance or timing of the Company’s obligation to redeem 100% of the Offering Shares if the Company does not complete a Business Combination within 24 months of the closing of the IPO, or
(ii) alter its provisions relating to the Company’s pre-Business Combination activity or the related stockholders’ rights prior to the consummation of such Business Combination, unless, in
each case, the Company provides the holders of any Offering Shares with the opportunity to redeem their Offering Shares upon the approval of any such amendment. Such redemption must be at
a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account including interest (which interest shall be net of franchise and income taxes payable by the
Company), divided by the number of then outstanding Offering Shares; and 

 (c) the undersigned will not redeem any shares of Common Stock beneficially owned by him/her
in connection with a solicitation for stockholder approval described in either of clauses (a) or (b) above, or sell any such shares of Common Stock in a tender offer undertaken by the Company in connection with a Business Combination. 

2. If the Company fails to consummate a Business Combination within 24 months of the completion of the IPO, or such other time period as may
be set forth in the Amended and Restated Certificate of Incorporation, the undersigned will cause the Company to (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible, but not more than 10
business days thereafter, redeem the Offering Shares at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the Trust
Account (which interest shall be net of taxes payable by the Company and up to $100,000 of interest to pay dissolution expenses), divided by the number of then outstanding Offering Shares, which redemption will completely extinguish the
holders’ rights as stockholders (including the right to receive further liquidation distributions, if any), and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the Company’s remaining
stockholders and the Company’s board of directors, dissolve and liquidate, subject in the cases of clauses (ii) and (iii) to the Company’s obligations under Delaware law to provide for claims of creditors and other requirements
of applicable law. 
 3. The undersigned hereby waives any and all right, title, interest or claim of any kind the undersigned may have in
the future in or to any distribution of the Trust Account and any remaining assets of the Company as a result of, or arising out of, any contracts or agreements with the Company and will not seek recourse against the Trust Account for any reason
whatsoever; provided, that the foregoing waiver shall not apply with respect to liquidating distributions from the Trust Account made in connection with any Offering Shares purchased by the undersigned or its Affiliates during the
IPO or on the open market after the completion of the IPO if the Company fails to complete a Business Combination within 24 months of the completion of the IPO. The undersigned acknowledges and agrees that there will be no distribution from the
Trust Account with respect to any of the Offering Warrants, all rights of which will terminate upon the Company’s liquidation. 
 4. In
order to minimize potential conflicts of interest that may arise from multiple corporate affiliations, 
 (a) the undersigned shall present
to the Company for its consideration, prior to presentation to any other entity, any target business in the technology, media and telecommunications industry that has a fair market value of at least 80% of the assets held in the Trust Account
(excluding the deferred underwriting commissions and any taxes payable on interest earned), subject to any pre-existing fiduciary or contractual obligations the undersigned might have; and 

(b) the undersigned hereby acknowledges and agrees that (i) each of the Underwriters and the Company may be irreparably injured in the
event of a breach of any of the obligations contained in this Letter Agreement, (ii) monetary damages may not be an adequate remedy for such breach, and (iii) the non-breaching party shall be
entitled to injunctive relief, in addition to any other remedy that such party may have in law or in equity, in the event of such breach. 

5. None of the undersigned or any of their Affiliates will be entitled to receive, and none of them may accept, any compensation or other cash
payment prior to, or for services rendered in order to effectuate, the consummation of the Business Combination, except for the following: 

(a) GigAcquisitions3, LLC, a Delaware limited liability company (“Sponsor”), an Affiliate of Dr. Katz, and its
Affiliates may receive compensation for administrative services and office space, as provided for under that certain Administrative Services Agreement, dated as of February 14, 2020, between the Company and GigFounders, LLC; 

(b) Sponsor may receive amounts due under that certain promissory note in the aggregate principal amount of $100,000, dated as of
February 24, 2020, issued by the Company in favor of Sponsor; 
 (c) Mr. Weightman may receive compensation for her services as
Chief Financial Officer of the Company, as provided for under that certain Strategic Services Agreement and Confidential Information and Invention Assignment Agreement with the Company dated as of February 14, 2020; 

 (d) each of Messrs. Betti-Berutto, Wang and Weightman each may receive 5,000 shares of
Common Stock (the “Insider Shares”) as consideration for of the future services as Hardware Chief Technical Officer, Software Chief Technical Officer, and Vice President and Chief Financial Officer, respectively; and 

(e) any of the undersigned and their Affiliates may receive reimbursement
of out-of-pocket expenses incurred by them in connection with certain activities on behalf of the Company, such as identifying and investigating possible
business targets and business combinations, as well as advisory fees to directors pertaining to board committee service and extraordinary administrative and analytical services, and repayment upon consummation of a Business Combination of any loans
which may be made by them or by their Affiliates to finance transaction costs in connection with an intended Business Combination. While the terms of any such loans have not been determined nor have any written agreements been executed with respect
thereto, it is acknowledged and agreed that up to $1,500,000 of any such loans may be convertible into units of the post-business combination entity at a price of $10.00 per unit at the option of the lender. 

6. The undersigned agrees to continue to serve in his or her current capacity as an executive officer and/or director of the Company until the
earlier of the consummation by the Company of a Business Combination or its liquidation. The biographical information of the undersigned previously furnished to the Company and the Representatives is true and accurate in all respects, does not omit
any material information with respect to the undersigned’s background and contains all of the information required to be disclosed pursuant to Item 401 of Regulation S-K, promulgated under the
Securities Act. The undersigned’s FINRA Questionnaire previously furnished to the Company and the Representative is also true and accurate in all respects. 

7. The undersigned represents and warrants that (i) he or she is not subject to, or a respondent in, any legal action for any injunction, cease-and-desist order, or order or stipulation to desist or refrain from any act or practice relating to the offering of securities in any jurisdiction;
(ii) he or she has never been convicted of or pleaded guilty to any crime involving any fraud, relating to any financial transaction or handling of funds of another person, or pertaining to any dealings in any securities and he or she is not
currently a defendant in any such criminal proceeding; and (iii) he or she has never been suspended or expelled from membership in any securities or commodities exchange or association, or had a securities or commodities license or registration
denied, suspended or revoked. 
 8. The undersigned agrees that he or she shall not Transfer (as defined below) any Insider Shares of the
Company held by him or her or by his or her Affiliates until the earlier of (i) twelve months after the completion of a Business Combination or (ii) the date on which, subsequent to a Business Combination, (x) the last sale price of
the Common Stock equals or exceeds $12.50 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day
period commencing at least 90 days after a Business Combination, or (y) the Company completes a liquidation, merger, stock exchange or other similar transaction that results in all of the Company’s stockholders having the right to exchange
their shares of Common Stock for cash, securities or other property (the “Lock-up Period”). Notwithstanding the foregoing, during the Lock-up Period, Transfers of Insider Shares are permitted to be made (a) amongst Sponsor and its Affiliates, to the Company’s executive officers or directors, or to any Affiliate or family
member of any of the Company’s executive officers or directors; (b) in the case of an entity, as a distribution to its partners, stockholders or members upon its liquidation; (c) in the case of an individual, (1) by bona fide
gift to such person’s immediate family or to a trust, the beneficiary of which is a member of such person’s immediate family, an Affiliate of such person or to a charitable organization, (2) by virtue of the laws of descent and
distribution upon death of such person, (3) pursuant to a qualified domestic relations order; (d) by certain pledges to secure obligations incurred in connection with purchases of the Company’s securities; (e) through private
sales or transfers made in connection with the consummation of a Business Combination at prices no greater than the price at which such securities were originally purchased; (f) in the case of an Underwriter, to such Underwriter’s
Affiliates or any entity controlled by such Underwriter; or (g) to the Company for no value for cancellation in connection with the consummation of a Business Combination; provided, that, in each such case (except clause
(g)), these permitted transferees must enter into a written agreement agreeing to be bound by these transfer restrictions and the other terms described in this Letter Agreement to the extent and for the duration that such terms remain in effect at
the time of the Transfer. 
 9. Notwithstanding the foregoing paragraph 8, each of the undersigned agrees that during the period commencing
on the effective date of the Underwriting Agreement and ending 180 days after such date, none of them nor any of their Affiliates, may, without the prior written approval of the Underwriters, offer, sell, contract to sell, pledge, or otherwise
dispose of, directly or indirectly, or hedge the Company’s Units, warrants, shares of Common 

 
Stock or any other securities convertible into or exchangeable or exercisable for shares of Common Stock. The foregoing sentence shall not apply to the registration of the offer and sale of Units
contemplated by the Underwriting Agreement and the sale of the Units to the Underwriters. 
 10. The undersigned has full right and power,
without violating any agreement by which he or she is bound, to enter into this Letter Agreement and to serve as an executive officer and/or director of the Company. 

11. This Letter Agreement shall be governed by and construed and enforced in accordance with the laws of the State of New York, without giving
effect to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction. The undersigned hereby (i) agrees that any action, proceeding or claim against him or her arising out of or relating in
any way to this Letter Agreement (a “Proceeding”) shall be brought and enforced in the courts of the State of New York of the United States of America for the Southern District of New York, and irrevocably submits to such
jurisdiction, which jurisdiction shall be exclusive, (ii) waives any objection to such exclusive jurisdiction and that such courts represent an inconvenient forum, and (iii) irrevocably agrees to appoint Crowell & Moring LLP as
agent for the service of process in the State of New York to receive, for the undersigned and on his or her behalf, service of process in any Proceeding. If for any reason such agent is unable to act as such, the undersigned will promptly notify the
Company and the Representative and appoint a substitute agent acceptable to each of the Company and the Representative within 30 days and nothing in this Letter Agreement will affect the right of either party to serve process in any other manner
permitted by law. 
 12. As used herein, (i) “Affiliate” has the meaning set forth in Rule 144(a)(1) under the
Securities Act; (ii) “Amended and Restated Certificate of Incorporation” refers to the Amended and Restated Certificate of Incorporation of the Company, as filed with the Secretary of State of the State of Delaware, as the
same may be amended from time to time; (iii) a “Business Combination” shall mean a merger, share exchange, asset acquisition, stock purchase, recapitalization, reorganization or other similar business combination with
one or more businesses or entities; (iv) “Exchange Act” means the Securities Exchange Act of 1934, as amended; (v) “Insiders” means all executive officers and directors of the Company immediately prior
to the IPO, as well as Sponsor and any of its Affiliates; (vi) the “Registration Statement” shall mean the Registration Statement on Form S-1 (Registration No. 333-236626) filed by the Company with the SEC in connection with the IPO, as the same may be amended or supplemented; (vii) the “Securities Act” means the Securities Act of
1933, as amended; (viii) the “SEC” means the United States Securities and Exchange Commission; (ix) “Transfer” means (a) the sale of, offer to sell, contract or agreement to sell,
hypothecate, pledge, grant of any option to purchase or otherwise dispose of or agreement to dispose of, directly or indirectly, or establishment or increase of a put equivalent position or liquidation with respect to or decrease of a call
equivalent position within the meaning of Section 16 of the Exchange Act and the rules and regulations promulgated thereunder with respect to any security, (b) the entry into any swap or other arrangement that transfers to another, in
whole or in part, any of the economic consequences of ownership of any security, whether any such transaction is to be settled by delivery of such securities, in cash or otherwise, or (c) the public announcement of any intention to effect any
transaction specified in clause (a) or (b); and (x) “Trust Account” means the trust account into which a portion of the net proceeds of the Company’s IPO will be deposited. 

13. This Letter Agreement constitutes the entire agreement and understanding of the parties hereto in respect of the subject matter hereof 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 changed, amended, modified or waived (other than to correct a typographical error) as to any particular provision, except by a written instrument executed by all parties hereto. 

14. The undersigned acknowledges and understands that the Underwriters and the Company will rely upon the agreements, representations and
warranties set forth herein in proceeding with the IPO. Nothing contained herein shall be deemed to render the Underwriters a representative of, or a fiduciary with respect to, the Company, its stockholders or any creditor or vendor of the Company
with respect to the subject matter hereof. 
 15. This Letter Agreement shall be binding on the undersigned and such person’s
respective successors, heirs, personal representatives and assigns. This Letter Agreement shall terminate on the earlier of (i) the Company’s consummation of a Business Combination, or (ii) the liquidation of the
Company; provided, that such termination shall not relieve the undersigned from liability for any breach of this agreement prior to its termination. 

16. This Letter Agreement may be executed in counterparts, each of which when so executed shall be deemed to be an original and all of which
when taken together shall constitute one and the same instrument. The words 

 
“execution,” signed,” “signature,” and words of like import in this Letter Agreement shall include images of manually executed signatures transmitted by facsimile or
other electronic format (including, without limitation, “pdf”, “tif” or “jpg”) and other electronic signatures (including, without limitation, DocuSign and AdobeSign). The use of electronic signatures and electronic
records (including, without limitation, any contract or other record created, generated, sent, communicated, received, or stored by electronic means) shall be of the same legal effect, validity and enforceability as a manually executed signature or
use of a paper-based record-keeping system to the fullest extent permitted by applicable law, including the Federal Electronic Signatures in Global and National Commerce Act, the New York State Electronic Signatures and Records Act and any other
applicable law, including, without limitation, any state law based on the Uniform Electronic Transactions Act or the Uniform Commercial Code. 

[Signature Page Follows] 

 
	
	Very truly yours,
	
	  

	 Dr. Avi S. Katz, Chairman of the Board,

President, Chief Executive Officer, and
 Secretary of GigCapital3,
Inc.

	
	  

	Brad Weightman
	Chief Financial Officer of GigCapital3, Inc.
	
	  

	John Mikulsky, Director of GigCapital3 Inc.
	
	  

	Neil Miotto, Director of GigCapital3, Inc.
	
	  

	Andrea Betti-Berutto, Director of GigCapital3, Inc.
	
	  

	Raluca Dinu, Director of GigCapital3, Inc.
	
	  

	Peter Wang, Director of GigCapital3, Inc.

  

	
	Accepted and agreed this [DAY]th day of [MONTH], 2020.
	GIGCAPITAL3, INC.
	
	  

	 Dr. Avi S. Katz, Chairman of the Board

and Chief Executive Officer

  

	
	NOMURA SECURITIES INTERNATIONAL, INC.
	
	  

	 By:
 Title:

	
	OPPENHEIMER & CO. INC.
	
	  

	 By:
 Title:

 Signature page to Insider Letter (Executive Officers and Directors)EX-10.4

    
 Exhibit 10.4

 
 UNIT PURCHASE AGREEMENT
  

This UNIT PURCHASE AGREEMENT (this “Agreement”) is made as of the [●] day of [●] 2020, by and among GigCapital3,
Inc., a Delaware corporation (the “Company”), and GigAcquisitions3, LLC (“Subscriber”).
  

WHEREAS, the Company desires to sell to Subscriber on a private placement basis (the “Sale”) an aggregate of 650,000 private
units (the “Initial Private Units”) of the Company, and up to an additional 39,000 private units (the “Additional Private Units,” and, together with the Initial Private Units, the “Private
Units”) of the Company in the event that the underwriters’ 45-day over-allotment option (“Over-Allotment Option”) is exercised in full or in part, for a purchase price of $10.00 per Private Unit, each Private Unit
comprised of one share of common stock of the Company, par value $0.0001 per share (“Common Stock”), and one-half of one warrant, each whole warrant exercisable to purchase one share of Common Stock (“Warrant”).
The shares of Common Stock underlying the Warrants are hereinafter referred to as the “Warrant Shares.” The shares of Common Stock underlying the Private Units (excluding the Warrant Shares) are hereinafter referred to as the
“Private Shares.” The Warrants underlying the Private Units are hereinafter referred to as the “Private Warrants.” The Private Units, Private Shares, Private Warrants and Warrant Shares, collectively, are
hereinafter referred to as the “Securities.” Each whole Private Warrant is exercisable to purchase one share of Common Stock at an exercise price of $11.50, subject to the adjustments as set forth in the Warrant Agreement (as
defined below), during the period commencing on the later of (i) twelve (12) months from the date of the closing of the Company’s initial public offering of units (the “IPO”) and (ii) 30 days following
the consummation of the Company’s initial business combination (the “Business Combination”), as such term is defined in the registration statement in connection with the IPO, as amended at the time it becomes effective (the
“Registration Statement”), filed with the Securities and Exchange Commission (“SEC”), and expiring on the fifth anniversary of the consummation of the Business Combination (provided that so long as the Private
Warrants are held by Subscriber, its designees or affiliates, Subscriber, its designees or affiliates will not be permitted to exercise such Private Warrants after the five year anniversary of the effective date of the Registration Statement);
and
  
 WHEREAS, Subscriber
wishes to purchase the Initial Private Units and up to the amount of Additional Private Units, at the Initial Purchase Price (as defined below), and the Company wishes to accept such subscription from Subscriber.

 
 NOW, THEREFORE, in
consideration of the premises and the mutual covenants hereinafter set forth and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Company and Subscriber hereby agree as follows:

 

		1.	Agreement to Subscribe.

  

1.1.         
Purchase and Issuance of the Private Units.
  

		(a)	Upon the terms and subject to the conditions of this Agreement, Subscriber hereby agrees to purchase from the Company, and the Company hereby agrees to sell to Subscriber, on the initial Closing Date 

 
 
 

  

 

  

(as defined below) the Initial Private Units in consideration of the payment of the Initial Purchase Price. On the initial
Closing Date, the Company shall, at its option, deliver to Subscriber the certificates representing the Securities purchased by Subscriber or effect such delivery in book-entry form.

 

		(b)	Subscriber hereby agrees to purchase up to the amount of Additional Private Units $10.00 per Additional Private Unit. The purchase and issuance of the Additional Private Units shall occur only in the event that the
Over-Allotment Option is exercised in full or in part. The total number of Additional Private Units to be purchased hereunder shall be in the same proportion as the proportion of the Over-Allotment Option that is exercised. The purchase of
Additional Private Units shall occur simultaneously with the consummation of any portion of the Over-Allotment Option.

 
 1.2.         Purchase Price.

 

		(a)	As payment in full for the Initial Private Units being purchased under this Agreement, Subscriber shall pay $6,500,000 (the “Initial Purchase Price”) by wire transfer of immediately available funds or
by such other method as may be reasonably acceptable to the Company, to the trust account (the “Trust Account”) at a financial institution to be chosen by the Company, maintained by Continental Stock Transfer & Trust Company,
acting as trustee (“Continental”), on or prior to the initial Closing Date.

  

		(b)	As payment in full for the Additional Private Units being purchased under this Agreement, Subscriber shall pay $10.00 per Additional Private Unit being purchased by wire transfer of immediately available funds or by such
other method as may be reasonably acceptable to the Company, to the Trust Account at a financial institution chosen by the Company, maintained by Continental, on or prior to the Closing Date of the Over-Allotment Option.

 
 1.3.         Closing. The closing of the purchase and sale of the Initial Private Units shall take place simultaneously with the
closing of the IPO and the closing of the purchase and sale of Additional Private Units shall take place simultaneously with any closing of the Over-Allotment Option (each, a “Closing Date”). Each of the closings of the purchase
and sale of the Private Units shall take place at the offices of Crowell & Moring LLP, 3 Embarcadero Center, 26th Floor, San Francisco, California 94111, or such other place as may be agreed upon by the parties hereto.

 
 1.4.         Conditions to Closing. The obligation of Subscriber to purchase and pay for the Private Units as provided herein shall
be contingent upon, and concurrent with, the consummation of the IPO.
  

 

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1.5.         
Termination. This Agreement and each of the obligations of the undersigned shall be null and void and without effect if a Closing does not occur prior to [December 31, 2020] or if that certain Underwriting Agreement, dated as of the date
hereof, by and among the Company and Nomura Securities International, Inc. and Oppenheimer & Co. Inc., as representatives of the underwriters named therein (the “Underwriting Agreement”), is terminated for any reason.

 

		2.	Representations and Warranties of the Subscriber.

  

Subscriber represents and warrants to the Company that:

 
 2.1.         No Government Recommendation or Approval. Subscriber understands that no federal or state agency has passed upon or made
any recommendation or endorsement of the Company or the Sale of the Securities.
  

2.2.         
Accredited Investor. Subscriber represents that it is an “accredited investor” as such term is defined in Rule 501(a) of Regulation D under the Securities Act of 1933, as amended (the “Securities Act”), and
acknowledges that the sale contemplated hereby is being made in reliance, among other things, on a private placement exemption to “accredited investors” under the Securities Act and similar exemptions under state law.

 
 2.3.         Intent. Subscriber is purchasing the Securities solely for investment purposes, for Subscriber’s own account
(and/or for the account or benefit of its members or affiliates, as permitted, pursuant to the terms hereof), and not with a view to the distribution thereof and Subscriber has no present arrangement to sell the Securities to or through any person
or entity except as may be permitted hereunder. Subscriber shall not engage in hedging transactions with regard to the Securities unless in compliance with the Securities Act of 1933, as amended (the “Securities Act”).

 
 2.4.         Restrictions on Transfer. Subscriber acknowledges and understands the Private Units are being offered in a transaction
not involving a public offering in the United States within the meaning of the Securities Act. The Securities have not been registered under the Securities Act and, if in the future Subscriber decides to offer, resell, pledge or otherwise transfer
the Securities, such Securities may be offered, resold, pledged or otherwise transferred only (i) pursuant to an effective registration statement filed under the Securities Act, (ii) pursuant to an exemption from registration under
Rule 144 promulgated under the Securities Act, if available, or (iii) pursuant to any other available exemption from the registration requirements of the Securities Act, and in each case in accordance with any applicable securities laws of
any state or any other jurisdiction. Notwithstanding the foregoing, Subscriber acknowledges and understands the Securities are subject to transfer restrictions as described in Section 8 hereof. Subscriber agrees that if any transfer of its
Securities or any interest therein is proposed to be made, as a condition precedent to any such transfer, Subscriber may be required to deliver to the Company an opinion of counsel satisfactory to the Company with respect to such transfer. Absent
registration or another available exemption from registration, Subscriber agrees it will not resell the Securities (unless otherwise permitted pursuant to the terms hereof). Subscriber further acknowledges that because the Company is a shell
company, Rule 144 may not be available to Subscriber for the resale of the Securities until the one year anniversary following consummation of the Business Combination of the Company, despite technical compliance with the requirements of
Rule 144 and the release or waiver of any contractual transfer restrictions.
  

 

 
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2.5.         
Sophisticated Investor.
  

		(a)	Subscriber is sophisticated in financial matters and is able to evaluate the risks and benefits of the investment in the Securities.

 

		(b)	Subscriber is aware that an investment in the Securities is highly speculative and subject to substantial risks because, among other things, (i) the Securities are subject to transfer restrictions and have not been
registered under the Securities Act and therefore cannot be sold unless subsequently registered under the Securities Act or an exemption from such registration is available and (ii) Subscriber has waived its redemption rights with respect to
the Securities as set forth in Section 5 hereof, and the Securities held by Subscriber are not entitled to, and have no right, interest or claim to any monies held in the Trust Account, and accordingly Subscriber may suffer a loss of a portion
or all of its investment in the Securities. Subscriber is able to bear the economic risk of its investment in the Securities for an indefinite period of time.

 
 2.6.         Organization and Authority. Subscriber is duly organized, validly existing and in good standing under the laws of its
state of incorporation or formation and it possesses all requisite power and authority necessary to carry out the transactions contemplated by this Agreement.

 
 2.7.         Authority. This Agreement has been validly authorized, executed and delivered by Subscriber and is a valid and binding
agreement enforceable in accordance with its terms, subject to the general principles of equity and to bankruptcy or other laws affecting the enforcement of creditors’ rights generally.

 
 2.8.         No Conflicts. The execution, delivery and performance of this Agreement and the consummation by Subscriber of the
transactions contemplated hereby do not violate, conflict with or constitute a default under (i) Subscriber’s charter documents, (ii) any agreement or instrument to which Subscriber is a party or (iii) any law, statute, rule or
regulation to which Subscriber is subject, or any agreement, order, judgment or decree to which Subscriber is subject.
  

2.9.         No
Legal Advice from Company. Subscriber acknowledges it has had the opportunity to review this Agreement and the transactions contemplated by this Agreement and the other agreements entered into between the parties hereto with Subscriber’s own
legal counsel and investment and tax advisors. Except for any statements or representations of the Company made in this Agreement and the other agreements entered into between the parties hereto, Subscriber is relying solely on such counsel and
advisors and not on any statements or representations of the Company or any of its representatives or agents for legal, tax or investment advice with respect to this investment, the transactions contemplated by this Agreement or the securities laws
of any jurisdiction.
  

 

 
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2.10.       Reliance on
Representations and Warranties. Subscriber understands the Private Units are being offered and sold to Subscriber in reliance on exemptions from the registration requirements under the Securities Act, and analogous provisions in the laws and
regulations of various states, and that the Company is relying upon the truth and accuracy of the representations, warranties, agreements, acknowledgments and understandings of Subscriber set forth in this Agreement in order to determine the
applicability of such provisions.
  

2.11.       No General
Solicitation. Subscriber is not subscribing for the Private Units as a result of or subsequent to any general solicitation or general advertising, including but not limited to any advertisement, article, notice or other communication published in
any newspaper, magazine, or similar media or broadcast over television or radio, or presented at any seminar or meeting or in the Registration Statement.

 
 2.12.       Legend. Subscriber acknowledges and agrees the book-entries evidencing each of the Securities shall bear a restrictive legend (the
“Legend”), in form and substance substantially as set forth in Section 4 hereof.
  

		3.	Representations, Warranties and Covenants of the Company.

  

The Company represents and warrants to, and agrees with, Subscriber that:

 
 3.1.         Valid Issuance of Capital Stock. The total number of shares of all classes of capital stock which the Company has
authority to issue is 100,000,000 shares of Common Stock and 1,000,000 shares of preferred stock, $0.0001 par value per share (“Preferred Stock”). As of the date hereof, the Company has issued and outstanding 5,750,000 shares of
Common Stock (of which up to 750,000 shares are subject to forfeiture as described in the Registration Statement) and no shares of Preferred Stock. All of the issued shares of capital stock of the Company have been duly authorized, validly issued,
and are fully paid and non-assessable.
  

3.2.         Title
to Securities. Upon issuance in accordance with, and payment pursuant to, the terms hereof and that certain warrant agreement (the “Warrant Agreement”) to be entered into between the Company and Continental, as warrant agent, as
the case may be, each of the Private Units, Private Shares, Private Warrants and Warrant Shares will be duly and validly issued, fully paid and non-assessable. On the date of issuance of the Private Units and Warrant Shares shall have been reserved
for issuance. Upon issuance in accordance with, and payment pursuant to, the terms hereof and the Warrant Agreement, as the case may be, Subscriber will have or receive good title to the Private Units, Private Shares and Private Warrants purchased
by such Subscriber under this Agreement, free and clear of all liens, claims and encumbrances of any kind, other than (i) transfer restrictions hereunder and (ii) transfer restrictions under federal and state securities laws.

 
 3.3.         Organization and Qualification. The Company is a corporation duly incorporated, validly existing and in good standing
under the laws of the State of Delaware and has the requisite corporate power to own its properties and assets and to carry on its business as now being conducted.

 
 3.4.          Authorization; Enforcement. (i) The Company has the requisite corporate power and authority to enter into and
perform its obligations under this Agreement and to issue the
  
 

 
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Securities in accordance with the terms hereof, (ii) the execution, delivery and performance of this Agreement by the Company and the consummation by it of the
transactions contemplated hereby have been duly authorized by all necessary corporate action, and no further consent or authorization of the Company or its Board of Directors or stockholders is required, and (iii) this Agreement constitutes
valid and binding obligations of the Company enforceable against the Company in accordance with its terms, except as such enforceability may be limited by applicable bankruptcy, insolvency, fraudulent conveyance, moratorium, reorganization, or
similar laws relating to, or affecting generally the enforcement of, creditors’ rights and remedies or by equitable principles of general application and except as enforcement of rights to indemnity and contribution may be limited by federal
and state securities laws or principles of public policy.
  

3.5.         No
Conflicts. The execution, delivery and performance of this Agreement and the consummation by the Company of the transactions contemplated hereby do not (i) result in a violation of the Company’s certificate of incorporation or by-laws,
(ii) conflict with, or constitute a default under any agreement or instrument to which the Company is a party or (iii) any law statute, rule or regulation to which the Company is subject or any agreement, order, judgment or decree to which
the Company is subject. Other than any SEC or state securities filings which may be required to be made by the Company subsequent to the Closing, and any registration statement which may be filed pursuant thereto, the Company is not required under
federal, state or local law, rule or regulation to obtain any consent, authorization or order of, or make any filing or registration with, any court or governmental agency or self-regulatory entity in order for it to perform any of its obligations
under this Agreement or issue the Private Units, Private Shares, Private Warrants or Warrant Shares in accordance with the terms hereof.

 
 3.6.         Additional Representations and Warranties. The representations and warranties of the Company set forth in the
Underwriting Agreement are hereby incorporated herein and are true and correct with the same force and effect as though expressly made herein as of the date hereof.

 

		4.	Legends.

  

4.1.         
Legend. The Company will issue the Private Units, Private Shares and Private Warrants, and when issued, the Warrant Shares, purchased by Subscriber in the name of such Subscriber. The Securities will bear the following Legend and appropriate
“stop transfer” instructions:
  

“THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES
ACT”), 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 THE SECURITIES ACT OR SUCH
LAWS OR AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT AND SUCH LAWS WHICH, IN THE OPINION OF COUNSEL FOR THIS CORPORATION, IS AVAILABLE.”

 
 

 
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“THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO LOCKUP PURSUANT TO A UNIT PURCHASE AGREEMENT BETWEEN GIGCAPITAL3,
INC. AND THE SUBSCRIBERS NAMED THEREIN AND MAY ONLY BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED DURING THE TERM OF THE LOCKUP PURSUANT TO THE TERMS SET FORTH IN THE UNIT SUBSCRIPTION AGREEMENT.”

 
 4.2.          Subscriber’s Compliance. Nothing in this Section 4 shall affect in any way Subscriber’s obligations
and agreements to comply with all applicable securities laws upon resale of the Securities.
  

4.3.         
Company’s Refusal to Register Transfer of the Securities. The Company shall refuse to register any transfer of the Securities, if in the sole judgment of the Company such purported transfer would not be made (i) pursuant to an
effective registration statement filed under the Securities Act, or pursuant to an available exemption from the registration requirements of the Securities Act and (ii) in compliance herewith.

 
 4.4.          Registration Rights. Subscriber will be entitled to certain registration rights which will be governed by a
registration rights agreement (“Registration Rights Agreement”) to be entered into among Subscriber, the Company and others, on or prior to the effective date of the Registration Statement.

 

		5.	Waiver of Liquidation Distributions.

  

In connection with the Securities purchased pursuant to this Agreement, Subscriber hereby waives any and all right, title, interest or claim of
any kind in or to any distributions of the amounts in the Trust Account with respect to the Securities, whether (i) in connection with the exercise of redemption rights if the Company consummates the Business Combination, (ii) in
connection with any tender offer conducted by the Company prior to a Business Combination, (iii) upon the Company’s redemption of shares of Common Stock sold in the Company’s IPO upon the Company’s failure to timely complete
the Business Combination or (iv) in connection with a stockholder vote to approve an amendment to the Company’s amended and restated certificate of incorporation, (A) to modify the substance or timing of the Company’s
obligation to redeem 100% of the Company’s public shares if the Company does not timely complete the Business Combination or (B) with respect to any other provision relating to stockholders’ rights or pre-Business Combination
activity. In the event any Subscriber purchases shares of Common Stock in the IPO or in the aftermarket, any additional shares so purchased shall be eligible to receive the redemption value of such shares of Common Stock upon the same terms offered
to all other purchasers of Common Stock in the IPO in the event the Company fails to consummate the Business Combination.
  

		6.	Terms of Private Warrants. Each Private Warrant shall have the terms set forth in the Warrant Agreement.

  

		7.	Lock-Up Period.

  

Subscriber acknowledges that the Securities purchased by it pursuant to this Agreement will be subject to restrictions on transfer contained in
that certain letter agreement (the “Insider
  
 

 
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Letter”), dated as of the date hereof, by and among the Company, Subscriber and each of the underwriters named in the Underwriting Agreement, which
Insider Letter shall be substantially in the form filed as an exhibit to the Registration Statement.
  

		8.	Terms of the Private Units and Private Warrants.

  

8.1.          The
Private Units and their component parts are substantially identical to the units to be offered in the IPO except that: (i) the Private Units and component parts are subject to the transfer restrictions described in Section 7 hereof,
(ii) the Private Warrants will be non-redeemable and may be exercisable on a “cashless” basis if held by a Subscriber or its permitted transferees, as further described in the Warrant Agreement, (iii) the Private Warrants may
not be exercised after the five year anniversary of the effective date of the Registration Statement if held by a Subscriber, its designees or affiliates and (iv) the Private Units and component parts are being purchased pursuant to an
exemption from the registration requirements of the Securities Act and will become freely tradable only after the expiration of the lockup described above in clause (i) and they are registered pursuant to the Registration Rights Agreement or an
exemption from registration is available, and the restrictions described above in clause (i) has expired.
  

8.2.         
Subscriber agrees that if the Company seeks stockholder approval of a Business Combination, then in connection with such Business Combination, Subscriber shall (i) vote the Private Shares owned by it in favor of the Business Combination
and (ii) not redeem any Private Shares owned by Subscriber in connection with such stockholder approval.
  

9.           
 Governing Law; Jurisdiction; Waiver of Jury Trial.
  

This Agreement shall be governed by and construed in accordance with the laws of the State of New York for agreements made and to be wholly
performed within such state. The parties hereto hereby waive any right to a jury trial in connection with any litigation pursuant to this Agreement and the transactions contemplated hereby.

 
 10.          Assignment; Entire Agreement; Amendment.

 
 10.1.       Assignment. Neither this Agreement nor any rights hereunder may be assigned by any party to any other person other than by Subscriber to
a person agreeing to be bound by the terms hereof and the transfer restrictions applicable to Subscriber set forth in the Insider Letter.

 
 10.2.       Entire Agreement. This Agreement sets forth the entire agreement and understanding between the parties as to the subject matter thereof
and merges and supersedes all prior discussions, agreements and understandings of any and every nature among them.
  

10.3.       Amendment. Except as
expressly provided in this Agreement, neither this Agreement nor any term hereof may be amended, waived, discharged or terminated other than by a written instrument signed by all of the parties hereto.

 
 
 

 
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10.4.       Binding upon
Successors. This Agreement shall be binding upon and inure to the benefit of the parties hereto and to their respective heirs, legal representatives, successors and permitted assigns.

 
 11.          Notices.

 
 11.1.       Notices. Unless otherwise provided herein, any notice or other communication to a party hereunder shall be sufficiently given if in
writing and personally delivered or sent by facsimile or other electronic transmission with copy sent in another manner herein provided or sent by courier (which for all purposes of this Agreement shall include Federal Express or other recognized
overnight courier) or mailed to said party by certified mail, return receipt requested, at its address provided for herein or such other address as either may designate for itself in such notice to the other. Communications shall be deemed to have
been received when delivered personally, on the scheduled arrival date when sent by next day or 2nd-day courier service, or if sent by facsimile upon receipt of confirmation of transmittal or, if sent by mail, then three days after deposit in the
mail. If given by electronic transmission, such notice shall be deemed to be delivered (i) if by electronic mail, when directed to an electronic mail address at which the stockholder has consented to receive notice; (ii) if by a posting on
an electronic network together with separate notice to the stockholder of such specific posting, upon the later of (1) such posting and (2) the giving of such separate notice; and (iii) if by any other form of electronic transmission,
when directed to the stockholder.
  
 12.          Counterparts; Electronic Signatures.

 
 This Agreement may be executed in
counterparts, each of which when so executed shall be deemed to be an original and all of which when taken together shall constitute one and the same instrument. The words “execution,” signed,” “signature,” and words of
like import in this Agreement or in any other certificate, agreement or document related to this Agreement shall include images of manually executed signatures transmitted by facsimile or other electronic format (including, without limitation,
“pdf”, “tif” or “jpg”) and other electronic signatures (including, without limitation, DocuSign and AdobeSign). The use of electronic signatures and electronic records (including, without limitation, any contract
or other record created, generated, sent, communicated, received, or stored by electronic means) shall be of the same legal effect, validity and enforceability as a manually executed signature or use of a paper-based record-keeping system to the
fullest extent permitted by applicable law, including the Federal Electronic Signatures in Global and National Commerce Act, the New York State Electronic Signatures and Records Act and any other applicable law, including, without limitation, any
state law based on the Uniform Electronic Transactions Act or the Uniform Commercial Code.
  

13.          
Survival; Severability.
  

13.1.       Survival. The
representations, warranties, covenants and agreements of the parties hereto shall survive each Closing Date.
  

13.2.       Severability. In the
event that any provision of this Agreement becomes or is declared by a court of competent jurisdiction to be illegal, unenforceable or void, this Agreement shall continue in full force and effect without said provision; provided that no such
severability shall be effective if it materially changes the economic benefit of this Agreement to any party.
  

14.          
Headings.
  
 The
titles and subtitles used in this Agreement are used for convenience only and are not to be considered in construing or interpreting this Agreement.

 
 
 

 
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IN WITNESS WHEREOF, the parties hereto have executed this Agreement to be effective as of the date first set forth above.

 
  

	 	COMPANY:
	 	 	 
	 	GIGCAPITAL3, INC.
	 	 	 
	 	By: 	 
	 	Name:
	 	Title:
	 	 	 
	 	SUBSCRIBER:
	 	 	 
	 	GIGACQUISITIONS, LLC
	 	 	 
	 	By:	 
	 	Name:
	 	Title:

 

 
 [Signature Page to Unit Purchase Agreement]

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