Document:

EX-10.4

 Exhibit 10.4 

GigCapital5, Inc. 
 1731
Embarcadero Road 
 Suite 200 

Palo Alto, CA 94303 

September 23, 2021 

RE: Grant of Insider Shares 
 Dear
Sirs: 
 We are pleased that your affiliate, ICR, LLC (“ICR”), has agreed to serve as our investor relations firm providing
services to GigInternational1, Inc., a Delaware corporation (the “Company”). In exchange for the future services of ICR as an investor relations firm to the Company and at the request of ICR, you (“you,” and references to
the services of your affiliate ICR, “your future services”) are hereby granted 10,000 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 our investor relations firm providing services to 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. Your Representations, Warranties and Agreements. To induce the Company to issue the Insider Shares to you, you hereby
represent and warrant to the Company and agree with the Company as follows: 
 2.1.1. No Government Recommendation or
Approval. You understand 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 you of the transactions
contemplated hereby do not violate, conflict with or constitute a default under (i) any agreement, indenture or instrument to which you are a party, (ii) any law, statute, rule or regulation to which you are subject, or (iii) any
agreement, order, judgment or decree to which you are subject. 
 2.1.3. Organization and Authority. You possess all
requisite power and authority necessary to carry out the transactions contemplated by this Agreement. Upon execution and delivery by you, this Agreement will be a legal, valid and binding agreement of you, enforceable against you 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. You are: (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. You are capable of evaluating the merits and risks of such acquisition of the Insider Shares and have the capacity to protect your own interests. You 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. You are able to bear the economic
risks and to afford a complete loss of your investment in the Insider Shares. 
 2.1.5. Access to Information; Independent
Investigation. Prior to the execution of this Agreement, you have 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. You have relied solely on your own knowledge and understanding of the Company and its business based upon your own due

 
diligence investigation and the information furnished pursuant to this paragraph. You understand 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 you have not relied on any other representations or information in making your investment decision, whether written or oral, relating to the Company, its operations or its prospects.

 2.1.6. Restrictions on Transfer; Shell Company. You understand the Insider Shares are being offered in a transaction
not involving a public offering within the meaning of the Securities Act. You understand the Insider Shares will be “restricted securities” as defined in Rule 144(a)(3) under the Securities Act and you understand that the certificate
representing the Insider Shares will contain a legend in respect of such restrictions. If in the future you decide 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. You agree 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, you may be required to deliver to the Company an opinion of counsel satisfactory to the Company. Absent registration or an exemption, you agree not to resell the Insider Shares. You further acknowledge that because
the Company is a shell company, Rule 144 may not be available to you 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, you hereby waive 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 you purchase 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 you 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, you 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, you 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. You agree 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. 

4.2. Lock-ups. You acknowledge 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. You acknowledge 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. [Reserved.] 

6. Voting and Redemption of Insider Shares. You agree 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. [Reserved.] 

8. Tax Consequences. You should obtain advice from an appropriate independent professional adviser with respect to, and
under the laws of your 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”). You 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, you hereby agree 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 your country of citizenship and/or residence to the extent
arising from a Trigger Event. 
 10. Other Agreements. 

10.1. Further Assurances. You agree 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 you 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. 
 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 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 you 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] 

 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,
	
	GIGCAPITAL5, INC.
	
	     /s/ Raluca Dinu

	 Dr. Raluca Dinu, Chief Executive Officer,

President and Secretary

 Accepted and agreed this 23rd day of September, 2021. 

 

			
	INTEREST SOLUTIONS, LLC
	
	     /s/ John Sorensen

	By:	 	John Sorensen
	Title:	 	Chief Operating Officer

  
 [Signature Page to
Shares Grant Agreement - ICR]EX-10.5

 Exhibit 10.5 

UNIT PURCHASE AGREEMENT 

This UNIT PURCHASE AGREEMENT (this “Agreement”) is made as of the 23rd day of September, 2021, by and among GigCapital5,
Inc., a Delaware corporation (the “Company”), and GigAcquisitions5, LLC (“Subscriber”). 
 WHEREAS, the
Company desires to sell to Subscriber on a private placement basis (the “Sale”) an aggregate of 750,000 private units (the “Initial Private Units”) of the Company, and up to an additional 45,000 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 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
$7,500,000 (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 DLA Piper LLP (US), 555 Mission Street, Suite 2400, San Francisco, California
94105, 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. 

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, 2021 or if that certain Underwriting Agreement, dated as of the date hereof, by and among the Company and Wells Fargo Securities, LLC and William Blair & Company, L.L.C., 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. 
 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.

 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 10,047,500 shares of Common Stock of which
4,312,500 shares of Common Stock will be surrendered by the Subscriber to the Company for no consideration at the time of the IPO, so that the Subscriber will hold 5,735,000 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 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.” 

“THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO LOCKUP PURSUANT TO A UNIT PURCHASE AGREEMENT BETWEEN
GIGCAPITAL5, 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 PURCHASE 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 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. 

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. 

[remainder of page intentionally left blank] 

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

			
	COMPANY:
	
	GIGCAPITAL5, INC.
		
	By:	 	 /s/ Raluca Dinu

	Name:	 	Dr. Raluca Dinu
	Title:	 	Chief Executive Officer and President
	
	SUBSCRIBER:
	
	GIGACQUISITIONS5, LLC
		
	By:	 	 /s/ Avi S. Katz

	Name:	 	Dr. Avi S. Katz
	Title:	 	Manager

 [Signature Page to Unit Purchase Agreement]

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