Document:

EX-10.2

 Exhibit 10.2 

[DATE], 2021 
 GigInternational1, Inc. 

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

Oppenheimer & Co. Inc. 
 85 Broad Street 

New York, New York 10004 
 William Blair & Company,
L.L.C. 
 150 North Riverside Plaza 
 Chicago, IL 60606 

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 among GigInternational1, Inc., a Delaware corporation (the “Company”), and Oppenheimer & Co. Inc. and William
Blair & Company, L.L.C., 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, and Interest Solutions, LLC, a Connecticut limited liability company and an affiliate of ICR, LLC, an investor relations firm
providing services to the Company (collectively with Interest Solutions, LLC, “ICR”), 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 or it 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
15 months of the closing of the IPO letter, provided that the Company may, but is not obligated to, extend the period of time to consummate its initial Business Combination two times by an additional three months each time (for a total of up to
21 months to complete its initial Business Combination), subject to satisfaction of conditions set forth in the Registration Statement, 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 or it 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 15 months of the completion of the IPO, provided that the Company may,
but is not obligated to, extend the period of time to consummate its initial Business Combination two times by an additional three months each time (for a total of up to 21 months to complete its initial Business Combination), subject to
satisfaction of conditions set forth in the Registration Statement, 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. Each of 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
15 months of the completion of the IPO, provided that the Company may, but is not obligated to, extend the period of time to consummate its initial Business Combination two times by an additional three months each time (for a total of up to 21
months to complete its initial Business Combination), subject to satisfaction of conditions set forth in the Registration Statement. Each of 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 (other than ICR) shall present to
the Company for its consideration, prior to presentation to any other entity, any target business in the technology, media and telecommunications, aerospace and defense, mobility and semiconductor industries located in Europe, the Middle East and
Africa 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) GigManagement, LLC, a Delaware limited liability company (“Sponsor”), an Affiliate of Drs. Katz and Dinu, and its
Affiliates may receive compensation for administrative services and office space, as provided for under that certain Administrative Services Agreement, dated as
of                    , 2021, between the Company and GigManagement, LLC; 

 (b) Sponsor may receive amounts due under that certain promissory note in the aggregate
principal amount of $125,000, dated as of March 3, 2021, issued by the Company in favor of Sponsor; 
 (c) Mr. Weightman may
receive compensation for his services as the 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        , 2021; 
 (d) Mr. Weightman may receive 5,000 shares of Common Stock and ICR may
receive 10,000 shares of Common Stock (the “Insider Shares”) as consideration for the future services as the Chief Financial Officer and our investor relations firm, 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. Each of the undersigned individuals 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 individuals 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. Each of the undersigned represents and warrants that (i) he, she or it 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, she or it 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, she or it is not currently a defendant in any such criminal proceeding; and (iii) he, she or it 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. Each of the undersigned agrees that he, she or it shall not Transfer
(as defined below) any Insider Shares of the Company held by him, her, it or by their Affiliates until the earlier of (i) six 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 $11.50 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 (if applicable). 
 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, her or it 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 DLA Piper LLP (US) as agent for the service of process in the State of New York to receive, for the undersigned and on his, her or its 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, and ICR; (vi) the “Registration Statement” shall
mean the Registration Statement on Form S-1 (Registration No. 333-255234) 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 Raluca Dinu,
 Chief Executive Officer,
President, Secretary,
 and Director of GigInternational1, Inc.

	
	  

	 Dr. Avi S. Katz, Executive Chairman of the

Board of Directors of GigInternational1, Inc.

	
	  

	Dorothy D. Hayes, Director of GigInternational1, Inc.
	
	  

	Andrea Betti-Berutto, Director of GigInternational1, Inc.
	
	  

	Raanan Horowitz, Director of GigInternational1, Inc.
	
	  

	Peter Wang, Director of GigInternational1, Inc.
	
	  

	Brad Weightman, Chief Financial Officer of GigInternational1, Inc.
	
	INTEREST SOLUTIONS, LLC
	
	  

	 By:
 Title:

 Signature page to Insider Letter (Executive Officers and Directors) 

	
	 Accepted and agreed this [DAY]th day of

[MONTH], 2021.

	
	GIGINTERNATIONAL1, INC.
	
	  

	 Dr. Raluca Dinu
 Chief Executive Officer,
President and
 Secretary

	
	OPPENHEIMER & CO. INC.
	
	  

	 By:
 Title:

	
	WILLIAM BLAIR & COMPANY, L.L.C.
	
	  

	 By:
 Title:

 Signature page to Insider Letter (Executive Officers and Directors)EX-10.5

 Exhibit 10.5 

UNIT PURCHASE AGREEMENT 

This UNIT PURCHASE AGREEMENT (this “Agreement”) is made as of the [•] day
of                 , 2021, by and among GigInternational1, Inc., a Delaware corporation (the “Company”), and GigInternational1 Sponsor, 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 “Private Units”) of the Company 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 Private Units at the 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 Closing Date (as defined below) the Private Units in consideration of the payment of the Purchase Price. On the 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)	 [Reserved]. 

1.2. Purchase Price. 
  

	 	(a)	 As payment in full for the Private Units being purchased under this Agreement, Subscriber shall pay $6,500,000
(the “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 Closing Date. 

 

	 	(b)	 [Reserved]. 

1.3. Closing. The closing of the purchase and sale of the Private Units shall take place simultaneously with the closing of the IPO (the
“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
Oppenheimer & Co. Inc. 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 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
GIGINTERNATIONAL1, 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 the 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:
	
	GIGINTERNATIONAL1, INC.

 
			
		
	By:	 	  

 
			
	Name: Dr. Raluca Dinu
	Title:   Chief Executive Officer, President and Secretary
	
	SUBSCRIBER:
	
	GIGINTERNATIONAL1 SPONSOR, LLC

 
			
		
	By:	 	  

 
			
	Name: Dr. Avi S. Katz
	Title:   Manager

 [Signature Page to Sponsor Unit Purchase Agreement]

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