Document:

EX-10.1

 Exhibit 10.1 

[DATE], 2021             

GigCapital4, Inc. 
 1731 Embarcadero Rd., Suite 200 

Palo Alto, CA 94303 
 Re: Initial Public
Offering 
 Ladies and Gentlemen: 
 This
letter agreement (this “Letter Agreement”) is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered into by and between GigCapital4, Inc., a
Delaware corporation (the “Company”), and Oppenheimer & Co. Inc. and Nomura Securities International, Inc., as representatives (the “Representatives”) of the several underwriters named therein
(the “Underwriters”), relating to an underwritten initial public offering (the “IPO”) of 26,000,000 units (the “Initial Units”) of the Company, and up to an additional 3,900,000
units (together with the Initial Units, the “Units”) in the event that the Underwriters’ 45-day over-allotment option (“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-third 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 13 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 Underwriters and GigAcquisitions4, LLC, a Delaware limited liability company (“Sponsor”), hereby agrees with the Company 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 24 months of the closing of the IPO, or
(ii) alter its provisions relating to the Company’s pre-Business Combination activity or the related stockholders’ rights prior to the consummation of such Business Combination,
unless, in each case, the Company provides the holders of any Offering Shares with the opportunity to redeem their Offering Shares upon the approval of any such amendment. Such redemption must be
at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account including interest (which interest shall be net of franchise and income taxes
payable by the Company), divided by the number of then outstanding Offering Shares; and 
 (c) the undersigned will not redeem any shares of
Common Stock beneficially owned by him, her 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. 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 24 months of the completion of the IPO. 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. 

3. In order to minimize potential conflicts of interest that may arise from multiple corporate affiliations, 

(a) Sponsor, an Affiliate of Dr. Katz, the Company’s Executive Chairman, shall present to the Company for its consideration, prior to
presentation to any other entity, any target business in the technology, media and telecommunications industry that has a fair market value of at least 80% of the assets held in the Trust Account (excluding the deferred underwriting commissions and
any taxes payable on interest earned), subject to any pre-existing fiduciary or contractual obligations Sponsor might have; and 

(b) Sponsor 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. 
 4. 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, the Sponsor’s management company, and its Affiliates may receive compensation for
administrative services and office space, as provided for under that certain Administrative Services Agreement, dated as of February    , 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
December 24, 2020, issued by the Company in favor of Sponsor; 
 (c) Sponsor 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
Sponsor or its 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; and 

(d) any underwriting discounts, commissions and other fees and compensation payable to the Underwriters pursuant to the Underwriting Agreement,
including, but not limited to, any deferred fees or fee or expense reimbursements set forth therein. 

 5. To the extent that the Underwriters do not exercise the Over-Allotment Option, in full or
in part, within the time period set forth in the Underwriting Agreement, Sponsor agrees that it shall forfeit, at no cost, up to 975,000 Founder Shares. If applicable, Sponsor would forfeit such number of Founder Shares as would be required to
maintain the ownership of the Company’s pre-IPO stockholders at 20.0% of the total issued and outstanding shares of Common Stock immediately after the closing of the
IPO; provided, that the “total issued and outstanding shares of Common Stock” would not take into account any Insider Shares (as defined in the Underwriting Agreement) or shares of Common Stock included in the Private
Units. Sponsor further agrees that to the extent that the size of the IPO is increased or decreased, the Company will purchase or sell shares of Common Stock or effect a stock dividend or share contribution back to capital, as applicable,
immediately prior to the consummation of the IPO in such amounts as to maintain the ownership of the stockholders prior to the IPO at 20.0% of its total issued and outstanding shares of Common Stock upon the consummation of the
IPO; provided, that the “total issued and outstanding shares of Common Stock” would not take into account any Insider Shares (as defined in the Underwriting Agreement) or shares of Common Stock included the Private
Units. 
 6. Sponsor agrees to continue to serve as the Sponsor of the Company until the earlier of the consummation by the Company of a
Business Combination or its liquidation. 
 7. Sponsor’s FINRA Questionnaire previously furnished to the Company and the Representatives
is true and accurate in all respects. 
 8. Each of the undersigned represents and warrants that (i) 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) 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) 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. 
 9. Each of undersigned agrees that it shall not Transfer any Founder
Shares, Private Units or any securities underlying the Private Units beneficially held by it, or by its Affiliates until the date that is (i) in the case of the Founder Shares, the earlier of (A) twelve months after the completion of a
Business Combination or (B) the date on which, subsequent to a Business Combination, (x) the last sale price of the Common Stock equals or exceeds $12.50 per share (as adjusted for stock splits, stock dividends, reorganizations,
recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 90 days after a Business Combination or (y) the Company completes a
liquidation, merger, stock exchange or other similar transaction that results in all of the Company’s stockholders having the right to exchange their shares of Common Stock for cash, securities or other property and (ii) in the case of the
Private Units or any securities underlying the Private Units, until 30 days after the completion of a Business Combination (the “Lock-up Period”).
Notwithstanding the foregoing, during the Lock-up Period, Transfers of Founder Shares, Private Units or any securities underlying the Private Units beneficially held by the undersigned 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. 

 10. In the event of the liquidation of the Trust Account, Sponsor (the
“Indemnitor”) agrees to indemnify and hold harmless the Company against any and all loss, liability, claim, damage and expense whatsoever (including, but not limited to, any and all legal or other expenses reasonably incurred
in investigating, preparing or defending against any litigation, whether pending or threatened, or any claim whatsoever) to which the Company may become subject as a result of any claim by (i) any third party for services rendered or products
sold to the Company, or (ii) a prospective target business with which the Company has entered into an acquisition agreement; provided, however, that such indemnification of the Company by the Indemnitor
shall apply only to the extent necessary to ensure that such claims by a third party for services rendered (other than the Company’s independent public accountants) or products sold to the Company or a target do not reduce the amount of funds
in the Trust Account to below the lesser of (i) $10.00 per share of the Offering Shares, or (ii) such lesser amount per share of the Offering Shares held in the Trust Account due to reductions in the value of the trust assets as of
the date of the liquidation of the Trust Account, in each case, net of the amount of interest earned on the property in the Trust Account which may be withdrawn to pay taxes, except as to any claims by a third party who executed a waiver of any and
all rights to seek access to the Trust Account (whether or not such agreement is enforceable) and as to any claims under the Company’s indemnity of the Underwriters against certain liabilities, including liabilities under the Securities Act. In
the event that any such executed waiver is deemed to be unenforceable against such third party, the Indemnitor shall not be responsible for any liability as a result of any such third party claims. The Indemnitor shall have the right to defend
against any such claim with counsel of its choice reasonably satisfactory to the Company if, within fifteen (15) days following written receipt of notice of the claim to the Indemnitor, the Indemnitor notifies the Company in writing that it
shall undertake such defense. 
 11. The undersigned has full right and power, without violating any agreement by which he, she, or it is
bound, to enter into this Letter Agreement. 
 12. 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) with respect
to Sponsor only, 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 own behalf, service of process in any Proceedings. If for any
reason such agent is unable to act as such with respect to Sponsor, Sponsor will promptly notify the Company and the Representatives 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. 
 13. 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) “Founder Shares” means the 7,460,000 shares of Common Stock (of which
975,000 are subject to forfeiture pursuant to paragraph 5) purchased by Sponsor pursuant to a subscription agreement, dated as of December 21, 2020, entered into by and between Sponsor and the Company; (vi) “Insiders”
means all executive officers and directors of the Company immediately prior to the IPO, as well as Sponsor and any of its Affiliates; (vii) “Private Units” means the 930,000 private units (or 999,500 private units if the
Over-Allotment Option is exercised in full) of the Company, each consisting of one share of Common Stock and one-third of one warrant to purchase a share of Common Stock at a price of $11.50 per share, to be purchased by the Sponsor and the
Underwriters in private placements intended to close simultaneously with the consummation of the IPO and the Over-Allotment Option, as applicable, (viii) the “Registration Statement” shall mean the Registration Statement
on Form S-1 (Registration No. 333-252315) filed by the Company with the SEC in connection with the IPO, as the same may be amended or
supplemented; (ix) the “Securities Act” means the Securities Act of 1933, as amended; (x) the “SEC” means the United States Securities and Exchange Commission;
(xi) “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 (xii) “Trust Account” means the trust account into which a
portion of the net proceeds of the Company’s IPO will be deposited. 

 14. 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. 

15. 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. 
 16. 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. 

17. 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,
	
	GIGACQUISITIONS4, LLC
	
	  

	By: Dr. Avi S. Katz, Manager
	
	OPPENHEIMER & CO. INC.
	
	  

	By:
	
	NOMURA SECURITIES INTERNATIONAL, INC.
	
	  

	By:

  

	
	Accepted and agreed this [●] day of [●], 2021.
	
	GIGCAPITAL4, INC.
	
	  

	 By: Dr. Raluca Dinu,
 Chief Executive
Officer and President

 Signature page to Insider Letter (Sponsor and Underwriters)EX-10.2

 Exhibit 10.2 

[DATE], 2021 
 GigCapital4, Inc. 

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

Oppenheimer & Co. Inc. 
 85 Broad Street 

New York, New York 10004 
 Nomura Securities International, Inc.

 Worldwide Plaza 
 309 West 49th Street 

New York, New York 
 10019-7316 

Re: Initial Public Offering 
 Ladies
and Gentlemen: 
 This letter agreement (this “Letter Agreement”) is being delivered to you in accordance with the
Underwriting Agreement (the “Underwriting Agreement”) entered into by and between GigCapital4, Inc., a Delaware corporation (the “Company”), and Oppenheimer & Co. Inc. and Nomura Securities
International, Inc., as representatives (the “Representatives”) of the several underwriters named therein (the “Underwriters”), relating to an underwritten initial public offering (the
“IPO”) of 26,000,000 units (the “Initial Units”) of the Company, and up to an additional 3,900,000 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-third of one redeemable warrant to purchase one share of Common Stock at a price of
$11.50 per share, subject to adjustment (the warrants included in the Units sold, the “Offering Warrants”). Capitalized terms used herein but not defined in context are defined in paragraph 12 hereof. 

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

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

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

(b) the undersigned hereby agrees not to propose for a stockholder approval any amendment to the Amended and Restated Certificate of
Incorporation that would (i) affect the substance or timing of the Company’s obligation to redeem 100% of the Offering Shares if the Company does not complete a Business Combination within 24 months of the closing of the IPO letter,

 
or (ii) alter its provisions relating to the Company’s pre-Business Combination activity or the related stockholders’ rights
prior to the consummation of such Business Combination, unless, in each case, the Company provides the holders of any Offering Shares with the opportunity to redeem their Offering Shares upon the approval of any such amendment. Such redemption must
be at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account including interest (which interest shall be net of franchise and income taxes
payable by the Company), divided by the number of then outstanding Offering Shares; and 
 (c) the undersigned will not redeem any shares of
Common Stock beneficially owned by him/her in connection with a solicitation for stockholder approval described in either of clauses (a) or (b) above, or sell any such shares of Common Stock in a tender offer undertaken by the Company in
connection with a Business Combination. 
 2. If the Company fails to consummate a Business Combination within 24 months of the
completion of the IPO, or such other time period as may be set forth in the Amended and Restated Certificate of Incorporation, the undersigned will cause the Company to (i) cease all operations except for the purpose of winding up, (ii) as
promptly as reasonably possible, but not more than 10 business days thereafter, redeem the Offering Shares at a per-share price, payable in cash, equal to the aggregate amount then on
deposit in the Trust Account, including interest earned on the Trust Account (which interest shall be net of taxes payable by the Company and up to $100,000 of interest to pay dissolution expenses), divided by the number of then outstanding Offering
Shares, which redemption will completely extinguish the holders’ rights as stockholders (including the right to receive further liquidation distributions, if any), and (iii) as promptly as reasonably possible following such redemption,
subject to the approval of the Company’s remaining stockholders and the Company’s board of directors, dissolve and liquidate, subject in the cases of clauses (ii) and (iii) to the Company’s obligations under Delaware law to
provide for claims of creditors and other requirements of applicable law. 
 3. The undersigned hereby waives any and all right, title,
interest or claim of any kind the undersigned may have in the future in or to any distribution of the Trust Account and any remaining assets of the Company as a result of, or arising out of, any contracts or agreements with the Company and will not
seek recourse against the Trust Account for any reason whatsoever; provided, that the foregoing waiver shall not apply with respect to liquidating distributions from the Trust Account made in connection with any Offering
Shares purchased by the undersigned or its Affiliates during the IPO or on the open market after the completion of the IPO if the Company fails to complete a Business Combination within 24 months of the completion of the IPO. The undersigned
acknowledges and agrees that there will be no distribution from the Trust Account with respect to any of the Offering Warrants, all rights of which will terminate upon the Company’s liquidation. 

4. In order to minimize potential conflicts of interest that may arise from multiple corporate affiliations, 

(a) the undersigned shall present to the Company for its consideration, prior to presentation to any other entity, any target business in the
technology, media and telecommunications industry that has a fair market value of at least 80% of the assets held in the Trust Account (excluding the deferred underwriting commissions and any taxes payable on interest earned), subject to any pre-existing fiduciary or contractual obligations the undersigned might have; and 

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

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

(a) 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 February [•], 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
December 24, 2021, issued by the Company in favor of Sponsor; 
 (c) Mr. Weightman may receive compensation for his services as
Chief Financial Officer of the Company, as provided for under that certain Strategic Services Agreement and Confidential Information and Invention Assignment Agreement with the Company dated as of February 1, 2021; 

(d) Mr. Weightman may receive 5,000 shares of Common Stock and Ms. Hayes may receive 10,000 shares of Common Stock (the
“Insider Shares”) as consideration for the future services as Chief Financial Officer and our director, respectively; and 

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

6. The undersigned agrees to continue to serve in his or her current capacity as an executive officer and/or director of the Company until the
earlier of the consummation by the Company of a Business Combination or its liquidation. The biographical information of the undersigned previously furnished to the Company and the Representatives is true and accurate in all respects, does not omit
any material information with respect to the undersigned’s background and contains all of the information required to be disclosed pursuant to Item 401
of Regulation S-K, promulgated under the Securities Act. The undersigned’s FINRA Questionnaire previously furnished to the Company and the Representative is also true and accurate in
all respects. 
 7. The undersigned represents and warrants that (i) he or she is not subject to, or a respondent in, any legal action
for any injunction, cease-and-desist order, or order or stipulation to desist or refrain from any act or practice relating to the offering of
securities in any jurisdiction; (ii) he or she has never been convicted of or pleaded guilty to any crime involving any fraud, relating to any financial transaction or handling of funds of another person, or pertaining to any dealings in any
securities and he or she is not currently a defendant in any such criminal proceeding; and (iii) he or she has never been suspended or expelled from membership in any securities or commodities exchange or association, or had a securities or
commodities license or registration denied, suspended or revoked. 
 8. The undersigned agrees that he or she shall not Transfer (as defined
below) any Insider Shares of the Company held by him or her or by his or her Affiliates until the earlier of (i) twelve months after the completion of a Business Combination or (ii) the date on which, subsequent to a Business Combination,
(x) the last sale price of the Common Stock equals or exceeds $12.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like) for any 20 trading days
within any 30-trading day period commencing at least 90 days after a Business Combination, or (y) the Company completes a liquidation, merger, stock exchange or other similar

 
transaction that results in all of the Company’s stockholders having the right to exchange their shares of Common Stock for cash, securities or other property (the “Lock-up Period”). Notwithstanding the foregoing, during the Lock-up Period, Transfers of Insider Shares are
permitted to be made (a) amongst Sponsor and its Affiliates, to the Company’s executive officers or directors, or to any Affiliate or family member of any of the Company’s executive officers or directors; (b) in the case of an
entity, as a distribution to its partners, stockholders or members upon its liquidation; (c) in the case of an individual, (1) by bona fide gift to such person’s immediate family or to a trust, the beneficiary of which is a member of
such person’s immediate family, an Affiliate of such person or to a charitable organization, (2) by virtue of the laws of descent and distribution upon death of such person, (3) pursuant to a qualified domestic relations order;
(d) by certain pledges to secure obligations incurred in connection with purchases of the Company’s securities; (e) through private sales or transfers made in connection with the consummation of a Business Combination at prices no
greater than the price at which such securities were originally purchased; (f) in the case of an Underwriter, to such Underwriter’s Affiliates or any entity controlled by such Underwriter; or (g) to the Company for no value for
cancellation in connection with the consummation of a Business Combination; provided, that, in each such case (except clause (g)), these permitted transferees must enter into a written agreement agreeing to be bound by these
transfer restrictions and the other terms described in this Letter Agreement to the extent and for the duration that such terms remain in effect at the time of the Transfer. 

9. Notwithstanding the foregoing paragraph 8, each of the undersigned agrees that during the period commencing on the effective date of the
Underwriting Agreement and ending 180 days after such date, none of them nor any of their Affiliates, may, without the prior written approval of the Underwriters, offer, sell, contract to sell, pledge, or otherwise dispose of, directly or
indirectly, or hedge the Company’s Units, warrants, shares of Common Stock or any other securities convertible into or exchangeable or exercisable for shares of Common Stock. The foregoing sentence shall not apply to the registration of the
offer and sale of Units contemplated by the Underwriting Agreement and the sale of the Units to the Underwriters. 
 10. The undersigned has
full right and power, without violating any agreement by which he or she is bound, to enter into this Letter Agreement and to serve as an executive officer and/or director of the Company. 

11. This Letter Agreement shall be governed by and construed and enforced in accordance with the laws of the State of New York, without giving
effect to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction. The undersigned hereby (i) agrees that any action, proceeding or claim against him or her arising out of or relating in
any way to this Letter Agreement (a “Proceeding”) shall be brought and enforced in the courts of the State of New York of the United States of America for the Southern District of New York, and irrevocably submits to such
jurisdiction, which jurisdiction shall be exclusive, (ii) waives any objection to such exclusive jurisdiction and that such courts represent an inconvenient forum, and (iii) irrevocably agrees to appoint 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 or her behalf, service of process in any Proceeding. If for any reason such agent is unable to act as such, the undersigned will promptly notify the Company and
the Representative and appoint a substitute agent acceptable to each of the Company and the Representative within 30 days and nothing in this Letter Agreement will affect the right of either party to serve process in any other manner permitted by
law. 
 12. As used herein, (i) “Affiliate” has the meaning set forth in Rule 144(a)(1) under the Securities Act;
(ii) “Amended and Restated Certificate of Incorporation” refers to the Amended and Restated Certificate of Incorporation of the Company, as filed with the Secretary of State of the State of Delaware, as the same may be
amended from time to time; (iii) a “Business Combination” shall mean a merger, share exchange, asset acquisition, stock purchase, recapitalization, reorganization or other similar business combination with one or more
businesses or entities; (iv) “Exchange Act” means the Securities Exchange Act of 1934, as amended; (v) “Insiders” means all executive officers and directors of the Company immediately prior to the IPO,
as well as Sponsor and any of its Affiliates; (vi) the “Registration Statement” shall mean the Registration Statement on Form S-1 (Registration No. 333-252315) 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,
 President, Chief Executive
Officer,
 Secretary, and Director of GigCapital4, Inc.

	
	  

	Dr. Avi S. Katz
	Executive Chairman of the Board of GigCapital4, Inc.
	
	  

	Brad Weightman Chief Financial Officer of GigCapital4, Inc.
	
	  

	Neil Miotto, Director of GigCapital4, Inc.
	
	  

	Andrea Betti-Berutto, Director of GigCapital4, Inc.
	
	  

	Dorothy D. Hayes, Director of GigCapital4, Inc.

  

	
	Accepted and agreed this [DAY]th day of [MONTH], 2021.
	
	GIGCAPITAL4, INC.
	
	  

	 Dr. Raluca Dinu
 Chief Executive Officer
and President

  

	
	
	OPPENHEIMER & CO. INC.
	
	  

	 By:
 Title:

	
	 NOMURA SECURITIES
 INTERNATIONAL,
INC.

	
	  

	 By:
 Title:

 Signature page to Insider Letter (Executive Officers and Directors)

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