Document:

EX-10.1

 Exhibit 10.1 

                     
                                         
                                         
         December [•], 2017 
 GigCapital, Inc. 

4 Palo Alto Square, Suite 232 

3000 El Camino Real 
 Palo Alto,
CA 94306 
 Re: Initial Public Offering 

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 GigCapital, Inc., a Delaware corporation (the
“Company”), and Cowen and Company, LLC, as representative (the “Representative”) of the several Underwriters named therein (the “Underwriters”), relating to an underwritten
initial public offering (the “IPO”) of the Company’s units (the “Units”), each 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, “Offering Shares”), one right to receive one-tenth (1/10) of one share of Common Stock (the “Right”)
and one-half ( 1⁄2) of a 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 15 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 entities and individuals, each of whom is a Founder,
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 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 (provided that this clause (ii) shall not apply to Cowen Investments LLC, a
Delaware limited liability company (“Cowen Investments”), or any of its Affiliates); 
 (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 18 months of the closing of the IPO (or 21 months from the closing date of the IPO if the Company has executed a letter of intent, agreement in principle or definitive agreement for an initial
Business Combination within 18 months from the closing date of the IPO but has not completed the initial Business Combination within such 18 month period), or (ii) alter its provisions relating to the Company’s pre-Business Combination activity or the related stockholders’ rights, unless 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 (net of taxes payable), 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 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. 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 18 months of the completion of the IPO (or 21 months from the closing date of the IPO if the Company has executed a letter of intent, agreement in
principle or definitive agreement for an initial Business Combination within 18 months from the closing date of the IPO but has not completed the initial Business Combination within such 18 month period). 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) GigAcquisitions, LLC, a Delaware limited liability company (“Sponsor”), an Affiliate of Dr. Katz, the
Company’s Chief Executive Officer, shall present to the Company for its consideration, prior to presentation to any other entity, any target business that has a fair market value of at least 80% of the assets held in the Trust Account
(excluding taxes payable on interest earned), subject to any pre-existing fiduciary or contractual obligations the undersigned might have; 

(b) the Sponsor and its Affiliates, shall not participate in the formation of, or become an officer or director of, any blank check company
with a class of securities registered under the Exchange Act until the Company has entered into a definitive agreement regarding a Business Combination or the Company has failed to complete a Business Combination within 18 months of the closing of
the IPO (or 21 months from the closing date of the IPO if the Company has executed a letter of intent, agreement in principle or definitive agreement for an initial Business Combination within 18 months from the closing date of the IPO but has not
completed the initial Business Combination within such 18 month period); and 
 (c) 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. 

4. Neither the undersigned nor 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) Sponsor may receive compensation for administrative services and office space, as provided for under that certain Administrative Services
Agreement with the Company dated as of October 11, 2017; 

  
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 (b) Sponsor may receive amounts due under that certain promissory note in the aggregate principal
amount of up to $55,000, dated October 11, 2017, issued by the Company in favor of Sponsor; 
 (c) any of the undersigned 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, 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; and 
 (d) any underwriting discounts, commissions and other
fees and compensation payable to the underwriters of the IPO, including the Representative, who is an Affiliate of each of Cowen Investments, Mr. Silverberg and Mr. Bernstein, and/or their Affiliates. 

5. To the extent that the Underwriters do not exercise their over-allotment option to purchase an additional 2,250,000 Units within the time
period set forth in the Registration Statement (and as further described in the Registration Statement), (i) Sponsor agrees that it shall forfeit, at no cost, up to 455,357 Founder Shares, (ii) Cowen Investments agrees that it shall forfeit, at
no cost, up to 75,000 Founder Shares, (iii) Mr. Silverberg agrees that he shall forfeit, at no cost, up to 28,929 Founder Shares, and (iv) Mr. Bernstein agrees that he shall forfeit, at no cost, up to 3,214 Founder Shares. If
applicable, the Founders would forfeit, on a pro rata basis consistent with the proportion of their ownership of Founder Shares, 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 shares of Common Stock included in units purchased by the Founders in the private placement that such parties intend to consummate simultaneously with the closing of the IPO. The Founders further agree
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 shares of Common Stock included in units purchased by the Founders in the private placement that such parties intend to consummate simultaneously with the closing of the IPO.

 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. The undersigned’s FINRA Questionnaire previously furnished to the Company and the Representative
is true and accurate in all respects. 
 8. The undersigned represents and warrants that (i) he 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 or it has never been convicted of or pleaded guilty to any crime involving any fraud, relating to any financial transaction or 

  
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handling of funds of another person, or pertaining to any dealings in any securities, and he is not currently a defendant in any such criminal proceeding; and (iii) he 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. 

9. The undersigned agrees that he or it shall not Transfer (as defined below) any securities (“Securities”) of the
Company beneficially held by him or by his Affiliates, other than any Units, or the Offering Shares or Offering Warrants underlying such Units, purchased in the IPO or in the open market after the IPO, until the earlier of (i) one year 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 150 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 Securities are permitted to be made (a) to any persons (including
their Affiliates and members) participating in the private placement of the private units (as described in the Registration Statement); (b) among the Founders or to the Company’s executive officers, directors or employees; (c) in the case
of an entity, as a distribution to its partners, stockholders or members upon its liquidation; (d) in the case of an individual, by a bona fide gift to a member of one of the members of the individual’s immediate family or to a trust, the
beneficiary of which is a member of one of the individual’s immediate family, for estate planning purposes; (e) in the case of an individual, by virtue of laws of descent and distribution upon death of the individual; (f) in the case
of an individual, pursuant to a qualified domestic relations order; (g) by pledges to secure obligations incurred in connection with purchases of the Company’s securities; (h) by private sales or transfers made in connection with the
consummation of a Business Combination at prices no greater than the price at which the securities were originally purchased; or (i) to the Company for no value for cancellation in connection with the consummation of a Business
Combination; provided, however, that in any case (other than clause (i)), 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.
Notwithstanding the foregoing paragraph 9, 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
Transfer any Securities beneficially owned by them, other than any Units, or the Offering Shares or Offering Warrants underlying such Units, purchased in the IPO or in the open market after the IPO. 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. 
 11.
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

  
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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. 

12. The undersigned has full right and power, without violating any agreement by which he is bound, to enter into this Letter Agreement. 

13. 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 arising out of or relating in any way
to this Letter Agreement (a “Proceeding”) shall be brought and enforced in the courts of the State of New York of the United States of America for the Southern District of New York, and irrevocably submits to such
jurisdiction, which jurisdiction shall be exclusive, (ii) waives any objection to such exclusive jurisdiction and that such courts represent an inconvenient forum, and (iii) irrevocably agrees to appoint Crowell & Moring LLP as
agent for the service of process in the State of New York to receive, for the undersigned and on his or 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. 
 14. 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” means Sponsor, Cowen Investments, Mr. Irwin Silverberg and
Mr. Jeffrey Bernstein, each of whom hold Founder Shares; (vi) “Founder Shares” means shares of Common Stock purchased by each Founder pursuant to subscription agreements entered into by and between each Founder and the
Company, each dated as of October 11, 2017; (vii) “Insiders” means all executive officers, directors and director nominees of the Company immediately prior to the IPO, as well as the Founders, and any of their
Affiliates; (viii) the “Registration Statement” shall mean the Registration Statement on Form S-1 filed by the Company with the Securities and Exchange Commission in connection
with the IPO, as the same may be amended or supplemented; (ix) “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. 

  
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 15. 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. 

16. 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. 
 17. 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. 
 18. This
Letter Agreement may be executed in one or more counterparts, all of which when taken together shall be considered one and the same agreement and shall become effective when counterparts have been signed by each party and delivered to each other
party, it being understood that the parties need not sign the same counterpart. In the event that any signature is delivered by facsimile transmission or any other form of electronic delivery, such signature shall create a valid and binding
obligation of the party executing (or on whose behalf such signature is executed) with the same force and effect as if such signature page were an original thereof. 

[Signature page to follow] 

  
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	Very truly yours,
	
	GIGACQUISITIONS, LLC
	
	  
 By: Dr. Avi S. Katz,
Manager

	
	COWEN INVESTMENTS LLC
	
	  
 By: Stephen Lasota, Chief Financial
Officer

	
	  
 Irwin Silverberg

	
	  
 Jeffrey Bernstein

  

	
	Accepted and agreed this        day of December, 2017.

	
	
	GIGCAPITAL, INC.

	
	
	  
 By: Dr. Avi S. Katz,
Chairman of the Board
 and Chief Executive Officer

 Signature page to Insider Letter (Founders)EX-10.2

 Exhibit 10.2 

December [•], 2017 
 GigCapital, Inc. 

4 Palo Alto Square, Suite 232 

3000 El Camino Real 
 Palo Alto,
CA 94306 
 Re: Initial Public Offering 

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 GigCapital, Inc., a Delaware corporation (the
“Company”), and Cowen and Company, LLC, as representative (the “Representative”) of the several Underwriters named therein (the “Underwriters”), relating to an underwritten
initial public offering (the “IPO”) of the Company’s units (the “Units”), each 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, “Offering Shares”), one right to receive one-tenth (1/10) of one share of Common Stock (the “Right”)
and one-half ( 1⁄2) of a 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, director or
director nominee of the Company and signing this Letter Agreement in his personal capacity and not on behalf of the Company, 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 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 18 months of the closing of the IPO (or 21 months
from the closing date of the IPO if the Company has executed a letter of intent, agreement in principle or definitive agreement for an initial Business Combination within 18 months from the closing date of the IPO but has not completed the initial
Business Combination within such 18 month period), or (ii) alter its provisions relating to the Company’s pre-Business Combination activity or the related stockholders’ rights, unless 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 (net of taxes payable), 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 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 18 months of the completion of the IPO (or 21 months from the closing date
of the IPO if the Company has executed a letter of intent, agreement in principle or definitive agreement for an initial Business Combination within 18 months from the closing date of the IPO but has not completed the initial Business Combination
within such 18 month period), 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) as promptly as possible, 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 (net of taxes payable and up to $100,000 for 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 18 months of the completion of the IPO (or 21 months from the closing date of the IPO if the Company has executed a
letter of intent, agreement in principle or definitive agreement for an initial Business Combination within 18 months from the closing date of the IPO but has not completed the initial Business Combination within such 18 month period). 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 that has
a fair market value of at least 80% of the assets held in the Trust Account (excluding taxes payable on interest earned), subject to any pre-existing fiduciary or contractual obligations the undersigned might
have; 

  
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 (b) the undersigned shall not participate in the formation of, or become an officer or director
of, any blank check company with a class of securities registered under the Exchange Act until the Company has entered into a definitive agreement regarding a Business Combination or the Company has failed to complete a Business Combination within
18 months of the closing of the IPO (or 21 months from the closing date of the IPO if the Company has executed a letter of intent, agreement in principle or definitive agreement for an initial Business Combination within 18 months from the closing
date of the IPO but has not completed the initial Business Combination within such 18 month period); and 
 (c) 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. Neither the undersigned nor 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) GigAcquisitions, LLC, a Delaware corporation (“Sponsor”), an Affiliate of Dr. Katz, may receive compensation
for administrative services and office space, as provided for under that certain Administrative Services Agreement with the Company dated as of October 11, 2017; 

(b) Sponsor may receive amounts due, if any, under that certain promissory note in the aggregate principal amount of up to $55,000, dated
October 11, 2017, issued by the Company in favor of Sponsor; 
 (c) Mr. Daniels may receive compensation for his services as Vice
President and Chief Financial Officer of the Company, as provided for under that certain Strategic Services Agreement with the Company dated as of October 10, 2017; 

(d) Mr. Daniels may receive an aggregate of 5,000 shares of Common Stock in connection with his services as Vice President and Chief
Financial Officer, and Messrs. Mikulsky, Wang and Porter may each receive an aggregate of 20,000 shares of Common Stock in connection with their services as independent directors of the Company; and 

(e) any of the undersigned 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, 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 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
Representative 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. 

  
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 7. The undersigned represents and warrants that (i) he 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 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 is not currently a defendant in any such criminal proceeding; and (iii) he 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 shall not Transfer (as defined below) any
securities (“Securities”) of the Company held by him or by his Affiliates, other than any Units, or the Offering Shares or Offering Warrants underlying such Units, purchased in the IPO or in the open market after the IPO,
until the earlier of (i) one year 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 150 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 Securities are permitted to be made
(a) to any persons (including their Affiliates and members) participating in the private placement of the private units (as described in the Registration Statement); (b) among the Insiders or to the Company’s executive officers, directors
or employees; (c) in the case of an entity, as a distribution to its partners, stockholders or members upon its liquidation; (d) in the case of an individual, by a bona fide gift to a member of one of the members of the individual’s
immediate family or to a trust, the beneficiary of which is a member of one of the individual’s immediate family; (e) in the case of an individual, by virtue of laws of descent and distribution upon death of the individual; (f) in the
case of an individual, pursuant to a qualified domestic relations order; (g) by pledges to secure obligations incurred in connection with purchases of the Company’s securities; (h) by private sales or transfers made in connection with
the consummation of a Business Combination at prices no greater than the price at which the securities were originally purchased; or (i) to the Company for no value for cancellation in connection with the consummation of a Business
Combination; provided, however, that in any case (other than clause (i)), 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
Transfer any Securities beneficially owned by them, other than any Units, or the Offering Shares or Offering Warrants underlying such Units, purchased in the IPO or in the open market after the IPO. 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 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 

  
 4 

 
action, proceeding or claim against him arising out of or relating in any way to this Letter Agreement (a “Proceeding”) shall be brought and enforced in the courts of the
State of New York of the United States of America for the Southern District of New York, and irrevocably submits to such jurisdiction, which jurisdiction shall be exclusive, (ii) waives any objection to such exclusive jurisdiction and that such
courts represent an inconvenient forum, and (iii) irrevocably agrees to appoint Crowell & Moring LLP as agent for the service of process in the State of New York to receive, for the undersigned and on his 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, directors and director nominees of the Company immediately prior to the IPO, as well as GigAcquisitions, LLC, a Delaware limited liability company, Cowen Investments, LLC, a Delaware
limited liability company, Mr. Irwin Silverberg, Mr. Jeffrey Bernstein and any of their Affiliates; (vi) the “Registration Statement” shall mean the Registration Statement on Form
S-1 filed by the Company with the Securities and Exchange Commission in connection with the IPO, as the same may be amended or supplemented; (vii) “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. 

  
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 16. This Letter Agreement may be executed in one or more counterparts, all of which when taken
together shall be considered one and the same agreement and shall become effective when counterparts have been signed by each party and delivered to each other party, it being understood that the parties need not sign the same counterpart. In the
event that any signature is delivered by facsimile transmission or any other form of electronic delivery, such signature shall create a valid and binding obligation of the party executing (or on whose behalf such signature is executed) with the same
force and effect as if such signature page were an original thereof. 
 [Signature Page Follows] 

  
 6 

 
	
	
	Very truly yours,
	
	  
 Dr. Avi S. Katz, Chairman
of the Board,
 President, Chief Executive Officer, and

Secretary of GigCapital, Inc.

	
	  
 Barrett Daniels, Vice President
and

	Chief Financial Officer of GigCapital, Inc.
	
	  
 John Mikulsky, Director Nominee of
GigCapital, Inc.

	
	  
 Neil Miotto, Director of GigCapital,
Inc.

	
	  
 Peter Wang, Director Nominee of
GigCapital, Inc.

	
	  
 Jack Porter, Director Nominee of
GigCapital, Inc.

  

	
	 Accepted and agreed this         day of December,
2017.

	
	
	GIGCAPITAL, INC.

	
	
	  
 Dr. Avi S. Katz, Chairman
of the Board
 and Chief Executive Officer

 Signature page to Insider Letter (Executive Officers, Directors and Director Nominees)

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