EX-10.5






 Exhibit 10.5 

Thayer Ventures Acquisition Corporation 

August 11, 2020 
 Thayer Ventures Acquisition
Corporation 
 25852 McBean Parkway 
 Suite 508 

Valencia, CA 91355(415) 782-1414 
 RE:
Subscription Agreement for Founder Shares 
 Ladies and Gentlemen: 

We are pleased to accept the offer Thayer Ventures Acquisition Holdings LLC (the “Subscriber” or “you”) has
made to purchase 5,031,250 shares (“Founder Shares”) of the common stock, $0.0001 par value per share (“Common Stock”), of Thayer Ventures Acquisition Corporation, a Delaware corporation (the
“Company”), up to 656,250 of which are subject to forfeiture by you if the underwriters of the proposed initial public offering (“IPO”) of the Company pursuant to the registration statement on Form S-1 expected to
be filed by the Company in connection with the IPO (the “Registration Statement”) do not fully exercise their over-allotment option (the “Over-allotment Option”) as described below. The terms (this
“Agreement”) on which the Company is willing to sell the Founder Shares to the Subscriber, and the Company and the Subscriber’s agreements regarding such Founder Shares, are as follows: 

1. Purchase of Founder Shares. For the sum of $25,000.00 (the “Purchase Price”), which the Company
acknowledges receiving via promissory note, attached hereto as Exhibit A the Company hereby sells and issues the Founder Shares to the Subscriber, and the Subscriber hereby purchases the Founder Shares from the Company, subject to the
forfeiture provisions of Section 3 below, on the terms and subject to the conditions set forth in this Agreement. Concurrently with the Subscriber’s execution of this Agreement, the Company shall, at its option, deliver to the Subscriber a
certificate registered in the Subscriber’s name representing the Founder Shares, or effect such delivery in book-entry form. 

2. Representations, Warranties and Agreements. 

2.1. The Subscriber’s Representations, Warranties and Agreements. To induce the Company to issue the Founder Shares
to the Subscriber, the Subscriber hereby represents and warrants to the Company and agrees with the Company as follows: 

2.1.1. No Government Recommendation or Approval. The Subscriber understands that no federal or state agency has passed
upon or made any recommendation or endorsement of the offering of the Founder Shares. 
 2.1.2. No Conflicts. The
execution, delivery and performance of this Agreement and the consummation by the Subscriber of the transactions contemplated hereby do not violate, conflict with or constitute a default under the formation and governing documents of the Subscriber,
(ii) any agreement, indenture or instrument to which the Subscriber is a party, (iii) any law, statute, rule or regulation to which the Subscriber is subject, or (iv) any agreement, order, judgment or decree to which the Subscriber is
subject. 













 2.1.3. Organization and Authority. The Subscriber is a Delaware
limited liability company, validly existing and in good standing under the laws of Delaware and possesses all requisite power and authority necessary to carry out the transactions contemplated by this Agreement. Upon execution and delivery by you,
this Agreement will be a legal, valid and binding agreement of the Subscriber, enforceable against the Subscriber in accordance with its terms, except as such enforceability may be limited by applicable bankruptcy, insolvency, fraudulent conveyance
or similar laws affecting the enforcement of creditors’ rights generally and subject to general principles of equity (regardless of whether enforcement is sought in a proceeding at law or in equity). 

2.1.4. Experience, Financial Capability and Suitability. The Subscriber is: (i) sophisticated in financial matters
and is able to evaluate the risks and benefits of the investment in the Founder Shares and (ii) able to bear the economic risk of its investment in the Founder Shares for an indefinite period of time because the Founder Shares have not been
registered under the Securities Act (as defined below) and therefore cannot be resold unless such transaction is registered under the Securities Act or an exemption from such registration is available. The Subscriber is capable of evaluating the
merits and risks of its investment in the Company and has the capacity to protect its own interests. The Subscriber must bear the economic risk of this investment until the Founder Shares are sold pursuant to: (x) an effective registration
statement under the Securities Act or (y) an exemption from registration available with respect to such sale. The Subscriber is able to bear the economic risks of an investment in the Founder Shares and to afford a complete loss of the
Subscriber’s investment in the Founder Shares. 
 2.1.5. Access to Information; Independent Investigation. Prior
to the execution of this Agreement, the Subscriber has had the opportunity to ask questions of and receive answers from representatives of the Company concerning an investment in the Company, as well as the finances, operations, business and
prospects of the Company, and the opportunity to obtain additional information to verify the accuracy of all information so obtained. In determining whether to make this investment, the Subscriber has relied solely on the Subscriber’s own
knowledge and understanding of the Company and its business based upon the Subscriber’s own due diligence investigation and the information furnished pursuant to this paragraph. The Subscriber understands that no person has been authorized to
give any information or to make any representations which were not furnished pursuant to this Section 2 and the Subscriber has not relied on any other representations or information in making its investment decision, whether written or oral,
relating to the Company, its operations or its prospects. 
 2.1.6. Regulation D Offering. The Subscriber represents
that it is an “accredited investor” as such term is defined in Rule 501(a) of Regulation D under the Securities Act of 1933, as amended (the “Securities Act”), and acknowledges the sale contemplated hereby is being made in
reliance on a private placement exemption applicable to “accredited investors” within the meaning of Section 501(a) of Regulation D under the Securities Act or similar exemptions under federal and state law. 

2.1.7. Investment Purposes. The Subscriber is purchasing the Founder Shares solely for investment purposes, for the
Subscriber’s own account and not for the account or benefit of any other person, and not with a view towards the distribution or dissemination thereof. The Subscriber did not enter into this Agreement as a result of any general solicitation or
general advertising within the meaning of Rule 502 of Regulation D under the Securities Act. 













 2.1.8. Restrictions on Transfer; Shell Company. The Subscriber
understands the Founder Shares are being offered in a transaction not involving a public offering within the meaning of the Securities Act. The Subscriber understands the Founder Shares will be “restricted securities” as defined in Rule
144(a)(3) under the Securities Act and the Subscriber understands that any certificate or book entries representing the Founder Shares will contain a legend in respect of such restrictions. If in the future the Subscriber decides to offer, resell,
pledge or otherwise transfer the Founder Shares, such Founder Shares may be offered, resold, pledged or otherwise transferred only in accordance with the provisions of Section 5 hereof. The Subscriber agrees that if any transfer of its Founder
Shares or any interest therein is proposed to be made, as a condition precedent to any such transfer, the Subscriber may be required to deliver to the Company an opinion of counsel satisfactory to the Company. Absent registration under the
Securities Act or an exemption therefrom, the Subscriber agrees not to resell the Founder Shares. The Subscriber further acknowledges that because the Company is a shell company, Rule 144 may not be available to the Subscriber for the resale of the
Founder Shares until at least one year following consummation of the initial business combination of the Company, despite technical compliance with the certain requirements of Rule 144 and the release or waiver of any contractual transfer
restrictions. 
 2.1.9. No Governmental Consents. No governmental, administrative or other third party consents or
approvals are required, necessary or appropriate on the part of the Subscriber in connection with the transactions contemplated by this Agreement. 

2.2. Company’s Representations, Warranties and Agreements. To induce the Subscriber to purchase the Founder Shares,
the Company hereby represents and warrants to the Subscriber and agrees with the Subscriber as follows: 
 2.2.1.
Organization and Corporate Power. The Company is a Delaware corporation and is qualified to do business in every jurisdiction in which the failure to so qualify would reasonably be expected to have a material adverse effect on the financial
condition, operating results or assets of the Company. The Company possesses all requisite corporate power and authority necessary to carry out the transactions contemplated by this Agreement. 

2.2.2. No Conflicts. The execution, delivery and performance of this Agreement and the consummation by the Company of
the transactions contemplated hereby do not violate, conflict with or constitute a default under the Certificate of Incorporation or Bylaws of the Company, (ii) any agreement, indenture or instrument to which the Company is a party,
(iii) any law, statute, rule or regulation to which the Company is subject, or (iv) any agreement, order, judgment or decree to which the Company is subject. 

2.2.3. Title to Securities. Upon issuance in accordance with, and payment pursuant to, the terms hereof, the Founder
Shares will be duly and validly issued, fully paid and nonassessable. Upon issuance in accordance with, and payment pursuant to, the terms hereof the Subscriber will have or receive good title to the Founder Shares, free and clear of all liens,
claims and encumbrances of any kind, other than (a) transfer restrictions hereunder and other agreements to which the Founder Shares may be subject which have been notified to the Subscriber in writing,(b) transfer restrictions under federal
and state securities laws, and (c) liens, claims or encumbrances imposed due to the actions of the Subscriber. 













 2.2.4. No Adverse Actions. There are no actions, suits,
investigations or proceedings pending, threatened against or affecting the Company which: (i) seek to restrain, enjoin, prevent the consummation of or otherwise affect the transactions contemplated by this Agreement or (ii) question the
validity or legality of any transactions or seek to recover damages or to obtain other relief in connection with any transactions. 

3. Forfeiture of Founder Shares. 

3.1. Partial or No Exercise of the Over-allotment Option. In the event the Over-allotment Option granted to the
underwriters of the IPO is not exercised in full, the Subscriber acknowledges and agrees that it (and, if applicable, any transferee of Shares) shall automatically forfeit at the time such Over-allotment Option expires (or earlier if the
underwriters of the IPO waive their ability to exercise such Over-allotment Option) any and all rights to such number of Founder Shares (up to an aggregate of 656,250 Founder Shares and pro rata based upon the percentage of the Over-allotment Option
exercised) such that immediately following such forfeiture, the Subscriber (and any such transferees), collectively with all other initial stockholders of the Company prior to the IPO, will own an aggregate number of Founder Shares equal to 20% of
the total number of shares of Common Stock issued in the IPO. 
 3.2. Termination of Rights as Stockholder. If any of
the Founder Shares are forfeited in accordance with this Section 3, then after such time the Subscriber (or its successor in interest), shall no longer have any rights as a holder of such forfeited Founder Shares, and the Company shall take
such action as is appropriate to cancel such forfeited Founder Shares. 
 3.3. Share Certificates. In the event an
adjustment to any certificate representing the Founder Shares purchased pursuant hereto is required pursuant to this Section 3, then the Subscriber shall return such certificate to the Company or its designated agent as soon as practicable upon
its receipt of notice from the Company advising the Subscriber of such adjustment, following which a new certificate shall be issued in such amount representing the adjusted number of Founder Shares held by the Subscriber. Such new certificate, if
any, shall be returned to the Subscriber as soon as practicable. Any such adjustment for any uncertificated securities held by the Subscriber shall be made in book-entry form. 

4. Waiver of Liquidation Distributions; Redemption Rights. In connection with the Founder Shares purchased pursuant to
this Agreement, the Subscriber hereby waives any and all right, title, interest or claim of any kind in or to any distributions by the Company from the trust account which will be established for the benefit of the Company’s public stockholders
and into which substantially all of the proceeds of the IPO will be deposited (the “Trust Account”), in the event of a liquidation of the Company upon the Company’s failure to timely complete an initial business combination.
For purposes of clarity, in the event the Subscriber purchases securities in the IPO or securities of the Company issued in the IPO in the aftermarket, any additional Common Stock so purchased shall be eligible to receive any liquidating
distributions from the Trust Account by the Company. However, in no event will the Subscriber have the right to redeem any shares of Common Stock into funds held in the Trust Account upon the successful completion of an initial business combination.

 5. Restrictions on Transfer. 

5.1. Securities Law Restrictions. In addition to any restrictions to be contained in that certain stock escrow agreement
(commonly known as an “Escrow Agreement”) to be entered into between the Company, the Subscriber and the Company’s transfer agent in connection with the 













 
consummation of the IPO, the Subscriber agrees not to sell, transfer, pledge, hypothecate or otherwise dispose of all or any part of the Founder Shares unless, prior thereto (a) a
registration statement on the appropriate form under the Securities Act and applicable state securities laws with respect to the Founder Shares proposed to be transferred shall then be effective or (b) the Company has received an opinion from
counsel reasonably satisfactory to the Company, that such registration is not required because such transaction is exempt from registration under the Securities Act and the rules promulgated by the Securities and Exchange Commission thereunder and
with all applicable state securities laws. 
 5.2. Lock-up. The Subscriber acknowledges that the Founder Shares will
be subject to lock-up provisions (the “Lock-up”) contained in the Escrow Agreement. Pursuant to the Escrow Agreement, the Subscriber will agree (subject to certain customary exceptions) not to sell, transfer, pledge, hypothecate or
otherwise dispose of all or any part of the Founder Shares until the earlier to occur of: (A) one year after the completion of the Company’s initial business combination or (B) subsequent to the Company’s initial business
combination, (x) if 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 the Company’s initial business combination, or (y) the date on which the Company completes a liquidation, merger, capital stock exchange, reorganization 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. 

5.3. Restrictive Legends. All certificates representing the Founder Shares shall have endorsed thereon legends
substantially as follows: 
 “THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
1933, AS AMENDED, OR ANY STATE SECURITIES LAWS AND NEITHER THE SECURITIES NOR ANY INTEREST THEREIN MAY BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED OF EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT OR SUCH LAWS
OR AN EXEMPTION FROM REGISTRATION UNDER SUCH ACT AND SUCH LAWS WHICH, IN THE OPINION OF COUNSEL (IF THE COMPANY SO REQUESTS), IS AVAILABLE.” 

“THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO LOCKUP PROVISIONS AND MAY NOT BE OFFERED, SOLD,
TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED DURING THE TERM OF THE LOCKUP PERIOD.” 
 5.4. Additional Founder Shares
or Substituted Securities. In the event of the declaration of a stock dividend, the declaration of a special dividend payable in a form other than Common Stock, a spin-off, a stock split, an adjustment in conversion ratio, a recapitalization or
a similar transaction affecting the Company’s outstanding Common Stock without receipt of consideration, any new, substituted or additional securities or other property which are by reason of such transaction distributed with respect to any
Founder Shares subject to this Section 5 or into which such Founder Shares thereby become convertible shall immediately be subject to this Section 5 and Section 3. Appropriate adjustments to reflect the distribution of such securities
or property shall be made to the number or class of Founder Shares subject to this Section 5 and Section 3. 













 5.5. Registration Rights. The Subscriber acknowledges that the
Founder Shares are being purchased pursuant to an exemption from the registration requirements of the Securities Act and will become freely tradable only after certain conditions are met or they are registered pursuant to a registration rights
agreement to be entered into with the Company prior to the closing of the IPO (the “Registration Rights Agreement”). 

6. Other Agreements. 

6.1. Further Assurances. The Subscriber agrees to execute such further instruments and to take such further action as
may reasonably be necessary to carry out the intent of this Agreement. 
 6.2. Notices. All notices, statements or
other documents which are required or contemplated by this Agreement shall be in writing and delivered: (i) personally or sent by first class registered or certified mail, overnight courier service or facsimile or electronic transmission to the
address designated in writing, (ii) by facsimile to the number most recently provided to such party or such other address or fax number as may be designated in writing by such party and (iii) by electronic mail, to the electronic mail
address most recently provided to such party or such other electronic mail address as may be designated in writing by such party. Any notice or other communication so transmitted shall be deemed to have been given on the day of delivery, if
delivered personally, on the business day following receipt of written confirmation, if sent by facsimile or electronic transmission, one (1) business day after delivery to an overnight courier service or five (5) days after mailing if
sent by mail. 
 6.3. Entire Agreement. This Agreement, together with that certain Escrow Agreement to be entered into
between the Subscriber and the Company and the Registration Rights Agreement, each substantially in the form to be filed as an exhibit to the Registration Statement, embodies the entire agreement and understanding between the Subscriber and the
Company with respect to the subject matter hereof and supersedes all prior oral or written agreements and understandings relating to the subject matter hereof. No statement, representation, warranty, covenant or agreement of any kind not expressly
set forth in this Agreement shall affect, or be used to interpret, change or restrict, the express terms and provisions of this Agreement. 

6.4. Modifications and Amendments. The terms and provisions of this Agreement may be modified or amended only by written
agreement executed by all parties hereto. 
 6.5. Waivers and Consents. The terms and provisions of this Agreement may
be waived, or consent for the departure therefrom granted, only by written document executed by the party entitled to the benefits of such terms or provisions. No such waiver or consent shall be deemed to be or shall constitute a waiver or consent
with respect to any other terms or provisions of this Agreement, whether or not similar. Each such waiver or consent shall be effective only in the specific instance and for the purpose for which it was given, and shall not constitute a continuing
waiver or consent. 
 6.6. Assignment. The rights and obligations under this Agreement may not be assigned by either
party hereto without the prior written consent of the other party. 
 6.7. Benefit. All statements, representations,
warranties, covenants and agreements in this Agreement shall be binding on the parties hereto and shall inure to the benefit of the respective successors and permitted assigns of each party hereto. Nothing in this Agreement shall be construed to
create any rights or obligations except among the parties hereto, and no person or entity shall be regarded as a third-party beneficiary of this Agreement. 













 6.8. Governing Law. This Agreement and the rights and obligations of
the parties hereunder shall be construed in accordance with and governed by the laws of Delaware applicable to contracts wholly performed within the borders of such state. 

6.9. Severability. In the event that any court of competent jurisdiction shall determine that any provision, or any
portion thereof, contained in this Agreement shall be unreasonable or unenforceable in any respect, then such provision shall be deemed limited to the extent that such court deems it reasonable and enforceable, and as so limited shall remain in full
force and effect. In the event that such court shall deem any such provision, or portion thereof, wholly unenforceable, the remaining provisions of this Agreement shall nevertheless remain in full force and effect. 

6.10. No Waiver of Rights, Powers and Remedies. No failure or delay by a party hereto in exercising any right, power or
remedy under this Agreement, and no course of dealing between the parties hereto, shall operate as a waiver of any such right, power or remedy of such party. No single or partial exercise of any right, power or remedy under this Agreement by a party
hereto, nor any abandonment or discontinuance of steps to enforce any such right, power or remedy, shall preclude such party from any other or further exercise thereof or the exercise of any other right, power or remedy hereunder. The election of
any remedy by a party hereto shall not constitute a waiver of the right of such party to pursue other available remedies. No notice to or demand on a party not expressly required under this Agreement shall entitle the party receiving such notice or
demand to any other or further notice or demand in similar or other circumstances or constitute a waiver of the rights of the party giving such notice or demand to any other or further action in any circumstances without such notice or demand. 

6.11. Survival of Representations and Warranties. All representations and warranties made by the parties hereto in this
Agreement or in any other agreement, certificate or instrument provided for or contemplated hereby, shall survive the execution and delivery hereof and any investigations made by or on behalf of the parties. 

6.12. No Broker or Finder. Each of the parties hereto represents and warrants to the other that no broker, finder or
other financial consultant has acted on its behalf in connection with this Agreement or the transactions contemplated hereby in such a way as to create any liability on the other. Each of the parties hereto agrees to indemnify and hold the other
harmless from any claim or demand for commission or other compensation by any broker, finder, financial consultant or similar agent claiming to have been employed by or on behalf of such party and to bear the cost of legal expenses incurred in
defending against any such claim. 
 6.13. Headings and Captions. The headings and captions of the various sections of
this Agreement are for convenience of reference only and shall in no way modify or affect the meaning or construction of any of the terms or provisions hereof. 

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













 6.15. Construction. The words “include,”
“includes,” and “including” will be deemed to be followed by “without limitation.” Pronouns in masculine, feminine, and neuter genders will be construed to include any other gender, and words in the
singular form will be construed to include the plural and vice versa, unless the context otherwise requires. The words “this Agreement,” “herein,” “hereof,” “hereby,”
“hereunder,” and words of similar import refer to this Agreement as a whole and not to any particular section unless expressly so limited. The parties hereto intend that each representation, warranty, and covenant contained herein
will have independent significance. If any party hereto has breached any representation, warranty, or covenant contained herein in any respect, the fact that there exists another representation, warranty or covenant relating to the same subject
matter (regardless of the relative levels of specificity) which such party hereto has not breached will not detract from or mitigate the fact that such party hereto is in breach of the first representation, warranty, or covenant. 

6.16. Mutual Drafting. This Agreement is the joint product of the Subscriber and the Company and each provision hereof
has been subject to the mutual consultation, negotiation and agreement of such parties and shall not be construed for or against any party hereto. 

7. Voting and Redemption of Founder Shares. The Subscriber agrees to vote the Founder Shares in favor of an initial
business combination that the Company negotiates and submits for approval to the Company’s stockholders. 
 8.
Indemnification. Each party shall indemnify the other against any loss, cost or damages (including reasonable attorneys’ fees and expenses) incurred as a result of such party’s breach of any representation, warranty, covenant or
agreement in this Agreement. 
 [Signature Page Follows] 













 If the foregoing accurately sets forth our understanding and agreement, please sign the
enclosed copy of this Agreement and return it to us. 
  

			
	Very truly yours,
	
	THAYER VENTURES ACQUISITION CORPORATION
		
	By:	 	 /s/ Mark Farrell

	Name: Mark Farrell
	Title: Co-Chief Executive Officer


  

			
	Accepted and agreed this 11th day of August, 2020.
	
	THAYER VENTURES ACQUISITION HOLDINGS LLC
		
	By:	 	 /s/ Christopher Hemmeter

	Name: Christopher Hemmeter
	Title: Manager














 Exhibit A 

Promissory Note 













 THIS PROMISSORY NOTE (THIS “NOTE”) HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE “SECURITIES ACT”). THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT ONLY AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF UNDER THE SECURITIES ACT OR AN OPINION OF COUNSEL REASONABLY
SATISFACTORY IN FORM, SCOPE AND SUBSTANCE TO THE MAKER THAT SUCH REGISTRATION IS NOT REQUIRED. 
 PROMISSORY NOTE 

 

			
	Principal Amount: up to $25,000	  	Dated as of August 11, 2020

 Thayer Ventures Acquisition Holdings LLC., a Delaware limited liability company (the
“Maker”), promises to pay to the order of Thayer Ventures Acquisition Corporation, a Delaware corporation, or its registered assigns or successors in interest (the “Payee”), or order, the principal sum of up to
twenty-five thousand U.S. dollars ($25,000) in lawful money of the United States of America, on the terms and conditions described below. All payments on this Note shall be made by check or wire transfer of immediately available funds or as
otherwise determined by the Maker to such account as the Payee may from time to time designate by written notice in accordance with the provisions of this Note. 

1. Principal. The principal balance of this Promissory Note (the “Note”) shall be payable promptly after the earlier to occur
of the date on which Payee consummates an initial public offering of its securities (the “IPO”) or the date on which the Payee determined not to conduct an initial public offering of its securities. The principal balance may be
prepaid at any time. 
 2. Interest. No interest shall accrue on the unpaid principal balance of this Note. 

3. Application of Payments. All payments shall be applied first to payment in full of any costs incurred in the collection of any sum
due under this Note, including (without limitation) reasonable attorney’s fees, then to the payment in full of any late charges and finally to the reduction of the unpaid principal balance of this Note. 

4. Events of Default. The following shall constitute an event of default (“Event of Default”): 

(a) Failure to Make Required Payments. Failure by Maker to pay the principal amount due pursuant to this Note within five
(5) business days of the date specified in Section 1 above. 
 (b) Voluntary Bankruptcy, Etc. The commencement by Maker of a
voluntary case under any applicable bankruptcy, insolvency, reorganization, rehabilitation or other similar law, or the consent by it to the appointment of or taking possession by a receiver, liquidator, assignee, trustee, custodian, sequestrator
(or other similar official) of Maker or for any substantial part of its property, or the making by it of any assignment for the benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the taking of
corporate action by Maker in furtherance of any of the foregoing. 
 (c) Involuntary Bankruptcy, Etc. The entry of a decree or order
for relief by a court having jurisdiction in the premises in respect of Maker in an involuntary case under any applicable bankruptcy, insolvency or other similar law, or appointing a receiver, liquidator, assignee, custodian, trustee, sequestrator
(or similar official) of Maker or for any substantial part of its property, or ordering the winding-up or liquidation of its affairs, and the continuance of any such decree or order unstayed and in effect for
a period of 60 consecutive days. 













 5. Remedies. 

(a) Upon the occurrence of an Event of Default specified in Section 4(a) hereof, Payee may, by written notice to Maker, declare this Note
to be due immediately and payable, whereupon the unpaid principal amount of this Note, and all other amounts payable thereunder, shall become immediately due and payable without presentment, demand, protest or other notice of any kind, all of which
are hereby expressly waived, anything contained herein or in the documents evidencing the same to the contrary notwithstanding. 
 (b) Upon
the occurrence of an Event of Default specified in Sections 4(b) and 4(c), the unpaid principal balance of this Note, and all other sums payable with regard to this Note, shall automatically and immediately become due and payable, in all cases
without any action on the part of Payee. 
 6. Waivers. Maker and all endorsers and guarantors of, and sureties for, this Note waive
presentment for payment, demand, notice of dishonor, protest, and notice of protest with regard to the Note, all errors, defects and imperfections in any proceedings instituted by Payee under the terms of this Note, and all benefits that might
accrue to Maker by virtue of any present or future laws exempting any property, real or personal, or any part of the proceeds arising from any sale of any such property, from attachment, levy or sale under execution, or providing for any stay of
execution, exemption from civil process, or extension of time for payment; and Maker agrees that any real estate that may be levied upon pursuant to a judgment obtained by virtue hereof, on any writ of execution issued hereon, may be sold upon any
such writ in whole or in part in any order desired by Payee. 
 7. Unconditional Liability. Maker hereby waives all notices in
connection with the delivery, acceptance, performance, default, or enforcement of the payment of this Note, and agrees that its liability shall be unconditional, without regard to the liability of any other party, and shall not be affected in any
manner by any indulgence, extension of time, renewal, waiver or modification granted or consented to by Payee, and consents to any and all extensions of time, renewals, waivers, or modifications that may be granted by Payee with respect to the
payment or other provisions of this Note, and agrees that additional makers, endorsers, guarantors, or sureties may become parties hereto without notice to Maker or affecting Maker’s liability hereunder. 

8. Notices. All notices, statements or other documents which are required or contemplated by this Agreement shall be: (i) in
writing and delivered personally or sent by first class registered or certified mail, overnight courier service to the address designated in writing by such party, (ii) by facsimile to the number most recently provided to such party or such
other address or fax number as may be designated in writing by such party or (iii) by electronic mail, to the electronic mail address most recently provided to such party or such other electronic mail address as may be designated in writing by
such party. Any notice or other communication so transmitted shall be deemed to have been given on the day of delivery, if delivered personally, on the business day following receipt of written confirmation, if sent by facsimile or electronic mail,
one (1) business day after delivery to an overnight courier service or five (5) days after mailing if sent by mail. 
 9.
Construction. THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF NEW YORK, WITHOUT REGARD TO CONFLICT OF LAW PROVISIONS THEREOF. 

10. Severability. Any provision contained in this Note which is prohibited or unenforceable in any jurisdiction shall, as to such
jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable
such provision in any other jurisdiction. 













 12. Amendment; Waiver. Any amendment hereto or waiver of any provision hereof may be
made with, and only with, the written consent of the Maker and the Payee. 
 13. Assignment. No assignment or transfer of this Note
or any rights or obligations hereunder may be made by any party hereto (by operation of law or otherwise) without the prior written consent of the other party hereto and any attempted assignment without the required consent shall be void. 

[Signature page follows] 













 IN WITNESS WHEREOF, Maker, intending to be legally bound hereby, has caused this Note
to be duly executed by the undersigned as of the day and year first above written. 
  

					
	Thayer Ventures Acquisition Holdings LLC.
	 a Delaware limited liability company

		
	By:	 	/s/ Mark Farrell
		 	Name:	 	Mark Farrell
		 	Title:	 	Manager