Document:

Exhibit 10.2

 

PROMISSORY NOTE SECURED BY DEED OF
TRUST

 

	$1,155,000.00	Tennessee
	 	
        August 21, 2017

 

FOR VALUE RECEIVED,
the undersigned (“Borrower”) promises to pay to SILVERGATE BANK, a California corporation (“Lender”),
or order, during regular business hours at Silvergate Bank, 4250 Executive Square, Suite 300, La Jolla, California 92037-1492,
Attention: Commercial RE Group, or at such other place as Lender may from time to time designate by written notice to Borrower,
with sufficient information to identify the source and application of such payment, the sum of up to One Million One Hundred Fifty-Five
Thousand and No/100 Dollars ($1,155,000.00), together with interest on the balance of outstanding principal from the disbursement
dates thereof at the per annum rate set forth below. All calculations of interest hereunder shall be computed on the basis of a
360 day year for the actual number of days elapsed.

 

1.           
Interest Rate. The outstanding principal balance under
this Note shall bear interest at a per annum rate of four and one-half percent (4.50%) (the “Contract Rate”).

 

2.           
Monthly Payments of Principal and Interest

 

2.1            
First Month.
Commencing with the date of the initial disbursement of funds through and including September 4, 2017, in which such disbursement
occurs, interest only shall be payable in advance on the date of this Note at the Contract Rate. Interest for such partial month
shall be computed on the basis of a 360-day year and shall be equal to the sum of a per diem interest charge (for each day the
principal balance hereof is outstanding during such partial month) equal to the product of (a) 1/360 and (b) the Contract
Rate and (c) the outstanding principal balance hereunder for the day in question.

 

2.2             
Monthly Payments.
Commencing on October 5, 2017 and continuing on the fifth day of each of the next calendar months thereafter through and including
September 5, 2020, Borrower shall pay to Lender monthly payments of principal and interest in an amount equal to the amount which
would be sufficient to amortize the outstanding principal balance under this Note (as of the date of such payment) at the then
effective Contract Rate over the then remaining portion of an amortization period commencing on September 5, 2017 and ending on
September 4, 2042.

 

3.           
Maturity Date. The entire balance of principal
and accrued interest and other amounts then outstanding on this Note are due and payable on September 5, 2020 (the “Maturity
Date”). Borrower acknowledges that such balance will not equal the regular monthly payment specified in Section 2.

 

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Promissory Note

     

    

 

4.           
Application of Payments. Each payment hereunder
shall be applied when received first to the payment of accrued interest on the principal balance hereof from time to time remaining
unpaid and then to reduce principal and then to amounts payable, if any, into escrow accounts payable under the Loan Documents
for taxes or insurance and then to any unpaid “Past Due Charge” (as defined below); provided, however, upon the occurrence
of an “Event of Default” (as defined below), payments may be applied to any amounts secured by any of the “Security
Instruments” (as defined below) in such order and amounts as is designated by Lender in its sole and absolute discretion.
No such application by Lender shall constitute a cure or waiver of any default by Borrower under the applicable Security Instrument
or under this Note. If notwithstanding the parties’ election and agreement that Tennessee law governs this Note, California
law is applied to this Note, Borrower hereby waives any rights and benefits, if any, that may arise under or by virtue of California
Civil Code Section 2822(a). Without limitation of the foregoing, in the event of any partial payment hereunder, Lender shall
have the sole right and authority to determine which portion of the indebtedness evidenced hereby any partial payment may be applied
against, if any; provided that, nothing in the foregoing shall impose upon Lender any duty or obligation to accept or apply any
partial payment received by Lender hereunder or under the applicable Security Instrument. 

 

5.           
Default; Acceleration. This Note is secured
by that certain Deed of Trust, Assignments of Leases and Rents, Security Agreements and Fixture Filings of even date herewith
by Borrower for the benefit of Lender (individually, a “Security Instrument”, and collectively, the “Security
Instruments”). Upon the occurrence and during the continuance of an “Event of Default” (as defined
in any of the Security Instruments), then, or at any time thereafter, the whole of the unpaid principal hereof, together with
accrued and outstanding interest and all other sums required to be paid under this Note or the Security Instruments (including
the prepayment premium hereinafter described) shall, at the election of Lender and with prior notice of such election, become
due and payable. Lender’s election may be exercised at any time after any such event, and the acceptance of one or more
payments hereon from any person thereafter shall not constitute a waiver of Lender’s election, or of its option to make
such election.

 

6.           
Past Due Charge and Past Due Interest Rate.
Borrower recognizes and acknowledges that any default on any payment, or portion thereof, due hereunder or to be made under any
of the Security Instruments, will result in losses and additional expenses to Lender in servicing the indebtedness evidenced hereby,
and in losses due to Lender’s loss of the use of funds not timely received. Borrower further acknowledges and agrees that
in the event of any such default, Lender would be entitled to damages for the detriment proximately caused thereby, but that it
would be extremely difficult and impracticable to ascertain the extent of or compute such damages. Therefore, if for any reason
Borrower fails to pay any interest or principal required to be paid under this Note, including any payment due at maturity or
upon acceleration, or fails to pay any amounts due under any of the Security Instruments, within ten (10) days of when due, Borrower
shall pay to Lender, in addition to any such delinquent payment, an amount equal to five percent (5%) of such delinquent payment
(“Past Due Charge”). In addition, upon the Maturity Date or upon the occurrence and during the continuance
of an Event of Default (or upon any acceleration), interest shall accrue hereunder at the “Past Due Rate” (as defined
below). Borrower acknowledges that the Past Due Charge and interest at the Past Due Rate agreed to hereunder represent the reasonable
estimate of those damages which would be incurred by Lender, and a fair return to Lender for the loss of the use of the funds
not timely received from Borrower on account of a default by Borrower as herein specified, established by Borrower and Lender
through good faith consideration of the facts and circumstances surrounding the transaction contemplated under this Note as of
the date hereof, but that such Past Due Charge and interest at the Past Due Rate are in addition to, and not in lieu of, any other
right or remedy available to Lender. If any applicable law proscribes the imposition of a past due charge in the amount of the
Past Due Charge herein specified, or limits the rate of the additional interest that may be charged to a rate less than the Past
Due Rate herein specified, then the maximum charge or rate permitted by such law shall be charged by Lender for purposes of this
Section. As used herein, the “Past Due Rate” shall be equal to the lesser of (i) six (6) percentage points
over the Contract Rate, or (ii) the maximum rate of interest permitted to be charged by applicable laws or regulation governing
this Note until paid, such additional interest to be compounded annually. 

 

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Promissory Note

     

    

 

 

7.           
Prepayment. Except as provided in Section 12
herein, Borrower shall have no right to prepay any principal of this Note except that, so long as no default or Event of Default
exists under this Note or any of the Security Instruments as of the date of such prepayment by Borrower, Borrower will have the
privilege, to prepay the principal of this Note (in whole only and not in part) upon at least thirty (30) but not more than sixty
(60) days advance written notice and subject to the following terms and conditions:

 

7.1.       Premium.
Concurrently with such prepayment, Borrower shall pay all accrued and unpaid interest under this Note (whether or not then due),
all amounts then due under this Note and each of the Security Instruments and a prepayment premium equal to the following:

 

(1) A prepayment premium
equal to two percent (2%) of the amount prepaid for a prepayment on or before September 5, 2018; and

 

(2) A prepayment premium
equal to one percent (1%) of the amount prepaid for prepayments from and including September 6, 2018 through and including September
5, 2019; with no prepayment premium thereafter.

 

B.       EXCLUSIVE
RIGHTS. BORROWER ACKNOWLEDGES AND AGREES THAT BORROWER HAS NO RIGHTS OF PREPAYMENT OF THIS NOTE, EXCEPT AS PROVIDED ABOVE;
AND BORROWER FURTHER AGREES THAT, IF THE MATURITY OF THIS NOTE IS ACCELERATED BY LENDER BY REASON OF THE EXISTENCE AND CONTINUANCE
OF AN EVENT OF DEFAULT AND BORROWER OR ANY THIRD PERSON THEREAFTER SEEKS TO PAY SUCH ACCELERATED INDEBTEDNESS OR PURCHASE ANY
OR ALL THE PROPERTIES (INDIVIDUALLY, A “PROPERTY”, AND COLLECTIVELY, THE “PROPERTIES”) ENCUMBERED
BY THE SECURITY INSTRUMENTS SECURING THIS NOTE AT FORECLOSURE SALE, SUCH PAYOFF OR PURCHASE SHALL CONSTITUTE A PREPAYMENT OF PRINCIPAL
HEREUNDER AND A PREMIUM SHALL BE PAYABLE IN AN AMOUNT WHICH SHALL BE COMPUTED PURSUANT TO THIS SECTION 7 (INCLUDING THE PREPAYMENT
PREMIUM).

 

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Promissory Note

     

    

 

8.           
Costs. Borrower promises to pay to Lender, within
five (5) business days after written notice from Lender, all out-of-pocket costs, expenses, disbursements, property taxes, escrow
fees, title charges and legal fees and expenses actually incurred by Lender or its counsel (which must be reasonable provided
no Event of Default has occurred and is existing) in the negotiation, funding, enforcement or attempted enforcement, by foreclosure
or otherwise, of this Note or any of the Security Instruments. Without limitation on the foregoing, Borrower agrees to pay all
out-of-pocket costs of collection, including attorneys’ fees and costs (whether or not for salaried attorneys regularly
employed by Lender) and all costs of any action or proceeding (including any bankruptcy proceeding or any non-judicial foreclosure
or private sale) actually incurred by Lender, in the event any payment is not paid when due, or in case it becomes necessary to
enforce any other obligation of Borrower hereunder or to protect the security for the indebtedness evidenced hereby, or for the
foreclosure by Lender of any of the Security Instruments, or in the event Lender is made a party to any litigation because of
the existence of the indebtedness evidenced by this Note, or because of the existence of any of the Security Instruments. All
such costs are secured by the Security Instruments. The obligation of Borrower to repay all such out-of-pocket costs and any other
advances by Lender are secured by the Security Instruments and shall be deemed to be evidenced by this Note and shall accrue interest
at the Contract Rate or the Past Due Rate, whichever is then applicable.

 

9.           
Waivers. Borrower hereby waives diligence, presentment,
protest and demand, notice of protest, of demand, of nonpayment, of dishonor and of maturity and agrees that time is of the essence
of every provision hereof; and further agrees that any such renewal, extension or modification, or the release or substitution
of any person or security for the indebtedness evidenced hereby, shall not affect the liability of any of such parties for the
indebtedness evidenced by this Note or the obligations under any of the Security Instruments. Any such renewals, extensions, modifications,
releases or substitutions may be made without notice to any of such parties.

 

10.        
Remedies Cumulative. The rights and remedies
of Lender as provided in this Note and in each of the Security Instruments shall be cumulative and concurrent and may be pursued
singly, successively or together against Borrower, any of the Properties, or any other persons or entities who are, or may become
liable for all or any part of this indebtedness, and any other funds, property or security held by Lender for the payment hereof,
or otherwise, at the sole discretion of Lender. Failure to exercise any such right or remedy shall in no event be construed as
a waiver or release of such rights or remedies, or the right to exercise them at any later time. The right, if any, of Borrower,
and all other persons or entities, who are, or may become, liable for this indebtedness, to plead any and all statutes of limitation
as a defense is expressly waived by each and all of such parties to the full extent permissible by law.

 

11.        
Security Instrument Provisions Regarding Transfers; Successors.
Each of the Security Instruments securing this Note contains provisions for the acceleration of the indebtedness evidenced hereby
upon a “Transfer” (as therein defined). Subject to the limitations on Transfer specified in each of the Security Instruments,
the provisions hereof shall be binding on the heirs, legal representatives, successors and assigns of Borrower and shall inure
to the benefit of Lender and the successors and assigns of Lender.

 

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Promissory Note

     

    

 

12.        
Partial Release. Notwithstanding anything herein to the contrary contained
in this Note, Lender shall consent to a partial prepayment of the principal of this Note and thereafter causing a release from
the lien of the applicable Security Instrument any applicable Property, such Property to be released, the “Released
Property”, but only upon the satisfaction of all of the following conditions:

 

a.       Lender
shall have received from Borrower at least thirty (30) days' prior written notice of the date proposed for such release (the “Release
Date”) and the identification of the Released Property;

 

b.       No
Event of Default in any of the Security Instruments shall have occurred and be continuing as of the date of such notice and the
Release Date and no event or condition shall exist that, with the passage of time or giving of notice, would constitute an Event
of Default in any of the Security Instruments;

 

c.       The
release shall occur contemporaneously with the sale of the Released Property pursuant to an arm's-length, bona fide contract to
a person who is not an affiliate of Borrower or any person or entity with any interest in Borrower, whether direct or indirect;

 

d.       Borrower
shall pay to Lender on the Release Date an amount equal to the “Release Price” amount as indicated for such Released
Property on Exhibit “A” attached to this Note (the “Release Price”). The Release Price shall be
applied to the Loan to outstanding principal balance of the Loan (unless an Event of Default exists, in which event, amounts may
be applied in such order as determined by Lender, including the applicable prepayment premium);

 

e.       Borrower
shall have provided Lender with evidence reasonably acceptable to Lender that the Released Property has been formally designated
as a distinct tax lot separate from the remaining Properties;

 

f.       Borrower
shall have provided Lender with evidence reasonably acceptable to Lender that the Released Property and the remaining portion of
the Properties shall be legal lots or parcels in material compliance with the all Tennessee subdivision acts and local ordinances
thereunder and that the remaining portion of the Property has adequate ingress and egress;

 

g.       If
requested by Lender, Borrower, at its sole cost and expense, shall have delivered to Lender a title endorsement to the mortgagee
policy of title insurance delivered to Lender on the date hereof in connection with the Security Instruments insuring that, after
giving effect to such release, such title policy coverage has not been terminated or reduced by such releases; and

 

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Promissory Note

     

    

 

h.       Borrower
shall have paid all of Lender's reasonable out-of-pocket costs and expenses actually incurred by Lender, including, without limitation,
attorneys' fees and expenses, in connection with the release of the Released Property.

 

Upon payment of the Release
Price and the satisfaction of the other conditions set forth in this Section 12 for the release of the Released Property, the security
interests and liens of Lender under the applicable Security Instrument shall be released from the Released Property, and Lender
will execute and deliver, at Borrower’s sole cost and expense, any agreements reasonably requested by Borrower to release
and terminate the lien of the applicable Security Instrument as to the Released Property; provided, however, that
such release and termination shall be without recourse to Lender and made without any representation or warranty, but, in any event,
in standard form that should be reasonably sufficient to remove the lien of the Security Instruments as an exception on the purchaser’s
owner’s title insurance policy for the Released Property. Upon the release and termination of Lender's security interests
and liens under the applicable Security Instrument and the other Loan Documents relating to the Released Property, all references
in the applicable Security Instrument and the other Loan Documents relating to the Released Property shall be deemed deleted, except
as otherwise provided herein with respect to indemnities.

 

13.        
Miscellaneous.

 

13.1         
Manner of Payment; No Offsets.
All payments due hereunder shall be made in lawful money of the United States of America. Such payments shall be made by check
or, upon maturity and otherwise at the option of Lender, by transferring the payment in federal or immediately available funds
by bank wire or interbank transfer for the account of Lender without presentment or surrender of this Note, provided; however,
that any payment of principal or interest received after 5:00 p.m. Pacific time shall be deemed to have been received by Lender
on the next business day and shall bear interest accordingly. All sums due hereunder shall be payable without offset, demand,
abatement or counter-claim of any kind or nature whatsoever, all of which are hereby waived by Borrower.

 

13.2         
Fee for Statement.
For any statement regarding the obligations evidenced hereby to be furnished by Lender, Borrower shall pay the fee then charged
by Lender therefor, not to exceed, however, the maximum fee, if any, allowed by law to be charged by Lender at the time such statement
is requested.

 

13.3         
No Amendment or Waiver Except in Writing.
This Note may be amended or modified only by a writing duly executed by Borrower and Lender, which expressly refers to this Note
and the intent of the parties so to amend this Note. No provision of this Note will be deemed waived by Lender, unless waived
in a writing executed by Lender, which expressly refers to this Note, and no such waiver shall be implied from any act or conduct
of Lender, or any omission by Lender to take action with respect to any provision of this Note or any of the Security Instruments.
No such express written waiver shall affect any other provision of this Note, or cover any default or time period or event, other
than the matter as to which an express written waiver has been given. Without limitation, acceptance of any partial payment shall
not constitute a waiver of any of Lender’s rights, including the right to insist on immediate payment of all amounts due
and payable.

 

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Promissory Note

     

    

 

13.4         
No Intent of Usury.
None of the terms and provisions contained in this Note, or in any of the Security Instruments, or in other documents or instruments
related hereto, shall ever be construed to create a contract for the use, forbearance or detention of money requiring payment
of interest or any other consideration that constitutes interest under applicable law, as the case may be, at a rate in excess
of the maximum interest permitted to be charged by applicable laws or regulation governing this Note (“Usury Laws”).
Borrower shall never be required to pay interest or any other consideration that constitutes interest under applicable law, as
the case may be, on this Note in excess of the maximum interest that may be lawfully charged under such Usury Laws, as made applicable
by the final judgment of a court of competent jurisdiction, and the provisions of this Section shall control over all other provisions
hereof and of any other instrument executed in connection herewith or executed to secure the indebtedness evidenced hereby, which
may be in apparent conflict with this Section. If Lender collects monies which are deemed to constitute interest which would otherwise
increase the effective interest rate on this Note to a rate in excess of that permitted to be charged by such Usury Laws, all
such sums deemed to constitute interest in excess of the maximum rate shall, at the option of Lender, either be credited to the
payment of principal or returned to Borrower.

 

13.5         
Governing Law.
This Note shall be governed by and construed and enforced in accordance with the laws of the State of Tennessee (without regard
to conflicts of laws), except where federal law is applicable (including, without limitation, any applicable federal usury ceiling
or other federal law preempting state usury laws).

 

13.6         
Certain Rules of Construction.
The headings of each Section of this Note are for convenience only and do not define or limit any provision of this Note. The
provisions of this Note shall be construed as a whole according to their common meaning, not strictly for or against any party,
or any person or entity, who is or may become liable for the payment of this Note, and to achieve the objectives of the parties
unconditionally to impose on Borrower the indebtedness evidenced by this Note. Whenever the words “including”, “includes”
or “include” are used in this Note (including any Exhibit hereto), they shall be read non-exclusively as though the
phrase “, without limitation,” immediately followed the same.

 

13.7         
Severability.
If any term of this Note, or the application thereof to any person or circumstances, shall be invalid or unenforceable, the remainder
of this Note, or the application of such term to persons or circumstances other than those as to which it is invalid or unenforceable,
shall not be affected thereby, and each term of this Note shall be valid and enforceable to the fullest extent permitted by law.

 

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Promissory Note

     

    

 

13.8         
Notices.
Any notice which a party is required or may desire to give the other shall be in writing and may be sent by personal delivery
or by mail (either [i] by United States registered or certified mail, return receipt requested, postage prepaid, or [ii] by Federal
Express or similar generally recognized overnight carrier regularly providing proof of delivery), addressed as follows (subject
to the right of a party to designate a different address for itself by notice similarly given at least 15 days in advance):

 

To Lender:

Silvergate Bank

4250 Executive Square

Suite 300

La Jolla, California 92037-1492

Attention: Commercial RE Group

 

To Borrower:

Reven Housing Tennessee, LLC

875 Prospect Street

Suite 304

La Jolla, California 92037

Attention: Thad Meyer

Any notice so given by mail shall be deemed
to have been given as of the date of delivery (whether accepted or refused) established by U.S. Post Office return receipt or the
overnight carrier’s proof of delivery, as the case may be. Any such notice not so given shall be deemed given upon receipt
of the same by the party to whom the same is to be given.

 

14.        
Lender Assignment. Lender may assign, sell or
transfer at any time this Note (and any documents relating thereto and any interest therein).

 

TO THE MAXIMUM EXTENT
PERMITTED BY LAW, BORROWER AND LENDER HEREBY KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVE THE RIGHT TO A TRIAL BY JURY IN RESPECT
OF ANY LITIGATION BASED HEREON, ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS NOTE, THE LOAN, OR ANY OTHER LOAN DOCUMENT, OR
ANY COURSE OF CONDUCT, COURSE OF DEALING, STATEMENT (WHETHER VERBAL OR WRITTEN) OR ACTION OF BORROWER OR LENDER OR ANY EXERCISE
BY ANY PARTY OF THEIR RESPECTIVE RIGHTS UNDER THE LOAN DOCUMENTS OR IN ANY WAY RELATING TO THE LOAN OR ANY OF THE PROPERTIES OR
THIS NOTE. THIS WAIVER IS A MATERIAL INDUCEMENT FOR LENDER TO MAKE THE LOAN TO BORROWER.

 

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Promissory Note

     

    

 

IN WITNESS WHEREOF,
this Note is executed as of the date first written above.

 

	 	“BORROWER”	 	 
	 	 	 	 	 	 	 
	 	 	 	 	 	 	 
	 	REVEN HOUSING TENNESSEE, LLC,	 	 
	 	a Delaware limited liability company	 	 
	 	 	 	 	 	 	 
	 	By:	Reven Housing REIT OP, LLC,	 	 
	 	 	a Delaware limited liability company,	 	 
	 	 	its Sole Member	 	 
	 	 	 	 	 	 	 
	 	 	By: 	 		 	 
	 	 	 	Thad Meyer	 	 	 
	 	 	 	Chief Financial Officer	 	 	 

  

 

    	 	 	 

Promissory NoteExhibit 4.1

 

.ZQ|CERT#|COY|CLS|RGSTRY|ACCT#|TRANSTYPE|RUN#|TRANS#   1 COMMON STOCK PAR VALUE $0.001 COMMON STOCK Certificate Number ZQ00000000   THIS CERTIFIES THAT QUANTERIX CORPORATION INCORPORATED UNDER THE LAWS OF THE   STATE OF DELAWARE ** Mr. Alexander David Sample **** Mr. Alexander David   Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample ****   Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David MR. SAMPLE & MRS. SAMPLE & Shares * * 000000   * * * * * * * * * * * * * * * * * * * * * 000000 * * * * * * * * * * * * * *   * * * * * * * 000000 * * * * * * * * * * * * * * * * * * * * * 000000 * * * *   * * * * * * * * * * * * * * * * * 000000 * * * * * * * * * * * * * * SEE   REVERSE FOR CERTAIN DEFINITIONS David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample MR. SAMPLE & MRS. SAMPLE   CUSIP 74766Q 10 1 is the owner of   **000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares***   ***ZERO HUNDRED THOUSAND 000000**Shares*   **000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0   00000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00   0000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000   ZERO HUNDRED AND ZERO***   00**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000*   Shares****00000   0**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000   **Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000*   *Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**   Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**S   THIS CERTIFICATE IS TRANSFERABLE IN CITIES DESIGNATED BY THE TRANSFER AGENT,   AVAILABLE ONLINE AT www.computershare.com FULLY-PAID AND NON-ASSESSABLE   SHARES OF COMMON STOCK OF Quanterix Corporation (hereinafter called the   “Company”), transferable on the books of the Company in person or by duly   authorized attorney, upon surrender of this Certificate properly endorsed.   This Certificate and the shares represented hereby, are issued and shall be   held subject to all of the provisions of the Certificate of Incorporation, as   amended, and the By-Laws, as amended, of the Company (copies of which are on   file with the Company and with the Transfer Agent), to all of which each   holder, by acceptance hereof, assents. This Certificate is not valid unless   countersigned and registered by the Transfer Agent and Registrar. Witness the   facsimile seal of the Company and the facsimile signatures of its duly   authorized officers. DATED DD-MMM-YYYY President COUNTERSIGNED AND   REGISTERED: COMPUTERSHARE TRUST COMPANY, N.A. TRANSFER AGENT AND REGISTRAR,   April 25, 2007 CUSIP Holder ID Insurance Value Number of Shares DTC Certificate   Numbers 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890   1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 Total   Transaction XXXXXX XX X XXXXXXXXXX 1,000,000.00 123456 12345678   123456789012345 PO BOX 43004, Providence, RI 02940-3004 Num/No. Denom. Total   1 2 3 4 5 6 7 1 2 3 4 5 6 1 2 3 4 5 6 MR A SAMPLE DESIGNATION (IF ANY) ADD 1   ADD 2 ADD 3 ADD 4 Secretary By AUTHORIZED SIGNATURE 

    

 

 

 . QUANTERIX CORPORATION THE COMPANY WILL   FURNISH WITHOUT CHARGE TO EACH SHAREHOLDER WHO SO REQUESTS, A SUMMARY OF THE   POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE, PARTICIPATING, OPTIONAL OR   OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OF THE COMPANY AND THE   QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND RIGHTS,   AND THE VARIATIONS IN RIGHTS, PREFERENCES AND LIMITATIONS DETERMINED FOR EACH   SERIES, WHICH ARE FIXED BY THE CERTIFICATE OF INCORPORATION OF THE COMPANY,   AS AMENDED, AND THE RESOLUTIONS OF THE BOARD OF DIRECTORS OF THE COMPANY, AND   THE AUTHORITY OF THE BOARD OF DIRECTORS TO DETERMINE VARIATIONS FOR FUTURE   SERIES. SUCH REQUEST MAY BE MADE TO THE OFFICE OF THE SECRETARY OF THE   COMPANY OR TO THE TRANSFER AGENT. THE BOARD OF DIRECTORS MAY REQUIRE THE   OWNER OF A LOST OR DESTROYED STOCK CERTIFICATE, OR HIS LEGAL REPRESENTATIVES,   TO GIVE THE COMPANY A BOND TO INDEMNIFY IT AND ITS TRANSFER AGENTS AND   REGISTRARS AGAINST ANY CLAIM THAT MAY BE MADE AGAINST THEM ON ACCOUNT OF THE   ALLEGED LOSS OR DESTRUCTION OF ANY SUCH CERTIFICATE. The following   abbreviations, when used in the inscription on the face of this certificate,   shall be construed as though they were written out in full according to   applicable laws or regulations: TEN COM - as tenants in commonUNIF GIFT MIN   ACT - ............................................Custodian   ................................................ (Cust)(Minor) TEN ENT - as   tenants by the entiretiesunder Uniform Gifts to Minors   Act......................................................... (State) JT   TEN-as joint tenants with right of survivorshipUNIF TRF MIN ACT -   ............................................Custodian (until age   ................................) and not as tenants in common(Cust)   .............................under Uniform Transfers to Minors Act   ................... (Minor)(State) Additional abbreviations may also be used   though not in the above list. For value received, hereby sell, assign and   transfer unto PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF   ASSIGNEE (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP   CODE, OF ASSIGNEE) Shares of the common stock represented by the within   Certificate, and do hereby irrevocably constitute and appoint Attorney to   transfer the said stock on the books of the within-named Company with full   power of substitution in the premises. Dated: 20 Signature: Signature(s)   Guaranteed: Medallion Guarantee Stamp THE SIGNATURE(S) SHOULD BE GUARANTEED   BY AN ELIGIBLE GUARANTOR INSTITUTION (Banks, Stockbrokers, Savings and Loan   Associations and Credit Unions) WITH MEMBERSHIP IN AN APPROVED SIGNATURE   GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15. Signature:   Notice: The signature to this assignment must correspond with the name as   written upon the face of the certificate, in every particular, without   alteration or enlargement, or any change whatever. The IRS requires that the   named transfer agent (“we”) report the cost basis of certain shares or units   acquired after January 1, 2011. If your shares or units are covered by the   legislation, and you requested to sell or transfer the shares or units using   a specific cost basis calculation method, then we have processed as you   requested. If you did not specify a cost basis calculation method, then we have   defaulted to the first in, first out (FIFO) method. Please consult your tax   advisor if you need additional information about cost basis. If you do not   keep in contact with the issuer or do not have any activity in your account   for the time period specified by state law, your property may become subject   to state unclaimed property laws and transferred to the appropriate state.

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