FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

DEKKERS MARIJN E
2. Issuer Name and Ticker or Trading Symbol

Quanterix Corp [ QTRX ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__X__ Director                    _____ 10% Owner
_____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle)

C/O QUANTERIX CORPORATION,, 900 MIDDLESEX TURNPIKE
3. Date of Earliest Transaction (MM/DD/YYYY)

1/11/2021
(Street)

BILLERICA, MA 01821
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 1/11/2021  M  7900.00 A$18.24 16980.00 D  
Common Stock 1/11/2021  M  7900.00 A$14.80 24880.00 D  
Common Stock 1/11/2021  M  29162.00 A$8.16 54042.00 D  
Common Stock 1/11/2021  S(1)  7200.00 D$47.1656 (2)46842.00 D  
Common Stock 1/11/2021  S(1)  22830.00 D$47.8651 (3)24012.00 D  
Common Stock 1/11/2021  S(1)  2333.00 D$49.1564 (4)21679.00 D  
Common Stock 1/11/2021  S(1)  4400.00 D$50.3767 (5)17279.00 D  
Common Stock 1/11/2021  S(1)  8199.00 D$51.0821 (6)9080.00 (7)D  

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (Right to Buy) $18.24 1/11/2021  M     7900.00  12/31/2019 1/2/2029 Common Stock 7900.00 $0.00 0.00 D  
Stock Option (Right to Buy) $14.80 1/11/2021  M     7900.00  12/31/2018 8/7/2028 Common Stock 7900.00 $0.00 0.00 D  
Stock Option (right to buy) $8.16 1/11/2021  M     29162.00   (8)3/31/2027 Common Stock 29162.00 $0.00 1951.00 D  

Explanation of Responses:
(1) The sale of shares was effected pursuant to a Rule 10b5-1 trading plan adopted on December 9, 2020.
(2) This transaction was executed in multiple trades at prices ranging from $46.47 to $47.46. The price reported reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(3) This transaction was executed in multiple trades at prices ranging from $47.47 to $48.43. The price reported reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(4) This transaction was executed in multiple trades at prices ranging from $48.74 to $49.70. The price reported reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(5) This transaction was executed in multiple trades at prices ranging from $49.79 to $50.78. The price reported reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(6) This transaction was executed in multiple trades at prices ranging from $50.79 to $51.64. The price reported reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(7) Includes 2,270 restricted stock units.
(8) The option vests as to 25% of the shares on March 13, 2018 and vests as to an additional 2.083% of the shares per month thereafter until February 28, 2021.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
DEKKERS MARIJN E
C/O QUANTERIX CORPORATION,
900 MIDDLESEX TURNPIKE
BILLERICA, MA 01821
X



Signatures
/s/ Brian Keane, as Attorney-in-Fact1/13/2021
**Signature of Reporting PersonDate

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