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SEC FORM 4 SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 		 
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X
 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
ARCH VENTURE FUND VI LP
(Last) (First) (Middle)
8755 WEST HIGGINS ROAD, SUITE 1025
(Street)
CHICAGO IL 60631
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Quanterix Corp [ QTRX ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director X 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
11/20/2020
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
X 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. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 11/20/2020 J(1) 229,006 D $0 2,182,995 I See Footnote(2)
Common Stock 11/20/2020 J(1) 145,994 D $0 1,391,690 I See Footnote(3)
Common Stock 11/20/2020 J(1)(4) 854 A $0 854 D(5)
Common Stock 11/20/2020 J(1)(4) 853 A $0 853 D(6)
Common Stock 11/24/2020 J(1) 277,514 D $0 1,905,481 I See Footnote(2)
Common Stock 11/24/2020 J(1) 176,920 D $0 1,214,770 I See Footnote(3)
Common Stock 11/24/2020 J(1)(4) 1,034 A $0 1,888 D(5)
Common Stock 11/24/2020 J(1)(4) 1,036 A $0 1,889 D(6)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. 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: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
1. Name and Address of Reporting Person*
ARCH VENTURE FUND VI LP
(Last) (First) (Middle)
8755 WEST HIGGINS ROAD, SUITE 1025
(Street)
CHICAGO IL 60631
(City) (State) (Zip)
1. Name and Address of Reporting Person*
ARCH Venture Fund VIII Overage, L.P.
(Last) (First) (Middle)
8755 WEST HIGGINS ROAD, SUITE 1025
(Street)
CHICAGO IL 60631
(City) (State) (Zip)
1. Name and Address of Reporting Person*
ARCH VENTURE PARTNERS VI LP
(Last) (First) (Middle)
8755 WEST HIGGINS ROAD, SUITE 1025
(Street)
CHICAGO IL 606031
(City) (State) (Zip)
1. Name and Address of Reporting Person*
ARCH VENTURE PARTNERS VI LLC
(Last) (First) (Middle)
8755 WEST HIGGINS ROAD, SUITE 1025
(Street)
CHICAGO IL 606031
(City) (State) (Zip)
1. Name and Address of Reporting Person*
ARCH Venture Partners VIII, LLC
(Last) (First) (Middle)
8755 WEST HIGGINS ROAD, SUITE 1025
(Street)
CHICAGO IL 606031
(City) (State) (Zip)
1. Name and Address of Reporting Person*
BYBEE CLINTON
(Last) (First) (Middle)
C/O ARCH VENTURE PARTNERS IX, LLC
8755 W. HIGGINS ROAD, SUITE 1025
(Street)
CHICAGO IL 60631
(City) (State) (Zip)
1. Name and Address of Reporting Person*
NELSEN ROBERT
(Last) (First) (Middle)
8755 W. HIGGINS ROAD, SUITE 1025
(Street)
CHICAGO IL 60631
(City) (State) (Zip)
Explanation of Responses:
1. Distribution of Common Stock held by a limited partnership to its partners for no consideration.
2. These shares are directly held by ARCH Venture Fund VI, L.P. ("ARCH VI"). ARCH Venture Partners VI, L.P. ("GPLP"), the sole general partner of ARCH VI, may be deemed to beneficially own the shares held by ARCH VI. ARCH Venture Partners VI, LLC ("GPLLC"), as the sole general partner of GPLP, may be deemed to beneficially own the shares held by ARCH VI. As managing directors of GPLLC, each of Robert Nelsen and Clinton Bybee (the "ARCH Managing Directors"), may be deemed to beneficially own the shares held by ARCH VI. Each of GPLP, GPLLC and the ARCH Managing Directors disclaims beneficial ownership of the securities reported herein, except to the extent of their pecuniary interest therein, if any.
3. The shares are held of record by ARCH Venture Fund VIII Overage, L.P. ("ARCH Fund Overage"). The sole general partner of ARCH Fund Overage is ARCH Venture Partners VIII, LLC ("ARCH VIII LLC"), which may be deemed to beneficially own the shares held by ARCH Fund Overage. ARCH VIII LLC disclaims beneficial ownership of such shares, except to the extent of any pecuniary interest therein. As managing directors of ARCH VIII LLC, each of the ARCH Managing Directors may be deemed to beneficially own the shares held by ARCH Overage. Each of ARCH VIII LLC and the ARCH Managing Directors disclaims beneficial ownership of the securities reported herein, except to the extent of their pecuniary interest therein, if any.
4. Change from indirect to direct ownership of shares previously reported as beneficially owned by the Reporting Person.
5. Shares owned by Nelsen.
6. Shares owned by Bybee.
/s/ Mark McDonnell, as Attorney-in-Fact for ARCH Venture Fund VI, L.P. 11/24/2020
/s/ Mark McDonnell, as Attorney-in-Fact for ARCH Venture Fund VIII Overage, L.P. 11/24/2020
/s/ Mark McDonnell, as Attorney-in-Fact for ARCH Venture Partners VI, L.P. 11/24/2020
/s/ Mark McDonnell, as Attorney-in-Fact for ARCH Venture Partners VI, LLC 11/24/2020
/s/ Mark McDonnell, as Attorney-in-Fact for ARCH Venture Partners VIII, LLC 11/24/2020
/s/ Mark McDonnell, as Attorney-in-Fact for Clinton Bybee 11/24/2020
/s/ Mark McDonnell, as Attorney-in-Fact for Robert Nelsen 11/24/2020
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
POWER OF ATTORNEY

	KNOW ALL MEN BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints Mark McDonnell his true and
lawful attorney-in-fact, with full power of substitution, to sign any and
all instruments, certificates and documents that may be necessary, desirable
or appropriate to be executed on behalf of himself as an individual or in
his capacity as a direct or indirect general partner, director, officer or
manager of any partnership, corporation or limited liability company, pursuant
to section 13 or 16 of the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), and any and all regulations promulgated thereunder, and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission, and with any other
entity when and if such is mandated by the Exchange Act or by the Financial
Industry Regulatory Authority, granting unto said attorney-in-fact full power
and authority to do and perform each and every act and thing necessary,
desirable or appropriate, fully to all intents and purposes as he might or could
do in person, thereby ratifying and confirming all that said attorney-in-fact,
or his substitutes, may lawfully do or cause to be done by virtue hereof.


IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
10th day of November, 2010.

	ARCH VENTURE FUND VI, L.P.

	By:   ARCH Venture Partners VI, L.P.
	its General Partner

	By:  ARCH Venture Partners VI, LLC
	its General Partner

	By:  /s/ Keith Crandell
	Managing Director


	ARCH VENTURE PARTNERS VI, L.P.

	By:  ARCH Venture Partners VI, LLC
	its General Partner

	By:  /s/ Keith Crandell
	Managing Director


	ARCH VENTURE PARTNERS VI, LLC

	By:  /s/ Keith Crandell
	Managing Director


	/s/ Keith Crandell
	Keith Crandell


	/s/ Robert Neslon
	Robert Nelsen


	/s/ Clinton Bybee
	Clinton Bybee

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints Mark McDonnell his true and
lawful attorney-in-fact, with full power of substitution, to sign any and
all instruments, certificates and documents that may be necessary, desirable
or appropriate to be executed on behalf of himself as an individual or in
his capacity as a direct or indirect general partner, director, officer or
manager of any partnership, corporation or limited liability company, pursuant
to section 13 or 16 of the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), and any and all regulations promulgated thereunder, and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission, and with any other
entity when and if such is mandated by the Exchange Act or by the Financial
Industry Regulatory Authority, granting unto said attorney-in-fact full power
and authority to do and perform each and every act and thing necessary,
desirable or appropriate, fully to all intents and purposes as he might or could
do in person, thereby ratifying and confirming all that said attorney-in-fact,
or his substitutes, may lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
26th day of July, 2017.

ARCH VENTURE FUND VIII OVERAGE, L.P.

By: ARCH Venture Partners VIII, LLC
its General Partner

By: /s/ Keith Crandell
Managing Director

ARCH VENTURE PARTNERS VIII, L.P.

By:  ARCH Venture Partners VIII, LLC
its General Partner

By: /s/ Keith Crandell
Managing Director