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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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)
12/11/2017
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 12/11/2017 C 398,257 A (1) 398,257 D(2)
Common Stock 12/11/2017 C 1,045,426 A (1) 1,443,683 D(2)
Common Stock 12/11/2017 C 477,042 A (1) 1,920,725 D(2)
Common Stock 12/11/2017 C 109,769 A (1) 2,030,494 D(2)
Common Stock 12/11/2017 C 381,507 A (1) 2,412,001 D(2)
Common Stock 12/11/2017 C 1,271,684 A (1) 1,271,684 D(3)
Common Stock 12/11/2017 P 266,000(4) A $15 1,537,684 D(3)
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
Series A-1 Preferred Stock (1) 12/11/2017 C 1,280,000 (5) (6) Common Stock 398,257 (1) 0 D(2)
Series A-2 Preferred Stock (1) 12/11/2017 C 3,360,000 (5) (6) Common Stock 1,045,426 (1) 0 D(2)
Series B Preferred Stock (1) 12/11/2017 C 1,533,214 (5) (6) Common Stock 477,042 (1) 0 D(2)
Series C Preferred Stock (1) 12/11/2017 C 352,800 (5) (6) Common Stock 109,769 (1) 0 D(2)
Series D Preferred Stock (1) 12/11/2017 C 1,226,158 (5) (6) Common Stock 381,507 (1) 0 D(2)
Series D Preferred Stock (1) 12/11/2017 C 4,087,193 (5) (6) Common Stock 1,271,684 (1) 0 D(3)
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 60631

(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 60631

(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 60631

(City) (State) (Zip)
1. Name and Address of Reporting Person*
BYBEE CLINTON

(Last) (First) (Middle)
8755 WEST HIGGINS ROAD, SUITE 1025

(Street)
CHICAGO IL 60631

(City) (State) (Zip)
1. Name and Address of Reporting Person*
NELSEN ROBERT

(Last) (First) (Middle)
8755 WEST HIGGINS ROAD, SUITE 1025

(Street)
CHICAGO IL 60631

(City) (State) (Zip)
Explanation of Responses:
1. The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.
2. The shares are held of record by ARCH Venture Fund VI, L.P. ("ARCH Fund VI"). The sole general partner of ARCH Fund VI is ARCH Venture Partners VI, L.P. ("ARCH Partners VI"), which may be deemed to beneficially own the shares held by ARCH Fund VI. The sole general partner of ARCH Partners VI is ARCH Venture Partners VI, LLC ("ARCH VI LLC"), which may be deemed to beneficially own the shares held by ARCH Fund VI. ARCH Partners VI and ARCH VI LLC disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein. As a managing director of ARCH VI LLC, the Reporting Person may be deemed to beneficially own the shares held by ARCH Fund VI. The Reporting Person disclaims beneficial ownership of such shares, except to the extent of any pecuniary interest therein.
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 a managing director of ARCH VIII LLC, the Reporting Person may be deemed to beneficially own the shares held by ARCH Fund Overage. The Reporting Person disclaims beneficial ownership of such shares, except to the extent of any pecuniary interest therein.
4. Reflects shares purchased in the Issuer's initial public offering.
5. These shares were convertible into the Issuer's common stock in accordance with the Issuer's Restated Certificate of Incorporation, as amended, at any time after the issuance of such shares, at the holder's election.
6. Not applicable.
/s/ Mark McDonnell, as Attorney-in-Fact for ARCH Venture Fund VI, L.P. 12/11/2017
/s/ Mark McDonnell, as Attorney-in-Fact for ARCH Venture Fund VIII Overage, L.P. 12/11/2017
/s/ Mark McDonnell, as Attorney-in-Fact for ARCH Venture Partners VI, L.P. 12/11/2017
/s/ Mark McDonnell, as Attorney-in-Fact for ARCH Venture Partners VI, LLC 12/11/2017
/s/ Mark McDonnell, as Attorney-in-Fact for ARCH Venture Partners VIII, LLC 12/11/2017
/s/ Mark McDonnell, as Attorney-in-Fact for Clinton Bybee 12/11/2017
/s/ Mark McDonnell, as Attorney-in-Fact for Robert Nelsen 12/11/2017
** 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).
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