Quanterix Corp — Director's Dealing 2017

Dec 7, 2017

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: Quanterix Corp (QTRX)
CIK: 0001503274
Period of Report: 2017-12-06

Reporting Person: ARCH VENTURE FUND VI LP (10% Owner)
Reporting Person: ARCH Venture Fund VIII Overage, L.P. (10% Owner)
Reporting Person: ARCH VENTURE PARTNERS VI LP (10% Owner)
Reporting Person: ARCH VENTURE PARTNERS VI LLC (10% Owner)
Reporting Person: ARCH Venture Partners VIII, LLC (10% Owner)
Reporting Person: BYBEE CLINTON (10% Owner)
Reporting Person: NELSEN ROBERT (10% Owner)

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Series A-1 Preferred Stock	$		Common Stock (398257)		Direct
Series A-2 Preferred Stock	$		Common Stock (1045426)		Direct
Series B Preferred Stock	$		Common Stock (477042)		Direct
Series C Preferred Stock	$		Common Stock (109769)		Direct
Series D Preferred Stock	$		Common Stock (381507)		Direct
Series D Preferred Stock	$		Common Stock (1271684)		Direct

Footnotes

F1: These shares are 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.

F2: Not applicable.

F3: The shares of preferred stock will convert 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 will convert on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F4: 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 managing directors of ARCH VI LLC, Clinton Bybee and Robert Nelsen may be deemed to beneficially own the shares held by ARCH Fund VI. Messrs. Bybee and Nelsen disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein.

F5: 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, Clinton Bybee and Robert Nelsen may be deemed to beneficially own the shares held by ARCH Fund Overage. Messrs. Bybee and Nelsen disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein.