Quanterix Corp — Director's Dealing 2017

Dec 13, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Quanterix Corp (QTRX)
CIK: 0001503274
Period of Report: 2017-12-11

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)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-12-11	Common Stock	C	398257	—	Acquired	398257	Direct
2017-12-11	Common Stock	C	1045426	—	Acquired	1443683	Direct
2017-12-11	Common Stock	C	477042	—	Acquired	1920725	Direct
2017-12-11	Common Stock	C	109769	—	Acquired	2030494	Direct
2017-12-11	Common Stock	C	381507	—	Acquired	2412001	Direct
2017-12-11	Common Stock	C	1271684	—	Acquired	1271684	Direct
2017-12-11	Common Stock	P	266000	$15.00	Acquired	1537684	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-12-11	Series A-1 Preferred Stock	$	C	1280000	Disposed		Common Stock (398257)	Direct
2017-12-11	Series A-2 Preferred Stock	$	C	3360000	Disposed		Common Stock (1045426)	Direct
2017-12-11	Series B Preferred Stock	$	C	1533214	Disposed		Common Stock (477042)	Direct
2017-12-11	Series C Preferred Stock	$	C	352800	Disposed		Common Stock (109769)	Direct
2017-12-11	Series D Preferred Stock	$	C	1226158	Disposed		Common Stock (381507)	Direct
2017-12-11	Series D Preferred Stock	$	C	4087193	Disposed		Common Stock (1271684)	Direct

Footnotes

F1: 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.

F2: 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.

F3: 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.

F4: Reflects shares purchased in the Issuer's initial public offering.

F5: 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.

F6: Not applicable.