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: Flagship Ventures Fund 2004 L P (10% Owner)
Reporting Person: Flagship Ventures General Partner LLC (10% Owner)
Reporting Person: AFEYAN NOUBAR (10% Owner)
Reporting Person: KANIA EDWIN M JR (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	109770	—	Acquired	2030495	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 (109770)	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: Held by Flagship Ventures Fund 2004, L.P. Flagship Ventures General Partner LLC (the "GP") is the General Partner of Flagship Ventures Fund 2004, L.P. Noubar B. Afeyan, Ph.D. and Edwin M. Kania, Jr. are the Managers of the GP. The GP, Dr. Afeyan and Mr. Kania may be deemed to possess voting and investment control over all shares held by Flagship Ventures Fund 2004, L.P. Each of the reporting persons disclaims beneficial ownership of the shares except to the extent of his or its pecuniary interest therein.

F3: 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.

F4: Not applicable.