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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1503274	Quanterix Corp	QTRX	()	4/A

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1216068	E Marijn Dekkers	C/O Quanterix Corporation, 113 Hartwell Avenue Lexington MA 02421		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2017-12-11	77,378	$0.00	77,378	No	4	C	Direct
Common Stock	Acquisiton	2017-12-11	40,000	$15.00	117,378	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Direct
No	4	P	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series D-1 Preferred Stock	Disposition	2017-12-11	248,694	$0.00	77,378	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Direct

Footnotes

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.
Reflects shares of common stock purchased in the Issuer's initial public offering. This amendment is being filed solely to report this purchase of shares of common stock, which was inadvertently omitted from the Form 4 filed on December 11, 2017.
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.
Not applicable.