Shawn Stetson - May 11, 2021 Form 3 Insider Report for Quanterix Corp (QTRX)

Role: Interim CFO and Treasurer
Signature: /s/ Brian Keane, as Attorney-in-Fact
Stock symbol: QTRX
Transactions as of: May 11, 2021
Transactions value $: $0
Form type: 3
Date filed: 5/13/2021, 05:32 PM

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	QTRX	Common Stock						3.29K	May 11, 2021	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	QTRX	Stock Options (Right to buy)							May 11, 2021	Common Stock	5K	$31.91	Direct	F2
holding	QTRX	Stock Options (Right to buy)							May 11, 2021	Common Stock	1.85K	$27.76	Direct	F3
holding	QTRX	Stock Options (Right to buy)							May 11, 2021	Common Stock	831	$79.48	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Includes 2,221 restricted stock units.
F2	The option vested as to 25% of the shares on July 27, 2020, and the remaining 75% vests in 36 equal monthly installments at the end of each month beginning on July 31, 2020.
F3	The option vested as to 25% of the shares on February 18, 2021, and the remaining 75% vests in 36 equal monthly installments at the end of each month beginning on February 28, 2021.
F4	The option vests as to 25% of the shares on February 10, 2022, and the remaining 75% vests in 36 equal monthly installments at the end of each month beginning on February 28, 2022.