Shawn Stetson - May 11, 2021 Form 4 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: 4
Date filed: 5/13/2021, 05:32 PM

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	QTRX	Common Stock	Award	$0	+1.42K	+43.27%	$0.00	4.71K	May 11, 2021	Direct	F1, F2

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
transaction	QTRX	Stock Options (Right to buy)	Award	$0	+3.32K		$0.00	3.32K	May 11, 2021	Common Stock	3.32K	$49.20	Direct	F3

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

Explanation of Responses:

Id	Content
F1	Represents shares of stock issuable on vesting of restricted stock units. The restricted stock units vest as to 25% of the shares on May 11, 2022, and the remaining 75% vest in 36 equal monthly installments at the end of each month beginning on May 31, 2022.
F2	Includes 3,644 restricted stock units.
F3	The option vests as to 25% of the shares on May 11, 2022, and the remaining 75% vests in 36 equal monthly installments at the end of each month beginning on May 31, 2022.