Everett Cunningham - 19 Jan 2026 Form 4 Insider Report for Quanterix Corp (QTRX)

Role: President and CEO, Director
Signature: /s/ Daniel Char, Attorney-in-Fact
Issuer symbol: QTRX
Transactions as of: 19 Jan 2026
Net transactions value: $0
Form type: 4
Filing time: 21 Jan 2026, 16:15:00 UTC
Previous filing: 08 Jul 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Cunningham Everett	President and CEO, Director	C/O QUANTERIX CORPORATION, 900 MIDDLESEX TURNPIKE, BILLERICA	/s/ Daniel Char, Attorney-in-Fact	20 Jan 2026	0001564777

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	Performance-Based Restricted Stock Units	Award	$0	+813,750		$0.000000	813,750	19 Jan 2026	Common Stock	813,750		Direct	F1
transaction	QTRX	Time-Based Restricted Stock Units	Award	$0	+1,070,000	+131%	$0.000000	1,883,750	19 Jan 2026	Common Stock	1,070,000		Direct	F2

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

Explanation of Responses:

Id	Content
F1	Each performance-based restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock. The performance-based RSUs vest upon the volume-weighted average price of the Issuer's common stock meeting certain thresholds within a four-year period, except as provided for under Section 8(y) of the Employment Agreement by and between the Issuer and the Reporting Person dated January 8, 2026.
F2	Each time-based RSU represents a contingent right to receive one share of the Issuer's common stock. The time-based RSUs vest as to one-fourth of the total number of shares on each of January 19, 2027, January 19, 2028, January 19, 2029 and January 19, 2030, except as provided for under Section 8(d) or 8(y) of the Employment Agreement by and between the Issuer and the Reporting Person dated January 8, 2026.

Content

Each performance-based restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock. The performance-based RSUs vest upon the volume-weighted average price of the Issuer's common stock meeting certain thresholds within a four-year period, except as provided for under Section 8(y) of the Employment Agreement by and between the Issuer and the Reporting Person dated January 8, 2026.

Each time-based RSU represents a contingent right to receive one share of the Issuer's common stock. The time-based RSUs vest as to one-fourth of the total number of shares on each of January 19, 2027, January 19, 2028, January 19, 2029 and January 19, 2030, except as provided for under Section 8(d) or 8(y) of the Employment Agreement by and between the Issuer and the Reporting Person dated January 8, 2026.