Quanterix (QTRX) CLO Daniel Char granted RSUs and stock options

Rhea-AI Filing Summary

Quanterix Corp Chief Legal Officer Daniel Char has reported initial equity holdings. The filing shows grants received on January 15, 2026 of 33,962 restricted stock units tied to common stock and 113,171 stock options to buy common shares at an exercise price of $7.95 per share. Both awards vest 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments, creating a multi-year incentive structure aligned with continued service.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Char Daniel

(Last) (First) (Middle)

C/O QUANTERIX CORPORATION

900 MIDDLESEX TURNPIKE

(Street)

BILLERICA MASSACHUSETTS 01821

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
02/23/2026

3. Issuer Name and Ticker or Trading Symbol
Quanterix Corp [ QTRX ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Legal Officer

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Unit	(1)	(1)	Common Stock	33,962	$0.00	D
Stock Options (Right to buy)	(2)	01/15/2036	Common Stock	113,171	$7.95	D

Explanation of Responses:

1. On January 15, 2026, the reporting person was granted 33,962 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the 15th day of each month thereafter.

2. On January 15, 2026, the reporting person was granted 113,171 stock options, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the 15th day of each month thereafter.

Remarks:

	/s/ Bonnie McManus, Attorney-in-Fact	03/24/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

FAQ

What insider activity did Quanterix Corp (QTRX) report for Daniel Char?

Quanterix reported that Chief Legal Officer Daniel Char received equity awards consisting of 33,962 restricted stock units and 113,171 stock options on January 15, 2026. These positions represent his reported initial ownership on the Form 3 filing date.

How many restricted stock units does Daniel Char hold in Quanterix (QTRX)?

Daniel Char holds 33,962 restricted stock units linked to Quanterix common stock. These RSUs vest 25% after one year from the January 15, 2026 grant, with the remaining 75% vesting in 36 equal monthly installments thereafter.

What stock options were granted to Daniel Char at Quanterix (QTRX)?

Daniel Char was granted 113,171 stock options to purchase Quanterix common stock at an exercise price of $7.95 per share. The options vest 25% after one year from January 15, 2026, and the remaining 75% vest in 36 equal monthly installments.

When do Daniel Char’s Quanterix (QTRX) equity awards vest?

Both Daniel Char’s RSUs and stock options vest 25% on the first anniversary of the January 15, 2026 grant date. The remaining 75% vest in 36 equal monthly installments on the 15th day of each month afterward, encouraging long-term retention.

Are Daniel Char’s Quanterix (QTRX) holdings direct or indirect?

The Form 3 indicates Daniel Char’s 33,962 restricted stock units and 113,171 underlying option shares are held as direct interests. There is no reference in the filing to indirect ownership through entities or trusts for these specific awards.