Quanterix (QTRX) director receives 1,215 shares as board fee stock

Rhea-AI Filing Summary

Quanterix Corporation director David R. Walt received 1,215 shares of common stock on 01/02/2026, reported at a price of $0.00 per share. According to the filing, this stock was granted in lieu of cash fees for his service on the company’s Board of Directors and its committees for the fourth quarter of 2025.

After this grant, Walt beneficially owned 1,872,890 shares of Quanterix common stock, held directly. The transaction was reported on a Form 4 as an acquisition of non-derivative securities.

Insider Trade Summary

Net Buyer: 1,215 shares

Net Buy 1 txn

Insider WALT DAVID R

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	1,215	$0.00	$0.00

Holdings After Transaction: Common Stock — 1,872,890 shares (Direct)

Footnotes (1)

1. F1. Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the fourth quarter of 2025.

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 01/06/2026 - 08:11 PM Learn about SEC filing dates

FAQ

What insider transaction did Quanterix (QTRX) report for David R. Walt?

Quanterix reported that director David R. Walt acquired 1,215 shares of its common stock on 01/02/2026. The acquisition was reported on a Form 4 as an award of non-derivative common stock.

At what price were the new Quanterix (QTRX) shares granted to the director?

The 1,215 shares of Quanterix common stock granted to director David R. Walt were reported at a price of $0.00 per share, indicating they were issued as compensation rather than purchased for cash.

Why did Quanterix grant 1,215 shares to its director instead of cash?

The filing states that the 1,215-share grant to director David R. Walt consists of stock granted in lieu of cash fees for his service on the company’s Board of Directors and its committees for the fourth quarter of 2025.

How many Quanterix (QTRX) shares does David R. Walt own after this Form 4 transaction?

Following the reported transaction, director David R. Walt beneficially owned 1,872,890 shares of Quanterix common stock, held in direct ownership.

What type of security was involved in David R. Walt’s Quanterix transaction?

The transaction involved non-derivative Quanterix common stock, reported in Table I of the Form 4 as an acquisition of shares.

Was this Quanterix (QTRX) insider transaction part of a Rule 10b5-1 trading plan?

The form includes a checkbox for transactions made under a Rule 10b5-1(c) trading plan, but the provided content does not indicate that this particular grant was made pursuant to such a plan.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

WALT DAVID R

(Last) (First) (Middle)

C/O QUANTERIX CORPORATION,

900 MIDDLESEX TURNPIKE

(Street)

BILLERICA MA 01821

(City) (State) (Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
01/02/2026

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

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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	01/02/2026		A		1,215(1)	A	$0.00	1,872,890	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the fourth quarter of 2025.

Remarks:

	/s/ Bonnie McManus, Attorney-in-Fact	01/06/2026
	** 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 4 (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.