Quanterix director converts 3,955 RSUs to shares

Quanterix Corp (QTRX) director Jeffrey Thomas Elliott reported an exercise and conversion of restricted stock units (RSUs) into common stock.

Rhea-AI Filing Summary

Quanterix Corp (QTRX) director Jeffrey Thomas Elliott reported an exercise and conversion of restricted stock units (RSUs) into common stock. On August 19, 2026, 3,955 RSUs were converted into 3,955 shares of common stock on a one-for-one basis. Following the transactions, Elliott directly held 15,345 shares of common stock and 4,075 RSUs. The RSUs relate to a prior grant of 11,985 RSUs, vesting 33%, 33%, and 34% on the first, second, and third anniversaries of the August 19, 2024 grant date, respectively.

Insider Trade Summary

3,955 shares exercised/converted

Exercise 2 txns

Insider Elliott Jeffrey Thomas

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit F2	3,955	$0.00	$0.00
Exercise	Common Stock F1	3,955	--	--

Holdings After Transaction: Restricted Stock Unit — 4,075 contracts (Direct); Common Stock — 15,345 shares (Direct)

Footnotes (2)

1. F1. Restricted stock units convert into common stock on a one-for-one basis.
2. F2. On August 19, 2024, the reporting person was granted 11,985 restricted stock units, vesting 33%, 33%, and 34% on the first, second, and third anniversaries of the grant date, respectively.

Key Figures

Restricted stock units converted: 3,955 units Common stock holdings after transaction: 15,345 shares Restricted stock units remaining: 4,075 units +2 more

5 metrics

Restricted stock units converted 3,955 units RSUs converted into common stock on August 19, 2026

Common stock holdings after transaction 15,345 shares Direct ownership after RSU conversion

Restricted stock units remaining 4,075 units Direct RSU balance following the reported transactions

Original RSU grant size 11,985 units RSUs granted on August 19, 2024

RSU vesting schedule 33%, 33%, 34% Vesting on first, second, and third anniversaries of August 19, 2024 grant date

Key Terms

Restricted stock unit, derivative security, Exercise or conversion of derivative security

3 terms

Restricted stock unit financial

"Restricted stock units convert into common stock on a one-for-one basis"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

derivative security financial

"transaction_code_description": "Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

Exercise or conversion of derivative security financial

"transaction_code_description": "Exercise or conversion of derivative security"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Quanterix Corp (QTRX) report for Jeffrey Thomas Elliott?

Jeffrey Thomas Elliott reported exercising 3,955 restricted stock units into 3,955 shares of common stock on August 19, 2026. The transaction was reported as an exercise or conversion of a derivative security rather than an open-market purchase or sale.

How many Quanterix (QTRX) common shares does Jeffrey Thomas Elliott hold after this Form 4?

After the reported transactions, Jeffrey Thomas Elliott directly held 15,345 shares of Quanterix common stock. This reflects the addition of 3,955 shares received from the conversion of restricted stock units on August 19, 2026.

How many restricted stock units does the Quanterix (QTRX) director still hold?

Following the transactions, Jeffrey Thomas Elliott held 4,075 restricted stock units. These RSUs are part of an earlier grant that converts into common stock on a one-for-one basis as vesting occurs.

What was the size and vesting schedule of the Quanterix (QTRX) RSU grant to Jeffrey Thomas Elliott?

On August 19, 2024, Jeffrey Thomas Elliott was granted 11,985 restricted stock units. The RSUs vest 33% on the first anniversary, 33% on the second anniversary, and 34% on the third anniversary of the grant date.

Was Jeffrey Thomas Elliott’s Quanterix (QTRX) Form 4 transaction under a Rule 10b5-1 plan?

The filing indicates the Rule 10b5-1 checkbox was not affirmed (false). There is no footnote stating that the transactions were made pursuant to a Rule 10b5-1 trading plan.

Did Jeffrey Thomas Elliott buy or sell Quanterix (QTRX) shares on the open market?

No open-market purchases or sales are reported. The Form 4 shows an exercise or conversion of 3,955 restricted stock units into common stock and the corresponding derivative reduction, not a market trade.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/20/2026 - 05:01 PM Accepted by SEC EDGAR 08/20/2026 - 04:59 PM Learn about SEC filing dates

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^*

Elliott Jeffrey Thomas

(Last) (First) (Middle)

C/O QUANTERIX CORPORATION

900 MIDDLESEX TURNPIKE

(Street)

BILLERICA MASSACHUSETTS 01821

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/19/2026

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

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

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

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	08/19/2026		M		3,955	A	(1)	15,345	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
Restricted Stock Unit	$0.00	08/19/2026		M			3,955	(2)	(2)	Common Stock	3,955	$0.00	4,075	D

Explanation of Responses:

1. Restricted stock units convert into common stock on a one-for-one basis.

2. On August 19, 2024, the reporting person was granted 11,985 restricted stock units, vesting 33%, 33%, and 34% on the first, second, and third anniversaries of the grant date, respectively.

Remarks:

	/s/ Meghan Shevlin, Attorney-in-Fact	08/20/2026
	** 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.
* Form 4: SEC 1474 (03-26)