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Director Scott Mendel converts 8,073 RSUs at Quanterix (NASDAQ: QTRX)

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Quanterix Corp director Scott Mendel reported an equity compensation event. On July 8, 2026, he converted 8,073 restricted stock units into an equal number of common shares at no cost, reflecting routine vesting. After this conversion, he directly holds 24,056 common shares and 16,391 restricted stock units. The RSUs relate to a 24,464-unit grant made on July 8, 2025, which vests 33%, 33%, and 34% on the first three anniversaries of the grant date.

Positive

  • None.

Negative

  • None.
Insider Mendel Scott
Role null
Type Security Shares Price Value
Exercise Restricted Stock Unit 8,073 $0.00 --
Exercise Common Stock 8,073 $0.00 --
Holdings After Transaction: Restricted Stock Unit — 16,391 shares (Direct, null); Common Stock — 24,056 shares (Direct, null)
Footnotes (1)
  1. Restricted stock units convert into common stock on a one-for-one basis. On July 8, 2025, the reporting person was granted 24,464 restricted stock units, vesting 33%, 33%, and 34% on the first, second, and third anniversaries of the grant date, respectively.
RSUs converted 8,073 shares Restricted stock units converted to common stock on July 8, 2026
Common shares after transaction 24,056 shares Direct Quanterix common stock holdings following RSU conversion
Remaining RSUs 16,391 units Restricted stock units outstanding after 8,073-unit conversion
Original RSU grant size 24,464 units RSUs granted on July 8, 2025
RSU vesting schedule 33%, 33%, 34% Vesting on first, second, and third anniversaries of July 8, 2025
Conversion ratio 1:1 Restricted stock units convert into common stock on a one-for-one basis
Restricted stock units financial
"On July 8, 2025, the reporting person was granted 24,464 restricted stock units, vesting 33%, 33%, and 34%..."
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
one-for-one basis financial
"Restricted stock units convert into common stock on a one-for-one basis."
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.
Form 4 regulatory
"INSIDER FILING DATA (Form 4): { "issuerName": "Quanterix Corp"..."
Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.
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FAQ

What did Quanterix (QTRX) director Scott Mendel report in this Form 4 filing?

Scott Mendel reported a routine equity compensation event, converting 8,073 restricted stock units into common stock at no cost. Following this transaction, he directly owns 24,056 Quanterix common shares and continues to hold 16,391 restricted stock units from an earlier grant.

How many Quanterix (QTRX) shares does Scott Mendel hold after the reported transaction?

After the transaction, Scott Mendel directly holds 24,056 Quanterix common shares. In addition, he still has 16,391 restricted stock units outstanding, which represent future potential share deliveries subject to the vesting schedule from his 2025 equity award.

What exactly happened to Scott Mendel’s restricted stock units in this Quanterix (QTRX) Form 4?

Mendel converted 8,073 restricted stock units into an equal number of Quanterix common shares on a one-for-one basis at a price of $0 per share. This reflects vesting of part of his prior RSU grant awarded as compensation.

What is the size and vesting schedule of Scott Mendel’s 2025 Quanterix (QTRX) RSU grant?

On July 8, 2025, Mendel received a grant of 24,464 restricted stock units from Quanterix. The award vests in three tranches: 33% on the first anniversary, 33% on the second anniversary, and 34% on the third anniversary of the grant date.

How many restricted stock units remain for Scott Mendel after this Quanterix (QTRX) transaction?

After converting 8,073 restricted stock units into common shares, Scott Mendel has 16,391 restricted stock units remaining. These RSUs are tied to his 2025 grant and will continue vesting according to the specified multi-year vesting schedule.
SEC Form 4
FORM 4UNITED 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*
Mendel Scott

(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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
07/08/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock07/08/2026M8,073A(1)24,056D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Unit$0.0007/08/2026M8,073 (2) (2)Common Stock8,073$0.0016,391D
Explanation of Responses:
1. Restricted stock units convert into common stock on a one-for-one basis.
2. On July 8, 2025, the reporting person was granted 24,464 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-Fact07/09/2026
** Signature of Reporting PersonDate
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)