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Quanterix technology chief converts 1,558 stock awards

The chief technology officer's five RSU grants had 25% vest on the first anniversary and the remaining 75% in monthly installments.

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Form Type
4

Rhea-AI Filing Summary

Quanterix Corp Chief Technology Officer Michael Francis Miller reported restricted stock unit conversions into common stock on October 15, 2026. The five conversions covered 1,558 RSUs, which convert one-for-one into common shares. Separately, 467 shares were delivered or withheld for payment of exercise price or tax liability, at a reported $3.07 per share.

Insider Miller Michael Francis
Role Chief Technology Officer
Type Security Shares Price Value
Exercise Restricted Stock Unit F2 81 $0.00 $0.00
Exercise Restricted Stock Unit F3 136 $0.00 $0.00
Exercise Restricted Stock Unit F4 135 $0.00 $0.00
Exercise Restricted Stock Unit F5 372 $0.00 $0.00
Exercise Restricted Stock Unit F6 834 $0.00 $0.00
Exercise Common Stock F1 81 -- --
Exercise Price or Tax Liability Common Stock 25 $3.07 $76.75
Exercise Common Stock F1 136 -- --
Exercise Price or Tax Liability Common Stock 41 $3.07 $125.87
Exercise Common Stock F1 135 -- --
Exercise Price or Tax Liability Common Stock 41 $3.07 $125.87
Exercise Common Stock F1 372 -- --
Exercise Price or Tax Liability Common Stock 111 $3.07 $340.77
Exercise Common Stock F1 834 -- --
Exercise Price or Tax Liability Common Stock 249 $3.07 $764.43
Holdings After Transaction: Restricted Stock Unit — 33,675 contracts (Direct); Common Stock — 39,543 shares (Direct)
Footnotes (6)
  1. F1. Restricted stock units convert into common stock on a one-for-one basis.
  2. F2. On February 6, 2023, the reporting person was granted 3,929 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.
  3. F3. On March 15, 2023, the reporting person was granted 6,566 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.
  4. F4. On February 2, 2024, the reporting person was granted 6,494 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.
  5. F5. On May 21, 2024, the reporting person was granted 17,878 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.
  6. F6. On February 4, 2025, the reporting person was granted 40,036 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.
RSUs converted 1,558 shares Five conversions into common stock on October 15, 2026
Conversion ratio 1 common share per RSU Restricted stock units convert into common stock on a one-for-one basis
Shares delivered or withheld 467 shares For payment of exercise price or tax liability on October 15, 2026
Reported price per share $3.07 per share Shares delivered or withheld on October 15, 2026
First-anniversary vesting 25% RSU grant vesting schedule
Remaining RSU vesting 75% over 36 equal monthly installments Installments occur on the 15th day of each month after the first anniversary
restricted stock units financial
"Restricted stock units convert into common stock"
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
"convert into common stock on a one-for-one basis"
vesting financial
"vesting 25% on the first anniversary of the grant date"
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

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

How many QTRX shares did Michael Francis Miller receive and have withheld?

On October 15, 2026, Michael Francis Miller, Quanterix Corp's chief technology officer, reported RSU conversions representing 1,558 common shares and 467 shares delivered or withheld for payment of exercise price or tax liability, with the latter reported at $3.07 per share.

What was the vesting schedule for Michael Francis Miller's QTRX RSUs?

The grant notes state that 25% vested on the first anniversary of each grant date, with the remaining 75% vesting in 36 equal monthly installments on the 15th day of each month thereafter.

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

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Available on EDGAR Accepted by SEC EDGAR Learn about SEC filing dates
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*
Miller Michael Francis

(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Technology Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
10/15/2026
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 Stock10/15/2026M81A(1)38,533D
Common Stock10/15/2026F25D$3.0738,508D
Common Stock10/15/2026M136A(1)38,644D
Common Stock10/15/2026F41D$3.0738,603D
Common Stock10/15/2026M135A(1)38,738D
Common Stock10/15/2026F41D$3.0738,697D
Common Stock10/15/2026M372A(1)39,069D
Common Stock10/15/2026F111D$3.0738,958D
Common Stock10/15/2026M834A(1)39,792D
Common Stock10/15/2026F249D$3.0739,543D
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$0.0010/15/2026M81 (2) (2)Common Stock81$0.00355D
Restricted Stock Unit$0.0010/15/2026M136 (3) (3)Common Stock136$0.00709D
Restricted Stock Unit$0.0010/15/2026M135 (4) (4)Common Stock135$0.002,171D
Restricted Stock Unit$0.0010/15/2026M372 (5) (5)Common Stock372$0.007,085D
Restricted Stock Unit$0.0010/15/2026M834 (6) (6)Common Stock834$0.0023,355D
Explanation of Responses:
1. Restricted stock units convert into common stock on a one-for-one basis.
2. On February 6, 2023, the reporting person was granted 3,929 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.
3. On March 15, 2023, the reporting person was granted 6,566 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.
4. On February 2, 2024, the reporting person was granted 6,494 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.
5. On May 21, 2024, the reporting person was granted 17,878 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.
6. On February 4, 2025, the reporting person was granted 40,036 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.
Remarks:
/s/ Meghan Shevlin, Attorney-in-Fact10/16/2026
** 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)

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