Quanterix (QTRX) CFO Jason Faessler files initial Form 3 ownership

Rhea-AI Filing Summary

Quanterix Corp Chief Financial Officer Jason F. Faessler has filed an initial Form 3, which is the first statement of his beneficial ownership as an insider. The filing reports no transactions in Quanterix stock and no option exercises or other activity in this excerpt.

Key Figures

Buy transactions: 0 shares Sell transactions: 0 shares Option or derivative exercises: 0 shares

3 metrics

Buy transactions 0 shares BuyCount and BuyShares in transaction summary

Sell transactions 0 shares SellCount and SellShares in transaction summary

Option or derivative exercises 0 shares exerciseCount and exerciseShares in transaction summary

Key Terms

Form 3, reportingPersons, beneficial ownership

3 terms

Form 3 regulatory

"INSIDER FILING DATA (Form 3): {"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

reportingPersons regulatory

""reportingPersons": [ { "name": "Faessler Jason F.","

beneficial ownership financial

"initial statement of his beneficial ownership as an insider"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

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Available on EDGAR 06/22/2026 - 04:19 PM Accepted by SEC EDGAR 06/22/2026 - 04:18 PM Learn about SEC filing dates

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

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Faessler Jason F.

(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)
06/22/2026

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 Financial 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

Explanation of Responses:

Remarks:

No securities are beneficially owned.

	/s/ Meghan Shevlin, Attorney-in-Fact	06/22/2026
	** 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 does Jason F. Faessler's Form 3 for Quanterix (QTRX) show?

The Form 3 shows Jason F. Faessler, Quanterix’s Chief Financial Officer, as an insider reporting person. In this excerpt, it reports no stock purchases, sales, option exercises, gifts, or other equity transactions.

Did Quanterix (QTRX) CFO Jason F. Faessler buy or sell shares in this Form 3?

No, the Form 3 data show zero buy and zero sell transactions. The transaction summary lists no purchases, sales, exercises, gifts, tax withholdings, or restructurings for this initial ownership filing.

What is the purpose of this Quanterix (QTRX) Form 3 filing?

This Form 3 serves as Jason F. Faessler’s initial statement as a reporting person at Quanterix. It establishes his status as Chief Financial Officer subject to insider reporting rules, with no share transactions disclosed in this excerpt.

Are there any derivative securities reported for Quanterix (QTRX) CFO in this Form 3?

No derivative securities are listed in the derivative summary for this filing. The counts for derivative transactions and option or warrant exercises are all zero in the transaction summary provided.

Does the Quanterix (QTRX) Form 3 for Jason F. Faessler indicate gifts or tax withholding events?

No, the transaction summary shows zero gift transactions and zero tax-withholding dispositions. The filing excerpt indicates no such equity-related events for Jason F. Faessler at the time of this Form 3.