[Form 4] Quanterix Corporation Insider Trading Activity

Rhea-AI Filing Summary

Form 4 overview: On 07/10/2025, director Matthew Winkler reported the automatic disposition of 984,513 Akoya Biosciences (AKYA) common shares on 07/08/2025 under transaction code J. The shares were converted pursuant to the Amended and Restated Agreement and Plan of Merger dated 04/28/2025, whereby Akoya merged with a wholly owned subsidiary of Quanterix Corporation and became its wholly owned subsidiary.

Under the merger terms, each Akoya share was exchanged for 0.1461 Quanterix share plus $0.38 in cash, subject to potential adjustment. Following the closing, Winkler now reports zero AKYA shares beneficially owned.

The filing also discloses the cancellation of 153,731 stock options with strike prices between $2.01 and $21.95 that were at or above the per-share merger consideration; these options were terminated for no consideration.

No open-market trades, pricing data, or new financial metrics are included—this is a procedural disclosure linked solely to the completed merger.

Positive

• Merger consideration disclosed: Each AKYA share converts into 0.1461 Quanterix share plus $0.38 cash, providing shareholders with liquidity and ongoing equity exposure.

Negative

• 153,731 stock options cancelled: All outstanding options held by the director were terminated for no consideration because their exercise prices exceeded the merger value.

Insights

Securities Analyst

TL;DR: Administrative Form 4 records conversion of Akoya shares to Quanterix stock and cash; no incremental valuation signal.

The filing confirms the 07/08/2025 close of the Quanterix–Akoya merger and documents director Matthew Winkler’s disposition of 984,513 AKYA shares. The exchange ratio (0.1461 QTRX + $0.38) matches the previously disclosed agreement, so investors learn nothing new about deal economics. All 153,731 stock options were cancelled because their exercise prices exceeded the merger consideration, preventing dilution. The disclosure is routine and should have minimal market impact.

Corporate Governance Expert

TL;DR: Filing evidences completion of merger and tidy-up of insider holdings; governance impact neutral.

This Form 4 complies with Section 16 requirements during a change-of-control event. Using code J clarifies the involuntary nature of the share conversion and option cancellation. Eliminating out-of-the-money options for no consideration avoids excessive insider payouts and aligns compensation with post-merger realities. Overall, the governance signal is neutral—proper disclosure, no unusual benefits, and no remaining insider stake in the now-private subsidiary.

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
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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^*

LAI GOLDMAN MYLA

(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)
07/08/2025

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	07/08/2025		A		2,940	A	(1)	2,940	D
Common Stock	07/08/2025		A		24,464(2)	A	$0.00	27,404(3)	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
Stock Option (right to buy)	$6.54	07/08/2025		A		50,758		(4)	07/08/2035	Common Stock	50,578	$0.00	50,758	D

Explanation of Responses:

1. Received in exchange for 20,000 shares of Akoya Biosciences, Inc. ("Akoya") common stock in connection with the acquisition of Akoya by Quanterix on July 8, 2025. Dr. Lai-Goldman received: (a) 0.1470 of a share of Quanterix common stock and (b) $0.37 in cash, for each share of Akoya common stock. The closing price of the Quanterix common stock on July 8, 2025 was $6.54 per share. The closing price of the Akoya common stock on July 7, 2025 was $1.29 per share.

2. Represents shares of stock issuable on vesting of restricted stock units. The restricted stock units vest as to one-third of the shares on each of July 8, 2026, July 8, 2027 and July 8, 2028.

3. Includes 24,464 restricted stock units.

4. The option vests as to one-third of the shares on July 8, 2026, and the remaining two-thirds of the shares vest monthly thereafter over two years in 24 successive equal installments.

Remarks:

	/s/ Brian Keane, as Attorney-in-Fact	07/10/2025
	** 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.

FAQ

What did Matthew Winkler report in the 07/10/2025 Form 4 for Akoya Biosciences (AKYA)?

He disclosed the disposition of 984,513 common shares and the cancellation of 153,731 stock options in connection with the Quanterix merger.

How much will Akoya Biosciences shareholders receive per share after the Quanterix merger?

Each share converts to 0.1461 Quanterix common share plus $0.38 in cash, subject to potential adjustment under the merger agreement.

Why were Matthew Winkler’s Akoya stock options cancelled?

Options with strike prices from $2.01 to $21.95 were automatically terminated because they equaled or exceeded the per-share merger consideration.

Does Matthew Winkler still own Akoya Biosciences shares after the merger?

No. The Form 4 shows zero AKYA shares beneficially owned following the conversion on 07/08/2025.

What does transaction code J signify in this Form 4?

Code J denotes a non-open-market disposition such as a merger, tender offer, or exchange agreement.