Vandana Sriram - 15 Feb 2026 Form 4 Insider Report for Quanterix Corp (QTRX)

Role
Chief Financial Officer
Signature
/s/ Bonnie McManus, as Attorney-in-Fact
Issuer symbol
QTRX
Transactions as of
15 Feb 2026
Net transactions value
-$1,556
Form type
4
Filing time
18 Feb 2026, 16:42:28 UTC
Previous filing
06 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Sriram Vandana Chief Financial Officer C/O QUANTERIX CORPORATION, 900 MIDDLESEX TURNPIKE, BILLERICA /s/ Bonnie McManus, as Attorney-in-Fact 18 Feb 2026 0001908223

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction QTRX Common Stock Options Exercise +514 +2% 26,248 15 Feb 2026 Direct F1, F2
transaction QTRX Common Stock Tax liability $1,027 -179 -0.68% $5.74 26,069 15 Feb 2026 Direct
transaction QTRX Common Stock Options Exercise +263 +1% 26,332 15 Feb 2026 Direct F1
transaction QTRX Common Stock Tax liability $528 -92 -0.35% $5.74 26,240 15 Feb 2026 Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction QTRX Performance Stock Unit Award $0 +74,905 $0.000000 74,905 15 Feb 2026 Common Stock 74,905 $0.000000 Direct F3
transaction QTRX Restricted Stock Unit Award $0 +74,905 $0.000000 74,905 15 Feb 2026 Common Stock 74,905 $0.000000 Direct F4
transaction QTRX Restricted Stock Unit Options Exercise $0 -263 -5.3% $0.000000 4,734 15 Feb 2026 Common Stock 263 $0.000000 Direct F5
transaction QTRX Restricted Stock Unit Options Exercise $0 -514 -4% $0.000000 12,339 15 Feb 2026 Common Stock 514 $0.000000 Direct F6
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Restricted stock units convert into common stock on a one-for-one basis.
F2 The total shown no longer includes 55,884 unvested RSUs which the reporting person previously reported in Table I of Form 4 and will hereafter report in Table II of Form 4.
F3 Each PSU award to vest (subject to the employee's continued service to the Company on the applicable vesting dates) according to the schedule and conditions set forth in the executive long-term incentive plan contained in the Company's 2026 Employee Equity Guidelines. After the award's performance conditions are satisfied, the PSUs will vest in four equal annual installments on each of the first four anniversaries of the Transaction Date.
F4 The award vests in four equal annual installments on each of the first four anniversaries of the Transaction Date.
F5 On August 21, 2023, the reporting person was granted 12,624 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in equal monthly installments of 6.25% on the monthly anniversary of the grant date thereafter.
F6 On February 2, 2024, the reporting person was granted 24,675 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in equal monthly installments of 6.25% on the monthly anniversary of the grant date thereafter.