QUANTERIX CORP

Ticker: QTRX CUSIP: 74766Q101 Class: Common Stock

QUADRANT CAPITAL GROUP LLC's Holding History (CIK: 0001650717)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 961 Value ($000) $6 Avg Close $6.21 Range $4.50 - $7.88

Q4 2024

Shares 153 Value ($000) $2 Avg Close $12.16 Range $9.87 - $15.67

Q3 2024

Shares 110 Value ($000) $1 Avg Close $13.36 Range $10.50 - $16.74

Q4 2022

Shares 275 Value ($000) $4 Avg Close $11.51 Range $8.19 - $14.55

Q1 2021

Shares 9 Value ($000) $1 Avg Close $67.60 Range $42.92 - $92.57

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	961	$6	$6.21	$4.50 - $7.88
Q4 2024	153	$2	$12.16	$9.87 - $15.67
Q3 2024	110	$1	$13.36	$10.50 - $16.74
Q4 2022	275	$4	$11.51	$8.19 - $14.55
Q1 2021	9	$1	$67.60	$42.92 - $92.57