QUANTERIX CORP

Ticker: QTRX CUSIP: 74766Q101 Class: Common Stock

NBC SECURITIES, INC.'s Holding History (CIK: 0000791540)

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

Q4 2025

Shares 179 Value ($000) $1 Avg Close $6.21 Range $4.50 - $7.88

Q3 2025

Shares 281 Value ($000) $2 Avg Close $5.32 Range $4.15 - $7.09

Q2 2025

Shares 294 Value ($000) $0 Avg Close $5.57 Range $4.05 - $7.03

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	179	$1	$6.21	$4.50 - $7.88
Q3 2025	281	$2	$5.32	$4.15 - $7.09
Q2 2025	294	$0	$5.57	$4.05 - $7.03