QUANTERIX CORP

Ticker: QTRX CUSIP: 74766Q101 Class: Common Stock

PRINCIPAL SECURITIES, INC.'s Holding History (CIK: 0000012600)

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

Q2 2025

Shares 60 Value ($000) $0 Avg Close $5.57 Range $4.05 - $7.03

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2025	60	$0	$5.57	$4.05 - $7.03