QUANTERIX CORP

Ticker: QTRX CUSIP: 74766Q101 Class: Common Stock

Vanguard Personalized Indexing Management, LLC's Holding History (CIK: 0001767306)

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

Q4 2025

Shares 13,172 Value ($000) $84 Avg Close $6.21 Range $4.50 - $7.88

Q3 2025

Shares 13,008 Value ($000) $71 Avg Close $5.32 Range $4.15 - $7.09

Q2 2025

Shares 15,024 Value ($000) $100 Avg Close $5.57 Range $4.05 - $7.03

Q1 2025

Shares 10,694 Value ($000) $70 Avg Close $8.34 Range $6.16 - $12.41

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	13,172	$84	$6.21	$4.50 - $7.88
Q3 2025	13,008	$71	$5.32	$4.15 - $7.09
Q2 2025	15,024	$100	$5.57	$4.05 - $7.03
Q1 2025	10,694	$70	$8.34	$6.16 - $12.41