QUANTERIX CORP

Ticker: QTRX CUSIP: 74766Q101 Class: Common Stock

ESSEX INVESTMENT MANAGEMENT CO LLC's Holding History (CIK: 0000201772)

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

Q4 2019

Shares 100,628 Value ($000) $2,378 Avg Close $22.82 Range $19.08 - $26.07

Q3 2019

Shares 129,837 Value ($000) $2,851 Avg Close $27.89 Range $21.17 - $35.69

Q2 2019

Shares 60,452 Value ($000) $2,043 Avg Close $25.87 Range $19.54 - $36.15

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2019	100,628	$2,378	$22.82	$19.08 - $26.07
Q3 2019	129,837	$2,851	$27.89	$21.17 - $35.69
Q2 2019	60,452	$2,043	$25.87	$19.54 - $36.15