QUANTERIX CORP

Ticker: QTRX CUSIP: 74766Q101 Class: Common Stock

Flagship Pioneering, LLC's Holding History (CIK: 0001400240)

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

Q2 2019

Shares 1,825,412 Value ($000) $61,681 Avg Close $25.87 Range $19.54 - $36.15

Q1 2019

Shares 2,030,495 Value ($000) $52,448 Avg Close $22.33 Range $17.08 - $26.06

Q4 2018

Shares 2,030,495 Value ($000) $37,178 Avg Close $17.94 Range $16.00 - $22.23

Q3 2018

Shares 2,030,495 Value ($000) $43,493 Avg Close $15.81 Range $13.00 - $22.61

Q2 2018

Shares 2,030,495 Value ($000) $29,158 Avg Close $17.31 Range $13.53 - $20.83

Q1 2018

Shares 2,030,495 Value ($000) $34,600 Avg Close $20.04 Range $16.03 - $24.80

Q4 2017

Shares 2,030,495 Value ($000) $43,595 Avg Close $19.52 Range $15.56 - $23.70

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2019	1,825,412	$61,681	$25.87	$19.54 - $36.15
Q1 2019	2,030,495	$52,448	$22.33	$17.08 - $26.06
Q4 2018	2,030,495	$37,178	$17.94	$16.00 - $22.23
Q3 2018	2,030,495	$43,493	$15.81	$13.00 - $22.61
Q2 2018	2,030,495	$29,158	$17.31	$13.53 - $20.83
Q1 2018	2,030,495	$34,600	$20.04	$16.03 - $24.80
Q4 2017	2,030,495	$43,595	$19.52	$15.56 - $23.70