NORTHERN TR CORP

Ticker: NTRS CUSIP: 665859104 Class: COM

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

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

Q4 2019

Shares 40 Value ($000) $4 Avg Close $84.53 Range $70.73 - $91.70

Q3 2019

Shares 40 Value ($000) $4 Avg Close $75.31 Range $68.73 - $82.36

Q2 2019

Shares 40 Value ($000) $4 Avg Close $75.01 Range $68.81 - $81.17

Q1 2019

Shares 40 Value ($000) $4 Avg Close $72.96 Range $66.04 - $78.80

Q4 2018

Shares 40 Value ($000) $3 Avg Close $75.32 Range $61.37 - $86.09

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2019	40	$4	$84.53	$70.73 - $91.70
Q3 2019	40	$4	$75.31	$68.73 - $82.36
Q2 2019	40	$4	$75.01	$68.81 - $81.17
Q1 2019	40	$4	$72.96	$66.04 - $78.80
Q4 2018	40	$3	$75.32	$61.37 - $86.09