ZIX CORP

CUSIP: 98974P100 Class: COM

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

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

Q4 2020
Shares 240,958 Value ($000) $2,079 Avg Close — Range —
Q3 2020
Shares 278,172 Value ($000) $1,625 Avg Close — Range —
Q2 2020
Shares 270,382 Value ($000) $1,866 Avg Close — Range —
Q1 2020
Shares 281,981 Value ($000) $1,215 Avg Close — Range —
Q4 2019
Shares 277,742 Value ($000) $1,883 Avg Close — Range —
Q3 2019
Shares 269,806 Value ($000) $1,953 Avg Close — Range —
Q2 2019
Shares 290,743 Value ($000) $2,643 Avg Close — Range —
Q4 2016
Shares 25,356 Value ($000) $125 Avg Close — Range —
Q4 2015
Shares 205,351 Value ($000) $1,043 Avg Close — Range —
Q3 2015
Shares 216,021 Value ($000) $909 Avg Close — Range —
Q2 2015
Shares 207,459 Value ($000) $1,073 Avg Close — Range —
Q2 2013
Shares 43,191 Value ($000) $183 Avg Close — Range —