ZIX CORP

CUSIP: 98974P100 Class: COM

MARSHALL WACE, LLP's Holding History (CIK: 0001318757)

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

Q4 2020
Shares 19,123 Value ($000) $165 Avg Close — Range —
Q1 2019
Shares 96,638 Value ($000) $665 Avg Close — Range —
Q3 2016
Shares 254,258 Value ($000) $1,042 Avg Close — Range —