DOCUMENT SEC SYS INC

CUSIP: 25614T200 Class: COM NEW

DIMENSIONAL FUND ADVISORS LP's Holding History (CIK: 0000354204)

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

Q4 2018
Shares 34,242 Value ($000) $25 Avg Close — Range —
Q3 2018
Shares 82,160 Value ($000) $87 Avg Close — Range —
Q2 2018
Shares 82,160 Value ($000) $105 Avg Close — Range —
Q1 2018
Shares 82,160 Value ($000) $110 Avg Close — Range —