DOCUMENT SEC SYS INC

CUSIP: 25614T101 Class: CMN

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q4 2015
Shares 4,883 Value ($000) $1 Avg Close — Range —
Q3 2015
Shares 4,883 Value ($000) $1 Avg Close — Range —
Q2 2015
Shares 4,883 Value ($000) $1 Avg Close — Range —
Q1 2015
Shares 4,683 Value ($000) $2 Avg Close — Range —
Q3 2014
Shares 279,937 Value ($000) $238 Avg Close — Range —
Q2 2014
Shares 256,857 Value ($000) $352 Avg Close — Range —
Q1 2014
Shares 292,868 Value ($000) $375 Avg Close — Range —
Q4 2013
Shares 214,734 Value ($000) $445 Avg Close — Range —
Q3 2013
Shares 159,919 Value ($000) $182 Avg Close — Range —