DOCUMENT SEC SYS INC

CUSIP: 25614T309 Class: COM NEW

Tower Research Capital LLC (TRC)'s Holding History (CIK: 0001533421)

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

Q3 2021
Shares 15,625 Value ($000) $20 Avg Close — Range —
Q1 2021
Shares 6,896 Value ($000) $25 Avg Close — Range —
Q3 2020
Shares 591 Value ($000) $3 Avg Close — Range —