COMBIMATRIX CORPORATION

CUSIP: 20009T303 Class: COM

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

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

Q2 2015
Shares 3,244 Value ($000) $5 Avg Close — Range —
Q1 2015
Shares 4,718 Value ($000) $9 Avg Close — Range —
Q4 2014
Shares 300 Value ($000) $0 Avg Close — Range —
Q3 2014
Shares 8,925 Value ($000) $11 Avg Close — Range —
Q2 2014
Shares 2,166 Value ($000) $5 Avg Close — Range —
Q4 2013
Shares 5,186 Value ($000) $12 Avg Close — Range —
Q3 2013
Shares 639 Value ($000) $2 Avg Close — Range —
Q2 2013
Shares 8,948 Value ($000) $28 Avg Close — Range —