COMBIMATRIX CORPORATION

CUSIP: 20009T121 Class: *W EXP 05/01/201

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

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

Q1 2014
Shares 225 Value ($000) $0 Avg Close — Range —
Q4 2013
Shares 550 Value ($000) $0 Avg Close — Range —
Q2 2013
Shares 228 Value ($000) $0 Avg Close — Range —