RUBICON TECHNOLOGY INC

CUSIP: 78112T107 Class: COM

Walleye Trading LLC's Holding History (CIK: 0001388391)

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

Q3 2015
Shares 2,574 Value ($000) $3 Avg Close — Range —
Q1 2015
Shares 67 Value ($000) $0 Avg Close — Range —
Q4 2014
Shares 1,940 Value ($000) $9 Avg Close — Range —
Q3 2014
Shares 14,948 Value ($000) $64 Avg Close — Range —
Q2 2014
Shares 5,203 Value ($000) $46 Avg Close — Range —
Q1 2014
Shares 4,101 Value ($000) $46 Avg Close — Range —