DAWSON GEOPHYSICAL CO

CUSIP: 239359102 Class: CMN

MUFG Americas Holdings Corp's Holding History (CIK: 0001011659)

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

Q2 2013
Shares 5,800 Value ($000) $214 Avg Close — Range —
Q1 2013
Shares 10,700 Value ($000) $282 Avg Close — Range —