DAWSON GEOPHYSICAL CO

CUSIP: 239359102 Class: CMN

Invesco Ltd.'s Holding History (CIK: 0000914208)

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

Q4 2014
Shares 13,016 Value ($000) $159 Avg Close — Range —
Q3 2014
Shares 12,355 Value ($000) $225 Avg Close — Range —
Q2 2014
Shares 11,859 Value ($000) $340 Avg Close — Range —
Q1 2014
Shares 16,566 Value ($000) $464 Avg Close — Range —
Q4 2013
Shares 13,094 Value ($000) $443 Avg Close — Range —
Q3 2013
Shares 11,438 Value ($000) $371 Avg Close — Range —
Q2 2013
Shares 7,212 Value ($000) $266 Avg Close — Range —