DAWSON GEOPHYSICAL CO

CUSIP: 239359102 Class: CMN

AMG National Trust Bank's Holding History (CIK: 0001388829)

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

Q4 2014
Shares 18,702 Value ($000) $229 Avg Close — Range —
Q3 2014
Shares 13,726 Value ($000) $250 Avg Close — Range —
Q2 2014
Shares 16,418 Value ($000) $470 Avg Close — Range —
Q1 2014
Shares 16,381 Value ($000) $459 Avg Close — Range —
Q4 2013
Shares 15,083 Value ($000) $510 Avg Close — Range —
Q3 2013
Shares 14,757 Value ($000) $479 Avg Close — Range —
Q2 2013
Shares 14,941 Value ($000) $551 Avg Close — Range —