DAWSON GEOPHYSICAL CO

CUSIP: 239359102 Class: CMN

AMERICAN CENTURY COMPANIES INC's Holding History (CIK: 0000748054)

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

Q4 2013
Shares 27,736 Value ($000) $938 Avg Close — Range —
Q3 2013
Shares 27,736 Value ($000) $901 Avg Close — Range —
Q2 2013
Shares 30,215 Value ($000) $1,114 Avg Close — Range —