DAWSON GEOPHYSICAL CO

CUSIP: 239359102 Class: CMN

CHARLES SCHWAB INVESTMENT MANAGEMENT INC's Holding History (CIK: 0000884546)

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

Q4 2014
Shares 10,600 Value ($000) $130 Avg Close — Range —
Q3 2014
Shares 32,064 Value ($000) $583 Avg Close — Range —
Q2 2014
Shares 36,160 Value ($000) $1,036 Avg Close — Range —
Q1 2014
Shares 36,160 Value ($000) $1,013 Avg Close — Range —
Q4 2013
Shares 36,160 Value ($000) $1,223 Avg Close — Range —
Q3 2013
Shares 35,300 Value ($000) $1,160 Avg Close — Range —
Q2 2013
Shares 35,300 Value ($000) $1,332 Avg Close — Range —