DAWSON GEOPHYSICAL CO

CUSIP: 239359102 Class: CMN

CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM's Holding History (CIK: 0000919079)

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

Q1 2015
Shares 39,900 Value ($000) $444 Avg Close — Range —
Q4 2014
Shares 39,900 Value ($000) $444 Avg Close — Range —
Q3 2014
Shares 30,300 Value ($000) $551 Avg Close — Range —
Q2 2014
Shares 25,000 Value ($000) $716 Avg Close — Range —
Q1 2014
Shares 25,000 Value ($000) $712 Avg Close — Range —
Q4 2013
Shares 30,120 Value ($000) $1,014 Avg Close — Range —
Q3 2013
Shares 35,078 Value ($000) $1,139 Avg Close — Range —
Q2 2013
Shares 23,378 Value ($000) $862 Avg Close — Range —