DAWSON GEOPHYSICAL CO

CUSIP: 239359102 Class: CMN

VANGUARD GROUP INC's Holding History (CIK: 0000102909)

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

Q4 2014
Shares 298,325 Value ($000) $3,648 Avg Close — Range —
Q3 2014
Shares 254,971 Value ($000) $4,636 Avg Close — Range —
Q2 2014
Shares 249,439 Value ($000) $7,146 Avg Close — Range —
Q1 2014
Shares 256,832 Value ($000) $7,194 Avg Close — Range —
Q4 2013
Shares 270,139 Value ($000) $9,136 Avg Close — Range —
Q3 2013
Shares 283,258 Value ($000) $9,197 Avg Close — Range —
Q2 2013
Shares 242,812 Value ($000) $8,949 Avg Close — Range —