WILLIAMS CLAYTON ENERGY INC

CUSIP: 969490101 Class: CMN

DIMENSIONAL FUND ADVISORS LP's Holding History (CIK: 0000354204)

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

Q1 2017
Shares 415,566 Value ($000) $54,888 Avg Close — Range —
Q4 2016
Shares 421,008 Value ($000) $50,211 Avg Close — Range —
Q3 2016
Shares 450,785 Value ($000) $38,515 Avg Close — Range —
Q2 2016
Shares 453,973 Value ($000) $12,467 Avg Close — Range —
Q1 2016
Shares 580,284 Value ($000) $5,176 Avg Close — Range —
Q4 2015
Shares 583,089 Value ($000) $17,242 Avg Close — Range —
Q3 2015
Shares 487,952 Value ($000) $18,937 Avg Close — Range —
Q2 2015
Shares 440,132 Value ($000) $28,940 Avg Close — Range —
Q1 2015
Shares 404,090 Value ($000) $20,459 Avg Close — Range —
Q4 2014
Shares 407,149 Value ($000) $25,975 Avg Close — Range —
Q3 2014
Shares 410,084 Value ($000) $39,556 Avg Close — Range —
Q2 2014
Shares 381,000 Value ($000) $52,339 Avg Close — Range —
Q1 2014
Shares 352,761 Value ($000) $39,859 Avg Close — Range —
Q4 2013
Shares 340,630 Value ($000) $27,915 Avg Close — Range —
Q3 2013
Shares 319,321 Value ($000) $16,755 Avg Close — Range —
Q2 2013
Shares 306,846 Value ($000) $13,346 Avg Close — Range —