WILLIAMS CLAYTON ENERGY INC

CUSIP: 969490101 Class: CMN

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM's Holding History (CIK: 0001081019)

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

Q1 2017
Shares 11,724 Value ($000) $1,549 Avg Close — Range —
Q4 2016
Shares 12,324 Value ($000) $1,470 Avg Close — Range —
Q3 2016
Shares 12,624 Value ($000) $1,079 Avg Close — Range —
Q2 2016
Shares 12,524 Value ($000) $344 Avg Close — Range —
Q1 2016
Shares 12,624 Value ($000) $113 Avg Close — Range —
Q4 2015
Shares 10,911 Value ($000) $323 Avg Close — Range —
Q3 2015
Shares 10,760 Value ($000) $418 Avg Close — Range —
Q2 2015
Shares 10,760 Value ($000) $707 Avg Close — Range —
Q1 2015
Shares 10,760 Value ($000) $545 Avg Close — Range —
Q4 2014
Shares 10,960 Value ($000) $699 Avg Close — Range —
Q3 2014
Shares 10,914 Value ($000) $1,053 Avg Close — Range —
Q2 2014
Shares 10,752 Value ($000) $1,477 Avg Close — Range —
Q1 2014
Shares 10,752 Value ($000) $1,215 Avg Close — Range —
Q4 2013
Shares 10,652 Value ($000) $873 Avg Close — Range —
Q3 2013
Shares 10,552 Value ($000) $554 Avg Close — Range —
Q2 2013
Shares 10,260 Value ($000) $446 Avg Close — Range —
Q1 2013
Shares 10,300 Value ($000) $450 Avg Close — Range —