WILLIAMS CLAYTON ENERGY INC

CUSIP: 969490101 Class: CMN

MASSACHUSETTS FINANCIAL SERVICES CO /MA/'s Holding History (CIK: 0000912938)

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

Q4 2014
Shares 29,409 Value ($000) $1,876,294 Avg Close — Range —
Q3 2014
Shares 18,591 Value ($000) $1,793 Avg Close — Range —
Q2 2014
Shares 18,970 Value ($000) $2,606 Avg Close — Range —
Q1 2014
Shares 21,760 Value ($000) $2,459,098 Avg Close — Range —