WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

ProShare Advisors LLC's Holding History (CIK: 0001357955)

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

Q3 2014
Shares 15,900 Value ($000) $132 Avg Close — Range —
Q2 2014
Shares 19,498 Value ($000) $241 Avg Close — Range —
Q1 2014
Shares 40,435 Value ($000) $510 Avg Close — Range —
Q3 2013
Shares 25,393 Value ($000) $233 Avg Close — Range —
Q2 2013
Shares 25,164 Value ($000) $155 Avg Close — Range —