WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

Aperio Group, LLC's Holding History (CIK: 0001364615)

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

Q1 2015
Shares 10,048 Value ($000) $33 Avg Close — Range —
Q3 2014
Shares 10,851 Value ($000) $90 Avg Close — Range —
Q2 2014
Shares 10,389 Value ($000) $128 Avg Close — Range —
Q1 2014
Shares 10,389 Value ($000) $131 Avg Close — Range —
Q4 2013
Shares 10,389 Value ($000) $98 Avg Close — Range —
Q3 2013
Shares 10,287 Value ($000) $94 Avg Close — Range —
Q2 2013
Shares 10,144 Value ($000) $62 Avg Close — Range —