WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

Swiss National Bank's Holding History (CIK: 0001582202)

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

Q1 2015
Shares 46,600 Value ($000) $154 Avg Close — Range —
Q4 2014
Shares 46,600 Value ($000) $292 Avg Close — Range —
Q3 2014
Shares 46,600 Value ($000) $388 Avg Close — Range —
Q2 2014
Shares 46,600 Value ($000) $576 Avg Close — Range —
Q1 2014
Shares 46,600 Value ($000) $588 Avg Close — Range —
Q4 2013
Shares 36,500 Value ($000) $344 Avg Close — Range —
Q3 2013
Shares 36,500 Value ($000) $335 Avg Close — Range —
Q2 2013
Shares 38,700 Value ($000) $238 Avg Close — Range —