WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

Parallax Volatility Advisers, L.P.'s Holding History (CIK: 0001521001)

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

Q4 2017
Shares 7,476 Value ($000) $11 Avg Close — Range —
Q3 2013
Shares 225 Value ($000) $2 Avg Close — Range —