NORTHWEST PIPE CO

Ticker: NWPX CUSIP: 667746101 Class: Common Stock

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

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

Q4 2017

Shares 1,428 Value ($000) $27 Avg Close $18.52 Range $16.62 - $21.11

Q4 2016

Shares 12,114 Value ($000) $209 Avg Close $15.40 Range $11.80 - $18.92

Q2 2016

Shares 3 Value ($000) $0 Avg Close $9.56 Range $8.37 - $11.27

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2017	1,428	$27	$18.52	$16.62 - $21.11
Q4 2016	12,114	$209	$15.40	$11.80 - $18.92
Q2 2016	3	$0	$9.56	$8.37 - $11.27