X0303 4 2009-08-18 0 0001001385 NORTHWEST PIPE CO NWPX 0001408150 STONE GARY 5721 SE COLUMBIA WAY SUITE 200 VANCOUVER WA 98661 0 1 0 0 VP, Quality Assurance Common Stock 2009-08-18 4 M 0 49 A 308 D Common Stock 2009-08-18 4 M 0 245 A 553 D Common Stock 2009-08-18 4 M 0 66 A 619 D Common Stock 2009-08-18 4 F 0 61 34 D 558 D Common Stock 2009-08-18 4 F 0 12 34 D 546 D Common Stock 2009-08-18 4 F 0 16 34 D 530 D Restricted stock units 2009-08-18 4 M 0 49 D Common Stock 49 830 D Restricted stock units 2009-08-18 4 M 0 245 D Common Stock 245 585 D Restricted stock units 2009-08-18 4 M 0 66 D Common Stock 66 519 D Represents shares acquired pursuant to vesting of restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Northwest Pipe Company common stock. The restricted stock units vested in full on August 18, 2009. The restricted stock units vest in 3 equal installments on February 18, 2009, August 18, 2009 and February 18, 2010. The restricted stock units vest 40% on August 18, 2009, 40% on August 18, 2010 and 20% on August 18, 2011. Gary Stone 2009-08-20