ProBuild announced today it will buy the assets of Oso Lumber of Arlington, Wash., the No. 56 company on last year's ProSales 100. The deal, which will close on April 30, removes one of ProBuild's biggest competitors in western Washington and enables it to better serve markets north of Seattle.

Oso has six locations. It also makes trusses and wall panels, optimizes framing, and distributes windows and millwork. The company reported sales of $67 million in 2008, down 27% from the previous year, and has shrunk from nine locations in 2007.

"The addition of Oso will provide tremendous benefit and value to builders serving the western Washington market," ProBuild CEO Paul Hylbert said in a statement. "By acquiring an outstanding company like Oso, ProBuild can combine its national scope with Oso's local expertise and insight to offer customers unparalleled customer service and value."

"This is a great opportunity for both Oso Lumber and ProBuild," Oso President Adam Lingenfelter said in the same statement. "Oso Lumber has a substantial market presence in the Puget Sound, and the purchase of Oso significantly strengthens ProBuild's position here."

Terms of the deal weren't disclosed.

Denver-based ProBuild is America's biggest LBM dealer, with 2009 sales of roughly $3.2 billion and more than 470 facilities nationwide.