Knife River Corporation (NYSE:KNF) announced today that it has acquired the assets of Donaldson Brothers Ready Mix Inc., an aggregates-based ready-mix supplier in western Montana. This is Knife River's third acquisition in its Mountain Segment in 2026.

Donaldson is a leading supplier of aggregates and ready-mix in the growing Bitterroot Valley, south of Missoula. In addition to three aggregates sources that provide the business with over 30 years of supply, Donaldson operates a ready-mix plant and manufactures precast concrete products.

Last month, Knife River acquired Morgan Asphalt Inc., based in Salt Lake City, Utah. In January, Knife River acquired the assets of Sparrow Enterprises Inc., in Helena, Mont.