Knife River Corporation announced the acquisition of Donaldson Brothers Ready Mix Inc., a long‑standing aggregates‑based ready‑mix supplier located in the Bitterroot Valley south of Missoula, Montana. The deal adds three aggregate sources that have supplied Donaldson for over 30 years, along with a ready‑mix plant and precast concrete operations, thereby expanding Knife River’s Mountain Segment and reinforcing its regional footprint in western Montana.
The acquisition is Knife River’s third purchase in the Mountain Segment during 2026, following the January acquisition of Sparrow Enterprises Inc. in Helena, Montana, and the February acquisition of Morgan Asphalt Inc. in Salt Lake City, Utah. CEO Brian Gray said the three deals “support our strategy of targeting aggregates‑based, vertically integrated opportunities in mid‑size, higher‑growth markets. The Donaldson assets provide strategic aggregate reserves in western Montana while establishing a foothold in a new market. Montana is growing, and we are now in an even better position to support that growth.”
Donaldson Brothers has served the Bitterroot Valley for more than six decades as a family‑owned business. Its three aggregate sources have supplied the company for over 30 years, and its ready‑mix plant has been a key supplier for local construction projects. By adding these assets, Knife River gains additional aggregate reserves and a ready‑mix operation that will help it capture more public‑sector and private‑sector pavement projects in the region.
Knife River’s 2026 guidance reflects the confidence that the acquisition will contribute to growth. The company is projecting full‑year revenue of $3.3 billion to $3.5 billion and adjusted EBITDA of $520 million to $560 million, building on a strong Q4 2025 performance that saw revenue rise 15 % to $755.1 million and adjusted EBITDA increase 47 % to $119.4 million. The acquisition aligns with Knife River’s broader strategy of expanding its footprint through targeted, vertically integrated acquisitions in high‑growth markets.
The deal value was not disclosed, and the closing date has not yet been announced. Nonetheless, the transaction represents a significant expansion of Knife River’s operational capabilities and market reach in Montana, reinforcing its position as a leading aggregates and ready‑mix provider in the region.
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