Knife River Acquires Aggregates and Ready-Mix Business in Montana

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.

"These three acquisitions in the Mountain Segment support our strategy of targeting aggregates-based, vertically integrated opportunities in mid-size, higher-growth markets," said Knife River President and CEO Brian Gray. "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."

About Knife River

Knife River Corporation, a member of the S&P MidCap 400 index, mines aggregates and markets crushed stone, sand, gravel and related construction materials, including ready-mix concrete, asphalt and other value-added products. Knife River also performs vertically integrated contracting services, specializing in publicly funded DOT projects and private projects across the industrial, commercial and residential space. For more information about the company, visit www.kniferiver.com.

Forward-Looking Statement

The information in this release includes certain forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended. The forward-looking statements contained in this release, including, but not limited to, statements about the growth potential in Montana, aggregate reserves and strategic expansion, are expressed in good faith and are believed by Knife River to have a reasonable basis. Nonetheless, actual results may differ materially from the projected results expressed in the forward-looking statements. There can be no assurance that the actual results or developments anticipated by Knife River will be realized or, even if substantially realized, that they will have the expected consequences to or effects on Knife River or its business or operations. For a discussion of important factors that could cause actual results to differ materially from those expressed in the forward-looking statements, refer to Item 1A-Risk Factors in Knife River's Form 10-K. All forward-looking statements in this release are expressly qualified by such cautionary statements and by reference to the underlying assumptions. Undue reliance should not be placed on forward-looking statements, which speak only as of the date they are made. Except as required by law, Knife River does not undertake to update forward-looking statements, whether as a result of new information, future events or otherwise.

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Media Contact:

Tony Spilde, Vice President of Communications, [email protected]

Investor Contact:

Dara Dierks, Vice President of Investor Relations, [email protected]