Knife River Corp Posts Investor Presentation (Regulation FD Disclosure)

What Happened
Knife River Corporation announced on September 23, 2026 that it posted new investor presentation materials to the investor relations section of its website (https://investors.kniferiver.com/events-and-presentations). The materials were furnished with the 8-K as Exhibit 99.1 and company management may use all or parts of the presentation in meetings with the investment community.

Key Details

• Filing date: September 23, 2026 (Form 8-K, Item 7.01 Regulation FD Disclosure).
• Presentation: Investor Presentation dated September 2026, furnished as Exhibit 99.1.
• Location: Posted on Knife River’s investor relations website at the events-and-presentations page.
• Signed on the filing by Nathan W. Ring, Vice President and Chief Financial Officer.

Why It Matters
This is a Regulation FD disclosure indicating Knife River is sharing new investor-facing materials publicly to ensure broad, simultaneous access to information the company may present to analysts, investors and other stakeholders. Investors can review the posted presentation for the company’s latest messaging, strategic highlights or performance context; the 8-K itself does not report financial results or corporate actions beyond furnishing those materials.