Knife River holds investor day; spin-off from MDU Resources effective May 31, 2023

Knife River Corp

Separation via pro rata distribution of ~90% of Knife River Holding Company common stock to MDU Resources stockholders.
Distribution effective 11:59 p.m. EDT on May 31, 2023.
Investor day held May 18, 2023; presentation furnished as Exhibit 99.1.
Knife River to become standalone public company under ticker KNF.

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