MDU Resources spin-off of Knife River corp; distribution ratio 1:4; effective May 31

MDU RESOURCES GROUP INC

Registration statement for Knife River spin-off declared effective by SEC.
Distribution of ~90% of Knife River shares to MDU holders: 1 share KNF per 4 shares MDU.
Record date May 22, distribution date May 31, 2023.
KNF to trade on NYSE after spin-off; when-issued trading starts May 25 under 'KNF WI'.
Investor day for Knife River scheduled for May 18, 2023.

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