Form 4 Filing for Steven Richard Mills

On May 1, 2026, Steven Richard Mills, a director at BLACK HILLS CORP /SD/, acquired 1,921 shares of Common Stock. This acquisition was part of a Restricted Stock Unit Grant for a non-employee director, with a reported value of $0.00 per share. Following this transaction, Mr. Mills now directly holds 29,622.2309 shares of Common Stock. Additionally, he holds 22,105.2207 shares of Common Stock indirectly through a trust, represented by Phantom Stock Units. These derivative securities are exercisable and expire upon retirement, with a 1-for-1 conversion ratio to Common Stock.