Form 4 Filing for Otto Robert P

This filing details a Form 4 submission by Otto Robert P, a non-employee director of BLACK HILLS CORP /SD/ (BKH). The transaction, dated May 1, 2026, involves the acquisition of 1921 shares of Common Stock. This acquisition is a result of a Restricted Stock Unit Grant, as indicated by footnote F1. The filing also notes the acquisition of 9764.9995 shares of Phantom Stock Units, which are convertible to Common Stock at a 1:1 ratio (footnote F2) and exercisable/expirable upon retirement (footnotes F3 and F4). Following these transactions, Otto Robert P holds 14994.9672 shares of Common Stock and 9764.9995 Phantom Stock Units.