Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.
On May 12, 2026, the Board of Directors of Hills Bancorporation approved an amendment (the "Amendment") to the Company's Bylaws (the "Bylaws") to include a new section 1 to Article VI regarding issuance of paper certificates for shares, including that the default form of share ownership will be uncertificated book entry registration. In addition, also effective as of May 12, 2026, the Board authorized the restatement of the Bylaws, as amended. The text of the Amendment is attached hereto as Exhibit 3.1.