Exhibit 99.1 Hawthorn Bancshares Reports First Quarter 2026 Results Jefferson City, MO — April 29, 2026 — Hawthorn Bancshares, Inc. (NASDAQ: HWBK), (the "Company"), the bank holding company for Hawthorn Bank, reported first quarter 2026 net income of $6.8 million, or earnings per diluted share ("EPS") of $0.98. First Quarter 2026 Results • Net income improved $1.4 million, or 25.9%, to $6.8 million from the first quarter 2025 (the "prior year quarter") and the efficiency ratio improved to 60.46% compared to ...