0000854560 2026-06-17 2026-06-17 false 0000854560 8-K 2026-06-17 GREAT SOUTHERN BANCORP, INC. MD 0-18082 43-1524856 1451 East Battlefield Springfield MO 65804 417 887-4400 false false false false Common Stock, par value $0.01 per share GSBC NASDAQ false