Form 4 Filing for GREAT SOUTHERN BANCORP, INC.

This filing details transactions made by Joseph W. Turner, President/CEO and a significant owner of GREAT SOUTHERN BANCORP, INC. On April 30, 2026, Turner acquired 6,000 shares of common stock at $52.20 per share and disposed of 6,000 shares at $68.1603 per share. Additionally, an option to purchase 6,000 shares of common stock at $52.20 per share, acquired under the ticker M, was disposed of on the same date. On April 14, 2026, 17 shares were acquired at $67.5743 per share, reported under footnote F1 as a voluntary filing for a DRIP acquisition. The filing also discloses various indirect holdings, including shares held through a spouse, a 401(k) plan, and a family partnership, as well as multiple unexercised stock options with varying exercise prices and expiration dates.