CFO Anthony Valduga Stock Transactions and RSU Vesting

This Form 4 filing reports stock transactions by Anthony P. Valduga, CFO and COO of CoastalSouth Bancshares, Inc. (COSO). On April 27, 2026, Valduga received 13,000 shares through the vesting of restricted stock units (RSUs) that converted to common stock on a one-for-one basis. Additionally, he sold 3,841 shares at $25.59 per share, resulting in total proceeds of approximately $98,300. Following these transactions, Valduga directly owns 90,673 shares and holds an additional 30,424 shares indirectly through IRA accounts (27,924 in his IRA and 2,500 in his spouse's IRA). The filing shows a net increase in his overall ownership position after the RSU vesting and partial sale.