Form 3 Filing for John Simon Fraser

This filing details the initial ownership report (Form 3) for John Simon Fraser, an officer and/or director of CoastalSouth Bancshares, Inc. (COSO). The report includes information on derivative holdings, specifically Restricted Stock Units (RSUs) that convert to common stock on a one-for-one basis and vest fully on December 31, 2026. It also lists non-derivative holdings of common stock, including direct ownership and indirect ownership through an IRA and a trust. Additionally, the filing includes an exhibit detailing a Power of Attorney granted by John Simon Fraser to certain individuals, authorizing them to execute and file Section 16 reports (Forms 3, 4, and 5) on his behalf with the SEC. This Power of Attorney remains in effect until Fraser is no longer required to file these forms or until it is revoked in writing.