COASTALSOUTH BANCSHARES, INC. REPORTS EARNINGS FOR SECOND QUARTER 2025

ATLANTA, GA (July 28, 2025) – CoastalSouth Bancshares, Inc. (“CoastalSouth” or the “Company”) (NYSE: COSO), the holding company for Coastal States Bank (the “Bank”), today reported net income of approximately $6.0 million, or $0.57 per diluted share, for the second quarter of 2025, compared to $5.1 million, or $0.47 per diluted share, for the first quarter of 2025, and $5.9 million, or $0.56 per diluted share, for the second quarter of 2024. For the year-to-date period ending June 30, 2025, the Company reported net income of $11.0 million, or $1.04 per diluted share, compared with $8.3 million, or $0.80 per diluted share, for the same period in 2024.

On July 3, 2025, the Company completed its initial public offering of 2,035,000 shares of common stock at a public offering price of $21.50 per share, before underwriting discounts and commissions. The Company received proceeds, net of underwriting discounts and commissions, of approximately $34.0 million in the offering related to the sale of 1,700,000 shares from the Company, and 335,000 additional shares were sold by selling shareholders. The Company’s common stock began trading on the New York Stock Exchange on July 2, 2025, under the ticker symbol “COSO”. The underwriters of the initial public offering have a 30-day option to purchase an additional 305,250 shares of common stock from selling shareholders at the initial public offering price to the public, less the underwriting discounts and commissions, from certain selling shareholders.

Commenting on the Company’s results, President and Chief Executive Officer, Stephen R. Stone stated, “The Company delivered strong financial results in the second quarter with growth in both loans held for investment and loans held for sale, continued growth in core deposits, and continued improvement to our net interest margin. With the momentum of the first six months of this year, particularly with respect to loan originations, and the addition of four new commercial bankers and two new business development officers, we are well-positioned as we head into the second half of 2025."

Second Quarter 2025 Performance Highlights:

Operating Highlights

Net interest income totaled $18.1 million for the second quarter of 2025, an increase of $1.3 million, or 7.9%, from $16.8 million for the first quarter of 2025 and an increase of $1.4 million, or 8.3% from the second quarter of 2024. The Company’s net interest margin expanded to 3.46% for the second quarter of 2025, an 8 basis point increase from the first quarter of 2025 and a 3 basis point increase from the second quarter of 2024.

The yield on average interest-earning assets for the second quarter of 2025 increased to 6.08% from 6.05% for the first quarter of 2025. This increase was primarily related to a 1 basis point increase in yield on LHFI and an increased average volume of approximately $77.8 million in the LHFI portfolio quarter over quarter. Compared to the second quarter of 2024, yields on earning assets decreased 31 basis points from 6.39%. The decrease was primarily attributable to a 33 basis point decrease in LHFI and an 84 basis point decrease in the yield on the loans held for sale portfolio.

The Company’s total cost of funds was 2.80% for the second quarter of 2025, a decrease of 5 basis points and 33 basis points compared with the first quarter of 2025 and second quarter of 2024, respectively Deposit costs decreased 5 basis points during the second quarter of 2025 to 2.75%, compared to 2.80% in the first quarter of 2025. The cost of interest-bearing deposits decreased 5 basis points during the second quarter of 2025 to 3.27%, compared with 3.32% in the first quarter of 2025, reflecting continued repricing of certificates of deposits in the second quarter of 2025.

Noninterest income totaled $1.8 million for the second quarter of 2025, a decrease of $86 thousand, or 4.6%, from the first quarter of 2025, primarily due to a decrease in other noninterest income, offset by a net increase in mortgage banking related income, gain on sale of government guaranteed loans ("GGL"), and other categories. Noninterest expense totaled $12.1 million for the second quarter of 2025, an increase of $673 thousand, or 5.9%, from the first quarter of 2025, primarily due to higher salaries and employee benefits and other professional fees. A number of strategic hires were made during the quarter including new commercial bankers, new GGL business development officers, and one mortgage loan officer.

The Company’s effective tax rate for the second quarter of 2025 was 15.1%, compared to 23.4% for the first quarter of 2025 and 21.1% for the second quarter of 2024. The decrease in effective tax rate from the first quarter of 2025 and the second quarter of 2024 was primarily due to the recognition of renewable energy tax credits.

Balance Sheet Trends

Total assets were $2.22 billion at June 30, 2025, an increase of $122.5 million, or 5.8%, from $2.10 billion at December 31, 2024. Loans held for sale ("LHFS") were $209.1 million at June 30, 2025, an increase of $35.1 million, or 20.2%, from $174.0 million at December 31, 2024. Gross LHFI were $1.53 billion at June 30, 2025, an increase of $117.8 million, or 8.4%, from $1.41 billion at December 31, 2024.

Total deposits were $1.97 billion at June 30, 2025, an increase of $133.5 million, or 7.3%, from $1.83 billion at December 31, 2024. Noninterest-bearing deposits were $313.4 million at June 30, 2025, compared to $302.9 million at December 31, 2024. Brokered certificates of deposits, a component of time deposits, were $307.9 million at June 30, 2025, as compared to $274.9 million at December 31, 2024, an increase of $33.0 million, or 12.0%.

Credit Quality

During the second quarter of 2025, the Company recorded a provision for credit losses of $752 thousand, compared to $629 thousand and $173 thousand during the first quarter of 2025 and second quarter of 2024, respectively. The provision expense recorded during the second quarter of 2025 was primarily due to increased loan production of LHFI, changes in economic factors, and current period net charge-offs, offset by other changes in loss rates. The Company's annualized net charge-offs to average LHFI ratio was 0.06% for the second quarter of 2025 as compared to 0.00% and 0.03% during the first quarter of 2025 and second quarter of 2024, respectively.

Nonperforming assets totaled $14.7 million, or 0.66% of total assets, at June 30, 2025 compared to $15.9 million, or 0.76% of total assets at December 31, 2024. The $1.2 million decrease in nonperforming assets at June 30, 2025 from December 31, 2024 was due to the sale of other real estate owned and payments collected on nonaccrual loans during the period. Adjusted nonperforming assets2, which excludes the guaranteed portions of nonaccrual loans, was $10.1 million, or 0.46% of total assets, at June 30, 2025 compared to $11.1 million, or 0.53% of total assets, at December 31, 2024.

About CoastalSouth Bancshares, Inc.

CoastalSouth Bancshares, Inc. is a bank holding company headquartered in Atlanta, Georgia. Through our wholly owned subsidiary, Coastal States Bank, a South Carolina state-chartered commercial bank, we offer a full range of banking products and services designed for businesses, real estate professionals, and consumers looking for a deep and meaningful relationship with their bank. To learn more about Coastal States Bank, visit www.coastalstatesbank.com.

Forward-Looking Statements

Statements in this press release regarding future events and our expectations and beliefs about our future financial performance and financial condition, as well as trends in our business and markets, constitute “forward-looking statements” within the meaning of, and subject to the protections of, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements are not historical in nature and may be identified by references to a future period or periods by the use of the words “believe,” “expect,” “anticipate,” “intend,” “plan,” “estimate,” “project,” “outlook,” or words of similar meaning, or future or conditional verbs such as “will,” “would,” “should,” “could,” or “may.” The forward-looking statements in this press release should not be relied on because they are based on current information and on assumptions that we make about future events and circumstances that are subject to a number of known and unknown risks and uncertainties that are often difficult to predict and beyond our control. As a result of those risks and uncertainties, and other factors, our actual financial results in the future could differ, possibly materially, from those expressed in or implied by the forward-looking statements contained in this press release and could cause us to make changes to our future plans. Factors that might cause such differences include, but are not limited to: the impact of current and future economic conditions, particularly those affecting the financial services industry, including the effects of declines in the real estate market, high unemployment rates, inflationary pressures, elevated interest rates and slowdowns in economic growth, as well as the financial stress on borrowers as a result of the foregoing; potential impacts of any adverse developments in the banking industry, including any impacts on customer confidence, deposit outflows, liquidity and the regulatory response thereto; changes in the interest rate environment, including changes to the federal funds rate; changes in prices, values and sales volumes of residential and commercial real estate; competition in our markets that may result in increased funding costs or reduced earning assets yields, thus reducing margins and net interest income; interest rate fluctuations, which could have an adverse effect on the Company’s profitability; a breach in security of our information systems, including the occurrence of a cyber-attack incidents or a deficiencies in cyber security; risks related to potential acquisitions; government actions, including tariffs, or trade wards (including reduced consumer spending, lower economic growth or recession, reduced demand for U.S. exports, disruptions to supply chains, and decreased demand for other banking products and services), legislation or regulatory changes which could adversely affect the ability of the consolidated Company to conduct business combinations or new operations; changes in tax laws; significant turbulence or a disruption in the capital or financial markets and the effect of a fall in stock market prices on our investment securities; the effects of war or other conflicts, domestic civil unrest and tyranny, and changes in the overall worlds geopolitical landscape; and adverse results from current or future litigation, regulatory examinations or other legal and/or regulatory actions, including as a result of the Company’s participation in and execution of government programs. Therefore, the Company can give no assurance that the results contemplated in the forward-looking statements will be realized. Additional information regarding these and other risks and uncertainties to which our business and future financial performance are subject is contained in the section titled “Cautionary Note Regarding Forward-Looking Statements” and “Risk Factors” in the Company’s final prospectus filed pursuant to Rule 424(b)(4) under the Securities Act of 1933, as amended, filed with the Securities and Exchange Commission (the “SEC”) on July 2, 2025 (Registration No. 333-287854), relating to our initial public offering, and in other documents that we file with the SEC from time to time, which are available on the SEC’s website, http://www.sec.gov. In addition, our actual financial results in the future may differ from those currently expected due to additional risks and uncertainties of which we are not currently aware or which we do not currently view as, but in the future may become, material to our business or operating results. Due to these and other possible uncertainties and risks, readers are cautioned not to place undue reliance on the forward-looking statements contained in this press release or to make predictions based solely on historical financial performance. Any forward-looking statement speaks only as of the date on which it is made, and we do not undertake any obligation to update or review any forward-looking statement, whether as a result of new information, future developments or otherwise, except as required by law. All forward-looking statements, express or implied, included in this press release are qualified in their entirety by this cautionary statement.