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(Address of principal executive offices, including zip code)

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes S  No £

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes S  No £

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting,” and “emerging growth company” in Rule 12b-2 of the Exchange Act:

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. £

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes £ No S

As of April 22, 2025, the registrant had 51,473,176 shares common stock, $0.01 par value per share, outstanding.

Nature of Operations—Stellar Bancorp, Inc. (“Stellar”) through its wholly-owned subsidiary, Stellar Bank (the “Bank” and together with Stellar, collectively referred to herein as “we,” “us,” “our” and the “Company”), provides a diversified range of commercial banking services primarily to small- to medium-sized businesses. Stellar derives substantially all of its revenues and income from the operation of the Bank.

    The Company is focused on delivering a wide variety of relationship-driven commercial banking products and community-oriented services tailored to meet the needs of small-to medium-sized businesses, professionals and individuals through its 54 banking centers with 37 banking centers in the Houston metropolitan statistical area (“MSA”), 16 banking centers in the Beaumont MSA and one banking center in Dallas, Texas.

Basis of Presentation—The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and in accordance with guidance provided by the Securities and Exchange Commission (“SEC”). Accordingly, the condensed consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments considered necessary for a fair presentation of the financial position, results of operations and cash flows of the Company on a consolidated basis, and all such adjustments are of a normal recurring nature. Transactions between Stellar and the Bank have been eliminated. The condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024. Operating results for the three months ended March 31, 2025 are not necessarily indicative of the results that may be expected for the year ending December 31, 2025.

Reclassifications—Certain items in the prior year financial statements were reclassified to conform to the current presentation. Reclassifications had no effect on prior year net income or shareholders’ equity.

Significant Accounting and Reporting Policies—The Company’s significant accounting and reporting policies can be found in Note 1 of the Company’s annual financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024.

Accounting Standards Update (“ASU”) 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” was issued in December 2023. This update requires that public business entities on an annual basis (1) disclose specific categories in the tax rate reconciliation, (2) provide additional information for reconciling items that meet a quantitative threshold and (3) disaggregate income taxes paid by jurisdiction. ASU 2023-09 is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The Company will adopt this ASU and does not believe it will have a significant impact on the Company's financial statements.

ASU 2024-03, “Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses”. This update requires that public businesses disclose details about specific expenses such as inventory purchases, employee compensation, depreciation, amortization and depletion. ASU 2023-09 is effective for annual reporting periods beginning after December 15, 2026. Early adoption is permitted. The Company is evaluating the impact of this ASU, but does not believe it will have a significant impact on the Company’s financial statements.

Changes in the carrying amount of the Company’s goodwill and core deposit intangible assets were as follows:

Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired recorded on the acquisition date of an entity. Goodwill is subject to impairment testing, which must be conducted at least annually or upon the occurrence of a triggering event. Various factors, such as the Company’s results of operations, the trading price of the Company’s common stock relative to the book value per share, macroeconomic conditions and conditions in the banking sector, inform whether a triggering event for an interim goodwill impairment test has occurred. Goodwill is recorded and evaluated for impairment at its reporting unit, the Company. The Company’s policy is to test goodwill for impairment annually as of October 1st, or on an interim basis if an event triggering an impairment assessment is determined to have occurred.

The estimated aggregate future amortization expense for core deposit intangible assets remaining as of March 31, 2025 is as follows (in thousands):

The amortized cost and fair value of securities available for sale were as follows:

As of March 31, 2025, no allowance for credit losses has been recognized on available for sale securities in an unrealized loss position as management does not believe any of the securities are impaired due to reasons of credit quality. This belief is based upon our analysis of the underlying risk characteristics, including credit ratings, and other qualitative factors related to our available for sale securities and in consideration of our historical credit loss experience and internal forecasts. The issuers of these securities continue to make timely principal and interest payments under the contractual terms of the securities. Furthermore, management does not have the intent to sell any of the securities classified as available for sale in the table above and believes that it is more likely than not that we will not have to sell any such securities before a recovery of cost. The unrealized losses are due to increases in market interest rates over the yields available at the time the underlying securities were purchased. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline.

The amortized cost and fair value of investment securities at March 31, 2025, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations at any time with or without call or prepayment penalties.

Securities with unrealized losses segregated by length of time in a continuous loss position were as follows: