Exhibit 99.1

July 16, 2026

Simmons First National Corporation Reports Second Quarter Results

Jay Brogdon, Simmons’ President and CEO, commented on second quarter 2026 results:

“Simmons delivered continued expansion in returns in the second quarter, reflecting revenue growth coupled with disciplined expense control. Committed loan production reached $1.8 billion, its highest quarterly level in almost four years, partially offset by expected paydowns, while our focus on disciplined loan and deposit pricing supported a stable net interest margin. Underlying trends in asset quality remain constructive, with net charge-offs of 20 basis points, provision expense exceeding net charge-offs by $8.3 million and continued positive trends in classified and criticized loans, even as we manage a single relationship that fully migrated to nonperforming in the second quarter.

During the quarter, the continued execution of efficiency initiatives more than funded our investments in the business, reflecting ongoing progress of our continuous improvement mindset. These actions included the elimination of certain positions and further optimization of our real estate footprint through meaningful square footage reductions.

As we look to the remainder of the year, we expect to sharpen our focus on the disciplined execution of these types of initiatives, which we believe will more than fund additional investments designed to further enhance the quality and sustainability of our organic growth outlook.”

Simmons First National Corporation (NASDAQ: SFNC) (Simmons or Company) today reported net income of $66.7 million for the second quarter of 2026, compared to net income of $68.5 million for the first quarter of 2026 and $54.8 million for the second quarter of 2025. Diluted earnings per share were $0.46 for the second quarter of 2026, compared to $0.47 for the first quarter of 2026 and $0.43 for the second quarter of 2025. Adjusted earnings¹ for the second quarter of 2026 were $72.2 million, compared to $68.6 million for the first quarter of 2026 and $56.1 million for the second quarter of 2025. Adjusted diluted earnings per share¹ for the second quarter of 2026 were $0.50, compared to $0.47 for the first quarter of 2026 and $0.44 for the second quarter of 2025.

For the second quarter of 2026, return on average assets was 1.09 percent and return on average common equity was 7.69 percent. Adjusted return on average assets¹ was 1.17 percent and adjusted return on average tangible common equity¹ was 14.37 percent.

The table below summarizes the impact of certain items, consisting primarily of branch/real estate rightsizing costs, severance/early retirement program costs, FDIC deposit insurance special assessment and certain professional services. These items are also described in further detail in the “Reconciliation of Non-GAAP Financial Measures” tables contained in this press release.

Impact of Certain Items on Earnings and Diluted Earnings Per Share (EPS)

Net Interest Income

Net interest income for the second quarter of 2026 totaled $200.6 million, up $3.5 million, or 7 percent annualized, compared to $197.2 million for the first quarter of 2026 and up $28.8 million, or 17 percent, compared to $171.8 million for the second quarter of 2025. The increase in net interest income on a linked quarter basis was primarily due to a $5.9 million increase in interest income, driven by a $7.0 million increase in loan interest income, offset in part by a $2.4 million increase in interest expense. The increase in net interest income on a year-over-year basis was primarily due to a $36.1 million decrease in interest expense, which included a $30.8 million decrease in interest bearing deposit costs and a $5.3 million decrease in the cost of other interest bearing liabilities. The decrease in interest expense compared to the prior year quarter reflected a reduction in wholesale funding as a result of the balance sheet repositioning completed in the third quarter of 2025, as well as a lower interest rate environment.

Net interest margin for the second quarter of 2026 on a fully taxable equivalent (FTE) basis² was 3.84 percent, unchanged from first quarter 2026 levels and up 78 basis points compared to 3.06 percent for the second quarter of 2025. The increase in net interest margin on a year-over-year basis primarily reflected the balance sheet repositioning that was completed during the third quarter of 2025.

Noninterest Income

Noninterest income for the second quarter of 2026 was $47.9 million, compared to $44.2 million in the first quarter of 2026 and $42.4 million in the second quarter of 2025. The increase in noninterest income on a linked quarter basis was primarily due to an increase in swap fee income and a positive valuation adjustment on Small Business Investment Company (SBIC) investments in the second quarter of 2026, both of which are included in other income in the table below.

Noninterest Expense

Noninterest expense for the second quarter of 2026 was $147.7 million, compared to $140.7 million in the first quarter of 2026 and $138.6 million in the second quarter of 2025. Included in noninterest expense are certain items consisting of branch/real estate rightsizing costs, severance/early retirement program costs, FDIC deposit insurance special assessment and certain professional services. Collectively, these items totaled $7.4 million in the second quarter of 2026, $30 thousand in the first quarter of 2026 and $1.8 million in the second quarter of 2025. Excluding these items (which are described in the “Reconciliation of Non-GAAP Financial Measures” table below) adjusted noninterest expense¹ was $140.3 million in the second quarter of 2026, $140.6 million in the first quarter of 2026 and $136.8 million in the second quarter of 2025. The efficiency ratio for the second quarter of 2026 was 58.72 percent, compared to 57.56 percent for the first quarter of 2026 and 62.82 percent for the second quarter of 2025. The adjusted efficiency ratio¹ was 54.26 percent for the second quarter of 2026, compared to 56.16 percent for the first quarter of 2026 and 60.52 percent for the second quarter of 2025.

Loans and Unfunded Loan Commitments

Total loans at the end of the second quarter of 2026 were $18.1 billion, up $129.5 million, or 3 percent annualized, compared to $17.9 billion at the end of the first quarter of 2026, and up $951.3 million, or 6 percent, compared to $17.1 billion at the end of the second quarter of 2025. The increase in total loans on a linked quarter basis was driven by increases in agricultural, commercial real estate and consumer and other portfolios, offset in part by a decrease in real estate construction. Unfunded loan commitments at the end of the second quarter of 2026 were $4.4 billion, compared to $4.1 billion at the end of the first quarter of 2026 and $3.9 billion at the end of the second quarter of 2025. The commercial loan pipeline totaled $1.4 billion at the end of the second quarter of 2026, and ready-to-close commercial loans totaled $374 million with a weighted average rate of 6.73 percent.

Deposits and Other Borrowings

Total deposits at the end of the second quarter of 2026 were $19.7 billion, compared to $20.2 billion at the end of the first quarter of 2026 and $21.8 billion at the end of the second quarter of 2025. Noninterest bearing deposits totaled $4.4 billion at the end of the second quarter of 2026, up $60.8 million, or 6 percent annualized, compared to $4.3 billion at the end of the first quarter of 2026. Interest bearing deposits at the end of the second quarter of 2026 totaled $15.4 billion, compared to $15.9 billion at the end of the first quarter of 2026 and $17.4 billion at the end of the second quarter of 2025. The decrease in interest bearing deposits on a linked quarter basis was driven by lower levels of interest bearing transaction accounts and savings accounts, and time deposits, coupled with a reduction in the utilization of brokered deposits given pricing relative to FHLB advances. The decrease in total deposits on a year-over-year basis primarily reflects a reduction of higher rate, non-relationship wholesale and public fund deposits as part of the balance sheet repositioning completed during the third quarter of 2025.

Other borrowings at the end of the second quarter of 2026 were $941.3 million, compared to $446.8 million at the end of the first quarter of 2026 and $634.3 million at the end of the second quarter of 2025. The increase in other borrowings on a linked quarter basis reflected increased utilization of short-term FHLB advances given favorable pricing.

Asset Quality

Provision for credit losses on loans totaled $17.4 million for the second quarter of 2026, compared to $14.6 million in the first quarter of 2026 and $11.9 million in the second quarter of 2025. Net charge-offs as a percentage of average loans for the second quarter of 2026 were 20 basis points, compared to 21 basis points in the first quarter of 2026 and 25 basis points in the second quarter of 2025. Provision for credit losses on loans exceeded net charge-offs by $8.3 million during the second quarter of 2026. The allowance for credit losses on loans at the end of the second quarter of 2026 was $238.2 million, compared to $229.9 million at the end of the first quarter of 2026 and $253.5 million at the end of the second quarter of 2025. The allowance for credit losses on loans as a percentage of total loans at the end of the second quarter of 2026 was 1.32 percent, compared to 1.28 percent at the end of the first quarter of 2026 and 1.48 percent at the end of the second quarter of 2025.

Loans past due 30-89 days as a percentage of total loans were 29 basis points at the end of the second quarter of 2026, compared to 51 basis points at the end of the first quarter of 2026 and 17 basis points at the end of the second quarter of 2025. Total nonperforming loans at the end of the second quarter of 2026 totaled $166.0 million, compared to $141.9 million at the end of the first quarter of 2026 and $157.2 million at the end of the second quarter of 2025. The increase in nonperforming loans on a linked quarter basis primarily reflected further migration of the remaining portion of a single 1-4 family real estate construction relationship previously disclosed in the first quarter of 2026. The nonperforming loan coverage ratio ended the second quarter of 2026 at 143 percent, compared to 162 percent at the end of the first quarter of 2026 and 161 percent at the end of the second quarter of 2025. Total nonperforming assets as a percentage of total assets were 72 basis points at the end of the second quarter of 2026, compared to 63 basis points at the end of the first quarter of 2026 and 62 basis points at the end of the second quarter of 2025.

Capital

Total stockholders’ equity at the end of the second quarter of 2026 was $3.5 billion, compared to $3.4 billion at the end of the first quarter of 2026 and $3.5 billion at the end of the second quarter of 2025. Book value per share at the end of the second quarter of 2026 was $24.11, compared to $23.70 at the end of the first quarter of 2026 and $28.17 at the end of the second quarter of 2025. Tangible book value per share¹ at the end of the second quarter of 2026 was $14.42, compared to $14.03 at the end of the first quarter of 2026 and $16.97 at the end of the second quarter of 2025. The increase in book value per share and tangible book value per share on a linked quarter basis was primarily due to a $35.6 million increase in undivided profits. The year-over-year decline in book value per share and tangible book value per share was primarily due to the balance sheet repositioning completed in the third quarter of 2025.

Total stockholders’ equity as a percentage of total assets at the end of the second quarter of 2026 was 14.1 percent, compared to 13.9 percent at the end of first quarter of 2026 and 13.3 percent at the end of the second quarter of 2025. Tangible common equity as a percentage of tangible assets¹ was 8.9 percent at the end of the second quarter of 2026, compared to 8.7 percent at the end of the first quarter of 2026 and 8.5 percent at the end of the second quarter of 2025. Both Simmons and its principal subsidiary, Simmons Bank, continue to maintain regulatory capital ratios significantly above “well-capitalized” regulatory guidelines.

Share Repurchase Program

During the second quarter of 2026, Simmons repurchased approximately 0.7 million shares of its Class A common stock at an average price of $21.52 under its 2026 stock repurchase program (2026 Program). Remaining authorization under the 2026 Program as of June 30, 2026, was approximately $161 million. The timing, pricing and amount of any repurchases under the 2026 Program will be determined by Simmons’ management at its discretion based on a variety of factors, including, but not limited to, market conditions, trading volume and market price of Simmons’ common stock, Simmons’ capital needs, Simmons’ working capital and investment requirements, other corporate considerations, economic conditions, and legal requirements. The 2026 Program does not obligate Simmons to repurchase any common stock and may be modified, discontinued or suspended at any time without prior notice.

Conference Call

Management will conduct a live conference call to review this information beginning at 7:30 a.m. Central Time on Friday, July 17, 2026. Interested parties can listen to this call by dialing toll-free 1-844-481-2779 (North America only) and asking for the Simmons First National Corporation conference call, conference ID 10210202. In addition, the call will be available live or in recorded version on Simmons’ website at simmonsbank.com for at least 60 days following the date of the call.

Simmons First National Corporation

Simmons First National Corporation (NASDAQ: SFNC) is a Mid-South based financial holding company that has paid cash dividends to its shareholders for 117 consecutive years. Its principal subsidiary, Simmons Bank, operates 220 branches in Arkansas, Kansas, Missouri, Oklahoma, Tennessee and Texas. Founded in 1903, Simmons Bank offers comprehensive financial solutions delivered with a client-centric approach. Recently, Simmons Bank was recognized by Newsweek as one of America’s Best Regional Banks and Credit Unions 2026 and by Forbes as one of America’s Best-In-State Companies 2026. In 2025, Simmons Bank was recognized by Newsweek as one of America’s Greatest Workplaces 2025 in Arkansas and one of America’s Best Regional Banks 2025, and by U.S. News & World Report as one of the 2024-2025 Best Companies to Work For in the South. Additional information about Simmons Bank can be found on our website at simmonsbank.com, by following @Simmons_Bank on X or by visiting our newsroom.

Non-GAAP Financial Measures

This press release contains financial information determined by methods other than in accordance with U.S. generally accepted accounting principles (GAAP). The Company’s management uses these non-GAAP financial measures in their analysis of the Company’s performance. These measures adjust GAAP performance measures to, among other things, include the tax benefit associated with revenue items that are tax-exempt, as well as exclude from net income (including on a per share diluted basis), pre-tax, pre-provision earnings, net charge-offs, income available to common shareholders, noninterest income, and noninterest expense certain income and expense items attributable to, for example, branch/real estate rightsizing costs, severance/early retirement program costs, FDIC deposit insurance special assessment and certain professional services.

In addition, the Company also presents certain figures based on tangible common stockholders’ equity, tangible assets and tangible book value, which exclude goodwill and other intangible assets. The Company further presents certain figures that are exclusive of the impact of deposits and/or loans acquired through acquisitions, mortgage warehouse loans, and/or energy loans, or gains and/or losses on the sale of securities. The Company’s management believes that these non-GAAP financial measures are useful to investors because they, among other things, present the results of the Company’s ongoing operations without the effect of mergers or other items not central to the Company’s ongoing business, as well as normalize for tax effects and certain other effects. Management, therefore, believes presentations of these non-GAAP financial measures provide useful supplemental information that is essential to a proper understanding of the operating results of the Company’s ongoing businesses, and management uses these non-GAAP financial measures to assess the performance of the Company’s ongoing businesses as related to prior financial periods. These non-GAAP disclosures should not be viewed as a substitute for operating results determined in accordance with GAAP, nor are they necessarily comparable to non-GAAP performance measures that may be presented by other companies. Where non-GAAP financial measures are used, the comparable GAAP financial measure, as well as the reconciliation to the comparable GAAP financial measure, can be found in the tables of this release.

Forward-Looking Statements

Certain statements in this press release may not be based on historical facts and should be considered “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements, including, without limitation, statements made in Mr. Brogdon’s quote, may be identified by reference to future periods or by the use of forward-looking terminology, such as “believe,” “budget,” “expect,” “foresee,” “anticipate,” “intend,” “indicate,” “target,” “estimate,” “plan,” “project,” “continue,” “contemplate,” “positions,” “prospects,” “predict,” or “potential,” by future conditional verbs such as “will,” “would,” “should,” “could,” “might” or “may,” or by variations of such words or by similar expressions. These forward-looking statements include, without limitation, statements relating to Simmons’ future growth, business strategies, lending capacity and lending activity, loan demand, revenue, assets, asset quality, profitability, dividends, net interest margin, non-interest revenue, share repurchase program, acquisition strategy, digital banking initiatives, the Company’s ability to recruit and retain key employees, the adequacy of the allowance for credit losses, future economic conditions and interest rates, and the adequacy of reserve levels for loans. Any forward-looking statement speaks only as of the date of this press release, and Simmons undertakes no obligation to update these forward-looking statements to reflect events or circumstances that occur after the date of this press release. By nature, forward-looking statements are based on various assumptions and involve inherent risk and uncertainties. Various factors, including, but not limited to, changes in economic conditions, changes in credit quality, changes in interest rates and related governmental policies, the effects of a government shutdown, changes in loan demand, changes in deposit flows, changes in real estate values, changes in the assumptions used in making the forward-looking statements, changes in the securities markets generally or the price of Simmons’ common stock specifically, changes in information technology affecting the financial industry, and changes in customer behaviors, including consumer spending, borrowing, and saving habits; changes in tariff policies; general economic and market conditions; changes in governmental administrations; market disruptions including pandemics or significant health hazards, severe weather conditions, natural disasters, terrorist activities, financial crises, political crises, war and other military conflicts (including the ongoing military conflicts in the Middle East and between Russia and Ukraine) or other major events, or the prospect of these events; the soundness of other financial institutions and any indirect exposure related to the closings of other financial institutions and their impact on the broader market through other customers, suppliers and partners, or that the conditions which resulted in the liquidity concerns experienced by closed financial institutions may also adversely impact, directly or indirectly, other financial institutions and market participants with which the Company has commercial or deposit relationships; increased inflation; the loss of key employees; increased competition in the markets in which the Company operates and from non-bank financial institutions; increased unemployment; labor shortages; claims, damages, and fines related to litigation or government actions; changes in accounting principles relating to loan loss recognition (current expected credit losses); fraud that results in material losses or that the Company has not discovered yet that may result in material losses; the Company’s ability to manage and successfully integrate its mergers and acquisitions and to fully realize cost savings and other benefits associated with acquisitions; increased delinquency and foreclosure rates on commercial real estate loans; significant increases in nonaccrual loan balances; cyber or other information technology threats, attacks or events; emerging issues related to the development and use of artificial intelligence that could give rise to legal or regulatory action or increase cybersecurity threats; reliance on third parties for key services; government legislation; and other factors, many of which are beyond the control of the Company, could cause actual results to differ materially from those projected in or contemplated by the forward-looking statements. In addition, there can be no guarantee that the board of directors (Board) of Simmons will approve a quarterly dividend in future quarters, and the timing, payment, and amount of future dividends (if any) is subject to, among other things, the discretion of the Board and may differ significantly from past dividends. Additional information on factors that might affect the Company’s financial results is included in the Company’s Form 10-K for the year ended December 31, 2025, the Company’s Form 10-Q for the quarter ended March 31, 2026, and other reports that the Company has filed with or furnished to the U.S. Securities and Exchange Commission (the SEC), all of which are available from the SEC on its website, www.sec.gov.

FOR MORE INFORMATION CONTACT:

Ed Bilek, EVP, Director of Investor and Media Relations

[email protected]

205.612.3378 (cell)

Page 1

Page 2

Page 3