Exhibit 99.1

For Immediate Release

Investar Holding Corporation Announces 2025 Third Quarter Results and Wichita Falls Bancshares, Inc. Transaction Update

BATON ROUGE, LA / ACCESS Newswire / October 20, 2025 / Investar Holding Corporation (“Investar”) (NASDAQ:ISTR), the holding company for Investar Bank, National Association (the “Bank”), today announced financial results for the quarter ended September 30, 2025. Investar reported net income available to common shareholders of $5.7 million, or $0.54 per diluted common share, for the third quarter of 2025, compared to net income available to common shareholders of $4.5 million, or $0.46 per diluted common share, for the quarter ended June 30, 2025, and net income available to common shareholders of $5.4 million, or $0.54 per diluted common share, for the quarter ended September 30, 2024.

On a non-GAAP basis, core earnings per diluted common share for the third quarter of 2025 were $0.54 compared to $0.47 for the second quarter of 2025, and $0.45 for the third quarter of 2024. Core earnings available to common shareholders exclude certain items including, but not limited to, gain on call or sale of investment securities, net; loss on sale or disposition of fixed assets, net; gain (loss) on sale of other real estate owned, net; change in the fair value of equity securities; income from insurance proceeds; income from legal settlement; change in the net asset value of other investments; write down of other real estate owned; severance; acquisition expense; and legal settlement expense (refer to the Reconciliation of Non-GAAP Financial Measures tables for a reconciliation of GAAP to non-GAAP metrics).

Investar’s President and Chief Executive Officer John D’Angelo commented:

“I am very pleased with our third quarter results as we continued to execute on our strategy of consistent, quality earnings through the optimization of our balance sheet. As a result of this strategy, our net interest margin improved substantially to 3.16%, a 13 basis point increase from previous quarter, and we had significant improvements in our return on average assets and efficiency ratio.

For the third consecutive quarter, we were able to grow the yield on interest-earning assets while simultaneously reducing our funding costs. Total loans increased 2.1% (8.4% annualized) as we brought on new business, primarily variable-rate loans, at a blended interest rate of 7.5%, which progressed us towards our goal of an interest rate neutral balance sheet. Our decision over the past year to keep duration short on our liabilities provided us the flexibility to secure lower cost funding that was accretive to our net interest margin by allowing higher cost brokered time deposits to run off and replacing them with lower cost, non-maturing deposits.

As always, we remain focused on shareholder value and returning capital to shareholders. We repurchased 14,722 shares of our common stock during the third quarter at an average price of $21.55, which was below tangible book value per common share of $22.76 at September 30, 2025.”

Third Quarter Highlights

Loans

Total loans were $2.15 billion at September 30, 2025, an increase of $44.2 million, or 2.1%, compared to June 30, 2025, and a decrease of $5.3 million, or 0.2%, compared to September 30, 2024.

The following table sets forth the composition of the total loan portfolio as of the dates indicated (dollars in thousands).

Nonowner-occupied loans totaled $459.7 million at September 30, 2025, a decrease of $6.3 million, or 1.4%, compared to $466.0 million at June 30, 2025, and a decrease of $39.6 million, or 7.9%, compared to $499.3 million at September 30, 2024. The decrease in nonowner-occupied loans compared to June 30, 2025 and September 30, 2024 was primarily due to loan amortization and payoffs that aligned with our continued strategy to optimize and de-risk the mix of the portfolio.

Construction and development loans totaled $140.6 million at September 30, 2025, a decrease of $1.1 million, or 0.8%, compared to $141.7 million at June 30, 2025, and a decrease of $26.4 million, or 15.8%, compared to $167.0 million at September 30, 2024. The decrease in construction and development loans compared to June 30, 2025 and September 30, 2024 was primarily due to payoffs and conversions to permanent loans upon completion of construction.

Credit Quality

Nonperforming loans were $7.7 million, or 0.36% of total loans, at September 30, 2025, an increase of $0.2 million compared to $7.5 million, or 0.36% of total loans, at June 30, 2025, and an increase of $3.6 million compared to $4.1 million, or 0.19% of total loans, at September 30, 2024. The increase in nonperforming loans compared to June 30, 2025 was primarily attributable to owner-occupied commercial real estate loans totaling $0.9 million and 1-4 family loans totaling $0.3 million, partially offset by the transfer of a $0.7 million 1-4 family loan to other real estate owned. 

The allowance for credit losses was $26.5 million, or 344.7% and 1.23% of nonperforming and total loans, respectively, at September 30, 2025, compared to $26.6 million, or 355.9% and 1.26% of nonperforming and total loans, respectively, at June 30, 2025, and $28.1 million, or 682.0% and 1.30% of nonperforming and total loans, respectively, at September 30, 2024. 

Investar recorded a provision for credit losses of $0.1 million for each of the quarters ended September 30, 2025 and June 30, 2025 compared to a negative provision for credit losses of $0.9 million for the quarter ended September 30, 2024. The provision for credit losses in the quarter ended September 30, 2025 was primarily due to loan growth partially offset by changes in the economic forecast and loan mix. The provision for credit losses in the quarter ended June 30, 2025 was primarily due to changes in the economic forecast and loan mix. The negative provision for credit losses for the quarter ended September 30, 2024 was primarily due to net recoveries of $0.4 million, a decrease in total loans, aging of existing loans, and an improvement in the economic forecast.

Deposits

Total deposits at September 30, 2025 were $2.37 billion, an increase of $34.5 million, or 1.5%, compared to $2.34 billion at June 30, 2025, and an increase of $85.3 million, or 3.7%, compared to $2.29 billion at September 30, 2024.

The following table sets forth the composition of deposits as of the dates indicated (dollars in thousands).

The increase in interest-bearing demand deposits, money market deposits, savings deposits, and time deposits at September 30, 2025 compared to June 30, 2025 was primarily the result of organic growth. Brokered time deposits were $210.8 million at September 30, 2025 compared to $256.1 million at June 30, 2025 and $271.7 million at September 30, 2024. Investar utilizes brokered time deposits, entirely in denominations of less than $250,000, to secure fixed cost funding and reduce short-term borrowings. At September 30, 2025, the balance of brokered time deposits remained below 10% of total assets, and the remaining weighted-average duration was approximately three months with a weighted-average rate of 4.51%.

Stockholders’ Equity 

On July 1, 2025, Investar completed a private placement of 32,500 shares of its newly designated Series A Preferred Stock with selected institutional and other accredited investors at a price of $1,000 per share, for aggregate gross proceeds of $32.5 million. The net proceeds were $30.4 million, after deducting placement agent fees and other offering related expenses. Investar intends to use the net proceeds from the offering to support the acquisition of Wichita Falls and for general corporate purposes, including organic growth and other potential acquisitions.

Stockholders’ equity was $295.3 million at September 30, 2025, an increase of $39.4 million compared to June 30, 2025, and an increase of $49.8 million compared to September 30, 2024. The increase in stockholders’ equity compared to June 30, 2025 was primarily attributable to the issuance of the Series A Preferred Stock, net income for the quarter and a decrease in accumulated other comprehensive loss due to an increase in the fair value of the Bank’s available for sale securities portfolio. The increase in stockholders’ equity compared to September 30, 2024 was primarily attributable to the issuance of the Series A Preferred Stock, net income for the last twelve months and a decrease in accumulated other comprehensive loss due to an increase in the fair value of the Bank’s available for sale securities portfolio.

Net Interest Income

Net interest income for the third quarter of 2025 totaled $21.2 million, an increase of $1.5 million, or 7.7%, compared to the second quarter of 2025, and an increase of $3.3 million, or 18.5%, compared to the third quarter of 2024. Total interest income was $37.1 million, $35.4 million and $36.8 million for the quarters ended September 30, 2025, June 30, 2025 and September 30, 2024, respectively. Total interest expense was $15.9 million, $15.7 million and $19.0 million for the corresponding periods. Included in net interest income for the quarters ended September 30, 2025, June 30, 2025 and September 30, 2024 is $6,000, $6,000 and $13,000, respectively, of interest income accretion from the acquisition of loans. Also included in net interest income for the quarters ended September 30, 2025, June 30, 2025 and September 30, 2024 are interest recoveries of $64,000, $19,000 and $79,000, respectively.

Investar’s net interest margin was 3.16% for the quarter ended September 30, 2025, compared to 3.03% for the quarter ended June 30, 2025 and 2.67% for the quarter ended September 30, 2024. The increase in net interest margin for the quarter ended September 30, 2025 compared to the quarter ended June 30, 2025 was driven by an eight basis point increase in the yield on interest-earning assets and a two basis point decrease in the overall cost of funds. The increase in net interest margin for the quarter ended September 30, 2025 compared to the quarter ended September 30, 2024 was driven by a 50 basis point decrease in the overall cost of funds, primarily brokered time deposits, time deposits and short-term borrowings.

The yield on interest-earning assets was 5.53% for the quarter ended September 30, 2025, compared to 5.45% for the quarter ended June 30, 2025 and 5.51% for the quarter ended September 30, 2024. The increase in the yield on interest-earning assets compared to the quarter ended June 30, 2025 was primarily attributable to a nine basis point increase in the yield on the loan portfolio. The increase in the yield on interest-earning assets compared to the quarter ended September 30, 2024 was primarily attributable to a 46 basis point increase in the yield on the investment securities portfolio.

Exclusive of the interest income accretion from the acquisition of loans and interest recoveries, adjusted net interest margin was 3.15% for the quarter ended September 30, 2025, compared to 3.02% for the quarter ended June 30, 2025 and 2.66% for the quarter ended September 30, 2024. The adjusted yield on interest-earning assets was 5.52% for the quarter ended September 30, 2025 compared to 5.44% and 5.50% for the quarters ended June 30, 2025 and September 30, 2024, respectively. Refer to the Reconciliation of Non-GAAP Financial Measures tables for a reconciliation of GAAP to non-GAAP metrics.

The cost of deposits decreased two basis points to 3.04% for the quarter ended September 30, 2025 compared to 3.06% for the quarter ended June 30, 2025 and decreased 41 basis points compared to 3.45% for the quarter ended September 30, 2024. The decrease in the cost of deposits compared to the quarter ended June 30, 2025 resulted primarily from both a lower average balance of, and a decrease in rates paid on, brokered time deposits and a decrease in rates paid on time deposits, partially offset by both a higher average balance of, and an increase in rates paid on, interest-bearing demand deposits. The decrease in the cost of deposits compared to the quarter ended September 30, 2024 resulted from both a lower average balance of, and a decrease in rates paid on, brokered time deposits and time deposits, partially offset by both a higher average balance of, and an increase in rates paid on, interest-bearing demand deposits. 

The cost of short-term borrowings decreased 20 basis points to 2.93% for the quarter ended September 30, 2025 compared to 3.13% for the quarter ended June 30, 2025 and decreased 166 basis points compared to 4.59% for the quarter ended September 30, 2024. The decrease in the cost of short-term borrowings compared to the quarter ended June 30, 2025 resulted primarily from reduced utilization of short-term Federal Home Loan Bank (“FHLB”) advances during the third quarter of 2025. Beginning in the second quarter of 2023, the Bank began utilizing the Bank Term Funding Program (“BTFP”) to secure fixed rate funding for up to a one-year term and reduce short-term FHLB advances, which are priced daily. The Bank previously utilized this source of funding due to its lower rate as compared to FHLB advances, the ability to prepay the obligations without penalty, and as a means to lock in funding. During the fourth quarter of 2024, the Bank repaid all of the remaining $109.0 million in borrowings under the BTFP, which had a weighted average rate of 4.76%. The decrease in the cost of short-term borrowings for the quarter ended September 30, 2025 compared to the quarter ended September 30, 2024 resulted primarily from lower average borrowings due primarily to the paydown of borrowings under the BTFP and a lower current rate on short-term FHLB advances compared to borrowings under the BTFP. Average long-term debt increased $13.6 million in the third quarter of 2025 compared to the prior-year quarter primarily due to the utilization of long-term FHLB advances, partially offset by the redemption of $20 million in principal amount of subordinated debt during the fourth quarter of 2024.

The overall cost of funds for the quarter ended September 30, 2025 decreased two basis points to 3.11% compared to 3.13% for the quarter ended June 30, 2025 and decreased 50 basis points compared to 3.61% for the quarter ended September 30, 2024. The decrease in the cost of funds for the quarter ended September 30, 2025 compared to the quarter ended June 30, 2025 resulted primarily from a decrease in the cost of deposits and a decrease in the average balance and cost of short-term borrowings, discussed above. The decrease in the cost of funds for the quarter ended September 30, 2025 compared to the quarter ended September 30, 2024 resulted primarily from decreases in the average balance and cost of short-term borrowings and a decrease in the cost of deposits, partially offset by a higher average balance of deposits, discussed above.

Noninterest Income

Noninterest income for the third quarter of 2025 totaled $3.0 million, an increase of $0.4 million, or 13.6%, compared to the second quarter of 2025 and a decrease of $0.6 million, or 15.8%, compared to the third quarter of 2024.

The increase in noninterest income compared to the quarter ended June 30, 2025 was primarily driven by a $0.2 million increase in the change in fair value of equity securities, a $0.1 million increase in gain on sale of other real estate owned, and a $0.1 million increase in other operating income. The increase in other operating income was primarily attributable to a $0.4 million increase in distributions from other investments and a $0.1 million increase in the change in net asset value of other investments, partially offset by a decrease of $0.3 million of income from insurance proceeds, which were received during the second quarter 2025 for damages to a property recorded in other real estate owned and a $0.1 million decrease in derivative fee income.

The decrease in noninterest income compared to the quarter ended September 30, 2024 was primarily attributable to $1.1 million in income from a legal settlement recorded in the third quarter of 2024 related to one loan relationship that became impaired in the third quarter of 2021 as a result of Hurricane Ida, partially offset by a $0.4 million increase in other operating income and a $0.1 million increase in gain on sale of other real estate owned. The increase in other operating income was primarily attributable to a $0.4 million increase in distributions from other investments. 

Noninterest Expense

Noninterest expense for the third quarter of 2025 totaled $16.5 million, a decrease of $0.2 million, or 1.0%, compared to the second quarter of 2025, and an increase of $0.3 million, or 2.1%, compared to the third quarter of 2024. 

The decrease in noninterest expense for the quarter ended September 30, 2025 compared to the quarter ended June 30, 2025 was primarily driven by a $0.2 million decrease in other operating expenses and a $0.1 million decrease in data processing, partially offset by a $0.1 million increase in acquisition expense. The decrease in other operating expenses resulted primarily from a $0.2 million decrease in write down of other real estate owned. The decrease in data processing resulted from our negotiation of more favorable contract terms with our vendor.

The increase in noninterest expense for the quarter ended September 30, 2025 compared to the quarter ended September 30, 2024 was primarily driven by a $0.3 million increase in salaries and employee benefits and a $0.2 million increase in acquisition expense, partially offset by a $0.1 million decrease in other operating expenses and a $0.1 million decrease in depreciation and amortization. The increase in salaries and employee benefits was primarily due to investment in people with an emphasis on our Texas markets to remix and strengthen our balance sheet and an increase in health insurance claims. The increase in acquisition expense was related to the Wichita Falls transaction announced on July 1, 2025. The decrease in other operating expenses resulted from $0.3 million in collection and repossession expenses recorded in the third quarter of 2024 related to the income from the legal settlement, discussed above, and a $0.1 million decrease in Federal Deposit Insurance Corporation (“FDIC”) assessments, partially offset by a $0.1 million increase in write down of other real estate owned and a $0.1 million increase in branch services expense.

Taxes

Investar recorded income tax expense of $1.3 million for the quarter ended September 30, 2025, which equates to an effective tax rate of 17.3%, compared to effective tax rates of 17.2% and 12.7% for the quarters ended June 30, 2025 and September 30, 2024, respectively. The third quarter 2024 effective tax rate reflects a revision to our estimated 2024 annual effective tax rate to account for our projected increase in nontaxable income from bank owned life insurance in the fourth quarter of 2024 of approximately $3.1 million upon receipt of death benefit proceeds.

Basic and Diluted Earnings Per Common Share

Investar reported basic and diluted earnings per common share of $0.57 and $0.54, respectively, for the quarter ended September 30, 2025, compared to basic and diluted earnings per common share of $0.46 for the quarter ended June 30, 2025, and basic and diluted earnings per common share of $0.55 and $0.54, respectively, for the quarter ended September 30, 2024.

About Investar Holding Corporation

Investar, headquartered in Baton Rouge, Louisiana, provides full banking services, excluding trust services, through its wholly-owned banking subsidiary, Investar Bank, National Association. The Bank currently operates 29 branch locations serving Louisiana, Texas, and Alabama. At September 30, 2025, the Bank had 326 full-time equivalent employees and total assets of $2.8 billion.

Non-GAAP Financial Measures

This press release contains financial information determined by methods other than in accordance with generally accepted accounting principles in the United States of America, or GAAP. These measures and ratios include “tangible common equity,” “tangible assets,” “tangible common equity to tangible assets,” “tangible book value per common share,” “core noninterest income,” “core earnings before noninterest expense,” “core noninterest expense,” “core earnings before income tax expense,” “core income tax expense,” “core earnings,” “core earnings available to common shareholders,” “core efficiency ratio,” “core return on average assets,” “core return on average common equity,” “core basic earnings per common share” and “core diluted earnings per common share.” We also present certain average loan, yield, net interest income and net interest margin data adjusted to show the effects of excluding interest recoveries and interest income accretion from the acquisition of loans. Management believes these non-GAAP financial measures provide information useful to investors in understanding Investar’s financial results, and Investar believes that its presentation, together with the accompanying reconciliations, provides a more complete understanding of factors and trends affecting Investar’s business and allows investors to view performance in a manner similar to management, the entire financial services sector, bank stock analysts and bank regulators. These non-GAAP measures should not be considered a substitute for GAAP basis measures and results, and Investar strongly encourages investors to review its consolidated financial statements in their entirety and not to rely on any single financial measure. Because non-GAAP financial measures are not standardized, it may not be possible to compare these financial measures with other companies’ non-GAAP financial measures having the same or similar names. A reconciliation of the non-GAAP financial measures disclosed in this press release to the comparable GAAP financial measures is included at the end of the financial statement tables.

Forward-Looking and Cautionary Statements

General Forward-Looking and Cautionary Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that reflect Investar’s current views with respect to, among other things, future events and financial performance, including the potential impacts of its strategies and the anticipated closing and impacts of the Wichita Falls transaction. Investar generally identifies forward-looking statements by terminology such as “outlook,” “believes,” “expects,” “potential,” “continues,” “may,” “will,” “could,” “should,” “seeks,” “approximately,” “predicts,” “intends,” “plans,” “estimates,” “anticipates” or the negative version of those words or other comparable words.

Any forward-looking statements contained in this press release are based on the historical performance of Investar and its subsidiaries or on Investar’s current plans, estimates and expectations. The inclusion of this forward-looking information should not be regarded as a representation by Investar that the future plans, estimates or expectations by Investar will be achieved. Such forward-looking statements are subject to various risks and uncertainties and assumptions relating to Investar’s operations, financial results, financial condition, business prospects, growth strategy and liquidity. If one or more of these or other risks or uncertainties materialize, or if Investar’s underlying assumptions prove to be incorrect, Investar’s actual results may vary materially from those indicated in these statements. Investar does not undertake any obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future developments or otherwise. A number of important factors could cause actual results to differ materially from those indicated by the forward-looking statements. These factors include, but are not limited to, the following, any one or more of which could materially affect the outcome of future events:

Forward-Looking and Cautionary Statements Relating to the Pending Wichita Falls Transaction

With respect to the pending Wichita Falls transaction, forward-looking statements include, but are not limited to, statements about the potential benefits of the transaction, including future financial and operating results; statements about Investar’s plans, objectives, expectations and intentions; statements about the expected timing of completion of the proposed merger; and other statements that are not historical facts. Important factors that could cause actual results to differ materially from those indicated by such forward-looking statements include risks and uncertainties relating to: (i) the ability to obtain the requisite shareholder approvals; (ii) the risk that Investar may be unable to obtain governmental and regulatory approvals required to consummate the proposed merger, or required governmental and regulatory approvals may delay the merger or result in the imposition of conditions that could cause the parties to abandon the merger; (iii) the risk that a condition to closing may not be satisfied; (iv) the timing to consummate the proposed merger; (v) the risk that the businesses will not be integrated successfully; (vi) the risk that the cost savings and any other synergies from the proposed merger may not be fully realized or may take longer to realize than expected; (vii) disruption from the proposed merger making it more difficult to maintain relationships with customers, employees or vendors; and (viii) the diversion of management time on merger-related issues.

These factors should not be construed as exhaustive. Additional information on these and other risk factors can be found in Part I Item 1A. “Risk Factors” and in the “Cautionary Note Regarding Forward-Looking Statements” in Part II Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Investar’s Annual Report on Form 10-K for the year ended December 31, 2024 filed with the Securities and Exchange Commission (“SEC”) and in subsequent filings with the SEC. Additional information and risk factors related to the Wichita Falls transaction can be found in the definitive proxy statement/prospectus filed with the SEC on September 23, 2025.

Additional Information about the Proposed Merger and Where to Find It

In connection with the proposed merger, Investar has filed with the SEC a registration statement on Form S-4 (the “Form S-4”) that included a joint proxy statement of Investar and Wichita Falls and a prospectus of Investar with respect to the shares of Investar common stock to be issued in the proposed merger (the “proxy statement/prospectus”). The registration statement was declared effective by the SEC on September 23, 2025. The definitive proxy statement/prospectus was also mailed to stockholders of each of Investar and Wichita Falls on or about September 23, 2025. Investar may also file other relevant documents with the SEC regarding the proposed merger. This press release is not a substitute for the Form S-4 or proxy statement/prospectus or any other document that Investar may file with the SEC. Investors and security holders are urged to read the Form S-4, the proxy statement/prospectus and any other relevant documents that may be filed with the SEC, as well as any amendments or supplements to these documents, carefully and in their entirety because they contain or will contain important information about the proposed merger. Investors and security holders may obtain free copies of the Form S-4 and the proxy statement/prospectus and other documents containing important information about Investar, Wichita Falls and the proposed merger, once such documents are filed with the SEC through the website maintained by the SEC at https://www.sec.gov. Copies of the documents filed with, or furnished to, the SEC by Investar will be available free of charge in the “Investors” section of Investar’s website at www.investarbank.com. The information included on, or accessible through, Investar’s website is not incorporated by reference into this communication.

Participants in the Solicitation

Investar and Wichita Falls and their respective directors and officers may be deemed to be participants in the solicitation of proxies from their respective shareholders in connection with the proposed merger. Information about Investar’s directors and executive officers and their ownership of Investar’s securities is set forth in Investar’s filings with the SEC, including the definitive proxy statement/prospectus and our most recent Annual Report on Form 10-K filed with the SEC. To the extent that holdings of Investar’s securities have changed since the amounts printed in the definitive proxy statement/prospectus or our most recent Annual Report on Form 10-K, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC. Additional information regarding the interests of those persons and other persons who may be deemed participants in the proposed merger may be obtained by reading the proxy statement/prospectus regarding the proposed merger. You may obtain free copies of these documents as described in the preceding paragraph.

No Offer or Solicitation

The information contained in this press release is not an offer to sell or the solicitation of an offer to buy any securities of Investar.

For further information contact:

Investar Holding Corporation

John Campbell

Executive Vice President and Chief Financial Officer

(225) 227-2215

John.Campbell@investarbank.com