UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

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FORM 8-K

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CURRENT REPORT
Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

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Date of Report (Date of earliest event reported): December 23, 2025

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NATIONAL BANK HOLDINGS CORPORATION
(Exact name of registrant as specified in its charter)

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7800 East Orchard Road, Suite 300, Greenwood Village, Colorado 80111
(Address of principal executive offices) (Zip Code)

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303-892-8715
(Registrant’s telephone, including area code)

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Not Applicable
(Former name or former address, if changed since last report.)

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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

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☐Written Communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

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☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

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☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

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☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933(§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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Emerging growth company ☐

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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. ☐

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Item 8.01 Other Events

On December 23, 2025, National Bank Holdings Corporation (“NBHC”) issued a press release announcing the receipt of regulatory approvals from the Board of Governors of the Federal Reserve System and the State of Colorado Division of Banking in connection with the previously announced merger of Vista Bancshares, Inc., a Texas Corporation (“Vista”) and holding company for Vista Bank, with and into NBHC, with NBHC continuing as the surviving corporation, and Vista Bank with and into NBH Bank, with NBH Bank continuing as the surviving bank (collectively, the “Mergers”), pursuant to the Agreement and Plan of Merger (the “Merger Agreement”), dated as of September 15, 2025, by and between NBHC, Vista, and Bryan Wick, solely in his capacity as the shareholders’ representative.

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All required regulatory approvals to complete the Mergers have now been received. In addition, the transaction was approved by Vista’s shareholders on December 19, 2025. NBHC and Vista expect to close the Mergers on January 7, 2026, subject to the satisfaction or waiver of the remaining customary closing conditions set forth in the Merger Agreement.

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A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

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Item 9.01. Financial Statements and Exhibits.

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(d) Exhibits

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Cautionary Note Regarding Forward-Looking Statements

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This communication contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 related to, among other things, NBHC’s strategy, plans, beliefs, goals, intentions, and expectations regarding the proposed transaction; its ability to achieve its financial and other strategic goals; the expected timing of completion of the proposed transaction; the expected cost savings, synergies and other anticipated benefits from the proposed transaction; and other statements that are not historical facts. Forward-looking statements typically contain words such as “anticipate,” “believe,” “potential,” “will,” “estimate,” “plans,” “approximately,” “opportunity,” “expect,” “position,” “pro forma,” “proposed,” “intend,” “scheduled” or similar expressions. Forward-looking statements involve certain important risks, uncertainties and other factors, any of which could cause actual results to differ materially from those in such statements. Such factors include, without limitation, the “Risk Factors” referenced in NBHC’s most recent Annual Report on Form 10-K for the year ended December 31, 2024, in its subsequent Quarterly Reports on Form 10-Q, including for the quarter ended September 30, 2025, other risks and uncertainties listed from time to time in NBHC’s reports and documents filed with the U.S. Securities and Exchange Commission (the “SEC”) each of which is filed with the SEC and available in the “Financials” section of NBHC’s website at https://www.nationalbankholdings.com, under the heading “SEC Filings” and in other documents NBHC files with the SEC.

Additional factors that could cause results actual results to differ materially from those in forward-looking statements include: the ability to obtain required approvals or meet other closing conditions to the merger on the expected terms and schedule; the acquisition may not be timely completed, if at all; difficulties and delays in integrating NBH Bank’s and Vista Bank’s businesses or fully realizing cost savings and other benefits; the occurrence of any event, change or other circumstances that could give rise to the right of one or both of NBHC and Vista to terminate the merger agreement; the outcome of any legal proceedings that may be instituted against NBHC or Vista; the possibility that the transaction may be more expensive to complete than anticipated, including as a result of unexpected factors or events; business disruption prior to the completion of the acquisition or following the proposed transaction; NBHC’s ability to execute its business strategy; reputational risks and risks relating to the reaction of NBHC’s and Vista’s customers or employees to the proposed transaction, including the effects on their respective ability to attract or retain customers and key personnel; diversion of management time on acquisition-related issues; the dilution caused by NBHC’s issuance of additional shares of its capital stock in connection with the transaction; economic, market, operational, liquidity, credit and interest rate risks associated with NBHC’s business; business and economic conditions along with external events both generally and in the financial services industry; susceptibility to credit risk and fluctuations in the value of real estate and other collateral securing a significant portion of NBHC’s loan portfolio, including with regards to real estate acquired through foreclosure, and the accuracy of appraisals related to such real estate; the allowance for credit losses and fair value adjustments may be insufficient to absorb losses in NBHC’s loan portfolio; NBHC’s ability to maintain sufficient liquidity to meet the requirements of deposit withdrawals and other business needs; changes impacting monetary supply and the businesses of NBHC’s clients and counterparties, including levels of market interest rates, inflation, currency values, monetary and fiscal policies, and the volatility of trading markets; changes in the fair value of NBHC’s investment securities and the ability of companies in which we invest to commercialize their technology or product concepts; the loss of certain executive officers and key personnel; any service interruptions, cyber incidents or other breaches relating to NBHC’s technology systems, security systems or infrastructure or those of NBHC’s third-party providers; the occurrence of fraud or other financial crimes within NBHC’s business; competition from other financial institutions and financial services providers and the effects of disintermediation within the banking business including consolidation within the industry; changes to federal government lending programs like the Small Business Administration’s Preferred Lender Program and the Federal Housing Administration’s insurance programs, including the impact of a government shutdown of such programs; impairment of NBHC’s mortgage servicing rights, disruption in the secondary market for mortgage loans, declines in real estate values, or being required to repurchase mortgage loans or reimburse investors; developments in technology, such as artificial intelligence, the success of NBHC’s digital growth strategy, and NBHC’s ability to incorporate innovative technologies in its business and provide products and services that satisfy NBHC’s clients’ expectations for convenience and security; NBHC’s ability to execute its organic growth and acquisition strategies; the accuracy of projected operating results for assets and businesses we acquire as well as NBHC’s ability to drive organic loan growth to replace loans in its existing portfolio with comparable loans as loans are paid down; changes to federal, state and local laws and regulations along with executive orders applicable to NBHC’s business, including tax laws; NBHC’s ability to comply with and manage costs related to extensive government regulation and supervision, including current and future regulations affecting bank holding companies and depository institutions; the application of any increased assessment rates imposed by the Federal Deposit Insurance Corporation; claims or legal action brought against NBHC by third parties or government agencies; and other factors that may affect the future results of NBHC. NBHC can give no assurance that any goal or plan or expectation set forth in forward-looking statements can be achieved and readers are cautioned not to place undue reliance on such statements. Forward-looking statements speak only as of the date they are made and are based on information available at the time. NBHC does not intend, and assumes no obligation, to update any forward-looking statement to reflect events or circumstances after the date on which the statement is made or to reflect the occurrence of unanticipated events or circumstances, except as required by applicable law.

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Annualized, pro forma, projected, and estimated numbers are used for illustrative purposes only, are not forecasts and may not reflect actual results. Except to the extent required by applicable law or regulation, NBHC disclaims any obligation to revise or publicly release any revision or update to any of the forward-looking statements included herein to reflect events or circumstances that occur after the date on which such statements were made.

As forward-looking statements involve significant risks and uncertainties, caution should be exercised against placing undue reliance on such statements.

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SIGNATURE

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Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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Date: December 23, 2025

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