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United States

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 24, 2025

ATLANTIC UNION BANKSHARES CORPORATION

(Exact name of registrant as specified in its charter)

Virginia | 001-39325 | 54-1598552
(State or other jurisdiction | (Commission | (I.R.S. Employer
of incorporation) | File Number) | Identification No.)

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4300 Cox Road

Glen Allen, Virginia 23060

(Address of principal executive offices, including Zip Code)

Registrant’s telephone number, including area code: (804) 633-5031

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):

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

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

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

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

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

| ​ |  | ​ |
Title of each class |  | Trading Symbol(s) |  | Name of each exchange on which registered
Common Stock, par value $1.33 per share | ​ | AUB | ​ | New York Stock Exchange
Depositary Shares, Each Representing a 1/400th Interest in a Share of 6.875% Perpetual Non-Cumulative Preferred Stock, Series A | ​ | AUB.PRA | ​ | New York Stock Exchange

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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).

Emerging growth company | ☐

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 2.02 Results of Operations and Financial Condition.

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On July 24, 2025, Atlantic Union Bankshares Corporation (the “Company”) issued a press release announcing its financial results for the second quarter of 2025. A copy of the press release is being furnished as Exhibit 99.1 hereto and is incorporated herein by reference.

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The information disclosed in or incorporated by reference into this Item 2.02, including Exhibit 99.1, is furnished and shall not be deemed filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”).

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Item 7.01 Regulation FD Disclosure.

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Attached as Exhibit 99.2 and incorporated herein by reference is a presentation that the Company will use in connection with a webcast and conference call for investors and analysts at 9:00 a.m. Eastern Time on Thursday, July 24, 2025. This presentation is also available under the Presentations link in the Investor Relations – News & Events section of the Company’s website at https://investors.atlanticunionbank.com.

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The information disclosed in or incorporated by reference into this Item 7.01, including Exhibit 99.2, is furnished and shall not be deemed filed for purposes of Section 18 of the Exchange Act.

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Item 9.01 Financial Statements and Exhibits.

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(d) Exhibits.

Exhibit No. |  | Description of Exhibit
99.1 |  | Press release dated July 24, 2025 regarding the second quarter 2025 results.
99.2 | ​ | Atlantic Union Bankshares Corporation presentation.
104 | ​ | Cover Page Interactive Data File – the cover page iXBRL tags are embedded within the Inline XBRL document

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SIGNATURES

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.

| ATLANTIC UNION BANKSHARES CORPORATION
Date: July 24, 2025 | By: | /s/ Robert M. Gorman |
|  | Robert M. Gorman |
|  | Executive Vice President and |
|  | Chief Financial Officer |
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