Prosperity Bancshares (NYSE: PB) furnishes Q1 2026 results in 8-K

Rhea-AI Filing Summary

Prosperity Bancshares, Inc. furnished a press release reporting its financial results for the quarter ended March 31, 2026. The press release is attached as Exhibit 99.1 to this Form 8-K and the cover page interactive XBRL is included as Exhibit 104.

Key Terms

Form 8-K, Item 2.02, Exhibit 99.1, Inline XBRL

4 terms

Form 8-K regulatory

"FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d)"

A Form 8-K is a report that companies file with the government to share important news quickly, such as changes in leadership, major business deals, or financial updates. It matters because it helps investors stay informed about significant events that could affect the company's value or stock price.

Item 2.02 regulatory

"Item 2.02 Results of Operations and Financial Condition"

Exhibit 99.1 regulatory

"Press Release issued by Prosperity Bancshares, Inc. dated April 29, 2026."

Exhibit 99.1 is a label used in regulatory filings to identify a specific attached document, most often a company press release or investor presentation filed with securities regulators. For investors it matters because it marks an official, contemporaneous source of information directly tied to a filing—like the original news article pinned to a legal record—so traders and analysts treat it as an authoritative statement that can move a stock or clarify a company’s situation.

Inline XBRL technical

"Cover Page Interactive Data File (embedded within the Inline XBRL document)"

Inline XBRL is a file format for financial filings that embeds machine-readable data tags directly inside the human-readable report, so the same document can be read by people and parsed by software. For investors it makes extracting, comparing and verifying financial numbers faster and more reliable—like a grocery list where each item also has a barcode—reducing manual errors and speeding up analysis.

Filed by Prosperity Bancshares, Inc.

pursuant to Rule 425 under the Securities Act of 1933

and deemed filed pursuant to Rule 14a-12

under the Securities Exchange Act of 1934

Subject Company: Stellar Bancorp, Inc.

Commission File Number: 001-38280

Date: April 29, 2026

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): April 29, 2026

PROSPERITY BANCSHARES, INC.

(Exact name of registrant as specified in its charter)

Texas	001-35388	74-2331986
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)

4295 San Felipe

Houston, Texas 77027

(Address of principal executive offices including zip code)

Registrant's telephone number, including area code: (281) 269-7199

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 $1.00 per share		PB		New York Stock Exchange, Inc.

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

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. ☐

Item 2.02 Results of Operations and Financial Condition.

On April 29, 2026, Prosperity Bancshares, Inc. publicly disseminated a press release announcing its financial results for the first quarter ended March 31, 2026. A copy of the press release is furnished as Exhibit 99.1 hereto and incorporated herein by reference.

As provided in General Instruction B.2 to Form 8-K, the information furnished in Item 2.02 and Exhibit 99.1 of this Current Report on Form 8-K shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and such information shall not be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01 Financial Statements and Exhibits.

(d)Exhibits. The following is furnished as an exhibit to this Current Report on Form 8-K:

Exhibit Number		Description of Exhibit
99.1		Press Release issued by Prosperity Bancshares, Inc. dated April 29, 2026.
104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

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.

		PROSPERITY BANCSHARES, INC. (Registrant)
Dated: April 29, 2026		By:	/s/ Charlotte M. Rasche
			Charlotte M. Rasche
			Executive Vice President and General Counsel

FAQ

Where can I find Prosperity Bancshares (STEL) Q1 2026 financial results?

The company furnished a press release announcing results for the quarter ended March 31, 2026, attached as Exhibit 99.1 to the Form 8-K filed April 29, 2026. The press release contains the disclosed financial information.

Does the Form 8-K filing for Prosperity Bancshares (STEL) include machine-readable data?

Yes. The filing includes a Cover Page Interactive Data File as Exhibit 104, which is embedded within the Inline XBRL document for the furnished press release and related interactive data.

Is the April 29, 2026 press release legally "filed" with the SEC for Prosperity Bancshares (STEL)?

No. The Company states that the information furnished in Item 2.02 and Exhibit 99.1 is "furnished" and shall not be deemed "filed" under Section 18 of the Exchange Act, per the Form 8-K language included in the report.

What period do the results in the Prosperity Bancshares (STEL) press release cover?

The press release furnished as Exhibit 99.1 announces financial results for the quarter ended March 31, 2026. Additional period-specific figures, if any, are contained in the attached press release.

Who signed the Form 8-K filed by Prosperity Bancshares (STEL)?

The Form 8-K was signed on behalf of Prosperity Bancshares, Inc. by Charlotte M. Rasche, Executive Vice President and General Counsel, as shown on the signature block of the filing.