Prosperity Bancshares Files 8-K Amendment with Pro Forma Merger Info

What Happened

• Prosperity Bancshares, Inc. (filed Aug. 31, 2026) submitted an amendment to its prior Form 8-K to include pro forma financial information related to the Merger between Prosperity and Stellar. The amendment states the pro forma figures are provided as required by Form 8-K and are informational only.

Key Details

• Amendment filed on August 31, 2026, to supplement the Original Form 8-K.
• Pro forma financial information is presented for informational purposes only and "does not purport to represent the actual results" if the companies had been combined during the period shown.
• The pro forma data "is not intended to project the future results of operations" of the combined company after the Merger.
• Except for the added pro forma information, the amendment does not change or update disclosures in the Original Form 8-K and should be read together with that filing.

Why It Matters

• Pro forma financials can help investors see how the companies would have looked historically if combined, but this filing warns they are illustrative only and should not be treated as actual past performance or a forecast of future results.
• Investors should review the Original Form 8-K alongside this amendment to get the full context on the Merger and to understand any transaction terms, historical results, or risks disclosed previously.