Company: CCNE
Filing Date: 2025-04-15
Form Type: 425
Source: 0001193125-25-080836
Chunk: 1

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-04-15
Form: 425
Chunk 1
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) or Rule 12b-2of the Securities Exchange Act of 1934 (§240.12b-2of 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. ☐

| Item 7.01. | Regulation FD Disclosure. |

CNB Financial Corporation (the “Corporation”) (NASDAQ: CCNE), the parent company of CNB Bank, will conduct a presentation on April 15, 2025 at its 2025 Annual Meeting of Shareholders. The presentation will also be posted on the Corporation’s website at https://cnbbank.q4ir.com/events-and-presentations/default.aspx.A copy of the presentation is furnished hereto as Exhibit 99.1 and is hereby incorporated by reference herein. The information contained in this Item 7.01, including Exhibit 99.1 attached hereto, shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of such section, nor shall such information or exhibit be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

| Item 9.01. | Financial Statements and Exhibits |

| (d) | Exhibits |

| Exhibit 
 Number  
 99.1    |     | Description                                                                 
 Investor Presentation, dated April 15, 2025                                 |
|:--------|:----|:----------------------------------------------------------------------------|
| 104     |     | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

SIGNATURE 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.

| Date: April 15, 2025 |     | CNB FINANCIAL CORPORATION 
 By:                       |     | /s/ Tito L. Lima |
|:---------------------|:----|:--------------------------|:----|:-----------------|
|                      |     |                           |     | Tito L. Lima     |
|                      |     |                           |     | Treasurer        |