Company: CCNE
Filing Date: 2025-02-20
Form Type: S-4
Source: 0001193125-25-030821
Chunk: 9

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-02-20
Form: S-4
Chunk 9
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 Secretary                                       
 (814) 765-9621 www.cnbbank.bank                 |     | ESSA Bancorp, Inc. 200 Palmer Street PO Box L Stroudsburg, Pennsylvania 18360 Attention: Stephanie Lefferson Corporate Secretary (570) 422-0182 www.essabank.com |

To obtain timely delivery, you must request the information no later than , 2025. For a more detailed description of the information incorporated by reference into the accompanying joint proxy statement/prospectus and how you may obtain it, see the section entitled “Where You Can Find More Information” beginning on page 185. The accompanying joint proxy statement/prospectus provides a detailed description of the merger and the merger agreement. We urge you to read the joint proxy statement/prospectus, including any documents incorporated by reference into the joint proxy statement/prospectus, and its annexes carefully and in their entirety. If you have any questions concerning the merger, the other meeting matters or the joint proxy statement/prospectus, or need assistance voting your shares, please contact the appropriate proxy solicitor at the address or telephone number listed below:

| If you are a CNB shareholder:                                                                                        |     | If you are an ESSA shareholder:                                                                                      |
| Alliance Advisors, LLC 200 Broadacres Drive, 3rd Floor Bloomfield, NJ 07003 (833) 215-7302 CCNE@AllianceAdvisors.com |     | Laurel Hill Advisory Group, LLC 2 Robbins Lane, Suite 201 Jericho, New York 11753 (516) 933-3100 info@laurelhill.com |

Please do not send your ESSA stock certificates at this time. You will be sent separate instructions regarding the surrender of your ESSA stock certificates.

<div align='center'>**ABOUT THIS DOCUMENT**</div>

**This joint proxy statement/prospectus, which forms part of a registration statement on Form S-4 (Registration Statement No. 333- ) filed by CNB with the Securities and Exchange Commission (the “SEC”), constitutes a prospectus of CNB for purposes of the Securities Act of 1933, as amended (the “Securities Act”), with respect to the CNB common stock to be issued to ESSA shareholders in exchange for shares of ESSA common stock pursuant to the merger agreement, as such agreement may be amended or modified from time to time. This joint proxy statement/prospectus also constitutes a proxy statement