Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 7

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 7
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FOR” the ESSA adjournment proposal.

By Order of the Board of Directors,

Stephanie Lefferson

Corporate
Secretary

Stroudsburg, Pennsylvania

March 5, 2025

PLEASE DO NOT SEND STOCK CERTIFICATES WITH THE PROXY CARD. YOU WILL BE SENT SEPARATE INSTRUCTIONS REGARDING THE SURRENDER OF YOUR STOCK CERTIFICATES.

ADDITIONAL INFORMATION The accompanying joint proxy statement/prospectus incorporates by reference important business and financial information about CNB and ESSA from documents that are not included in or delivered with the joint proxy statement/prospectus. This information is available to you without charge upon your written or oral request. You can obtain the documents incorporated by reference into this joint proxy statement/prospectus by requesting them in writing or by telephone from the appropriate company at the following addresses and telephone numbers:

| CNB Financial Corporation           
 1 South Second Street               
 PO Box 42                           
 Clearfield, Pennsylvania 16830      
 Attention: Anna K. “Katie” Andersen 
 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 April 8, 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 186. 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@All