Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 19

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 19
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 three ways you can change your vote at any time after you have submitted your proxy and before 
 your proxy is voted at your shareholder meeting:                                                              |

| • |     | you may deliver a written notice bearing a date later than the date of your proxy card at the address listed 
 below, stating that you revoke your proxy;                                                                   |

| • |     | you may submit a new signed proxy card bearing a later date (if you submitted your proxy by internet or by 
 telephone, you can vote again by internet or telephone); or                                                |

| • |     | you may attend your shareholder meeting and vote online during the meeting, although attendance at the 
 shareholder meeting will not, by itself, revoke a proxy.                                               |

You should send any notice of revocation to the appropriate company at:

| CNB Financial Corporation           
 1 South Second Street               
 PO Box 42                           
 Clearfield, Pennsylvania 16830      
 Attention: Anna K. “Katie” Andersen 
 Secretary                           |     | ESSA Bancorp, Inc.              
 200 Palmer Street PO Box L      
 Stroudsburg, Pennsylvania 18360 
 Attention: Stephanie Lefferson  
 Corporate Secretary             |

7

If you hold your shares of ESSA common stock or CNB common stock in “street name” through a bank, broker, trustee or other nominee, you must follow the directions you receive from your bank, broker, trustee or other nominee to change your voting instructions.

| Q: | What if I hold stock of both CNB and ESSA? |

| A: | If you hold shares of both CNB and ESSA, you will receive two separate packages of proxy materials. A vote as                                                                                                                                            
 an ESSA shareholder for any proposals to be considered at the ESSA special meeting will not constitute a vote as a CNB shareholder for any proposals to be considered at the CNB annual meeting, and vice versa. Therefore, please sign, date and return 
 all proxy cards that you receive, whether from CNB or ESSA, or vote via the internet or by telephone.                                                                                                                                                    |

| Q: | What happens if I sell my shares of ESSA common stock after the record date but before the ESSA special 
 meeting?                                                                                                |

| A: | If you sell or otherwise transfer your shares of ESSA common stock after the record date, but before the date                                                                                                                                      
 of the ESSA special meeting, you will retain your right to vote at the ESSA special