Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 38

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 38
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 combined company;                                                                                         |

| • |     | market assessments of the likelihood that the merger will be completed; |

| • |     | interest rates, general market and economic conditions and other factors generally affecting the market price of 
 CNB common stock;                                                                                                |

| • |     | the actual or perceived impact of U.S. monetary and fiscal policies; |

| • |     | federal, state and local legislation, governmental regulation and legal developments in the business in which CNB 
 operates; and                                                                                                     |

| • |     | other factors beyond CNB’s control, including those described or referred to elsewhere in this “Risk 
 Factors” section.                                                                                    |

The market price of CNB common stock at the closing of the merger may vary from its price on the date the merger agreement was executed, on the date of this joint proxy statement/prospectus and on the dates of CNB’s and ESSA’s shareholder meetings. As a result, the market value of the consideration for the merger represented by the exchange ratio also will vary. Therefore, while the number of shares of CNB common stock to be issued per share of ESSA common stock is fixed, ESSA shareholders cannot be sure of the market value of the consideration they will receive upon completion of the merger. As a result, ESSA shareholders are urged to obtain current market quotations for CNB common stock before voting their shares at the ESSA special meeting . Shareholders may be unable to timely sell shares after completion of the merger. There will be a time period between the completion of the merger and the time at which former ESSA shareholders actually receive their shares of CNB common stock. Until shares are received, former ESSA shareholders may not be able to sell their CNB shares in the open market and, therefore, may not be able to avoid losses resulting from any decrease, or secure gains resulting from any increase, in the trading price of CNB common stock during this period. 21

The market price of CNB common stock may decline as a result of the merger and the market price of CNB common stock after the consummation of the merger may be affected by factors different from those affecting the price of CNB common stock or ESSA common stock before the merger.

The market price of CNB common stock may decline as a result of the merger if CNB does not achieve the perceived benefits of the merger or the effect of the
merger on CNB’s financial results is not consistent with the