Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 53

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 53
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 performance. Instead, the statements are based on current beliefs, expectations and assumptions regarding the future of the businesses of CNB and ESSA, future plans and strategies, projections, anticipated events and trends, the economy and other future conditions. Therefore, you should not unduly rely on any of these forward-looking statements. All forward-looking statements included in this joint proxy statement/prospectus are based on information available at the time of the joint proxy statement/prospectus. CNB and ESSA are under no obligation to (and expressly disclaim any such obligation to) update or alter these forward-looking statements, whether as a result of new information, future events or otherwise except as required by law. The following factors, among others, could cause actual results to differ materially from the anticipated results or other expectations expressed in the forward-looking statements:

| • |     | the businesses of CNB and ESSA may not be combined successfully, or such combination may take longer to 
 accomplish than expected;                                                                               |

| • |     | the cost savings from the merger may not be fully realized or may take longer than expected to realize; |

| • |     | operating costs, customer loss and business disruption following the merger, including adverse effects on 
 relationships with employees, may be greater than expected;                                               |

| • |     | governmental approvals of the merger may not be obtained, or adverse regulatory conditions may be imposed in 
 connection with governmental approvals of the merger;                                                        |

| • |     | the shareholders of CNB may fail to approve the issuance of CNB common stock in the merger; |

| • |     | the shareholders of ESSA may fail to approve the merger; |

| • |     | the possibility that the merger may be more expensive to complete than anticipated, including as a result of 
 unexpected factors or events;                                                                                |

| • |     | diversion of management’s attention from ongoing business operations and opportunities; |

| • |     | the possibility that the parties may be unable to achieve expected synergies and operating efficiencies in the    
 merger within the expected timeframes or at all and to successfully integrate ESSA’s operations and those of CNB; |

| • |     | such integration may be more difficult, time consuming or costly than expected; |

| • |     | revenues following the proposed transaction may be lower than expected; |

| • |     | CNB’s and ESSA’s success in executing their respective business plans and strategies and managing the 
 risks involved in the foregoing;                                                                      |