Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 30

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 30
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 to how such shareholder should vote or act with respect to the merger or any
matter relating thereto. PNC FIG Advisory’s opinion does not address the relative merits of the merger as compared to any other transaction or business strategy in which ESSA might engage or the merits of the underlying decision by ESSA to
engage in the merger. See the section entitled “The Merger—Opinion of ESSA’s Financial Advisor” beginning on page 133 for more information relating to PNC FIG Advisory’s opinion.

15

Interests of Certain CNB Directors and Executive Officers in the Merger(Page 145) In considering the information contained in this joint proxy statement/prospectus, you should be aware that CNB’s directors and executive officers have interests in the merger that are different from, or in addition to, the interests of CNB shareholders generally. The CNB Board of Directors was aware of these interests and considered them, among other things, in approving the merger. These interests include, among other things:

| • |     | the expectation that each current member of the CNB Board of Directors will continue to serve as a director of 
 the board of directors of the combined company; and                                                            |

| • |     | the expectation that each current CNB executive officer will continue in his or her role as an executive officer 
 of the combined company.                                                                                         |

See the section entitled “The Merger—Interests of Certain CNB Directors and Executive Officers in the Merger” beginning on page 145 for a discussion of these interests. Interests of Certain ESSA Directors and Executive Officers in the Merger(Page 145) In considering the information contained in this joint proxy statement/prospectus, you should be aware that ESSA’s directors and executive officers have interests in the merger that are different from, or in addition to, the interests of ESSA shareholders generally. The ESSA Board of Directors was aware of these interests and considered them, among other things, in approving the merger. These interests include, among other things:

| • |     | Each ESSA restricted stock award outstanding immediately prior to the effective time of the merger will fully                                                                                                                        
 vest, and such awards will be exchanged for the merger consideration (less applicable taxes required to be withheld) and will be treated as issued and outstanding shares of ESSA common stock for purposes of the merger agreement; |

| • |     | Each ESSA performance-based cash-settled award outstanding immediately prior to the effective