Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 218

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 218
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 power of attorney to vote, all of his or her shares of ESSA common stock, as applicable, in favor of the ESSA merger
proposal and any of the transactions contemplated by the merger agreement and against any other acquisition proposal.

Except under limited circumstances,
these directors and executive officers also agreed not to, directly or indirectly, sell, transfer, pledge, assign or otherwise dispose of, or enter into any contract, option, commitment or other arrangement or understanding with respect to the sale,
transfer, pledge, assignment or other disposition of, any such shares. Each voting agreement terminates immediately upon the earlier of the adjournment of the meetings of shareholders of CNB or ESSA, as applicable, called and held pursuant to merger
agreement, or the termination of the merger agreement in accordance with its terms.

As of the record date, these directors and executive officers held
484,412 shares of CNB common stock, which represented approximately 2.31% of the outstanding shares of CNB common stock. As of the record date, these directors and executive officers held 786,575 shares of ESSA common stock, which represented
approximately 7.75% of the outstanding shares of ESSA common stock. These directors and executive officers were not paid any additional consideration in connection with the execution of the voting agreement.

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Additional Agreements CNB and ESSA have also agreed to use their reasonable best efforts in good faith to:

| • |     | take, or cause to be taken, all actions, and to do, or cause to be done, all things necessary, proper or                           
 advisable under applicable laws to consummate the merger and the transactions contemplated thereby as promptly as practicable; and |

| • |     | enable consummation of the transactions contemplated under the merger agreement, including the fulfillment of                 
 conditions set forth in the merger agreement, and cooperate fully with the other parties to the merger agreement to such end. |

The merger agreement also contains covenants relating to cooperation in the preparation of this joint proxy statement/prospectus and additional agreements relating to, among other things, access to information and notice of certain matters. Conditions to Complete the Merger The obligations of CNB and ESSA to consummate the merger are subject to the fulfillment or written waiver, where permissible, of the following conditions:

| • |     | CNB and ESSA having obtained all regulatory approvals, and completed any requirements required by such regulatory                                                                                                                                     
 approvals, required to consummate the transactions