Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 204

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 204
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 days ending on the third business day immediately prior to the closing date of the merger, rounded to the nearest whole cent. Exchange of Certificates; Dividends Before the effective time of the merger, CNB will cause to be delivered to the exchange agent certificates, or at CNB’s option, evidence of shares in book-entry form, representing the shares of CNB common stock to be issued in the merger. In addition, CNB will deliver to the exchange agent an aggregate amount of cash consideration sufficient to pay the estimated amount of cash to be paid to ESSA shareholders in lieu of fractional shares of CNB common stock. CNB has selected Equiniti Trust Company, LLC to act as exchange agent in connection with the merger. Promptly after the effective time of the merger, the exchange agent will mail to each ESSA shareholder of record at the effective time of the merger a notice advising such holder of the effectiveness of the merger, including a form of letter of transmittal (in a form satisfactory to CNB and ESSA) containing instructions for use in surrendering the shareholder’s ESSA stock certificates. When such ESSA shareholders deliver their ESSA stock certificates to the exchange agent with a properly completed and duly executed letter of transmittal and any other required documents, their ESSA stock certificates will be cancelled and in exchange, such ESSA shareholders will receive:

| • |     | a CNB stock certificate, or at the election of CNB, a statement reflecting shares issued in book-entry form,                     
 representing the number of whole shares of CNB common stock that they are entitled to receive under the merger agreement; and/or |

| • |     | a check representing the amount of cash that they are entitled to receive in lieu of any fractional shares. |

ESSA shareholders of record who hold ESSA common stock in book-entry form will not be required to deliver a share certificate or an executed letter of transmittal. Promptly following the completion of the merger, shares of ESSA common stock held in book-entry form will automatically be exchanged for the merger consideration in the form described above. 157

ESSA shareholders are not entitled to receive any dividends or other distributions on CNB common stock with a record date after the effective time of the merger until they have surrendered their ESSA stock certificates in exchange for a CNB stock certificate. After the surrender of their ESSA stock certificates or the conversion of their book-entry shares, as applicable, ESSA shareholders