Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 212

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 212
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 portion of the net revenues, net income or assets of ESSA or ESSA Bank in a single transaction or series of transactions; |

| • |     | tender offer or exchange offer for 25% or more of the outstanding shares of capital stock or the filing of a 
 registration statement under the Securities Act in connection therewith; or                                  |

| • |     | public announcement by any person of a proposal, plan or intention to do any of the foregoing or any agreement to 
 engage in any of the foregoing.                                                                                   |

If ESSA receives a bona fide unsolicited written acquisition proposal prior to its shareholder meeting that did not result from a breach by ESSA of any of the non-solicitationprovisions in the merger agreement as discussed above, ESSA may participate in discussions or negotiations regarding the unsolicited acquisition proposal or furnish the third party with, or otherwise afford access to the third party of, any information or data with respect to ESSA or any of its subsidiaries or otherwise relating to the acquisition proposal if:

| • |     | the ESSA Board of Directors first determines in good faith, after consultation with its outside legal counsel and                                                                                                                                       
 with respect to financial matters, its outside financial advisor, that such acquisition proposal is or is reasonably likely to lead to a superior proposal and that it must take such actions to comply with its fiduciary duties under applicable law; |

| • |     | ESSA has provided CNB with at least 48 hours’ prior notice of such determination; and |

| • |     | prior to furnishing or affording access to any information or data with respect to ESSA or any of its                                                                                                                                                   
 subsidiaries or otherwise relating to an acquisition proposal, the third party enters into a confidentiality agreement with ESSA containing terms not materially less favorable to ESSA than those contained in its confidentiality agreement with CNB. |

A “superior proposal” means any bona fide written proposal made by a third party to acquire, directly or indirectly, including pursuant to a tender offer, exchange offer, merger, consolidation, business combination, recapitalization, liquidation, dissolution or similar transaction, for consideration consisting of cash and/or securities, more than 25% of the combined voting power of the shares of ESSA common stock then outstanding or all or substantially all of the assets of ESSA and otherwise (i) on terms which the ESSA Board of Directors 164

determines in good faith, after consultation