Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 5

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 5
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 shares that you own. Please vote by internet, by telephone, or by completing and mailing the enclosed proxy card promptly in the enclosed postage-paid envelope.Voting by proxy will not prevent you from voting
online during the annual meeting but will assure that your vote is counted if you are unable to attend. You may revoke your proxy at any time before the meeting. If your shares are held in the name of a bank, broker, trustee or other nominee, please
follow the instructions furnished to you by such record holder with these materials.

The CNB Board of Directors unanimously recommends that all CNB shareholders vote “FOR” the CNB share issuance proposal, “FOR” each of the three CNB director nominees, “FOR” the CNB incentive plan proposal, “FOR” the CNB say-on-payproposal, “FOR” the CNB auditor ratification proposal and “FOR” the CNB adjournment proposal.

By Order of the Board of Directors,

Anna K. “Katie” Andersen

Secretary

Clearfield, Pennsylvania

March 5, 2025

200 Palmer Street Stroudsburg, Pennsylvania 18360 (570) 422-0182 NOTICE OF SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON APRIL 15, 2025 A special meeting of shareholders of ESSA Bancorp, Inc. (“ESSA”) will be held virtually on April 15, 2025, at 10:00 a.m., Eastern time, to consider and vote on the following matters:

| 2. | a proposal to approve, on an advisory (non-binding) basis, specified                                                                               
 compensation that may become payable to the named executive officers of ESSA in connection with the merger (the “ESSA compensation proposal”); and |

| 3. | a proposal to approve one or more adjournments of the ESSA special meeting, if necessary, to permit further                                                                                                              
 solicitation of proxies if there are insufficient votes at the time of the special meeting, or at an adjournment or postponement of that meeting, to approve the ESSA merger proposal (the “ESSA adjournment proposal”). |

The merger agreement and proposed merger are more fully described in the attached joint proxy statement/prospectus, which you should read carefully and in its entirety before voting. A copy of the merger agreement is included as Annex Ato the attached joint proxy statement/prospectus. You may access the special meeting by visiting https://www.meetnow.global