Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 8

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 8
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ianceAdvisors.com |     | Laurel Hill Advisory Group, LLC    
 2 Robbins Lane, Suite 201 Jericho, 
 New York 11753 (516) 933-3100      
 info@laurelhill.com                |

Please do not send your ESSA stock certificates at this time. You will be sent separate instructions regarding the surrender of your ESSA stock certificates.

ABOUT THIS DOCUMENT

This joint proxy statement/prospectus, which forms part of a registration statement on Form S-4 (Registration
Statement No. 333-285096) filed by CNB with the Securities and Exchange Commission (the “SEC”), constitutes a prospectus of CNB for purposes of the Securities Act of 1933, as amended (the
“Securities Act”), with respect to the CNB common stock to be issued to ESSA shareholders in exchange for shares of ESSA common stock pursuant to the merger agreement, as such agreement may be amended or modified from time to time. This
joint proxy statement/prospectus also constitutes a proxy statement for CNB and ESSA. In addition, it constitutes a notice of annual meeting with respect to the annual meeting of CNB shareholders and a notice of special meeting with respect to the
special meeting of ESSA shareholders.

You should rely only on the information contained or incorporated by reference in this joint proxy
statement/prospectus. No one has been authorized to provide you with information that is different from that contained in, or incorporated by reference into, this joint proxy statement/prospectus. This joint proxy statement/prospectus is dated
March 5, 2025, and you should not assume that the information contained in, or incorporated by reference into, this joint proxy statement/prospectus is accurate as of any date other than that date (or, in the case of documents incorporated by
reference, their respective dates). Neither the mailing of this joint proxy statement/prospectus to CNB shareholders or ESSA shareholders nor the issuance by CNB of shares of CNB common stock pursuant to the merger agreement will create any
implication to the contrary.

This joint proxy statement/prospectus does not constitute an offer to sell, or a solicitation of an offer to buy, any securities, or the solicitation of a proxy, in any jurisdiction in which or to any person to whom it is unlawful to make any such offer or solicitation in such jurisdiction. Information contained in this joint proxy statement/prospectus regarding CNB has