Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 0

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 0
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Filed Pursuant to Rule 424(b)(3)
Registration No. 333-285096 PROSPECTUS

Joint Proxy Statement/Prospectus MERGER PROPOSED—YOUR VOTE IS VERY IMPORTANT Dear Shareholders of CNB Financial Corporation and ESSA Bancorp, Inc.: On January 9, 2025, CNB Financial Corporation (“CNB”), a Pennsylvania corporation, CNB Bank, a Pennsylvania-chartered nonmember bank and CNB’s wholly-owned subsidiary (“CNB Bank”), ESSA Bancorp, Inc., a Pennsylvania corporation (“ESSA”), and ESSA Bank & Trust, a Pennsylvania-chartered stock savings bank and ESSA’s wholly-owned subsidiary (“ESSA Bank”), entered into an Agreement and Plan of Merger (the “merger agreement”) pursuant to which (i) ESSA will merge with and into CNB, with CNB as the surviving entity, and (ii) ESSA Bank will merge with and into CNB Bank, with CNB Bank as the surviving entity. CNB and ESSA are each holding a meeting for their respective shareholders to vote on the proposals necessary to complete the merger. The annual meeting of CNB shareholders will be held virtually on April 15, 2025 at 2:00 p.m., Eastern time. The special meeting of ESSA shareholders will be held virtually on April 15, 2025 at 10:00 a.m., Eastern time. At the annual meeting of CNB shareholders, CNB shareholders will be asked to consider and vote on (i) a proposal to approve the issuance of shares of CNB common stock in connection with the merger on the terms and conditions set forth in the merger agreement (the “CNB share issuance proposal”), (ii) the election to the CNB Board of Directors of the three Class 2 directors set forth in the enclosed joint proxy statement/prospectus to serve until the 2028 annual meeting of CNB shareholders or until their respective successors are elected, (iii) a proposal to approve the CNB Financial Corporation 2025 Omnibus Incentive Plan (the “CNB incentive plan proposal”), (iv) a non-binding advisoryresolution to approve the compensation of CNB’s named executive officers (the “CNB say-on-payproposal”), (v) a proposal to ratify the appointment of Forvis Mazars, LLP as CNB’s independent registered public accounting firm for the fiscal year ending December 31, 2025 (the