Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 63

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 63
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 broker,
trustee or other nominee with this joint proxy statement/prospectus. The CNB auditor ratification proposal is considered a “routine” proposal and, as such, your broker, bank, trustee or other nominee is entitled to vote on the CNB auditor
ratification proposal without your instructions.

Accordingly, you are urged to mark and return the enclosed proxy card to indicate your vote, or fill out
the voter instruction form, if applicable.

Abstentions and broker non-votes will be counted for purposes of
determining whether a quorum is present at the annual meeting. Abstentions and broker-non votes will have no effect on any of the proposals.

Proxy Solicitation

If you are
a CNB shareholder, the enclosed proxy is solicited by and on behalf of the CNB Board of Directors. CNB will pay the expenses of soliciting proxies to be voted at the annual meeting, including any attorneys’ and accountants’ fees, except
CNB and ESSA have each agreed to share equally the costs of filing, printing and mailing this joint proxy statement/prospectus. Following the original mailing of the proxies and other soliciting materials, CNB and its agents may also solicit proxies
by mail, telephone, facsimile or in person. No additional compensation will be paid to directors, officers or other employees of CNB for making these solicitations.

CNB has retained a proxy solicitation firm, Alliance Advisors, LLC, to aid it in the solicitation process. CNB estimates it will pay Alliance Advisors, LLC a
fee of approximately $25,000 plus certain expenses and has agreed to indemnify Alliance Advisors, LLC against certain losses. CNB intends to reimburse persons who hold CNB common stock of record but not beneficially, such as brokers, custodians,
nominees and fiduciaries, for their reasonable expenses in forwarding copies of proxies and other soliciting materials to, and requesting authority for the exercise of proxies from, the persons for whom they hold the shares.

This joint proxy statement/prospectus and the proxy card are first being sent to CNB shareholders on or about March 7, 2025.

37

CNB PROPOSAL 1 – THE SHARE ISSUANCE PROPOSAL

CNB shareholders are being asked to consider and vote on 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, a copy of which is attached as