Company: CCNE
Filing Date: 2025-03-03
Form Type: S-4/A
Source: 0001193125-25-044149
Chunk: 1

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-03
Form: S-4/A
Chunk 1
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 Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐ Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer,a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 ofthe Exchange Act.

| Large accelerated filer |     | ☐ |     | Accelerated filer         |     | ☒ |
| Non-accelerated filer   |     | ☐ |     | Smaller reporting company |     | ☐ |
|                         |     |   |     | Emerging growth company   |     | ☐ |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐ If applicable, place an X in the box to designate the appropriate rule provision relied upon in conducting this transaction:

| Exchange Act Rule13e-4(i)(Cross-Border Issuer Tender Offer) |     | ☐ |
| 14d-1(d)                                                    |     | ☐ |

The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the registration statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine.

The information in this joint proxy statement/prospectus is not complete and may be changed. We may not sell the securities offered by this joint proxy statement/prospectus until the registration statement filed with the Securities and Exchange Commission is effective. This joint proxy statement/prospectus does not constitute an offer to sell or a solicitation of an offer to buy any securities in any jurisdiction where an offer, solicitation or sale is not permitted.

PRELIMINARY—SUBJECT TO COMPLETION—DATED MARCH 3, 2025

Joint Proxy Statement/Prospectus MERGER PROPOSED—YOUR VOTE IS VERY IMPORTANT Dear Shareholders of CNB