Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 230

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 230
---
) 765-9621, and in the case of ESSA shareholders, to Stephanie Lefferson, ESSA Bancorp, Inc., 200 Palmer Street, PO Box L, Stroudsburg, Pennsylvania 18360 or
call ESSA at (570) 422-0182 . If you own your shares in “street name,” please contact your broker, bank or other nominee to make your request.

WHERE YOU CAN FIND MORE INFORMATION

CNB and ESSA each file annual, quarterly and current reports, proxy statements and other information with the SEC. SEC filings are available to the public at
the SEC’s website at www.sec.gov.

CNB has filed a registration statement on Form S-4 to
register with the SEC the shares of CNB common stock that ESSA shareholders will receive in the merger. This joint proxy statement/prospectus is part of CNB’s registration statement on
Form S-4 and is a prospectus of CNB and a proxy statement of CNB and ESSA for their shareholder meetings.

The SEC permits CNB to “incorporate by reference” information into this joint proxy statement/prospectus. This means that CNB can disclose important
information to you by referring to another document filed separately with the SEC. The information incorporated by reference is considered a part of this joint proxy statement/prospectus, except for any information superseded by information
contained directly in this joint proxy statement/prospectus

186

or by information contained in documents filed with or furnished to the SEC after the date of this joint proxy statement/prospectus that is incorporated by reference into this joint proxy statement/prospectus. This joint proxy statement/prospectus incorporates by reference the CNB documents set forth below that have been previously filed with the SEC. These documents contain important information about CNB and its financial condition.

| CNB SEC Filings (SEC File Number                                                                                                                                      
 001-39472)                                                                                                                                                            
 Annual Report on Form 10-K                                                                                                                                            
 Proxy Statement on Schedule 14A                                                                                                                                       |     | Period or Date Filed                                                                        
 Year ended December 31, 2023, filed March 7, 2024                                           
 Filed March 8, 2024 (solely to the extent incorporated by reference into Part III of        
 the Annual Report on Form 10-K for the year ended December 31, 2023)                        |
|:----------------------------------------------------------------------------------------------------------------------------------------------------------------------|:----|:--------------------------------------------------------------------------------------------|
| Quarterly Reports on Form 10