Company: CCNE
Filing Date: 2025-01-10
Form Type: 425
Source: 0001193125-25-004105
Chunk: 0

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-01-10
Form: 425
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 9, 2025 CNB FINANCIAL CORPORATION (Exact name of Registrant as Specified in Its Charter)

| Pennsylvania                 |     | 001-39472   |     | 25-1450605         |
| (State or Other Jurisdiction 
 of Incorporation)            |     | -Commission 
 File Number |     | -IRS Employer      
 Identification No. |

| 1 South Second Street                    
 PO Box 42 Clearfield,                    
 Pennsylvania                             |     |     16830 |
| (Address of principal executive offices) |     | -Zip code |

Registrant’s Telephone Number, Including Area Code: (814) 765-9621 Not Applicable (Former Name or Former Address, if Changed Since Last Report) Check the appropriate box below if the Form 8-Kfiling is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instructions A.2. below):

| ☒ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |

| ☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 
 CFR 240.14a-12)                                                        |

| ☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |

| ☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

Securities registered pursuant to Section 12(b) of the Act:

| Title of each class                                                                                                     |     | Trading symbol |     | Name of each exchange       
 on which registered         |
| Common Stock, no par value                                                                                              |     | CCNE           |     | The NASDAQ Stock Market LLC |
| Depositary Shares (each representing a 1/40th interest in a share of 7.25% Series A Non-Cumulative, Perpetual Preferred 
 Stock)                                                                                                                  |     | CCNEP          |     | The NASDAQ Stock Market LLC |

Indicate by check mark whether the registrant is an