Company: CCNE
Filing Date: 2025-03-05
Form Type: 424B3
Source: 0001193125-25-047258
Chunk: 358

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-03-05
Form: 424B3
Chunk 358
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 intents of this Agreement.

Section 9. . The covenants contained herein shall apply to Shareholder solely in his or her capacity as a
shareholder of CNB, and no covenant contained herein shall apply to Shareholder in his or her capacity as a director, officer or employee of CNB or in any other capacity. Nothing contained in this Agreement shall be deemed to apply to, or limit in
any manner, the obligations of Shareholder to comply with his or her fiduciary duties as a director or officer, as applicable, of CNB.

Section 10. . This Agreement shall be governed by, and interpreted in accordance with, the laws of Commonwealth of
Pennsylvania, without regard for conflict of law provisions.

Section 12. . All notices and other communications
hereunder shall be in writing and shall be deemed given if delivered personally or sent by overnight courier (providing proof of delivery) to ESSA in accordance with Section 8.06 of the Merger Agreement and to the Shareholder at his, her or its
address set forth on attached hereto (or at such other address for a party as shall be specified by like notice).

(Remainder of page intentionally left blank.)

IN WITNESS WHEREOF, the parties hereto have executed and delivered this Agreement as of the date first written above.

| ESSA BANCORP, INC. |
| By:                |
| Name:              |
| Title:             |
| SHAREHOLDER        |
| Name:              |

[Signature Page to Voting Agreement]

EXHIBIT A

| NAME AND ADDRESS 
 OF SHAREHOLDER   |     | SHARES OF CNB COMMON STOCK BENEFICIALLY OWNED |

ANNEX B

OPINION OF PIPER SANDLER & CO.

B-1

| 1251 AVENUE OF THE AMERICAS, 6TH FLOOR  NEW YORK, NY 10020 
 P 212 466-7800 | TF 800 635-6851                           
 Piper Sandler & Co. Since 1895.                            
 Member SIPC and NYSE.                                      |

January 9, 2024 Board of Directors CNB Financial Corporation 1 South Second Street P.O. Box 42 Clearfield, PA 16830 Ladies and Gentlemen: CNB Financial Corporation (“ CNB”), CNB Bank, a wholly-owned subsidiary of CNB (“ CNB Bank”), ESSA Bancorp, Inc. (“ ESSA”) and E