Company: NWBI
Filing Date: 2025-02-20
Form Type: S-4/A
Source: 0001193125-25-030716
Chunk: 226

Company: Northwest Bancshares, Inc.
Filing Date: 2025-02-20
Form: S-4/A
Chunk 226
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5.12 . This Agreement and any signed agreement or instrument entered into in connection with this Agreement, and any amendments or waivers hereto or thereto, to the extent signed and delivered by means of a facsimile
machine or by email delivery of a “.pdf” format data file, shall be treated in all manner and respects as an original agreement or instrument and shall be considered to have the same binding legal effect as if it were the original signed
version thereof delivered in person. No party hereto or to any agreement or instrument entered into in connection with this Agreement shall raise the use of a facsimile machine or email delivery of a “.pdf” format data file to
deliver a signature to this Agreement or any amendment hereto or the fact that any signature or agreement or instrument was transmitted or communicated through the use of a facsimile machine or email delivery of a “.pdf” format data file
as a defense to the formation of a contract and each party hereto forever waives any defense based on the foregoing.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

A-69

SUPPORT AGREEMENT Signature Page IN WITNESS WHEREOF,the parties have caused this Agreement to be duly executed on the day first written above.

| SHAREHOLDER          |     |     |     | NORTHWEST BANCSHARES, INC.            |
|                      |     | By: |     |                                       |
| Name:                |     |     |     | Louis J. Torchio, President and CEO   |
| SHAREHOLDER’S SPOUSE |     |     |     | PENNS WOODS BANCORP, INC.             |
|                      |     | By: |     |                                       |
| Name:                |     |     |     | Richard A. Grafmyre, CEO and Director |

A-70

Attachment A

| Shareholder |     | Address and Email |     | Owned Shares |

A-71

Exhibit B

Form of Luzerne Bank Merger Agreement

See attached.

A-72

AGREEMENT AND PLAN OF MERGER

BY AND BETWEEN

NORTHWEST BANK

AND

LUZERNE BANK

This is an
Agreement and Plan of Bank Merger (this “”) dated as of , 2024, by and between Northwest Bank, a Pennsylvania-charted savings bank, being located in Warren, county of Warren, in the
Commonwealth of Pennsylvania (“”), and Luzerne Bank, a Pennsylvania-char