Company: NWBI
Filing Date: 2025-01-27
Form Type: S-4
Source: 0001193125-25-012768
Chunk: 39

Company: Northwest Bancshares, Inc.
Filing Date: 2025-01-27
Form: S-4
Chunk 39
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 this document. See “INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE” on page 89 of this proxy statement/prospectus.

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MARKET VALUE ON A HISTORICAL AND EQUIVALENT PER SHARE BASIS The information presented in the following table reflects the market value of Penns Woods’ common stock on a historical and equivalent per share basis and the market value of Northwest common stock on a historical basis as of the last trading day preceding the public announcement of the Merger, December 16, 2024, and January 22, 2025, the last practicable day for which information was available prior to the date of this proxy statement/prospectus.

24

THE SPECIAL MEETING OF SHAREHOLDERS OF PENNS WOODS Time, Date and Place This proxy statement/prospectus is being provided to Penns Woods shareholders in connection with the solicitation of proxies by the Penns Woods board of directors for use at the special meeting of shareholders to be held at , Eastern Daylight Time, on , 2025, and accessed virtually at . This proxy statement/prospectus is also being furnished by Northwest to Penns Woods shareholders as a prospectus in connection with the issuance of Northwest common stock upon completion of the Merger. Matters to be Considered At the Penns Woods Special Meeting, the shareholders of Penns Woods will be asked to consider and vote upon the following matters:

| • |     | a proposal to adopt and approve the Merger Agreement and the transactions contemplated thereby, including the 
 Merger;                                                                                                       |

| • |     | a proposal to approve, on an advisory (non-binding) basis, specified                                                   
 compensation that may become payable to the named executive officers of Penns Woods in connection with the Merger; and |

| • |     | a proposal to approve the adjournment of the special meeting, if necessary, to solicit additional proxies, in the  
 event there are not sufficient votes at the time of the special meeting to adopt and approve the Merger Agreement. |

The board of directors of Penns Woods believes that the Merger with Northwest is in the best interests of Penns Woods’ shareholders and recommends that you vote (1) “FOR”the adoption and approval of the Merger Agreement, (2) “FOR”the approval of the specified compensation, and (3) “FOR”the proposal to adjourn the special meeting of Penns Woods shareholders, if necessary, to solicit additional proxies. Record Date; Shares Outstanding and