Company: NWBI
Filing Date: 2025-02-20
Form Type: S-4/A
Source: 0001193125-25-030716
Chunk: 39

Company: Northwest Bancshares, Inc.
Filing Date: 2025-02-20
Form: S-4/A
Chunk 39
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 Related to Penns Woods’ Business

You should read and consider risk factors specific to Penns Woods’ business that will also affect the combined company after the Merger,
described in Penns Woods’ Annual Report on Form 10-K for the fiscal year ended December 31, 2023, as updated by subsequently filed Quarterly Reports on Form
10-Q and Current Reports on Form 8-K, all of which are filed by Penns Woods with the SEC and incorporated by reference into 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 February 18, 2025, the last practicable day for which information was available prior to the date of this proxy statement/prospectus.

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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 9:00 a.m., Eastern Daylight Time, on Tuesday, April 22, 2025, and accessed virtually at https://meetnow.global/MVDHGFG. 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