Company: NWBI
Filing Date: 2025-02-24
Form Type: 424B3
Source: 0001193125-25-033488
Chunk: 12

Company: Northwest Bancshares, Inc.
Filing Date: 2025-02-24
Form: 424B3
Chunk 12
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 common stock) with                                                                                                                                           
 instructions on how to vote your common stock. Please follow the voting instructions provided by your broker, bank or nominee. If you do not provide voting instructions to your broker, bank or nominee, then your common stock will not 
 be voted by your broker, bank or nominee.                                                                                                                                                                                                 |

Assuming a quorum is present, if you are a Penns Woods shareholder and you do not instruct your broker, bank or other nominee on how to vote your shares, your broker, bank or other nominee may not vote your shares on the proposal to approve the Merger, which broker non-votewill not constitute or be counted as a vote cast and, consequently, will have no effect on the proposal to approve the Merger, the specified compensation or the adjournment of Penns Woods’ special meeting, if necessary, to solicit additional proxies. Under the rules of Nasdaq, brokers who hold shares in “street name” for a beneficial owner of those shares typically have the authority to vote in their discretion on “routine” proposals when they have not received instructions from beneficial owners. However, brokers are not allowed to exercise their voting discretion with respect to the approval of matters that Nasdaq determines to be “non-routine”without specific instructions from the beneficial owner. It is expected that all proposals to be voted on at the Penns Woods Special Meeting are such “non-routine”matters. Broker non-votesoccur when a broker or nominee is not instructed by the beneficial owner of shares to vote on a particular proposal for which the broker does not have discretionary voting power. Q: Can I change my vote after I have submitted my proxy?

| A: | You may revoke a proxy at any time before a vote is taken at the special meeting by: (i) filing a written                                                                                                                                          
 notice of revocation with Penns Woods’ Corporate Secretary, at 300 Market Street, P.O. Box 967, Williamsport, Pennsylvania 17703-0967, which must be received no later than April 21, 2025; (ii) executing and returning another proxy card with a 
 later date – only your latest completed, signed and dated proxy card received prior to April 21, 2025, will be counted; or (iii) attending the special meeting virtually and voting again at the special meeting.                                  |

5

Your attendance at the special meeting will not, by itself, revoke your proxy. If you hold your shares in “street name” and you have