Company: NWBI
Filing Date: 2025-06-27
Form Type: 11-K
Source: 0001471265-25-000120
Chunk: 0

Company: Northwest Bancshares, Inc.
Filing Date: 2025-06-27
Form: 11-K
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM 11-K
#### ý

Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934.

#### For the fiscal year ended December 31, 2024

#### OR

#### o
Transition Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934.

#### For the transition period from to

#### Commission File Number 001-34582
A. Full title of the plan and the address of the plan, if different from that of the issuer named below:

#### Northwest Bank 401(k) Plan

#### 100 Liberty Street

#### Warren, Pennsylvania 16365
B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:

#### Northwest Bancshares, Inc.

#### 3 Easton Oval Suite 500

#### Columbus, Ohio 43219

### FINANCIAL STATEMENTS AND EXHIBITS
The following financial statements and exhibits are filed as part of this annual report:

Exhibit 23 Consent of Independent Registered Public Accounting Firm

Exhibit 99 Financial Statements as of and for the years ended December 31, 2024 and 2023 and Supplemental

Schedule as of December 31, 2024 for the Northwest Bank 401(k) Plan.

### SIGNATURES
The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized.

| Date: |     | June 27, 2025 |     | By: |     | NORTHWEST BANK 401(k) PLAN                     
 /s/ Kyle P. Kane                               |
|:------|:----|:--------------|:----|:----|:----|:-----------------------------------------------|
|       |     |               |     |     |     | Kyle P. Kane                                   |
|       |     |               |     |     |     | Executive Vice President, Chief People Officer |