Company: AOS
Filing Date: 2025-06-30
Form Type: 11-K
Source: 0000091142-25-000086
Chunk: 0

Company: SMITH A O CORP
Filing Date: 2025-06-30
Form: 11-K
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM 11-K
(Mark One)

☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

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

#### OR
☐ TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

#### For the transition period from __________

#### to
#### __________

#### Commission file number 1-475
A. Full title of the plan and the address of the plan, if different from that of the issuer named below:

#### A. O. Smith Retirement Security Plan
B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:

#### A. O. Smith Corporation

#### 11270 West Park Place

#### Milwaukee, WI 53224
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REQUIRED INFORMATION</div>

1. Not Applicable.

2. Not Applicable.

3. Not Applicable.

4. The A. O. Smith Retirement Security Plan (the “Plan”) is subject to the requirements of the Employee Retirement Income Security Act of 1974 (“ERISA”). Attached hereto is a copy of the most recent financial statements and schedules of the Plan prepared in accordance with the financial reporting requirements of ERISA.

Signature

Exhibits

23.1 Consent of Independent Auditors

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#### A. O. SMITH

### RETIREMENT SECURITY PLAN

#### Milwaukee, Wisconsin

### AUDITED FINANCIAL STATEMENTS

#### Years Ended December 31, 2024 and 2023

### TABLE OF CONTENTS
|                                                            |     | Page (s) |     |        |
| Report of Independent Registered Public Accounting Firm    |     |          |     |      4 |
| Statements of Net Assets Available for Benefits            |     |          |     |      5 |
| Statements of Changes in Net Assets Available for Benefits |     |          |     |      6 |
| Notes to Financial Statements                              |     |          |     | 7 - 13 |
| Schedule of Assets (Held at End of Year)                   |     |          |     |  14-15 |

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Report of Independent Registered Public