|  |  |  |
|--|--|--|
|  |

|                                               |        |                         |        |                                  |  |  |  |  |  |  |  |  |  |  |
|-----------------------------------------------|--------|-------------------------|--------|----------------------------------|--|--|--|--|--|--|--|--|--|--|
| Delaware                                      |   | 1-475                   |   | 39-0619790                       |
| (State or other jurisdictionof incorporation) |   | (CommissionFile Number) |   | (IRS EmployerIdentification No.) |

|                                                                                                                                                                           |        |                                                                                                       |  |  |  |  |  |  |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-------------------------------------------------------------------------------------------------------|--|--|--|--|--|--|
|                                                                                                                                                                           |        |                                                                                                       |
| 11270 West Park Place, Milwaukee, Wisconsin                                                        (Address of principal executive offices)                               |   | 53224-9508                                                                                 (Zip Code) |
|                                                                                                                                                                           |        |                                                                                                       |
| Charles T. Lauber                                                                                                    Executive Vice President and Chief Financial Officer |   | (414) 359-4000                                                                                        |
| (Name and telephone number, including area code, of the person to contact in connection with this report)                                                                 |

|         |                                                                                                                              |  |  |  |  |
|---------|------------------------------------------------------------------------------------------------------------------------------|--|--|--|--|
| ☒ | Rule13p-1 under the Securities Exchange Act (17 CFR 240.13p-1) for the reporting period from January 1 to December 31, 2023. |

|  |  |  |
|--|--|--|
|  |

----

----

|                       |  |  |  |                         |  |                                                      |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|-----------------------|--|--|--|-------------------------|--|------------------------------------------------------|--|--|--|--|--|--|--|--|--|--|--|--|--|--|
|                       |  |  |  | A. O. SMITH CORPORATION |
|                       |  |  |  |
| Date: May 8, 2024 |  |  |  | By:                 |  | /s/Charles T. Lauber                         |
|                       |  |  |  |                         |  | Charles T. Lauber                                    |
|                       |  |  |  |                         |  | Executive Vice President and Chief Financial Officer |