SMITH A O CORP (AOS) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-04-13 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: SMITH A O CORP (AOS) CIK: 0000091142 --- Reporting Owner --- Name: Larsen Michael M CIK: 0001503349 Role: Director --- Derivative Transactions --- [Transaction #1] Security: Restricted Stock Units Date: 2026-04-13 | Code: A (Grant or award) Shares: +2,262 | Price: $66.32 Shares Owned After: 13,284 | Ownership: D (Direct) Footnotes: [F1] Payment of retainer in Restricted Stock Units under the A. O. Smith Nonqualified Deferred Compensation Plan based on the average of the high and the low price of Common Stock on April 13, 2026. [F2] The Plan permits the participant to defer the receipt of the award, and Mr. Larsen has made a deferral. [F2] The Plan permits the participant to defer the receipt of the award, and Mr. Larsen has made a deferral. [F3] The Restricted Stock Units receive a quarterly dividend pursuant to a dividend reinvestment feature of the A. O. Smith Nonqualified Deferred Compensation Plan. The total amount of the dividends received was 215 units of Restricted Stock Units. --- Holdings --- [Holding #1] Security: Common Stock Ownership: D (Direct) --- Footnotes (Complete Index) --- F1: Payment of retainer in Restricted Stock Units under the A. O. Smith Nonqualified Deferred Compensation Plan based on the average of the high and the low price of Common Stock on April 13, 2026. F2: The Plan permits the participant to defer the receipt of the award, and Mr. Larsen has made a deferral. F3: The Restricted Stock Units receive a quarterly dividend pursuant to a dividend reinvestment feature of the A. O. Smith Nonqualified Deferred Compensation Plan. The total amount of the dividends received was 215 units of Restricted Stock Units. --- Signature --- /s/ James F. Stern, Attorney-in-Fact for Michael M. Larsen (2026-04-15)