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: MARTIN LOIS M CIK: 0001282708 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-04-13 | Code: A (Grant or award) Shares: +2,262 | Price: $66.32 Total Value: $150,015.84 Shares Owned After: 6,445 | Ownership: D (Direct) Footnotes: [F1] Payment of retainer in stock under the A. O. Smith Corporation directors' compensation program based on the average of the high and low price of Common Stock on April 13, 2026. [F2] Ms. Martin is a participant in the A. O. Smith Dividend Reinvestment Plan ('Plan") and receives a quarterly dividend pursuant to the Plan. The total amount of dividends received was 89 shares of Common Stock. --- Footnotes (Complete Index) --- F1: Payment of retainer in stock under the A. O. Smith Corporation directors' compensation program based on the average of the high and low price of Common Stock on April 13, 2026. F2: Ms. Martin is a participant in the A. O. Smith Dividend Reinvestment Plan ('Plan") and receives a quarterly dividend pursuant to the Plan. The total amount of dividends received was 89 shares of Common Stock. --- Signature --- /s/ James F. Stern, Attorney-in-Fact for Lois M. Martin (2026-04-15)