X0306 4 2013-04-15 0000091142 SMITH A O CORP AOS 0001244813 GREUBEL WILLIAM P A. O. SMITH CORPORATION 11270 WEST PARK PLACE MILWAUKEE WI 53224 1 0 0 0 Restricted Stock Units 68.375 2013-04-15 4 A 0 1375 0 A Common Stock 1375 21099 D Payment of portion of retainer in Restricted Stock Units under the A. O. Smith Nonqualified Deferred Compensation Plan based on the market price of the Common Stock on April 15, 2013. The Plan permits the participant to defer the receipt of the award, and Mr. Greubel has made a deferral. The Restricted Stock Units receive a quarterly dividend pursuant to a dividend reinvestment feature of the A. O. Smith Nonqualfied Deferred Compensation Plan. The total amount of dividends received was 199 units of Restricted Stock Units. James F. Stern, Attorney-in-Fact for William P. Greubel 2013-04-16