X0202 4 2008-02-26 0000091142 SMITH A O CORP AOS 0001310176 Petrarca Mark A A. O. SMITH CORPORATION 11270 WEST PARK PLACE MILWAUKEE WI 53224 0 1 0 0 Senior Vice Pres. - H.R. & P.A Common Stock 2008-02-26 4 S 0 .774 36.95 D 3227 D Column 5 of Table 1 includes 1.045 shares of Common Stock acquired through automatic reinvestment of quarterly dividends under the A. O. Smith Corporation Dividend Reinvestment Plan ("Plan"). On February 26, 2008, Mark Petrarca ended his participation in this Plan and the fractional shares were sold. James F. Stern, Attorney-in-Fact for Mark A. Petrarca 2008-02-27