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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
91142	Smith A O Corp	AOS	Motors & Generators (3621)	390619790

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1310176	A Mark Petrarca	A. O. Smith Corporation 11270 West Park Place Milwaukee WI 53224	Senior Vice Pres. - H.r. & P.a	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2011-02-11	4,650	$42.22	22,434	No	4	M	Direct
Common Stock	Disposition	2011-02-11	1,909	$42.22	20,525	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Units	Disposition	2011-02-11	4,650	$0.00	4,650	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
13,200			No	4	M	Direct

Footnotes

4,650 Restricted Stock Units were granted on 02/11/2008, under the A. O. Smith Combined Incentive Compensation Plan, a transaction excempt under Rule 16b-3. 4,650 Restricted Stock Units vested on 02/11/2011. As of result of vesting, the Company is obligated to deliver 4,650 shares of Common Stock to the reporting person.
The reporting person sold these shares to obtain funds to pay the withholding taxes due as a result of the vesting of the restricted stock units described in footnote (1).