SMITH A O CORP — Director's Dealing 2011

Feb 10, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: SMITH A O CORP (AOS)
CIK: 0000091142
Period of Report: 2011-02-09

Reporting Person: MAPES CHRISTOPHER L (Executive Vice President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-02-09	Common Stock	M	46350	$15.987	Acquired	80290	Direct
2011-02-09	Common Stock	S	400	$41.56	Disposed	79890	Direct
2011-02-09	Common Stock	S	2200	$41.57	Disposed	77690	Direct
2011-02-09	Common Stock	S	1400	$41.58	Disposed	76290	Direct
2011-02-09	Common Stock	S	1900	$41.59	Disposed	74390	Direct
2011-02-09	Common Stock	S	2322	$41.60	Disposed	72068	Direct
2011-02-09	Common Stock	S	6093	$41.61	Disposed	65975	Direct
2011-02-09	Common Stock	S	3100	$41.62	Disposed	62875	Direct
2011-02-09	Common Stock	S	3428	$41.63	Disposed	59447	Direct
2011-02-09	Common Stock	S	1900	$41.64	Disposed	57547	Direct
2011-02-09	Common Stock	S	3000	$41.65	Disposed	54547	Direct
2011-02-09	Common Stock	S	1700	$41.66	Disposed	52847	Direct
2011-02-09	Common Stock	S	1200	$41.67	Disposed	51647	Direct
2011-02-09	Common Stock	S	100	$41.68	Disposed	51547	Direct
2011-02-09	Common Stock	S	100	$41.69	Disposed	51447	Direct
2011-02-09	Common Stock	S	2300	$41.70	Disposed	49147	Direct
2011-02-09	Common Stock	S	800	$41.71	Disposed	48347	Direct
2011-02-09	Common Stock	S	100	$41.72	Disposed	48247	Direct
2011-02-09	Common Stock	S	100	$41.74	Disposed	48147	Direct
2011-02-09	Common Stock	S	500	$41.75	Disposed	47647	Direct
2011-02-09	Common Stock	S	100	$41.76	Disposed	47547	Direct
2011-02-09	Common Stock	S	500	$41.77	Disposed	47047	Direct
2011-02-09	Common Stock	S	567	$41.78	Disposed	46480	Direct
2011-02-09	Common Stock	S	900	$41.79	Disposed	45580	Direct
2011-02-09	Common Stock	S	6200	$41.80	Disposed	39380	Direct
2011-02-09	Common Stock	S	100	$41.805	Disposed	39280	Direct
2011-02-09	Common Stock	S	2100	$41.81	Disposed	37180	Direct
2011-02-09	Common Stock	S	500	$41.82	Disposed	36680	Direct
2011-02-09	Common Stock	S	533	$41.83	Disposed	36147	Direct
2011-02-09	Common Stock	S	1407	$41.84	Disposed	34740	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-02-09	Employee Stock Options (Right to Buy)	$15.987	M	46350	Disposed	2014-09-22	Common Stock (46350)	Direct

Footnotes

F1: The employee stock options were granted on 09/22/2004, under the A. O. Smith Combined Executive Incentive Compensation Plan, a transaction exempt under rule 16b-3. The options became exercisable in three annual installments of 1/3 of the award starting on 09/22/2005.