Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Smith Family Trusts
  2. Issuer Name and Ticker or Trading Symbol
SMITH A O CORP [AOS]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O SMITH INVESTMENT COMPANY, 11270 WEST PARK PLACE
3. Date of Earliest Transaction (Month/Day/Year)
04/22/2009
(Street)

MILWAUKEE, WI 53224
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock               4,734 D (1)  
Common Stock               2,649 I See Note (2)
Common Stock 04/22/2009   J(3)   91,141 D (3) 14,670 I See Note (4)
Common Stock 04/22/2009   D(5)   14,670 D (3) 0 I See Note (4)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Class A Common Stock (6) 04/22/2009   J(3)     471,597   (7)   (6) Common Stock 471,597 (8) 75,909 I See Note (9)
Class A Common Stock (6) 04/22/2009   D(5)     75,909   (7)   (6) Common Stock 75,909 (8) 0 I See Note (9)
Phantom Stock (6)               (10)   (10) Common Stock 10,413   10,413 D (11)  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Smith Family Trusts
C/O SMITH INVESTMENT COMPANY
11270 WEST PARK PLACE
MILWAUKEE, WI 53224
    X    

Signatures

 Bruce M. Smith as Representative for Smith Family Trusts   04/24/2009
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Shares held directly by one individual who was part of the Reporting Person until the Reporting Person disbanded upon consummation of the Merger described below.
(2) Represents the indirect ownership of the Issuer's Common Stock by one individual who was part of the Reporting Person under the A. O. Smith Corporation Directors' Deferred Compensation Plan (the "Plan").
(3) Represents the conversion of shares of SICO common stock into shares of Common Stock and Class A Common Stock of the Issuer pursuant to the merger of SICO with a subsidiary of the Issuer (the "Merger"). No consideration was paid or received except for the conversion of each SICO share into 0.463 shares of the Issuer's Common Stock and 2.396 shares of the Issuer's Class A Common Stock. Certain shares of the Issuer's Common Stock issued in the transaction are being held in escrow pursuant to the related merger agreement.
(4) Represented the Reporting Person's proportionate interest in shares of the Issuer's Common Stock held by SICO, including certain shares held in trust. Beneficial ownership of the shares of the Issuer owned by SICO is disclaimed.
(5) Represents a conversion in the Merger that was approved in advance by the Board of Directors of the Issuer on behalf of an individual who was part of the Reporting Person and is also a director of the Issuer.
(6) None.
(7) Convertible at any time.
(8) Convertible on a 1-for-1 basis.
(9) Represented the Reporting Person's proportionate interest in shares of the Issuer's Class A Common Stock held by SICO, including certain shares held in trust. Beneficial ownership of the shares of the Issuer owned by SICO is disclaimed.
(10) The Plan allows for the payment of a retainer in phantom stock and it also permits the participant/recipient to defer receipt of the award. One individual who was part of the Reporting Person made a deferral pursuant to the Plan.
(11) Represents direct ownership of the Issuer's phantom stock by one individual who was part of the Reporting Person.
 
Remarks:
The Smith Family Trusts (the "Reporting Person") consisted of certain former shareholders of Smith Investment Company, a Nevada corporation ("SICO"), that held shares of A. O. Smith Corporation (the "Issuer").  On April 22, 2009, SICO merged with a subsidiary of the Issuer; in that transaction, outstanding shares of SICO common stock were converted into shares of Common Stock and Class A Common Stock of the Issuer.  The shareholders that comprised the Reporting Person were certain individual members of the Smith family and trusts for the benefit of certain members of the Smith family.  On December 10, 2008, the Reporting Person filed a Schedule 13D/A related to the Issuer's Common Stock pursuant to Section 13(d) of the Securities Exchange Act of 1934 (the "Exchange Act").  The collective beneficial ownership of the Issuer's outstanding Common Stock under Rule 13d-3 under the Exchange Act exceeded 10% of the Issuer's Common Stock.  The Reporting Person disbanded as a group upon consummation of the Merger.  The Reporting Person disclaims beneficial ownership of the shares of the Issuer's Common Stock held by SICO and also disclaims that the Reporting Person constituted a "group" pursuant to Section 13(d).

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