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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1. Name and Address of Reporting Person * Martineau Peter R   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 _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Senior Vice President - CIO (Last) (First) (Middle) A. O. SMITH CORPORATION, 500 TENNESSEE WALTZ PARKWAY 3. Date of Earliest Transaction (Month/Day/Year) 10/31/2017 (Street) ASHLAND CITY, TN 37015 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 10/31/2017   M   4,400 A $ 11.493 17,528 D   Common Stock 10/31/2017   M   6,800 A $ 17.462 24,328 D   Common Stock 10/31/2017   M   5,140 A $ 23.235 29,468 D   Common Stock 10/31/2017   M   3,493 A $ 30.765 32,961 D   Common Stock 10/31/2017   M   2,434 A $ 31.67 35,395 D   Common Stock 10/31/2017   S   22,267 D $ 59.3294 13,128 D

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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

Employee Stock Options (Right to Buy)

$ 11.493

10/31/2017

M

4,400

(1)

02/13/2022

Common Stock

4,400

$ 0

29,540

D

Employee Stock Options (Right to Buy)

$ 17.462

10/31/2017

M

6,800

(2)

02/11/2023

Common Stock

6,800

$ 0

22,740

D

Employee Stock Options (Right to Buy)

$ 23.235

10/31/2017

M

5,140

(3)

02/10/2024

Common Stock

5,140

$ 0

17,600

D

Employee Stock Options (Right to Buy)

$ 30.765

10/31/2017

M

3,493

(4)

02/09/2025

Common Stock

3,493

$ 0

14,107

D

Employee Stock Options (Right to Buy)

$ 31.67

10/31/2017

M

2,434

(5)

02/08/2026

Common Stock

2,434

$ 0

11,673

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Martineau Peter R A. O. SMITH CORPORATION 500 TENNESSEE WALTZ PARKWAY ASHLAND CITY, TN 37015			Senior Vice President - CIO

Signatures

James F. Stern, Attorney-in-Fact for Peter R. Martineau		11/01/2017
**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)	The employee stock options were granted on 02/13/2012 under the A. O. Smith Combined Incentive Compensation Plan, a transaction exempt under Rule 16b-3. The options become exercisable in three annual installments of 1/3 of the award starting on 02/13/2013.
(2)	The employee stock options were granted on 02/11/2013 under the A. O. Smith Combined Incentive Compensation Plan, a transaction exempt under Rule 16b-3. The options become exercisable in three annual installments of 1/3 of the award starting on 02/11/2014.
(3)	The employee stock options were granted on 02/10/2014 under the A. O. Smith Combined Incentive Compensation Plan, a transaction exempt under Rule 16b-3. The options become exercisable in three annual installments of 1/3 of the award starting on 02/10/2015.
(4)	The employee stock options were granted on 02/09/2015 under the A. O. Smith Combined Incentive Compensation Plan, a transaction exempt under Rule 16b-3. The options become exercisable in three annual installments of 1/3 of the award starting on 02/09/2016.
(5)	The employee stock options were granted on 02/08/2016 under the A. O. Smith Combined Incentive Compensation Plan, a transaction exempt under Rule 16b-3. The options become exercisable in three annual installments of 1/3 of the award starting on 02/08/2017.

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